Papers by Keyword: Refractory

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Authors: M.S. Başpınar, Wolfgang Schulle, Ferhat Kara
Authors: Xi Gao Peng, Jia Lin Sun, Gan Shi, Shao Ping Huang
Abstract: Based on an extensive comparison of test methods for abrasion resistance from home and abroad, a new technique for abrasion resistance at elevated temperature has been developed with some improvements. Two connected airtight chambers are designed to prevent compressed air from entering the sample chamber, so that heat loss of the sample chamber can be reduced and the chamber temperature is less disturbed. The sample surface temperature can reach stable within 5 min and the temperature fluctuation on sample surface can be less than 20°C in the course of inleting the compressed air at working temperatures up to1400°C. The repeatability was tested using float-glass plate as reference sample at ambient temperature and using high alumina bricks for elevated temperature. A variation coefficient under 7% at ambient temperature has been achieved. Comparison of abrasion resistance at elevated temperature was tested respectively on a high alumina brick and on a silicon nitride bonded silicon carbide brick and the results could be significantly distinguished. Nitrogen can be blown into sample chamber during heating the furnace to prevent nonoxide bearing samples from being oxidized.
Authors: Fu Gao, Ran Liu, Xing Juan Wang
Abstract: MgAlON is a new type of refractory material. This article summarized the advantages and disadvantages of the preparative technique through different methods including aluminothermic reduction, carbothermal reduction-nitridation, reaction sintering, spark plasma sintering and so on. The future development was also discussed.
Authors: Carole Sultan
Authors: Jacques Poirier
Abstract: Corrosion by liquid oxides is one of the most severe modes of degradations which limit the lifetime of the refractory linings. The study of the microstructures of corroded refractories provides essential information. However, the interpretation of the microscopic observations is difficult : - The refractories are multi-component and heterogeneous ceramics, - The microscopic observations are carried out at room temperature. They are not representative of the mineral and vitreous phases existing at high temperature, - During cooling, new solid phases appear by crystallization of liquid oxides. The composition of the vitreous phases also evolves with the temperature. Consequently, the information obtained is often limited. In this paper , we will present a method to analyse and interpret the microstructures of refractories after use. The concept of local thermodynamic equilibrium and the use of the phase rule make it possible to interpret the microstructures of corroded refractories, to explain the observed mineral zonation and to quantify the composition of the liquid phase at high temperature from chemical profiles established by S.E.M. Experimental data from corrosion of MgO-C, Al2O3-MgO and high alumina refractories will illustrate and validate this theoretical approach.
Authors: Shigeru Hanzawa
Authors: Xiao Hua Liu, Xing Dong Lv, Jian Xia Fu, Peng Peng, Guo Sheng Gai
Abstract: Silica fume is the dust recovered from the smoke released while smelting Si or Si-Fe alloy. The papers gives an overview of silica fume application in concrete, refractory, metallurgy and cement in China, along with some projects as examples; To contrast the situation at abroad, the producing, application, and price of silica fume in China was analyzed, and base on this predicted the future market. It is significant to promote deep research and application for silica fume.
Authors: P. Popper
Authors: I. Birkby, Ron Stevens
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