Isothermal and nonisothermal sintering are studied for castings based both on fuzed quartz suspensions with different fineness, and cast systems with a granular filler based on them. An effect is detected of considerable sintering of the test materials in the specimen heating stage (nonisothermal sintering) up to a final firing temperature of 1250°C. Depending on original specimen solid phase dispersion and particle grain size composition for the majority of materials their optimum properties are achieved after isothermal exposure for 0.5 – 1.0 h at 1250°C. Although exceeding it is accompanied by a certain reduction in porosity, it is connected with material weakening in view of the initial stage of christobalitization.
Refractories and Industrial Ceramics – Springer Journals
Published: Aug 7, 2015
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