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Articoli di riviste sul tema "Zirconia"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Norsham, Nur Fatinhanani Fatimah, and Istikamah Subuki. "Synthetization and Characterization of Yttria Stabilized Zirconia Powder from Amang Zircon Sand." Journal of Advanced Research in Micro and Nano Engineering 28, no. 1 (2024): 105–17. https://doi.org/10.37934/armne.28.1.105117.

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Abstract (sommario):

Zirconia is widely used in industry as it exhibits high strength and amazing properties. However, pure zirconia powder is often unstable to be used in high temperature applications due to phase transformation that will lead to fracture and crack. Hence, zirconia is doped with yttrium oxide in order to enhance zirconium content and stability as it helps to hinder the phase transformation of zirconia. Locally available Amang zircon sand from tin tailing industry in Malaysia can be an economical alternative to synthesize zirconia due to the high zirconium content. Sadly, the study on utilizing Am

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2

Karlina, Elin, Nina Djustiana, I. Made Joni, Renny Febrida, Camellia Panatarani, and Akhyar Dyni Zakyah. "Analisis Mikrostruktur Partikel Zirkoniakalsia-silika (ZrO 2 -CaO-SiO ) Dari Pasir Zirkon Alam Indonesia Menggunakan Metode Spray Pyrolysis." Jurnal Material Kedokteran Gigi 6, no. 1 (2017): 23. http://dx.doi.org/10.32793/jmkg.v6i1.261.

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Indonesian Natural Sand, Zircon, is an Indonesia’s natural resource that contains zirconia, silica, titania and alumina. In Dentistry, zirconia as one of the content in natural zircon sand, have the potential to be the material for filler composites. The purpose of this research was to analyze the Zirconia-Calcium-Silicate Particle (ZrO2CaO-SiO2) synthesized from Indonesia natural sand, zircon, in microstructural way. Methods: By synthesizing ZirconiaCalcium-Silicate particle (ZrO2-CaO-SiO2) from Indonesia natural zircon sand, using spray pyrolysis method. A precursor solution that is used con

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3

Li, Bing Qiang, Yao Shu, Wen Bin Dai, and Jing Kun Yu. "Effect of Zirconia, Zirconite and Zircon Mullite Additives on the Properties of Alumina Castable." Applied Mechanics and Materials 151 (January 2012): 346–49. http://dx.doi.org/10.4028/www.scientific.net/amm.151.346.

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The effect of the zirconia, zirconite, and zircon mullite additives on the properties of alumina-spinel castable has been investigated in present work. Results showed that the density of castables calcined at 110oC with the addition of zirconia and zirconite was higher than that of zircon mullite. With the increasing amount of additives, the densities of castables added with zirconia and zirconite were increased and that added with zircon mullite had not obviously difference. The apparent porosities of castables heated at 1600oC for 1h were about twice of those calcined at 110oC. The bulk dens

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4

Stankovic, Jovan, Slobodan Milonjic, and Slavica Zec. "The influence of chemical and thermal treatment on the point of zero charge of hydrous zirconium oxide." Journal of the Serbian Chemical Society 78, no. 7 (2013): 987–95. http://dx.doi.org/10.2298/jsc121010149s.

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Two zirconia samples were prepared by precipitation from aqueous zirconium oxychloride and zirconil sulphate solutions with potassium hydroxide. The prepared zirconia samples were amorphous. The pHpzc values of zirconia samples, determined from NaCl and NaNO3 solutions, were 6.6 ? 0.1 and 6.9 ? 0.1, respectively. After prolonged hydration of zirconia in doubly distilled water, pHpzc decreased to 4.7 ? 0.3. Crystallization into tetragonal (metastable) + monoclinic zirconia appeared at 691 K. Above 873 K, tetragonal metastable phase changes to monoclinic one. It was shown that crystallite sizes

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5

Meor Sulaiman, Meor Yusoff, Khaironie Mohamed Takip, and Ahmad Khairulikram Zahari. "In Situ XRD Study of Zirconia Phase Transformation Produced from Chemical and Mineral Processes." Materials Science Forum 840 (January 2016): 375–80. http://dx.doi.org/10.4028/www.scientific.net/msf.840.375.

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The high temperature phase transition of zirconia produced from commercial zirconyl chloride chemical was compared with that produced from a Malaysian zircon mineral. Zirconyl chloride was produced from zircon by using the hydrothermal fusion method. Initial XRD diffractogram of these samples at room temperature show that they are of amorphous structure. High temperature XRD studies was then performed on these samples; heated up to 1500°C. The XRD diffractograms shows that the crystalline structure of tetragonal zirconia was first observed and the monoclinic zirconia becomes more visible at hi

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6

Nur Fatinhanani Fatimah Norsham and Istikamah Subuki. "Effect of Temperature on Zirconia Powder Synthesized from Amang Zirconium Oxychloride Precursor." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 118, no. 1 (2024): 185–95. http://dx.doi.org/10.37934/arfmts.118.1.185195.

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Polymorphic zirconia is economically attractive in various applications due to its low reactivity, high strength, and stability. Zirconia can be synthesized from locally available Amang zircon sand as an inexpensive green alternative as it has a high zirconium content as reported by previous report. Unfortunately, the study was only focused on the formation of zirconium oxychloride despite of high zirconium content from the improved alkali fusion method proposed. Therefore, a further study on zirconia powder calcined in varied temperatures from Amang zirconium oxychloride precursor was done. A

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7

Yashima, Masatomo, Taka-aki Kato, Masato Kakihana, Mehmet Ali Gulgun, Yohtaro Matsuo, and Masahiro Yoshimura. "Crystallization of hafnia and zirconia during the pyrolysis of acetate gels." Journal of Materials Research 12, no. 10 (1997): 2575–83. http://dx.doi.org/10.1557/jmr.1997.0342.

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Hafnia and zirconia gels were prepared by drying hafnyl or zirconyl acetate solutions. Hafnia and zirconia gels contain both hydroxyl group and bidentate acetates which are directly bonded to the metal ions. Thermal decomposition and crystallization behavior of the gels were investigated through XRD, FT-IR, and TEM. Hafnium-containing gels crystallized directly into stable monoclinic hafnia around 500–540 °C, while zirconium-containing gels first formed metastable tetragonal zirconia around 450 °C. The dissimilar crystallization behavior of the gels into metastable, tetragonal zirconia or into

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8

Subuki, Istikamah. "Influence on Ratio of NaOH/ZrSiO4 in Alkali Fusion for Amang Zircon Sand." ASM Science Journal 17 (November 25, 2022): 1–10. http://dx.doi.org/10.32802/asmscj.2022.1093.

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Amang Zircon Sand from Amang Onn Sdn. Bhd. mineral company has a high composition of zirconium at 61.63 wt% and low silicon composition at 4.90 wt%. The high composition of zirconium in Amang zircon sand indicates the possibility to synthesise it into a zirconia. Zirconium was synthesised using alkali fusion method with different ratio of NaOH/ZrSiO4 to determine the optimum ratio based on the zirconium yield. Alkali fusion method is coupled with thermal treatment as it will produce a higher yield of zirconium with lower impurities. Then it will be leached with deionised water and hydrochloric

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9

Djustiana, Nina, Renny Febrida, Camellia Panatarani, Yuliafanny Imarundha, Elin Karlina, and I. Made Joni. "Microstructure Analysis of Zirconia-Alumina-Silica Particles Made from Indonesia Natural Sand Synthesized Using Spray Pyrolysis Method." Key Engineering Materials 720 (November 2016): 285–89. http://dx.doi.org/10.4028/www.scientific.net/kem.720.285.

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Zircon sand is one of Indonesian natural resource that is potential to be used as composite filler. Natural zircon sand can be found in several places in Indonesia, i.e. Riau Islands, Bangka-Belitung, and the Borneo. Zircon sand contains zirconia compound; while ZrO2 is the oxide crystal of zirconia compound. The mechanical and esthetical supremacy of zirconia is the reason why the usage of zirconia as nanocomposite filler mixed with alumina and silica increases. Spray pyrolysis method was used to synthesized natural zircon sand of Indonesia with temperature variety of 400°C, 500°C and 600°C.

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10

He, Yong Wu, Rui Sheng Wang, Jing Long Bu, Jun Xing Chen, and Zhi Fa Wang. "A Study on Crystallization of Fused Silica/Zirconia Ceramic Composites." Advanced Materials Research 652-654 (January 2013): 286–89. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.286.

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Fused silica particles and zirconyl chloride were used as main raw material. Meanwhile, ammonia was used as precipitator and polyethylene glycol as dispersant. Firstly, the composite powders were prepared by wet chemical synthesis. Then, fused silica/zirconia ceramic composites containing zirconia with different contents (5%, 15%, 25%, 35% and 45%) were fabricated in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1 h. The thermal expansion ratios and XRD of samples were examined. The analysis of XRD indicated that the cristobalite peaks intensity of sample with more zirconia is lower at

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11

Yamagata, Chieko, João B. Andrade, Valter Ussui, Nelson Batista de Lima, and José Octavio Armani Paschoal. "High Purity Zirconia and Silica Powders via Wet Process: Alkali Fusion of Zircon Sand." Materials Science Forum 591-593 (August 2008): 771–76. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.771.

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Zircon sand was reacted with liquid caustic soda (50% NaOH) in open vessel at 600 oC for 2h. The effect of NaOH/ZrSiO4 reactant ratio on the yield of zirconia recovery was verified. Samples of fusion products water washed were characterized by X-ray diffraction (XRD) to identify the main compounds formed. Silica powders were obtained via acid catalyzed reaction and zirconia powders were resulted from crystallization of zirconium oxychoride. Both zirconia and silica powders were analyzed by XRF (X-ray fluorescence) and BET method. Laser Quasi Elastic Light Scattering (QLS) technique was used fo

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12

Faza, Yanwar, and Renny Febrida. "SYNTHESIS AND CHARACTERIZATION OF MULLITE-ZIRCONIA NANO PARTICLES BY SOL-GEL METHOD AS FILLER OF DENTAL COMPOSITE." B-Dent: Jurnal Kedokteran Gigi Universitas Baiturrahmah 11, no. 1 (2024): 96–101. http://dx.doi.org/10.33854/jbd.v11i1.1611.

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Background. Currently, researchers are working on the development of dental composite fillers that are composed of a combination of two or more inorganic materials. Objective. The study aims to synthesis mullite-zirconia using the sol-gel method and observe the influence of zirconia on the particle characteristics of the filler including the size of the diameter, distribution and charge of the filler. Methods. The design of this study is descriptive explorative. The study consisted of four sample groups: 100% mullite (M); 85% Muliite - 15% zirconia (MZ15); 80% Mullite - 20% circonia(MZ20); 75%

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13

Ciszyński, Michał, Bartosz Chwaliszewski, Wojciech Simka, Marzena Dominiak, Tomasz Gedrange, and Jakub Hadzik. "Zirconia Dental Implant Designs and Surface Modifications: A Narrative Review." Materials 17, no. 17 (2024): 4202. http://dx.doi.org/10.3390/ma17174202.

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Titanium currently has a well-established position as the gold standard for manufacturing dental implants; however, it is not free of flaws. Mentions of possible soft-tissue discoloration, corrosion, and possible allergic reactions have led to the development of zirconia dental implants. Various techniques for the surface modification of titanium have been applied to increase titanium implants’ ability to osseointegrate. Similarly, to achieve the best possible results, zirconia dental implants have also had their surface modified to promote proper healing and satisfactory long-term results. De

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14

Subuki, Istikamah, Mimi Fazzlinda Mohsin, Muhammad Hussain Ismail, and Fazira Suriani Mohamed Fadzil. "Study of the Synthesis of Zirconia Powder from Zircon Sand obtained from Zircon Minerals Malaysia by Caustic Fusion Method." Indonesian Journal of Chemistry 20, no. 4 (2020): 782. http://dx.doi.org/10.22146/ijc.43936.

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The zircon powder from Zircon Minerals Malaysia is a pure premium grade zircon sand milled 1.5 µm that contain ZrSiO4, ZrO2, HfO2, SiO2, Al2O3, TiO2, and Fe2O3. The monoclinic zirconia powders were synthesized from the zircon sand of Zircon Minerals Malaysia, by caustic fusion method at calcination temperatures between 500 °C to 800 °C. The as-synthesized zirconia was characterized through X-Ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric and differential thermal analysis (TG-DTA), and X-Ray fluorescence (XRF) techniques. The XRD results show two monoclinic phases

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15

Fonseca, Elias, Monteiro, Santos, and Santos. "Modeling of the Influence of Chemical Composition, Sintering Temperature, Density, and Thickness in the Light Transmittance of Four Zirconia Dental Prostheses." Materials 12, no. 16 (2019): 2529. http://dx.doi.org/10.3390/ma12162529.

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Research has increasingly been conducted to improve the toughness and aesthetics of zirconium oxide (zirconia) used in prosthetic dentistry. However, the balance between better mechanical properties and greater translucency, to ensure aesthetic requirements, is still a challenge in the development of a novel zirconia for dentistry applications. This study evaluated the transmittance of visible light for four types of pre-sintered zirconia blocks used in dentistry (3Y-SBE, Zpex, Zpex-4, and Zpex-Smile). The objective is to analyze the simultaneous influence of sintering temperature, in the rang

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16

Candido, LM, LN Miotto, LMG Fais, PF Cesar, and LAP Pinelli. "Mechanical and Surface Properties of Monolithic Zirconia." Operative Dentistry 43, no. 3 (2018): E119—E128. http://dx.doi.org/10.2341/17-019-l.

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SUMMARY Purpose: This study compared monolithic zirconia with conventional ones based on mean roughness (Ra), Vickers hardness (VHN), topography, transmittance, grain size, flexural strength (FS), Weibull modulus, and fractographic behavior. Methods and Materials: One monolithic (Prettau Zircon [PR group]) and two conventional (ICE Zirkon Transluzent [IZ group] and BloomZir [BL group]) zirconias were used. Specimens were tested using a profilometer, a microhardness tester, a scanning electron microscope, a spectrophotometer, and a Universal Testing Machine (EMIC DL 2000). Ra, VHN, grain size,

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17

Zhang, Quan, Guo Feng, Feng Jiang, et al. "Facile preparation of ZrO2 whiskers by LiF-KCl molten salts synthesis." Processing and Application of Ceramics 15, no. 3 (2021): 219–25. http://dx.doi.org/10.2298/pac2103219z.

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Monoclinic zirconia (ZrO2) whiskers were made via the molten salt method using zirconyl chloride octahydrate (ZrOCl2 ? 8H2O) as zirconium source, potassium chloride (KCl) as molten salt and lithium fluoride (LiF) as a mineraliser. DSC-TG, XRD, FE-SEM, Raman and TEM were performed to study the effects of heat treatment temperature, holding time and heating rate on the synthesis of zirconia whiskers. The results indicate that zirconia whiskers with diameters of 50-80 nm and aspect ratios of 10-30 can be obtained by heating the precursor at slow rate (3?C/min) to 718?C for 1 h and then at faster

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18

Valéro, Rémi, Bernard Durand, Jean-Louis Guth, and Thierry Chopin. "Influence des ions fluorure et de la silice amorphe sur la solubilité des gels de zircone et caractérisation des fluoro-complexes de zirconium en milieu moyennement acide." Canadian Journal of Chemistry 77, no. 12 (1999): 2099–104. http://dx.doi.org/10.1139/v99-204.

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The solubility of zirconia gels versus pH is studied in order to state first the influence of F- ions alone, then the influence of the simultaneous presence of F- and amorphous silica. Two concentrations of F- ions are chosen, 0.094 and 0.314 mol L-1, corresponding to initial molar ratios F/Zr = 0.6 and 2.0. Metal fluorocomplexes formed at pH 0.5 and 2.5 are characterized by 19F NMR. The influence of F- on the solubility of zircon is also studied. It is shown that the formation of silicon complexes rich in fluorine shifts the equilibriums between the zirconium fluorocomplexes toward the comple

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19

Li, Xiao Xi, Ling Chen, Bing Li, and Lin Li. "Preparation of Zirconia Nanopowders in Ultrasonic Field by the Sol-Gel Method." Key Engineering Materials 280-283 (February 2007): 981–86. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.981.

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Zirconia nanopowders were prepared in the ultrasonic field by the sol-gel method and the sonochemical effect on the structure of zirconium hydroxide and the zirconia nanopowder properties were systematically investigated in this work. Ultrasound was introduced into the different stages of the synthesis of zirconia nanopowders in sol-gel reaction system, and zirconium hydroxides and the zirconia nanopowders with different properties were obtained. The results indicated that ultrasonic cavitation could not only disaggregate the agglomerates of zirconia colloidal particles but also reduce the amo

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20

Liang, Li Ping, and Cai Xia Su. "Facile Deposition of Zirconia Optical Films Based on the Solvothermal Treatment of Zirconyl Nitrate-Water-Methanol System." Applied Mechanics and Materials 217-219 (November 2012): 1033–37. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.1033.

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Zirconia optical films have been facilely deposited based on a modified sol-gel route, which involved solvothermal-treating a mixture of zirconyl nitrate, water, and methanol at 80 °C to produce zirconia-based sols, spin-coating the sols on K9 glass substrates, and then calcining the films at moderate temperatures. The experiments show that, at the proper volume ratio of methanol to water VM/VW(from 40/35 to 70/5), the high deprotonation-condensation reaction rate of the precursor zirconium salt, along with the moderate critical supersaturation level of the reaction medium, give rise to stable

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21

Zhao, Shan Shan, Chao Liu, Xiu Jie Ji, Song Li, and Dong Xia Ma. "Synthesis of Ordered Lamellar Nanostructured Zirconia via SDS Template." Advanced Materials Research 178 (December 2010): 296–99. http://dx.doi.org/10.4028/www.scientific.net/amr.178.296.

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The ordered lamellar nanostructured zirconias were prepared via atmospheric reflux and hydrothermal hybrid method in ethanol-water system by using zirconium oxychloride as zirconium source and sodium dodecyl sulfonate (SDS) as template agent, which were characterized by X-ray diffraction (XRD). The results showed that the ordered lamellar nanostructured zirconias were composed of tetragonal phase for 110 and 125°C and tetragonal/monoclinic phase for 140 and 155°C. As the hydrothermal temperature raised, the monoclinic phase began to appear, and the crystallization is promoted, but the ordered

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22

Chen, Jian Feng, Li Sheng Zhao, Yan Zhao, et al. "Test of Relative Translucency for Four All-Ceramic Core Material after Veneering Ceramic." Key Engineering Materials 544 (March 2013): 388–91. http://dx.doi.org/10.4028/www.scientific.net/kem.544.388.

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Objective: To study the relative translucency of 4 veneered and glazed all-ceramic systems core material, including Vita In-Ceram Alumina, Vita In-Ceram Zirconium, Ivoclar Vivodent Empress and Colored Zirconia. Methods: Under standard black and write background, the surface light reflectivity of 4 veneered all-ceramic systems core material was determined with contact color difference meter, and the ratio of Yb /Yw was calculated. Results: After veneered, the relative translucency of 4 core materials all declined, and ranged from 0.8015 of Colored Zirconia to 1.00 of In-Ceram zirconia, among of

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23

Wang, Teng Yu, You Guo Xu, Zhao Hui Huang, et al. "Influence of CeO₂ Additive on the Phase Transformations of Zirconia from Zircon Ore by Carbothermal Reduction Process." Key Engineering Materials 602-603 (March 2014): 238–41. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.238.

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This paper mainly discusses the influences of heating temperatures and CeO2 additive contents on the phase transformations of zirconia from zircon ore by carbothermal reduction. The phase transformations of zirconia from zircon ore by carbothermal reduction were monitored by X-ray diffraction. The microstructure of the product was characterized by scanning electron microscopy. The results show that without adding CeO2, the optimized heating temperature of zircon carbothermal reduction was 1600 °C and the main phases of the product were m-ZrO2, ZrC and β-SiC, t-ZrO2; After adding CeO2, the main

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Kongkiatkamon, Suchada, Dinesh Rokaya, Santiphab Kengtanyakich, and Chaimongkon Peampring. "Current classification of zirconia in dentistry: an updated review." PeerJ 11 (July 14, 2023): e15669. http://dx.doi.org/10.7717/peerj.15669.

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Zirconia, a crystalline oxide of zirconium, holds good mechanical, optical, and biological properties. The metal-free restorations, mostly consisting of all-ceramic/zirconia restorations, are becoming popular restorative materials in restorative and prosthetic dentistry choices for aesthetic and biological reasons. Dental zirconia has increased over the past years producing wide varieties of zirconia for prosthetic restorations in dentistry. At present, literature is lacking on the recent zirconia biomaterials in dentistry. Currently, no article has the latest information on the various zircon

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Jayaram, Siri, Basavaraj S. Salagundi, Ashika B.K, Pavithra S., Vishesh N., and Siddharth Hoskere. "COMPARATIVE EVALUATION OF SHEAR BOND STRENGTH OF TWO DIFFERENT RESIN CEMENT TO ZIRCONIA AFTER SURFACE TREATMENT USING ER:YAG LASER: AN IN VITRO STUDY." International Journal of Advanced Research 12, no. 09 (2024): 1219–32. http://dx.doi.org/10.21474/ijar01/19555.

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Zirconia (ZrO2), a crystalline dioxide of zirconium, boasts metal-like mechanical properties and a tooth-like color. Creating a ZrO2 core for prosthetic restorations necessitates a CAD/CAM system adept at handling zirconia. Resin-bonded luting is the top choice for zirconia ceramic restorations, with tribochemical treatment preferred for surface preparation before resin cement luting. Clinical trials indicate that resin cementation improves adhesion and mechanical properties of zirconia restorations. While studies on sandblastings effect on shear bond strength to zirconia exist, more data is n

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Liu, Lu, Jun-an Zhao, Shuzhong Wang, Baoquan Zhang, Jianqiao Yang, and Hui Liu. "Supercritical Hydrothermal Synthesis of Nano-Zirconia: Reaction Path and Crystallization Mechanisms of Different Precursors." E3S Web of Conferences 406 (2023): 01025. http://dx.doi.org/10.1051/e3sconf/202340601025.

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Nano-zirconia exhibits excellent mechanical properties (fracture toughness, hardness and flexural strength), thermal performance (thermal conductivity), optical properties and biological properties for various ceramic-based applications. Supercritical hydrothermal synthesis technology is an advanced and environmental-friendly method for preparing nanoscale powders. In this paper, the formation and crystallization of nano-zirconia during supercritical hydrothermal synthesis were systematically investigated. Different precursors (zirconium nitrate, zirconium oxychloride, zirconium acetate) react

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Uchikoshi, T., Y. Sakka, K. Ozawa, and K. Hiraga. "Preparation of fine-grained monoclinic zirconia ceramics by colloidal processing." Journal of Materials Research 13, no. 4 (1998): 840–43. http://dx.doi.org/10.1557/jmr.1998.0110.

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Fine-grained monoclinic zirconia ceramic was made from well-dispersed zirconia sol prepared by the hydrolysis of zirconium chloride oxide octahydrate. Dechlorinated and concentrated zirconia sol was consolidated by pressure filtration. The relative green density of the compact was improved by the following cold isostatic pressing treatment at 400 MPa. The compact was densified by pressureless sintering to >98% of theoretical density in air at 1100 °C, which is lower than that of monoclinic to tetragonal transformation of pure zirconia. The average grain size of the sintered monoclinic zirco

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Nikishina, E. E., E. N. Lebedeva, and D. V. Drobot. "ZIRCONIUM AND HAFNIUM DIOXIDES DOPED BY OXIDES OF YTTRIUM, SCANDIUM AND ERBIUM: NEW METHODS OF SYNTHESIS AND PROPERTIES." Fine Chemical Technologies 13, no. 5 (2018): 30–37. http://dx.doi.org/10.32362/2410-6593-2018-13-5-30-37.

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The results of elaborating a method for the synthesis of zirconia and hafnia doped by rare earths (yttrium, erbium and scandium) by using low-hydrated hydroxides of zirconium and hafnium as precursors are reported. The low-hydrated zirconium and hafnium hydroxides were prepared using the heterophase reaction. The physicochemical properties (including sorption properties) of low-hydrated zirconium and hafnium hydroxides ZrxHf1-x(OH)3÷1O0.5÷1.5·0.9÷2.9H2Owere studied. The scheme of thermal decomposition of low-hydrated hydroxides in air was determined. The sorption properties of the low-hydrated

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Lee, Jeong Han, Da Som Kang, Min Kuk Moon, and Sung Kil Hong. "Separating Technology of Pure Zirconia from Zircon-Sand by the Ar-H₂ Arc Plasma Fusion and the Microwave Leaching." Materials Science Forum 879 (November 2016): 1080–85. http://dx.doi.org/10.4028/www.scientific.net/msf.879.1080.

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Abstract (sommario):

Zirconia (ZrO2) has excellent properties such as high toughness, high strength, thermal stability and high corrosion resistance. Thus, recent zirconia has been spotlighted as a dental material. Most of pure zirconia has been separated from zircon sand (ZrSiO4) by wet refining process which is very complex and not an environmental. The arc plasma fusion method has the advantages as a sustainable process that can easily and quickly get very good fine and high pure powders from the original materials compared with traditional wet method. In this study, zircon sand is separated into zirconia and s

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30

Rodaev, Vyacheslav V., Svetlana S. Razlivalova, Andrey O. Zhigachev, Vladimir M. Vasyukov, and Yuri I. Golovin. "Preparation of Zirconia Nanofibers by Electrospinning and Calcination with Zirconium Acetylacetonate as Precursor." Polymers 11, no. 6 (2019): 1067. http://dx.doi.org/10.3390/polym11061067.

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Abstract (sommario):

For the first time, zirconia nanofibers with an average diameter of about 75 nm have been fabricated by calcination of electrospun zirconium acetylacetonate/polyacrylonitrile fibers in the range of 500–1100 °C. Composite and ceramic filaments have been characterized by scanning electron microscopy, thermogravimetric analysis, nitrogen adsorption analysis, energy-dispersive X-ray spectroscopy, and X-ray diffractometry. The stages of the transition of zirconium acetylacetonate to zirconia have been revealed. It has been found out that a rise in calcination temperature from 500 to 1100 °C induces

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31

Hakuta, Yukiya, Tomotugu Ohashi, Hiromichi Hayashi, and Kunio Arai. "Hydrothermal synthesis of zirconia nanocrystals in supercritical water." Journal of Materials Research 19, no. 8 (2004): 2230–34. http://dx.doi.org/10.1557/jmr.2004.0314.

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Abstract (sommario):

Zirconia nanocrystals were prepared by hydrothermal reaction of 0.05 M zirconyl nitrate and zirconyl acetate solutions at supercritical conditions of 400 °C and30 MPa for 1.8 s reaction time. Characterization of products were performed byx-ray diffraction, transmission electron microscopy, and Brunauer–Emmett–Teller measurements. The product particles were compared with zirconia particles prepared by conventional hydrothermal synthesis routes and precipitation-calcination. From the results, zirconia powders prepared in supercritical water had higher crystallinity than those obtained by other m

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32

Lin, Cui Hua, Xiong Fei Zhang, Yang Hou, Ya Li Wang, and Gui Wang. "Synthesis of Calcium Oxide Stabilized Cubic Zirconia Powders by Electrochemical Method." Advanced Materials Research 233-235 (May 2011): 2403–8. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.2403.

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Abstract (sommario):

Calcium oxide stabilized cubic zirconia powders were synthesized with electrochemical method using analytical reagent zirconium oxychloride and calcium oxide as the raw materials. From XRD analysis, zirconia powders doped calcium oxide are mainly being as cubic phase under the temperature lower than 1100°C. While the zirconia powders which did not doped calcium oxide were transformed from cubic phase to monoclinic phase when the powders were sintered at 750°C. The calcium oxide used as dopant in zirconia has two advantages, the first is that it can stabilize the cubic zircnnia, the second is t

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33

Benalcázar-Jalkh, Ernesto B., Edmara T. P. Bergamo, Tiago M. B. Campos, et al. "A Narrative Review on Polycrystalline Ceramics for Dental Applications and Proposed Update of a Classification System." Materials 16, no. 24 (2023): 7541. http://dx.doi.org/10.3390/ma16247541.

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Abstract (sommario):

Dental zirconias have been broadly utilized in dentistry due to their high mechanical properties and biocompatibility. Although initially introduced in dentistry as an infrastructure material, the high rate of technical complications related to veneered porcelain has led to significant efforts to improve the optical properties of dental zirconias, allowing for its monolithic indication. Modifications in the composition, processing methods/parameters, and the increase in the yttrium content and cubic phase have been presented as viable options to improve zirconias’ translucency. However, concer

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34

Cheng, Ben Jun, Xing Zhong Guo, Li Li, and Jian Ming Zheng. "Effects of Zircon Additive on the Properties of 95-Alumina Ceramic." Key Engineering Materials 280-283 (February 2007): 1013–16. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1013.

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Abstract (sommario):

The mechanism of the effect that zircon additive had on the properties of 95-alumina ceramic was studied and compared with that of zirconia additive. The results show that zircon additive can decrease the sintering temperature of 95-alumina ceramic, the suitable content of zircon additive is 3% and the suitable sintering temperature is1630°C; under these conditions, the 95-alumina composite ceramic can obtain satisfactory sintering and mechanical properties. Compared with zirconia additive, besides the stress-induced-phase-transformation of ZrO2 and micro-cracks, the toughened mechanism of 95-

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35

Wang, Xin M., and Ping Xiao. "Solvothermal synthesis of zirconia and yttria-stabilized zirconia nanocrystalline particles." Journal of Materials Research 22, no. 1 (2007): 46–55. http://dx.doi.org/10.1557/jmr.2007.0012.

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Abstract (sommario):

A solvothermal method was used to prepare zirconia and yttria-stabilized zirconia (YSZ) particles using zirconium hydroxide and yttrium hydroxide particles as precursors and ethanol or isopropanol as reaction media. The particle properties were characterized with x-ray diffractometry, scanning electron microscopy, transmission electron microscopy, thermal analysis, laser particle-size analysis, nitrogen adsorption (Brunauer–Emmett–Teller method) and Zeta potential analysis. Cubic/tetragonal ZrO2 and YSZ nanocrystals with crystallite size around 5 nm were obtained. The effect of different hydro

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36

Nuamsrinuan, Nisakorn, Ekachai Hoonnivathana, Pichet Limsuwan, and Kittisakchai Naemchanthara. "Studying the Effect of ZrO₂ Addition on Hydroxyapatite via Ball Milling Technique." Applied Mechanics and Materials 866 (June 2017): 17–20. http://dx.doi.org/10.4028/www.scientific.net/amm.866.17.

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Abstract (sommario):

The bio-composited ceramic stabilized zirconia-hydroxyapatite had been formed by ball milling method. The hydroxyapatite was synthesized from chicken eggshell via chemical precipitation. And it was mixed with stabilized zirconia powder together. All of the samples had been investigated by XRD, FTIR and UTM tester. The XRD and FTIR result showed that the stabilized zirconia-hydroxyapatite sample powder after ball mill was found only hydroxyapatite and zirconia phase without addition of other phase. High crystallinity of hydroxyapatite can be found after heat treatment and calcium zirconium oxid

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37

He, Yong Wu, Jing Long Bu, Rui Sheng Wang, et al. "Sintering Properties of Fused Silica/Nano-Zirconia Composite Ceramic." Advanced Materials Research 750-752 (August 2013): 81–84. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.81.

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Abstract (sommario):

Zirconyl chloride was used as zirconium source and fused silica particles were used as main raw material. First of all, the composite powders were prepared by wet chemical synthesis using ammonia as the precipitator and polyethylene glycol as the dispersant. Then, fused silica nanozirconia composite ceramic containing nanometer particle zirconia with different contents (5%, 15%, 25% and 35%) were fabricated in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1 h. The bulk density and bending strength were measured, microstructure was observed by SEM. The result indicated bulk density and

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38

Lee, Hee Seon, Jeong Min Park, Kyu Hong Hwang, and Hyung Mi Lim. "Surface Functionalization of Zirconia Nanocrystals with Silane Coupling Agent and its Dispersion Behavior in O-Phenylphenoxyethyl Acrylate." Materials Science Forum 922 (May 2018): 20–25. http://dx.doi.org/10.4028/www.scientific.net/msf.922.20.

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Abstract (sommario):

Highly crystalline and dispersible zirconia, synthesized by solvothermal reaction of zirconium (IV) isopropoxide isopropanol complex in benzyl alcohol, were functionalized with silane coupling agent and dispersed with o-phenylphenoxyethyl acrylate (OPPEA). Silane coupling agents such as 3-aminopropyltriethoxysilane (APTES) of amino functional silane, decyltrimethoxysilane (DTMS) of alkyl functional silane and 3-(trimethoxysilyl) propyl methacrylate (MPS) of acrylate functional silane have been used to modify nanoparticle surfaces and obtain dispersion of nanoparticles within OPPEA. The surface

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39

Szawioła-Kirejczyk, Magdalena, Karolina Chmura, Krzysztof Gronkiewicz, Andrzej Gala, Jolanta E. Loster, and Wojciech Ryniewicz. "Adhesive Cementation of Zirconia Based Ceramics-Surface Modification Methods Literature Review." Coatings 12, no. 8 (2022): 1067. http://dx.doi.org/10.3390/coatings12081067.

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Abstract (sommario):

Introduction: The conditioning procedures for glass-based ceramic restorations before adhesive cementation are generally recognized. In the case of polycrystalline ceramics, which include zirconium oxide, there is still no standardized protocol. The aim of this work was to present conditioning methods of the cementation surface of zirconium oxide fixed dentures. The new generation high translucency zirconia has been also considered. Material and method: The following keywords for the PUBMED and EMBASE databases were used: zirconium oxide, zirconium oxide with increased translucency, bond stren

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40

Jung, T. H., and R. V. Subramanian. "Alkali resistance enhancement of basalt fibers by hydrated zirconia films formed by the sol-gel process." Journal of Materials Research 9, no. 4 (1994): 1006–13. http://dx.doi.org/10.1557/jmr.1994.1006.

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Abstract (sommario):

Basalt fibers were dip-coated in zirconium-n-propoxide, unstabilized or stabilized by chelation with ethyl acetoacetate. The thermal transformations of the hydrated zirconia coatings formed were investigated by dynamic x-ray diffraction and differential thermal analysis. The changes in the surface chemical compositions of coated and uncoated fibers, following alkali immersion extending to 90 days, were characterized by EDXA and IR spectral analysis. Fiber strengths were also measured after immersion in 0.1 M NaOH for different durations. It was found that the transition of the amorphous zircon

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41

WENDEL, H., H. HOLZSCHUH, H. SUHR, G. ERKER, S. DEHNICKE, and M. MENA. "THIN ZIRCONIUM DIOXIDE AND YTTRIUM OXIDE-STABILIZED ZIRCONIUM DIOXIDE FILMS PREPARED BY PLASMA-CVD." Modern Physics Letters B 04, no. 19 (1990): 1215–25. http://dx.doi.org/10.1142/s0217984990001537.

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Abstract (sommario):

Thin zirconia (zirconium dioxide) films are deposited by PECVD using as precursors organometallic compounds, metal alkoxides, and metal β-diketonates. The properties of the films depend on the substrate temperature, power density and the nature and partial pressure of the precursor. Thin films of zirconia stabilized with yttria (yttrium oxide) are formed at relatively low deposition temperatures (500°C) using the β-diketones of zirconium and yttrium.

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42

Szymanski, R., and H. Charcosset. "Platinum-Zirconium Alloy Catalysts Supported on Carbon or Zirconia." Platinum Metals Review 30, no. 1 (1986): 23–27. http://dx.doi.org/10.1595/003214086x3012327.

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Abstract (sommario):

The preparation of platinum-zirconium alloy catalyst systems is described and their characterisation reveals interesting structures. Studies on a number of catalytic reactions indicate that these alloy systems have catalytic properties significantly different from platinum on zirconia systems. In addition these catalysts do not segregate into platinum and zirconia or zirconium carbide either in air at atmospheric pressure or under conditions used in catalytic processes.

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43

Ma, Xiang Dong, Fei Lei Liu, Hui Zhang, et al. "Preparation of Zirconia Nanoparticles in Ionic Liquid –Water and Characterization." Applied Mechanics and Materials 52-54 (March 2011): 630–32. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.630.

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Abstract (sommario):

Zirconia nanoparticles were prepared in ionic liquid BMIMBF4-water using zirconium salt (ZrOCl2•8H2O), urea as raw material by hydrothermal synthesis method. The structure and morphology of zirconia were characterized by XRD and TEM. The experimental results showed zirconia nanoparticles could be prepared at 170°C for 24 hours in a hydrothermal kettle. Its size was about 10-30nm and the particles dispersed uniformly, and had no agglomeration phenomenon.

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44

Markovic, Jelena, and Slobodan Milonjic. "Synthesis of zirconia colloidal dispersions by forced hydrolysis." Journal of the Serbian Chemical Society 71, no. 6 (2006): 613–19. http://dx.doi.org/10.2298/jsc0606613m.

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Abstract (sommario):

Different zirconia colloidal dispersions (sols) were prepared from zirconyl oxynitrate and zirconyl oxychloride solutions by forced hydrolysis. Vigorously stirred acidic solutions of these salts were refluxed at 102 oC for 24 h. Characterization of the obtained sols (pH, solid phase content crystal structure) was performed by potentiometric, XRD, TGA/DTA and SEM measurements. The prepared sols contained almost spherical monoclinic hydrated zirconia particles 7-10 nm in diameter.

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45

Primachenko, V. V., I. G. Shulyk, K. I. Kushchenko, et al. "Study on the effect of ZrO2 and SiO2 additions type on the properties of high alumina crucibles for melting heat-resistant alloys and steels." Scientific research on refractories and technical ceramics 121 (December 30, 2021): 46–54. http://dx.doi.org/10.35857/2663-3566.121.05.

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Abstract (sommario):

The technology of vibrocasting high-quality refractories from granular masses of different chemical composition, size, configuration and weight of products, in particular crucibles for induction melting of heat-resistant alloys was developed and introduced by JSC “URIR named after A. S. Berezhnoy”. According to the developed technology, mullite-alumina zircon-containing crucibles contain ZrO2 ~ 8 %, zirconia-containing crucibles — ~ 17 %, alumina zircon-containing crucibles — ~ 8 %, ~ 8—10 % and ~ 25 %, have open porosity < 20 %, cold crushing strength depending on the used raw materials an

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46

Li, Xiao-Peng, Li-Li Wang, Zai-Lei Gong, Xiu-Feng Wang, and Ye-Ming Zhou. "Preparation of inverse opal zirconia." Science of Sintering 50, no. 3 (2018): 387–94. http://dx.doi.org/10.2298/sos1803387l.

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Abstract (sommario):

Inverse opal zirconia is useful in many ways because of their ability to combine several chemical and physical properties. In this research, polystyrene template was fabricated by self-assembly method and inverse opal zirconia was prepared by colloidal crystal-templating method. The process of preparation of inverse opal zirconia as well as effects on morphology and phase of as-prepared inverse opal zirconia were studied. The results showed precursor ratio of zirconium acetate and methanol, mass ratio of polystyrene templates and precursor and dipping times had remarkable influence on morpholo

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47

Shyu, Jiin-Jyh, and Yuan-Chieh Chen. "Zirconia-mullite ceramics made from composite particles coated with amorphous phase: Part II. Effects of boria additions to the amorphous phase." Journal of Materials Research 10, no. 10 (1995): 2592–98. http://dx.doi.org/10.1557/jmr.1995.2592.

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Abstract (sommario):

Mullite and zirconia-mullite ceramics have been prepared by coating alumina/zirconia particles with an amorphous silica layer. The effect of composition change of the amorphous silica layer by adding B2O3 was investigated. For the zirconia-free compositions, the addition of B2O3 remarkably accelerates the kinetics of the crystallization of the amorphous coating layer, the viscous sintering, and the mullitization. For the zirconia-containing ceramics, the addition of B2O3 enhanced the viscous sintering kinetics and delayed the decomposition of the transient zircon phase and the subsequent t- to

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48

Bellon, K., D. Chaumont, and D. Stuerga. "Flash synthesis of zirconia nanoparticles by microwave forced hydrolysis." Journal of Materials Research 16, no. 9 (2001): 2619–22. http://dx.doi.org/10.1557/jmr.2001.0360.

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Abstract (sommario):

Forced hydrolysis preparation of zirconia sols and powders by microwave heating of zirconium tetrachloride solutions at temperatures equal to 180 °C leads in a few minutes to monodispersed nanoscale zirconia particles. Synthesis was performed in a microwave reactor called the RAMO system. This microwave reactor was designed by the authors. This flash-synthesis process combines the advantages of forced hydrolysis (homogeneous precipitation) and microwave heating (very fast heating rates). The sols and powders were characterized by x-ray diffraction,photon correlation spectroscopy (PCS), small-a

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49

Berdin, Clotilde, Yan Tang, and Serge Pascal. "Microstresses in ZrO₂ Layer and Lateral Cracking." Advanced Materials Research 996 (August 2014): 924–29. http://dx.doi.org/10.4028/www.scientific.net/amr.996.924.

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Abstract (sommario):

Micromechanical simulations of polycrystalline zirconia using the finite element method are performed in order to obtain the stresses at the grain scale of a zirconium oxide layer, since these microstresses are important for damage prediction of the layer and then oxidation kinetics. The crystallographic texture of the layer of monoclinic zirconia is taken into account. The results show that even under high compressive macroscopic stresses, the microstresses can contribute to lateral cracking promoted by the presence of tetragonal zirconia.

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50

Zhao, Junping, Christopher S. Gaddis, Ye Cai, and Kenneth H. Sandhage. "Free-standing microscale structures of nanocrystalline zirconia with biologically replicable three-dimensional shapes." Journal of Materials Research 20, no. 2 (2005): 282–87. http://dx.doi.org/10.1557/jmr.2005.0046.

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Abstract (sommario):

Microscale zirconia structures with intricate three-dimensional (3D) shapes and nanoscale features were synthesized using diatom (single-celled algae) microshells as transient scaffolds. After exposure to a zirconium alkoxide-bearing solution and firing at 550–850 °C, silica-based diatom microshells were coated with a thin, continuous nanocrystalline zirconia layer. Predominantly tetragonal or monoclinic zirconia could be produced with appropriate heat treatments. Selective silica dissolution then yielded freestanding zirconia micro-assemblies that retained the microshell shape and fine featur

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