Mazumder, Sujata and Mukherjee, B and Basu, M K (1993) Quantitative estimation of crystalline phases of cordierite-mullite-based kiln furniture by X-ray diffraction method. Transactions of the Indian Ceramic Society, 52 (5). pp. 159-162. ISSN 0371-750X

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Thermal endurance of ceramics as refractory support is closely related to the crystalline phases present. In the alumino-silicate refractory family, cordierite-mullite system, produced by using commercially available raw materials, offers an attractive proposition up to a temperature range of 1280°C. Cordierite body formed in situ with high expansion grog as additives contains the following crystalline phases: (i) cordierite; (ii) mullite; (iii)α-Al2O3; (iv) cristobalite and (v) quartz. Of these, only the first three phases are relevant in enhancing the life cycle of kiln furniture vis-a-vis their thermal endurance. Hence a quantitative phase analysis is necessary to predict the life of kiln furniture and improve upon their performance. The present method of quantitative phase analysis is applicable where the crystal structure of the component phase whose proportionate analysis in a phase mixture is required, is known. Simulated intensity patterns based on the crystallographic data, viz. space group symmetry, lattice parameters, positional coordinates of various atoms and their occupancy factors, crystal density etc, were prepared for each reflection zone. Relevant computer programmes were developed at CGCRI. The intensity data collected in different 2θ zones were used for finding the volume concentrations of different phases. The error in quantitative estimation of phases was nearly 6% when the diffraction data were taken using monochromatic X-radiation. The chemical analysis corroborates this result. The materials contained a certain amount of glassy phase. Assuming that the glassy phase was composed mainly of silica glass along with other impurities, the result showed that only 85% of the total phase was crystalline and the remaining part was amorphous.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 30 Aug 2013 08:22
Last Modified: 05 Mar 2016 14:00

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