Loading patent…
AssigneeKorea Institute of Science and Technology
InventorsYong Bai Son, In-Jae Jung, Sang-Woo Kim
Estimating the term…
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.about.30 weight % of one aluminum silicate selected from the group consisting of kaolinite, silimanite, and kyanite, 75.about.94 weight % of Al.sub.2 O.sub.3 based on the total amount of Al.sub.2 O.sub.3, and 0.5.about.6 weight % of an alkaline earth metal oxide, wherein the weight ratio of the alkaline earth metal oxide to SiO.sub.2 is 1:2.about.1:3. The composition is first sintered at a temperature of 1450.degree..about.1650.degree. C. for 1.about.5 hours, then cooled down to 1000.degree. C., and then crystallized at a temperature of 1200.degree..about.1500.degree. C. for 1.about.20 hours. This composition is usable to a maximum temperature 300.degree. 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%.about.96% alumina material is not usable.
An alumina-mullite composite having mechanical and thermal shock resistance and no porosity formed from a mixture, comprising:
A process for preparing an alumina-mullite composite having mechanical and thermal shock resistance and no porosity, comprising:
A silica-alumina mixture for forming an alumina-mullite composite having mechanical and thermal shock resistance and no porosity, comprising:
Dependencies are inferred from the claim text.