Relevant bibliographies by topics / Corundum – Analysis

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  2. Dissertations / Theses
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Academic literature on the topic 'Corundum – Analysis'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Corundum – Analysis"

1

Ren, Xue Hua, Ping Zhao, Qi Hui Lai, and Xuan Qin. "Analysis to Mullite Bonded Corundum Purging Plug." Applied Mechanics and Materials 423-426 (September 2013): 49–52. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.49.

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We chose a purging plug with good performance to analyze its insert plate. By X ray fluorescence analysis method, the main chemical composition is alumina and the small amount is silica. XRD analysis shows its phase compositions, main crystal phase is corundum, the secondary phase is mullite. SEM analysis is for the microstructure, grains are packed closely. They are sintered tabular corundums with smooth shape, which means there is liquid phase in sintering process to help mass transfer. As a conclusion, this product is designed from the point of material selection and structure control to improve its thermal shock resistance. Compacted microstructure combining with good thermal shock-resistance mineral phases improve the service life of purging plug.
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Ding, Cheng Dong, Gang Zhang, and Jian Hong Yang. "Properties Analysis of Corundum Castables and Corundum MA Spinel Castables." Key Engineering Materials 544 (March 2013): 316–20. http://dx.doi.org/10.4028/www.scientific.net/kem.544.316.

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Due to its excellent properties and good workability, castables is widely used in metallurgical field especially in steel and nonferrous metallurgical industry. In this article, we mainly had a comparative analysis of corundum castables and corundum MA spinel castables with 15% and 30% MA spinel addition . The physical and mechanical properties such as the bulk density, apparent porosity, cold modulus of rupture, cold crushing strength and thermal shock resistance of samples were studied after different temperature heating treated at 110°C×24h, 1100°C×3h and 1400°C×3h, respectively. The thermal conductivity of different samples at 750°C were tested by plate heat conduction method, phase composition and microstructure of samples with 15% MA spinel addition after different temperature heating treated were tested by XRD and SEM respectively. The results showed that: the properties of corundum MA spinel castables with 15% MA spinel addition is relatively good, the corundum castables take second place, samples with 30% MA spinel addition showed the worst performance among the three. After the heating treatment at 1400°C×3h, the CCS and CMOR of the samples is higher than that of 110°C×24h and 1100°C×3h due to the CA6 formation. Coefficient of thermal conductivity of the corundum-based castables at 750°C is relatively higher compared with that of 15% and 30% MA addition, reaches at 1.260w/ (m.k).
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Lukin, E. S., N. A. Makarov, Yu M. Mosin, and E. A. Oleinik. "Analysis of corundum ceramics strength." Glass and Ceramics 56, no. 5-6 (May 1999): 154–57. http://dx.doi.org/10.1007/bf02681323.

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Thuyết, Nguyễn Thị Minh, Ngụy Tuyết Nhung, and Nguyễn Ngọc Khôi. "NGUỒN GỐC VÀ ĐIỀU KIỆN THÀNH TẠO CỦA CORINDON TRONG ĐÁ GNEIS MỎ TRÚC LÂU, HUYỆN LỤC YÊN, TỈNH YÊN BÁI." VIETNAM JOURNAL OF EARTH SCIENCES 33, no. 1 (December 21, 2011): 55–62. http://dx.doi.org/10.15625/0866-7187/33/1/277.

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Origin and forming conditions of corundums in gneiss in Truc Lau mine, Luc Yen District, Yen Bai ProvinceTruc Lau gem mining area, belonged to Truc Lau, Phuc Loi commune of Luc Yen district, Yen Bai province, islocated in the Red River zone. Here, corundums (ruby, sapphire) have been exploited in placer since the late 80s of the last century. In recent years, they have been found in gneiss host rock. Based on the results of chemical composition, crystal structure, inclusion, color, absorption spectrum of corundum as well as mineral assemblage analysis and thermobarometer confirmed that corundums from Truc Lau gneiss are the production of metapelite and formed by breaking down of muscovite at 650-769oC, 7.6-5.2kbar.
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Skidin, Ihor, Oksana Vodennikova, Sergii Vodennikov, Levan Saithareiev, and Shamil Telkov. "Parameter analysis of non-metallic inclusion formation in thermite alloys." E3S Web of Conferences 280 (2021): 07015. http://dx.doi.org/10.1051/e3sconf/202128007015.

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The methodology of calculating parameters of the primary and secondary non-metallic inclusion formation in thermite alloys is offered. The regularities of the growth time of non-metallic inclusion in the form of corundum depending on its size, mass and quantity are analysed. It is shown that in the thermite alloy obtained by self-propagating high-temperature synthesis, the average size of corundum inclusions, surrounding the heterogeneous inclusions of chromium carbide, is 15.4 μm. It is shown that during the process of aluminothermic reactions of the SHS process a significant number of small inclusions of corundum is formed. It is shown that the alumina particles are dissolved in the alloy and they are the centers of crystallization and play the role of inoculating modifier.
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Wang, Ning. "Characteristics Analysis of Plane Processing of Sapphire Corundum Crystals." Advanced Materials Research 706-708 (June 2013): 20–23. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.20.

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In order to solve the problems of plane processing of the sapphire corundum crystals, an orthogonal test design was put forward to investigate the key factors that influencing the quality of grinding and polishing, and the optimal plane processing parameters were obtained by visual analysis. The samples of the sapphire corundum crystals were processed using the optimal plane processing parameters, and the surface roughness was also detected using Mahr roughness instrument, the test results show that the plane quality is improved dramatically.
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Yang, Huan Ying, Yong Li, Shu Long Liu, Chang He Gao, Shu Long Ma, and Lin Jun Wang. "Sintering Characters Analysis of the Al2O3-86 Homogenized Bauxite." Advanced Materials Research 690-693 (May 2013): 35–39. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.35.

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The present explains sintering characters of the Al2O3-86 homogenized bauxite under wet processes homogenization, which includes classified bauxite mine, wet grinding, vacuum extrusion, sintering in tunnel kiln,etc. DSC and TG reveal an evident peak of absorption heat at 531°C, resulting from the dehydroxylation of bauxite. Green samples held at 550°C*6hrs were heated up to different temperatures, and the properties of weight loss, linear change, bulk density and apparent porosity were measured. The data show that liquid-phase emerge and sintering process goes slowly above 1100°C. At 1500°C, large amounts of liquid-phase form, making liquid-phase sintering have a positive effect. The analysis of XRD and SEM indicate that, corundum grains develop more inadequate and most of the corundums interlace in a compact way, which can separate the widespread liquid phase and improve the sintering capability of homogenized bauxite.
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Li, D. Y., and B. H. O'Connor. "A Multi-Line Standardless Method for X-Ray Powder Diffraction Phase Analysis." Advances in X-ray Analysis 35, A (1991): 105–10. http://dx.doi.org/10.1154/s0376030800008727.

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AbstractQuantitative phase analysis (QPA) methods which employ only one diffraction line for each phase arc generally unreliable due to the influence of systematic errors such as preferred orientation and extinction. Gazzara and Messier (1977) proposed a multi-line QPA method using normalised line intensities for line j of phase i,where Iij = measured Bragg intensity, m = multiplicity, Lp = Lorentz-polarisation factor, |F| = structure amplitude and Vi = cell volume. The method proposed here is a refinement of the Gazzara-Messier procedure. Phase compositions are calculated directly from the mean normalised Intensity for resolved lines which span the 2θ range of the instrument. The method makes use of the variance in to estimate standard deviations for the phase compositions. Test results are given for binaries of corundum-quartz and corundum-ceria.
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Yaitskiy, Serhiy, Liudmyla Bragina, and Yuliya Sobol. "Analysis of the Bacor Refractories after their Service in Glass Furnace." Chemistry & Chemical Technology 10, no. 3 (September 15, 2016): 373–77. http://dx.doi.org/10.23939/chcht10.03.373.

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The degree of the baddeleyite-corundum refractories erosion depending on the areas of their location in the glass-making furnace in the float glass production was established. With the use of petrographic analysis the influence of chemical and mineral composition and also temperature and gas environment on corrosion of bacor linings was studied. Due to obtained results the recommendations in relation to the increase of glass-attack resistance of the furnace and its service life length were formulated.
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Raab, G. A. "Semiquantitative Analysis by X-Ray Powder Diffraction (SQXRD) of the < 2 mm to 0.002 mm and < 0.002 mm Fractions of Soil." Powder Diffraction 3, no. 3 (September 1988): 144–52. http://dx.doi.org/10.1017/s0885715600032875.

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AbstractThe method described in this paper is a strict protocol for X-ray diffraction (XRD) analysis of mineral phases found in soils. Its application is not restricted to soils and is an attempt to standardize XRD sample preparation and analysis. The protocol requires the particle size of the < 2 mm - 0.002 mm fraction be reduced to 0.002 mm before analysis. In die qualitative section, the clay fraction ( < 0.002 mm particle size) is prepared as oriented slides. The suspended clay fraction is saturated with ethylene glycol, K +, and Mg+2; pipeted; air-dried; heat-treated at 110°C, 350°C, and 550°C; and X-rayed at each step in order to properly identify the clay minerals. In the quantitative section, the method employs a matrix-flushing agent, corundum (Al2O3). The corundum acts also as an internal standard, a calibration standard, and a reference standard. The suspended clay fraction is freeze-dried and corundum is added to each sample. Randomly oriented powder mounts are prepared from the < 2 mm - 0.002 mm fraction, and the < 0.002 mm fraction, and X-rayed. A series of reference standards are prepared based on the existing mineralogy, corundum is added, and each mixture is X-rayed. The software integrates the area under specific peaks (chosen for intensity and no overlap) in each sample, calculates the reference intensity ratios (RIRs) and calculates the percentage of each mineral based on the equation of Chung (1974). The attention to detail allows documentation and verification of the results yielding data of known quality.
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Dissertations / Theses on the topic "Corundum – Analysis"

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Collins, Marc Kevin. "The use of diffuse reflectance infrared spectroscopy in the study of alumina." 1986. http://hdl.handle.net/2097/27609.

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Books on the topic "Corundum – Analysis"

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Marchandise, H. Characterisation of corundum (RM 300) and mullite (RM 301) as reference materials for X-ray diffraction analyses. Luxembourg: Commission of the European Communities, 1985.

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Ltd, ICON Group. RIKEN CORUNDUM COMPANY LTD.: Labor Productivity Benchmarks and International Gap Analysis (Labor Productivity Series). 2nd ed. Icon Group International, 2000.

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Ltd, ICON Group. RIKEN CORUNDUM COMPANY LTD.: International Competitive Benchmarks and Financial Gap Analysis (Financial Performance Series). 2nd ed. Icon Group International, 2000.

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Book chapters on the topic "Corundum – Analysis"

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Valvoda, V., D. Rafaja, and R. Jenkins. "Results of X-Ray Powder Diffraction Round Robin Tests with Corundum Plates and Powder Samples." In Advances in X-Ray Analysis, 571–77. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5377-9_62.

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Conference papers on the topic "Corundum – Analysis"

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Setiawan, Jan, Slamet Pribadi, Ganisa Kurniati Suryaman, and M. H. Al Hasa. "Structural analysis on in situ high-temperature XRD of corundum." In PROCEEDINGS OF THE 4TH INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2020): Accelerating Research and Innovation on Metallurgy and Materials for Inclusive and Sustainable Industry. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0059971.

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Li Zhengmin, Zhai Han, and Tan Min. "Particle shape characterization of brown corundum powders by SEM and image analysis." In International Technology and Innovation Conference 2006 (ITIC 2006). IEE, 2006. http://dx.doi.org/10.1049/cp:20060969.

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Zhang, Yang-Fei, Min Miao, Yu-Feng Jin, and Shu-Lin Bai. "Microstructure and Strength of Low Temperature Co-Fired Ceramic Substrates With Channels and Cavities." In 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2008. http://dx.doi.org/10.1115/micronano2008-70040.

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The effect of embedded channels and cavities on the strength of LTCC substrates has been investigated by experiments, theoretical analysis and finite element analysis (FEA) simulation. The fracture behaviors characterized by flexural strength were measured by three-point bending tests and discussed according to the features of the microstructure, which was studied by Scanning Electron Microscope, Energy Spectrum Analysis and X-Ray Diffraction methods. The experimental results show that X and Y-axial channels have little effect on the flexural strength while Z-axial via-hole will greatly lower the strength due to the stress concentration. Two distinct components were observed: particles composed of synthetic corundum and matrix composed of corundum, silica, aluminum, and sodium calcium aluminum silicate. The FEA simulation gave similar results to the experiments and theoretical calculations and proved to be an effective method to predict possible condition of the fracture on substrates with complex internal structures.
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Dmitriev, Serge A., Olga K. Karlina, Vsevolod L. Klimov, Micheal I. Ojovan, Galina Yu Pavlova, and Andrew Yu Yurchenko. "Retention Properties of Carbide-Corundum Ceramics Containing Carbon-14, Caesium-137, and Strontium-90." In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4567.

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The system C–Al–TiO2 is of considerable interest for the processing of irradiated reactor graphite waste with the retention of biologic hazardous carbon-14. Investigations of this system were conducted both theoretically and experimentally. Previously, the thermodynamic calculations of the phase composition of resulting end product were performed for a wide variety of components content in the system being investigated. These simulation results have been supported by XRD-analysis of produced specimens. The experimental processing of reactor graphite was conducted by the use of self-sustaining reactions in C–Al–TiO2 mixtures. A search of modifier additives was performed to perfect end product properties. Test specimens were produced by mass ranging from 0.2 to 3 kg in the argon atmosphere. Various techniques were applied to characterize the produced specimens. The compressive strength of specimens of doped carbide-corundum matrices synthesized ranged from 7 to 18 MPa. The carry over of Cs-137 and Sr-90 during synthesis reaction was about 3% wt. The leachability attained of Cs-137 and Sr-90 from specimens was around 10−5 g/(cm2.day). The carbon-14 is combined in the end product in chemically and thermic stable titanium carbide. The carry-over of the carbon combined in carbon monoxide from the reacting mixtures during exothermic process was less than 1% wt. This corresponds roughly to up 0.01% wt. of the carbon-14 inventory, which can be present in the irradiated reactor graphite.
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Sitdikov, Vil Dayanovich, Artyom Anatolyevich Nikolaev, Ekaterina Alekseevna Kolbosenko, Grigoriy Vladimirovich Ivanov, Artyom Konstantinovich Makatrov, and Andrey Vladimirovich Malinin. "The Features of X-Ray Phase Analysis of Rocks with Complex Mineral Composition." In SPE Symposium: Petrophysics XXI. Core, Well Logging, and Well Testing. SPE, 2021. http://dx.doi.org/10.2118/208448-ms.

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Abstract The article presents the results of identification and quantitative analysis of the phase composition, fine structure parameters of minerals in carbonate and terrigenous rocks by the use of modern X-ray diffraction (XRD) analysis. To make the XRD analysis, we optimized the modes of x-ray pattern shooting by changing the radius of the goniometer, the system of primary and secondary slits, Soller slits, and the system of detecting the low-content minerals. In processing the obtained x-ray patterns, we considered the size and defects of the crystal grains, the crystallographic mode of arrangements, atomic population of the crystal lattice, the Debye-Waller factor and the instrumental line broadening by the use of the Caliotti function for LaB6. So we determined the type and content of minerals, estimated the period of the crystal lattice, the size of the coherent scattering domains and micro-distortion crystal lattice of the mineral. We compared the obtained data on the presence and quantitative content of minerals with the data of X-ray fluorescence (XRF) analysis and scanning electron microscopy (SEM). Based on the obtained data, reference intensity ratio (RIR) coefficients were selected for a number of minerals typically contained in core materials for quantitative phase analysis by the use of the corundum number method.
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Turnier, Rachelle B., Yaron Katzir, Kouki Kitajima, I. J. Orland, M. J. Spicuzza, and John W. Valley. "IN SITU VERSUS BULK ANALYSES OF OXYGEN ISOTOPE RATIOS: IMPROVED THERMOMETRY FOR CORUNDUM AND CALCITE AT NAXOS, GREECE." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-279011.

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Dobrovska, Jana, Frantisek Kavicka, Karel Stransky, Vera Dobrovska, Josef Stetina, and Jaromir Heger. "Two Numerical Models for Optimization of the Foundry Technology of the Ceramics EUCOR." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56144.

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Corundo-baddeleyit material — EUCOR — is a heat- and wear-resistant material even at extreme temperatures. This article introduces a numerical model of solidification and cooling of this material in a non-metallic mould. The model is capable of determining the total solidification time of the casting and also the place of the casting which solidifies last. Furthermore, it is possible to calculate the temperature gradient in any point and time, and also determine the local solidification time and the solidification interval of any point. The local solidification time is one of the input parameters for the cooperating model of chemical heterogeneity. This second model and its application on samples of EUCOR prove that the applied method of measurement of chemical heterogeneity provides detailed quantitative information on the material structure and makes it possible to analyse the solidification process. The analysis of this process entails statistical processing of the results of the measurements of the heterogeneity of the components of EUCOR and performs correlation of individual components during solidification. The crystallisation process seems to be very complicated, where the macro- and microscopic segregations differ significantly. The verification of both numerical models was conducted on a real cast 350 × 200 × 400 mm block.
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Kavicka, Frantisek, Jana Dobrovska, Karel Stransky, Bohumil Sekanina, and Josef Stetina. "Numerical Optimization of the Casting of Ceramic Material EUCOR." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44058.

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Corundo-baddeleyit material (CBM) – EUCOR – is a heat- and wear-resistant material even at extreme temperatures. This article introduces a numerical model of solidification and cooling of this material in a non-metallic mold. The model is capable of determining the total solidification time of the casting and also the place of the casting which solidifies last. Furthermore, it is possible to calculate the temperature gradient at any point and time, and also determine the local solidification time and the solidification interval of any point. The local solidification time is one of the input parameters for the cooperating model of chemical heterogeneity. This second model and its application on EUCOR samples prove that the applied method of measuring the chemical heterogeneity provides the detailed quantitative information on the material structure and makes it possible to analyze the solidification process. The analysis of this process entails statistical processing of the measurement results of the heterogeneity of the EUCOR components and performs the correlation of individual components during solidification. The verification of both numerical models was conducted on a real cast 350 × 200 × 400 mm block.
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