以χ-Al2O3粉末製作mullite-alumina複合陶瓷

孔鴻仁

doi:10.6844/NCKU202001958

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以χ-Al2O3粉末製作mullite-alumina複合陶瓷

Mullite-alumina composite fabrication using χ-Al2O3 powders

孔鴻仁 , Masters　　Advisor：向性一　　Co-advisor ：顏富士

繁體中文 DOI： 10.6844/NCKU202001958

富鋁紅柱石； χ-Al2O3 ； mullite-alumina ；硬度； mullite ； χ-Al2O3 ； mullite-alumina ； hardness

Abstract │ Reference (75)

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

For synthesizing mullite-alumina composite ceramics with high hardness, χ-Al2O3、α-Al2O3 and cristobalite were used as raw materials, and the difference of alumina sources in mullite-alumina between transforming from χ-Al2O3 and using merchant alumina powders(AKP-30) were examined. Group A samples were prepared by mixing χ-Al2O3 and cristobalite with different weight ratio; Group B samples were prepared by mixing stoichiometric mullite (71.8wt% χ-Al2O3 and 28.2wt% cristobalite) and α-Al2O3 with different weight ratio. Green bodies were firstly heated up to 1400℃ for mullite reaction, then sintered at 1550℃ for varying time. By the characterization of χ-Al2O3, high specific area and small diameter lead to the advance of mullite formation temperature to 1250℃. The result show that group A is able to reach higher shrinkage rate and relative density in the same sintering time comparing with group B. Average grain size of both group A and B are approximately 1 μm. The hardness of group A tended to increase as the χ-Al2O3 content increase while the hardness of group B has opposite trend. It is indicated that using χ-Al2O3 as the alumina sources of mullite-alumina has higher hardness than using α-Al2O3.
Comparing with reference, mullite-alumina with high hardness and small grain size can be synthesizing by using χ-Al2O3 as raw materials leading to lower sintering temperature and shorter sintering time.

Reference ( 75 ) 〈TOP〉

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