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Journal articles on the topic 'Zirconia Toughened Alumina (ZTA) heads'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Piconi, Corrado, G. Maccauro, and F. Muratori. "Alumina Matrix Composites in Arthroplasty." Key Engineering Materials 284-286 (April 2005): 979–82. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.979.

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It is well known that the introduction of zirconia into the alumina matrix has a positive effect on bending strength of the material, and especially on toughness which is the main limit of alumina ceramics. While the many attempts made in the past to develop alumina matrix composites suitable for biomedical applications containing zirconia as a toughening phase (Zirconia Toughened Alumina – ZTA) did not leave the developmental stage, recently ball heads and inlays for THR bearings made out a three phase alumina matrix composite were introduced into the market. In the alumina matrix of this mat

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2

Tateiwa, Toshiyuki, Elia Marin, Alfredo Rondinella, et al. "Burst Strength of BIOLOX®delta Femoral Heads and Its Dependence on Low-Temperature Environmental Degradation." Materials 13, no. 2 (2020): 350. http://dx.doi.org/10.3390/ma13020350.

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Zirconia-toughened alumina (ZTA) currently represents the bioceramic gold standard for load-bearing components in artificial hip joints. ZTA is long known for its high flexural strength and fracture toughness, both properties arising from a microscopic crack-tip shielding mechanism due to the stress-induced tetragonal-to-monoclinic (t→m) polymorphic transformation of zirconia. However, there have been concerns over the years regarding the long-term structural performance of ZTA since the t→m transformation also spontaneously occurs at the material’s surface under low-temperature environmental

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3

Sugano, Nobuhiko, and Giuseppe Pezzotti. "Role of Grain Size Fluctuations on the Environmental Resistance of Alumina-Zirconia Composite in Comparison with Commercially Available Monolithic Zirconia Femoral Head." Advances in Science and Technology 76 (October 2010): 235–39. http://dx.doi.org/10.4028/www.scientific.net/ast.76.235.

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Raman microprobe spectroscopy and atomic force microscopy (AFM) were systematically used to characterize the surface of an advanced alumina/zirconia composite (henceforth also referred to as zirconia toughened alumina, ZTA), in comparison with a commercially available femoral head made of monolithic zirconia. Experiments were conducted before and after in vitro exposure in water moist environment up to 100 h. Both materials contained zirconia partly stabilized with yttria. Tetragonal-to-monoclinic phase transformation, which was quantitatively characterized by confocal Raman spectroscopy as a

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4

Yorifuji, Makiko, Saverio Affatato, Toshiyuki Tateiwa, et al. "Wear Simulation of Ceramic-on-Crosslinked Polyethylene Hip Prostheses: A New Non-Oxide Silicon Nitride versus the Gold Standard Composite Oxide Ceramic Femoral Heads." Materials 13, no. 13 (2020): 2917. http://dx.doi.org/10.3390/ma13132917.

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The purpose of the present study was to compare the wear behavior of ceramic-on-vitamin-E-diffused crosslinked polyethylene (Vit-E XLPE) hip bearings employing the gold standard oxide ceramic, zirconia (ZrO2)-toughened alumina (Al2O3) (ZTA, BIOLOX®delta) and a new non-oxide ceramic, silicon nitride (Si3N4, MC2®). In vitro wear test was performed using a 12-station hip joint simulator. The test was carried out by applying the kinematic inputs and outputs as recommended by ISO 14242-1:2012. Vitamin-E-diffused crosslinked polyethylene (Vit-E XLPE) acetabular liners (E1®) were coupled with Ø28-mm

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Rondinella, Alfredo, Elia Marin, Brian J. McEntire, et al. "Bioceramics are Not Bioinert: The Role of Oxide and Non-Oxide Bioceramics on the Oxidation of UHMWPE Components in Artificial Joints." Key Engineering Materials 782 (October 2018): 165–75. http://dx.doi.org/10.4028/www.scientific.net/kem.782.165.

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The following research is aimed at understanding the influence of Zirconia-Toughened Alumina (ZTA) and Silicon Nitride (Si3N4) on Ultra-High Molecular Weight Polyethylene (UHMWPE) acetabular liners. Bioceramic femoral heads were systematically tested against UHMWPE in controlled environment according to static/load-free coupling in hydrothermal environment, pin-on-ball wear testing, and hip-simulator wear testing. In addition, a retrieved ZTA femoral head has been analyzed and results have been compared to the simulations. Experimental results from X-ray photoelectron (XPS), cathodoluminescenc

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6

Wang, J., and R. Stevens. "Zirconia-toughened alumina (ZTA) ceramics." Journal of Materials Science 24, no. 10 (1989): 3421–40. http://dx.doi.org/10.1007/bf02385721.

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7

Nakanishi, Takefumi, Megumi Sasaki, Junji Ikeda, Fumiaki Miyaji, and Makoto Kondo. "Mechanical and Phase Stability of Zirconia Toughened Alumina." Key Engineering Materials 330-332 (February 2007): 1267–70. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.1267.

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The JMM-ZTA, a kind of zirconia-toughened alumina, is a bearing ceramic newly developed for artificial joints. Although it has already been reported that mechanical strength and fracture toughness are higher in the JMM-ZTA than in alumina, the stability of the JMM-ZTA has not been studied in detail yet. In the present study, the stability of the JMM-ZTA with respect to mechanical strength and crystalline phases was examined under hydrothermal environment, and the results were compared with those of alumina. Both the 4-point bending strength and the fraction of monoclinic zirconia unchanged eve

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8

Nakanishi, Takefumi, Kunihide Shikata, Yu Cong Wang, Mikio Iwamoto, and Makoto Kondo. "The Characteristics of the New Ceramic Material for Artificial Joints." Key Engineering Materials 309-311 (May 2006): 1235–38. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.1235.

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A new zirconia-toughened alumina ceramic (JMM-ZTA) for a ceramic-on-ceramic hip replacement has been developed. The JMM-ZTA has a fracture toughness superior to zirconia, and the JMM-ZTA/JMM-ZTA combination has superior wear-resistant performance to alumina/alumina. Moreover, the JMM-ZTA shows an excellent crystalline phase stability. Therefore, the JMM-ZTA is believed to be useful for artificial hip prostheses.

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9

Ikeda, Junji, Megumi Mabuchi, Takefumi Nakanishi, Fumiaki Miyaji, Masaru Ueno, and Giuseppe Pezzotti. "Phase Stability and Fracture Toughness of Zirconia Toughened Alumina for Joint Replacement." Key Engineering Materials 361-363 (November 2007): 767–70. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.767.

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As for zirconia toughened alumina (ZTA) with various ratios of alumina/zirconia, crystal and micro structures, fracture toughness and phase stability were evaluated by X-ray diffraction, Raman spectroscopy, and aging test in hydrothermal environment. The grain size and monoclinic fraction of zirconia phase and residual stress in alumina matrix changed as a function of zirconia content. The ZTA showed higher fracture toughness than conventional alumina. The fracture toughness of ZTA was highest at which the content of tetragonal zirconia was maximum. The monoclinic fraction of ZTA did not incre

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10

Rejab, Nik Akmar, Nurul Khairunnisa Su, Wan Fahmin Faiz Wan Ali, Mohd Fadzil Ain, Zainal Arifin Ahmad, and Norazharuddin Shah Abdullah. "Structural Characteristic and Dielectric Properties of Zirconia Toughened Alumina." Materials Science Forum 1010 (September 2020): 250–55. http://dx.doi.org/10.4028/www.scientific.net/msf.1010.250.

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Zirconia toughened alumina (ZTA) has shown a great effect in the cutting tool application due to its high hardness and comparable fracture toughness. However, the capability of the materials to be applied in as the dielectric resonator antenna (DRA) is not being discussed in detail. In this study, an attempt is made to further explore the potential of ZTA to be applied in DRA. Various related characterization techniques were applied that is subjected to DRA properties. The addition of CeO2 (0 wt.% to 15 wt.%) on ZTA has been pressed into pellets shape and sintered at 1600 °C for 2 hours under

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11

Esfahani, H., Ali Nemati, and E. Salahi. "The Effects of Composition and Sintering Conditions on Zirconia Toughened Alumina (ZTA) Nanocomposites." Advanced Materials Research 93-94 (January 2010): 695–98. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.695.

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Zirconia Toughened Alumina (ZTA) Nanocomposites were prepared using Nano sized Zirconia (ZrO2) powders doped with 3% mol of yttria (Y2O3) nanopowders. Diffusion of α-alumina (Al2O3) nanoparticles as well as yttria into the Zirconia lattice network drives monoclinic – tetragonal martensitic transformation. Zirconia toughened alumina (ZTA) composites containing different amount of partially stabilized Zirconia (PSZ) 5, 10, 15 and 20% mol, were prepared via wet mixing and axial pressing. After sintering at different temperatures,1450, 1550 and 1650 °C, phase change in the samples were monitored.

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12

Ikeda, Junji, Giuseppe Pezzotti, and Takefumi Nakanishi. "Phase Stability of Zirconia Toughened Alumina Composite for Artificial Joints." Key Engineering Materials 309-311 (May 2006): 1243–46. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.1243.

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The phase stability under aqueous condition and changes in the wear region after the Pin-on-Flat wear testing were evaluated using Raman and fluorescence spectroscopy techniques and X-ray diffractometry for a newly developed zirconia toughened alumina (JMM-ZTA). This study suggests that JMM-ZTA is a highly stable material under aqueous environment in the human body and has a high wear resistance in Pin-on-Flat wear tests. This results from a transformation toughening mechanism operative in JMM-ZTA. Therefore, JMM-ZTA appears to have a possibility to improve the performance of monolithic alumin

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13

Llopis, J., R. Vila, and A. Ibarra. "Photoluminescent characterization of zirconia-toughened alumina (ZTA) ceramics." Journal of Physics and Chemistry of Solids 52, no. 7 (1991): 903–7. http://dx.doi.org/10.1016/0022-3697(91)90012-o.

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14

Spinelli, M. S., G. Maccauro, C. Graci, et al. "Zirconia Toughened Alumina (ZTA) Powders: Ultrastructural and Histological Analysis." International Journal of Immunopathology and Pharmacology 24, no. 1_suppl2 (2011): 153–56. http://dx.doi.org/10.1177/03946320110241s229.

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15

Szutkowska, Magdalena, and Marek Boniecki. "Subcritical crack growth in zirconia-toughened alumina (ZTA) ceramics." Journal of Materials Processing Technology 175, no. 1-3 (2006): 416–20. http://dx.doi.org/10.1016/j.jmatprotec.2005.04.030.

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16

Lee, Ha-Young, Werner Riehemann, and Barry Leslie Mordike. "Sintering of nanocrystalline ZrO2 and zirconia toughened alumina (ZTA)." Journal of the European Ceramic Society 10, no. 3 (1992): 245–53. http://dx.doi.org/10.1016/0955-2219(92)90038-f.

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17

Couto, C. A. de O., S. Ribeiro, and F. R. Passador. "Effect of carbon nanotubes reinforcement on the mechanical properties of alumina and ZTA composites for ballistic application." Cerâmica 64, no. 372 (2018): 608–15. http://dx.doi.org/10.1590/0366-69132018643722475.

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Abstract Toughened and hardened alumina/carbon nanotubes and zirconia-toughened alumina (ZTA)/carbon nanotubes nanocomposites were developed by conventional ceramics route using pressureless sintering for the ballistic application. The multiwall carbon nanotubes (CNT) were functionalized with nitric acid oxidation reaction. Moreover, the surfactants sodium dodecyl sulphate and gum arabic were used to promote a homogeneous distribution of CNT in the ceramic matrix. Ceramic powders were prepared with pure alumina, alumina with the addition of 20 wt% of tetragonal zirconia/yttria, alumina/CNT and

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18

Hu, Mei Ling, Ming Hao Fang, Shu Sen Chen, Tao Yang, Zhao Hui Huang, and Yan Gai Liu. "Effects of Calcium Hexaluminate Addition on the Mechanical Properties of Zirconia-Toughened-Alumina." Key Engineering Materials 544 (March 2013): 286–90. http://dx.doi.org/10.4028/www.scientific.net/kem.544.286.

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The effects of calcium hexaluminate addition on the microstructure and mechanical properties of zirconia-toughened-alumina ceramic were investigated. Zirconia-toughened-alumina (ZTA) composite ceramics which have different additions of calcium hexaluminate were successfully fabricated by pressureless sintering at 1600°C for 3h. The result shows that the bending strength and abrasive wearing improved with the increasing of CaAl12O19addition while the fracture toughness declined.

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19

Drennan, John. "The observation of ?-alumina type phases in zirconia-toughened alumina (ZTA)." Journal of Materials Science Letters 4, no. 6 (1985): 725–27. http://dx.doi.org/10.1007/bf00726972.

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20

Balakrishnan, A., Min Cheol Chu, B. B. Panigrahi, et al. "Surface Strengthening of Zirconia Toughened Alumina (ZTA) Using Glass Infiltration Technique." Solid State Phenomena 124-126 (June 2007): 695–98. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.695.

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Molten Soda lime glass (SLG) was penetrated into the surface of ZTA at 1500°C for the holding time of 1 to 10 h. The depth of the glass penetration increased with increasing holding time. The thermal expansion mismatch and elastic property mismatch between the penetrated glass and ZTA produced residual compression in the surface region during cooling. This residual compression enhanced the flexural strength and fracture toughness remarkably.

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21

Cho, Bum Rae, Ji Hoon Chae, Bo Lang Kim, and Jong Bong Kang. "Fabrication and Characterization of Alumina/Zirconia Ceramic Compound." Materials Science Forum 724 (June 2012): 249–54. http://dx.doi.org/10.4028/www.scientific.net/msf.724.249.

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Sintered ZTA(zirconia toughened alumina) which has good mechanical properties at a low temperature was produced by milling and mixing with Al2O3 and ZrO2(3Y-TZP). In order to examine the effect of sintering aids on the mechanical properties of ZTA, fracture toughness and hardness of the produced ZTA were observed in accordance with change of the added quantity of ZrO2 Scanning electron microscopy and X-ray diffraction technique were applied to observe microstructural change and phase transformation during the process. Experimental results showed that the addition of sintering aids in ZTA at a

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22

Manshor, Hanisah, Wan Muhammad Ihsan Wan Sabri, Abdul Wahid Ramli, Ahmad Zahirani Ahmad Azhar, Ezzat Chan Abdullah, and Zainal Arifin Ahmad. "Effect of Titania and Magnesia on the Physical Properties of Zirconia Toughened Alumina." Materials Science Forum 840 (January 2016): 82–86. http://dx.doi.org/10.4028/www.scientific.net/msf.840.82.

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ZTA based ceramic composite system is widely accepted as cutting tools for many of these harder and wear resistant workpiece materials. This is due to their beneficial mechanical properties i.e. high temperature strength, high hardness and ability to maintain its cutting edge shape at higher temperatures. Although a lot of works have focused on the effect of various sintering additives on the ZTA ceramic system, the effect of Magnesia (MgO) and Titania (TiO2) on ZTA has not yet been studied. In this work, the physical properties of Zirconia Toughened Alumina (ZTA) ceramic composite with MgO an

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23

Chuankrerkkul, Nutthita, Rattanaporn Charoenkijmongkol, Punnapa Somboonthanasarn, Chiraporn Auechalitanukul, and Ryan C. McCuiston. "Microstructure and Properties of Zirconia Toughened Alumina Fabricated by Powder Injection Moulding." Key Engineering Materials 659 (August 2015): 116–20. http://dx.doi.org/10.4028/www.scientific.net/kem.659.116.

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Zirconia toughened alumina (ZTA) ceramic has been fabricated by the powder injection moulding process. The ZTA ceramic, composed of 80 wt% alumina and 20 wt% zirconia, was mixed with a water-soluble, multi-component binder system. The binder ingredients were polyethylene glycol (PEG), polyvinyl butyral (PVB) and stearic acid (SA). Powder injection moulding was performed with powder loadings in the range of 48-52 vol%, using a laboratory-scale injection moulding machine. Water leaching was used for partial binder removal prior to thermal debinding and then sintering at 1650 °C for 2 hours. Micr

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24

Ma, J., K. Zhao, C. Liu, et al. "Composition Optimization of Zirconia Toughened Alumina for Dental Ceramics." Key Engineering Materials 330-332 (February 2007): 1369–72. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.1369.

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The aim of this study was to optimize sintering aids and processing parameters for zirconia toughened alumina (ZTA) nano-ceramics with optimal properties as dental ceramics. Additive agents (TiO2, MgO, SiO2), dry pressing forces and sintering temperatures are very important for preparation of structural ceramics. In the present study, density and Vickers hardness measurement, SEM, and XRD analysis were employed to investigate the effects of these on the final products. The relevant results showed that higher pressing force led to an increase in the density and Vickers hardness of the sintered

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25

Rejab, Nik Akmar, Zhwan Dilshad Ibrahim Sktani, Afifah Mohd Ali, and Zainal Arifin Ahmad. "Role of Ce₂Zr₃O₁₀ Phase on the Microstructure and Fracture Toughness of ZTA Composites." Materials Science Forum 840 (January 2016): 57–60. http://dx.doi.org/10.4028/www.scientific.net/msf.840.57.

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Despite the impressive development in understanding transformation toughening, tailoring the toughness of zirconia toughened alumina (ZTA) ceramics remained a major challenge. In our research, a simple route based on the powders mixing process of ZTA powders with varying CeO2 additions (0 - 10 wt.%) is developed to investigate this issue. The experimental results clearly reveal that the fracture toughness of ZTA ceramics can be tailored by mixing of ZTA starting powders.

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26

Rejab, Nik Akmar, Ahmad Zahirani Ahmad Azhar, Manimaran Ratnam, and Zainal Arifin Ahmad. "Structural and Microstructure Relationship with Fracture Toughness of CeO₂ Addition into Zirconia Toughened Alumina (ZTA) Ceramic Composites." Advanced Materials Research 620 (December 2012): 252–56. http://dx.doi.org/10.4028/www.scientific.net/amr.620.252.

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The effect of CeO2addition in zirconia toughened alumina (ZTA) was examined. The CeO2addition in weight percent (wt %) was varied from 0 wt% to 15 wt%. The fabricated samples were sintered at a temperature of 1600°C. The sintered samples were characterized their properties such as fracture toughness and phase determination. X-ray diffraction patterns confirm the constituent phases present in the samples were alumina and zirconia. Fracture toughness for each sample in the range of 5.878.38 MPam1/2respectively. It was observed that the addition of ceria increased the fracture toughness of the zi

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27

Ikeda, Junji, Takayuki Murakami, Takayoshi Shimozono, Reiji Watanabe, Mikio Iwamoto, and Takefumi Nakanishi. "Characteristics of Low Temperature Degradation Free ZTA for Artificial Joint." Key Engineering Materials 631 (November 2014): 18–22. http://dx.doi.org/10.4028/www.scientific.net/kem.631.18.

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Low temperature degradation free Zirconia toughened alumina (ZTA) has been developed. It is reported that ZTA has higher mechanical strength compared to alumina due to the stress induced transformation and spontaneously transformation of zirconia phase on some ZTA have been occurred. For achieving the higher reliability of artificial joint prosthesis alternative to alumina and other ceramic materials, it is necessary to improve and validate the both mechanical characteristics and phase stability at the same time. We evaluated that microstructure, mechanical characteristics and phase stability

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28

Yan, Yan Yan, Bo Zhao, and Jun Li Liu. "Research on the Fracture Phenomenon of Zirconia-Toughened Alumina Ceramics under Ultrasonic Vibration." Key Engineering Materials 455 (December 2010): 156–60. http://dx.doi.org/10.4028/www.scientific.net/kem.455.156.

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A study of the fracture phenomenon of zirconia-toughened alumina (ZTA) ceramics was carried. It analyzes the mechanisms of crack propagation of ZTA ceramics, and constructs fracture experiments of ZTA ceramics, so the propagation behavior on fracture in ZTA ceramics was investigated according to the experiment. By contrast, intercrystalline fracture happed in V-shaped groove of ceramic specimen under normal load without ultrasonic vibration during ceramic fracture, and transcrystalline fracture happed in V-shaped groove of ceramic specimen under normal load with ultrasonic vibration during cer

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29

Pezzotti, Marin, Zanocco, et al. "Osteogenic Enhancement of Zirconia-Toughened Alumina with Silicon Nitride and Bioglass®." Ceramics 2, no. 4 (2019): 554–67. http://dx.doi.org/10.3390/ceramics2040043.

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Alumina (Al2O3) ceramic implants do not stimulate osteoblasts in vivo. Surface alterations targeted at changing the chemistry or topography have been proposed to enhance the bioactivity of alumina. This surface modification is intended to improve oxide bioceramic’s ability to integrate with the biological environment and, in particular, to rapidly osteointegrate. In this study, the surface of zirconia-toughened alumina (ZTA) was functionalized using two methods: (i) Surface laser-patterning and successive filling of patterned wells with powder mixtures of bioglass and Si3N4; and, (ii) Si3N4 co

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30

Oberbach, Thomas, Sabine Begand, and Christian Kaddick. "Surface Resistance of Dispersion Ceramics against Third Body Abrasion." Key Engineering Materials 396-398 (October 2008): 161–64. http://dx.doi.org/10.4028/www.scientific.net/kem.396-398.161.

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Wear of the articulation partners in artificial joints for hip or knee is known to influence the in vivo survival rate of the implants. Wear amount can be strongly increased if third body wear occurs in the joint gap. Alumina ceramic is noted for a good wear resistance even under these worst case conditions. We tested the wear behaviour of the new dispersion ceramics ZTA (Zirconia Toughened Alumina) and ATZ (Alumina Toughened Zirconia) in comparison to alumina for the couplings ceramic on PE and ceramic on ceramic in a hip joint simulator in presence of third body particles.

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Kerkwijk, B., A. J. A. Winnubst, A. F. Stassen, and H. Verweij. "Zirconia-Toughened Alumina (ZTA) with Improved Homogeneity for Tribological Applications." Key Engineering Materials 132-136 (April 1997): 297–300. http://dx.doi.org/10.4028/www.scientific.net/kem.132-136.297.

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32

Llopis, J., and S. E. Paje. "Characterization of Zirconia-Toughened Alumina (ZTA) ceramics by SEM-cathodoluminescence." Journal of Physics and Chemistry of Solids 54, no. 8 (1993): 951–54. http://dx.doi.org/10.1016/0022-3697(93)90223-e.

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Herrmann, Mathias, Björn Seipel, Jochen Schilm, Klaus G. Nickel, Grit Michael, and Andreas Krell. "Hydrothermal corrosion of zirconia-toughened alumina (ZTA) at 200°C." Journal of the European Ceramic Society 25, no. 10 (2005): 1805–12. http://dx.doi.org/10.1016/j.jeurceramsoc.2004.12.009.

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34

Ikeda, Junji, Takayuki Murakami, T. Sasaki, T. Shimozono, Y. Shouyama, and M. Iwamoto. "Wear and Corrosion Resistance of Low Temperature Degradation Free ZTA for Artificial Joint." Key Engineering Materials 720 (November 2016): 296–300. http://dx.doi.org/10.4028/www.scientific.net/kem.720.296.

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Low-temperature-degradation-free (LTD-free) zirconia-toughened alumina (ZTA) has been developed as an alternative to alumina and zirconia. It has been reported that ZTA has more beneficial mechanical characteristics than alumina, because of the stress-induced transformation and the spontaneous transformation of the zirconia phase that occurs for some ZTA in a hydrothermal environment. To achieve high-reliability artificial-joint prostheses, it is necessary to improve both the mechanical characteristics and phase stability of the joint material simultaneously. Thus, in this study, we evaluate t

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35

Arab, Ali, Zhwan Sktani, Qiang Zhou, Zainal Ahmad, and Pengwan Chen. "Effect of MgO Addition on the Mechanical and Dynamic Properties of Zirconia Toughened Alumina (ZTA) Ceramics." Materials 12, no. 15 (2019): 2440. http://dx.doi.org/10.3390/ma12152440.

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Zirconia toughened alumina (ZTA) is a promising advanced ceramic material for a wide range of applications that are subjected to dynamic loading. Therefore, the investigation of dynamic compressive strength, fracture toughness and hardness is essential for ZTA ceramics. However, the relationship between these mechanical properties in ZTA has not yet been established. An example of this relationship is demonstrated using ZTA samples added with MgO prepared through conventional sintering. The microstructure and mechanical properties of ZTA composites were characterized. The hardness of ZTA compo

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36

Ahmad Azhar, Ahmad Zahirani, Mokhzani Mokhtar, Mani Maran Ratnam, and Zainal Arifin Ahmad. "Effects of TiN Single Layer Coating on the Wear of ZTA Cutting Inserts and Surface Roughness of Workpiece." Materials Science Forum 888 (March 2017): 52–56. http://dx.doi.org/10.4028/www.scientific.net/msf.888.52.

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Single layer TiN coated and uncoated zirconia toughened alumina (ZTA) cutting inserts were fabricated and used to machine stainless steel 316 in a turning process. The powders of alumina, yttria partially stabilized zirconia and magnesia were mixed and uniaxially pressed into rhombic cutting tool inserts and subsequently sintered at 1600°C for four hours in air. The inserts were coated with TiN layer using the PVD process. Results of wear area illustrate that the coated ZTA inserts show 66.7% increase in wear resistance compared to uncoated ZTA inserts. Commercially available Si3N4 inserts wer

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Teow, Hsien Loong, Sivakumar Sivanesan, Se Yong Eh Noum, Ananthan Soosai, and Suresh Muniandy. "Effect of Graphene-Oxide Addition on the Microstructure and Mechanical Properties of Two-Stage Sintered Zirconia-Toughened Alumina (ZTA) Composites." MATEC Web of Conferences 335 (2021): 03019. http://dx.doi.org/10.1051/matecconf/202133503019.

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United Nations has estimated that 130 million people would suffer from osteoarthritis worldwide by 2050. This disease would require patients to undergo a surgery known as Total Hip Replacement (THR) which has a failure rate of approximately 1 % with a lifespan of 20 years. The biomaterials used to manufacture this total hip artroplasty are mainly made of Zirconia-Toughened Alumina. In this work, Zirconia Toughened Alumina (ZTA) composites with 10 vol% Y-TZP content were doped with small amount (0.01 to 1 wt%) of graphene oxide (GO). The GO-doped ZTA composites were produced via two-stage sinte

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Bartolomé, J. F., G. Bruno, and A. H. DeAza. "Neutron diffraction residual stress analysis of zirconia toughened alumina (ZTA) composites." Journal of the European Ceramic Society 28, no. 9 (2008): 1809–14. http://dx.doi.org/10.1016/j.jeurceramsoc.2007.12.037.

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Pfeifer, Stephanie, Pinar Demirci, Rueya Duran, et al. "Synthesis of zirconia toughened alumina (ZTA) fibers for high performance materials." Journal of the European Ceramic Society 36, no. 3 (2016): 725–31. http://dx.doi.org/10.1016/j.jeurceramsoc.2015.10.028.

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Exare, C., J. M. Kiat, N. Guiblin, and V. Petricek. "Mechanical Properties of ZTA: Correlation with Structural Properties and Influence of Ageing." Journal of Ceramics 2016 (June 8, 2016): 1–7. http://dx.doi.org/10.1155/2016/4264062.

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We report the mechanical and thermal properties of industrial Zirconia Toughened Alumina (ZTA) composites for different compositions of zirconia and yttria, paying a special attention to possible ageing. As a result a correlation between the structural properties and the in-fine performances is obtained; in particular, depending on mechanical properties expected by the customer, optimum composites compositions are indicated.

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Veselov, Sergey, N. Yu Cherkasova, and R. S. Timarevskiy. "The Influence of Zirconia Powder Dispersion Technique on Microstructure and Properties of Al₂O₃ – ZrO₂ Ceramic." Applied Mechanics and Materials 682 (October 2014): 109–12. http://dx.doi.org/10.4028/www.scientific.net/amm.682.109.

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The results of microstructure and mechanical properties investigation for alumina and zirconia toughened alumina (ZTA) with 20 wt. % 3Y-ZrO2is presented. It was stated that the technique of preliminary treatment for zirconia suspension makes significant influence on sintered specimen microstructure. Introduction of the alloying additive treated with ball milling reduces Al2O3grain size in ceramic from 2-5 μm to 0.2-1 μm. The reduction of grain size increases the bending strength of ceramic material from 270 MPa up to 350 MPa. However fracture toughness of alumina and ZTA is 3.4 and 2.5 MPa·m1/

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Nor Hakim, H. M., R. M. Ikhwan Zaini, Z. A. Ahmad, Mohd Mustafa Al Bakri Abdullah, A. Bakir Azman, and M. Mazlan. "Machining Performance of Reinforced Alumina Insert in End Milling of AISI 1018 Steel." Advanced Materials Research 795 (September 2013): 597–602. http://dx.doi.org/10.4028/www.scientific.net/amr.795.597.

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The main goal of this work is to investigate the performance of zirconia toughened alumina (ZTA) and ZTA reinforced with magnesium oxide (MgO) used as cutting insert in end milling of AISI 1018 steel with hardness of 27 HRC. Performances of the cutting insert were compared according to tool life and surface finish of workpiece. Insert flank wear that indicates tool life was studied carefully using Optical 3D Surface Metrology while surface roughness values were evaluated using Surftest Sufrcom 130A. The cutting inserts failed to exhibit good performance in end milling operation. However, wear

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Jang, Kyung Hun, and Bum Rae Cho. "Influence of Zircon Addition on Thermal Shock Resistance of ZTA for Plasma Reactors." Materials Science Forum 544-545 (May 2007): 379–82. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.379.

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The effect of CaO, MgO and SiO2 as a flux on the sinterability of zirconia toughened alumina(ZTA) used for plasma reactors was investigated and the effect of zircon addition on thermal shock resistance of ZTA with 15wt.% of ZrO2 was also investigated. The resultant data revealed that ZTA shows the best sinterability at the composition of 2wt.% of CaO, 4wt.% of MgO and 2wt.% of SiO2 and at the sintering temperature of 1350°C. Thermal shock resistance of ZTA containing zircon was improved significantly. It is shown that ZTA containing 10wt.% of zircon shows better thermal shock resistance than o

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Díaz, Luis Antonio, Sergio Rivera, Adolfo Fernández, Anna Okunkova, Yu G. Vladimirov, and Ramon Torrecillas San Millan. "Mechanical Behavior of Alumina Toughened Zirconia Nanocomposites with Different Alumina Additions." Advances in Science and Technology 96 (October 2014): 61–66. http://dx.doi.org/10.4028/www.scientific.net/ast.96.61.

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ZrO2 and Al2O3 are monolithic ceramics used today in a wide variety of structural components. However, both materials present important drawbacks for some specific applications. In the case of Al2O3, its moderate strength (500 MPa) and toughness (4 MPa.√m) makes it unsuitable for high loading conditions. On the other hand, ZrO2 presents higher strength and toughness values (900 MPa and 6 MPa.√m) than Al2O3 but it is a material limited in its long-term behaviour due to its bad response to hydrothermal ageing and a pronounced tendency for subcritical crack growth. Due to this fact, ceramic nanoc

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Yan, Yan Yan, Bo Zhao, and Jun Li Liu. "Study on Surface Residual Stress of Nano-Zirconia Toughened Alumina Ceramics under Two-Dimentional Ultrasonic Vibration Assisted Grinding." Advanced Materials Research 126-128 (August 2010): 143–47. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.143.

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Based on good processing property of two-dimentional ultrasonic vibration assisted grinding (TUVAG), the precision finishing of nano-zirconia toughened alumina ceramics (nano-ZTA) is carried out. According to theoretical analysis, TUVAG may obtain higher machining efficiency and better surface quality. Especially, experimental results show it may obtain the compressive stress in the finished surface of nano-ZTA that may restrain the expansion of surface microcrack, and surface residual stress of nano-ZTA under TUVAG differs from that under diamond grinding, and TUVAG may obtain the better surf

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Liu, Juan, Long Hao Qi, Hong Yuan Xu, and Xian Wu Luo. "Erosive Wear Performance and Mechanism of Engineering Ceramic Materials." Key Engineering Materials 336-338 (April 2007): 2462–64. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.2462.

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A slurry pot tester was used to evaluate the erosion behavior of alumina (Al2O3), zirconia toughened alumina (ZTA), and silicon nitride ceramics. The eroded surface of sample was studied by scanning electronic microscope and the primary erosion wear mechanisms for ceramic materials were analyzed. On the same experimental condition, erosion wear resistance of materials follows this rule: Si3N4>ZTA>Al2O3. The key factor affecting erosive wear performance of ceramics is their microstructure. The primary erosive wear mechanisms for Al2O3, ZTA and Si3N4 ceramics are lateral crack propagation,

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Oberbach, Thomas, Sabine Begand, Wilfried Glien, and Christian Kaddick. "Investigation of Aged Dispersion Ceramics by Means of Hip Simulator." Key Engineering Materials 361-363 (November 2007): 771–74. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.771.

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Wear of hip implants is a significant problem for the life expectancy of artificial joints. By using alumina ceramic on ceramic couplings the wear can be decreased. But for further improvement of the safety of THR the aim is the development of new ceramic materials. For orthopaedic applications an Alumina Toughened Zirconia Ceramic ATZ (80% ZrO2-20%Al2O3) and a Zirconia Toughened Alumina ZTA (25% ZrO2-75%Al2O3) were tested regarding their tribological behaviour by means of hip simulator testing after hydrothermal treatment. The absolute wear amount for the aged samples after 5 million cycles i

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Zhang, Ming, Chun Xiao Liu, Bo Zhao, Guo Fu Gao, and Yu Li. "Experimental Study on the Big Nano-Ceramic Plates under Two-Dimensional Ultrasonic Polishing." Key Engineering Materials 392-394 (October 2008): 146–450. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.146.

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The two-dimensional ultrasonic polishing device of big nano-ceramic plate was designed and its maximum value of vibration amplitude reached 18.34um.Using it to polish the nano-zirconia toughened alumina ceramic(ZTA) plates 500mm×400mm×16mm, the polishing efficiency improves and the polishing surface roughness achieves below 0.07um, flatness below 10um.

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Loong, Teow Hsien, Ananthan Soosai, and Suresh Muniandy. "Densification Behaviour and Mechanical Properties on MgO Doped Zirconia Toughened Alumina (ZTA) Prepared by Two-Stage Sintering." Materials Science Forum 1030 (May 2021): 3–10. http://dx.doi.org/10.4028/www.scientific.net/msf.1030.3.

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The effect of doping small amounts of Magnesium Oxide ranging between 0 to 1 vol% on Zirconia Toughened Alumina (ZTA) composites which is one of main biomaterial used for production of total hip arthroplasty were investigated. The samples were produced via conventional two-stage sintering with T1 varies between 1450°C and 1550°C with heating rate of 20°C/min. The samples were then rapid cooled to T2 set at 1400°C with holding time of 12 hours. The microstructural and mechanical properties of the two-stage sintered ZTA are then investigated to determine the feasibility of MgO addition. Combinat

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Naga, S. M., A. M. Hassan, and M. Awaad. "Physical and mechanical properties of Ta2O5 doped zirconia-toughened alumina (ZTA) composites." Ceramics International 41, no. 5 (2015): 6248–55. http://dx.doi.org/10.1016/j.ceramint.2015.01.039.

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