Thermal shock-resistant alumina-mullite composite material and preparation method thereof

摘要

A thermal shock-resistant alumina-mullite composite material and a preparation method thereof which are capable of concurrently obtaining the compactness of the material and a mullite formation. The material is comprised of 4 DIFFERENCE 30 weight % of one aluminum silicate selected from the group consisting of kaolinite, silimanite, and kyanite, 75 DIFFERENCE 94 weight % of Al2O3 based on the total amount of Al2O3, and 0.5 DIFFERENCE 6 weight % of an alkaline earth metal oxide, wherein the weight ratio of the alkaline earth metal oxide to SiO2 is 1:2 DIFFERENCE 1:3. The composition is first sintered at a temperature of 1450 DEG DIFFERENCE 1650 DEG C. for 1 DIFFERENCE 5 hours, then cooled down to 1000 DEG C., and then crystallized at a temperature of 1200 DEG DIFFERENCE 1500 DEG C. for 1 DIFFERENCE 20 hours. This composition is usable to a maximum temperature 300 DEG C. as indicated theraml- shock-resistant testing, and is well application to a part subject to wide thermal variation and for which a conventional 85% DIFFERENCE 96% alumina material is not usable.