Microstructure and properties of alumina-silicon carbide nanocomposites fabricated by pressureless sintering and post hot-isostatic pressing

A1203/5%SIC nanocomposites were fabricated by pressureless sintering using MgO as a sintering aid and then post hot-isostatic pressed （HIP）, which can subsequently break through the disadvantage of hot-pressing process. The MgO additive was able to promote the densification of the composites, but co...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2011-03, Vol.21 (1), p.1-6
Main Authors: JEONG, Young-Keun, NIIHARA, Koichi
Format: Article
Language:English
Subjects:
fracture strength
HIP处理
nanocomposite
pressureless sintering
常压烧结
微观结构
氧化铝
热等静压
碳化硅复合材料
纳米SiC颗粒
纳米复合材料
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Summary:A1203/5%SIC nanocomposites were fabricated by pressureless sintering using MgO as a sintering aid and then post hot-isostatic pressed （HIP）, which can subsequently break through the disadvantage of hot-pressing process. The MgO additive was able to promote the densification of the composites, but could not induce the grain growth of A1203 matrix due to the grain growth inhibition by nano-sized SiC particles. After HIP treatment, A12OJSiC nanocomposites achieved full densification and homogeneous distribution of nano-sized SiC particles. Moreover, the fracture morphology of HIP treated specimens was identical with that of the hot-pressed A1203/SiC nanocomposites showing complete transgranular fracture. Consequently, high fracture strength of 1 GPa was achieved for the A1203/5%SIC nanocomposites by pressureless sintering and post HIP process.
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)61050-9