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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Published inTransactions of Nonferrous Metals Society of China Vol. 21; no. 1; pp. 1 - 6
Main Authors JEONG, Young-Keun, NIIHARA, Koichi
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.03.2011
National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan 609-735, Korea%Nagaoka University of Technology, Niigata 940-2188, Japan
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
fracture strength
pressureless sintering
nanocomposite
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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.
Bibliography: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.
nanocomposite; pressureless sintering; fracture strength
43-1239/TG
Yotmg-Keun JEONG, Koichi NIIHARA （1. National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan 609-735, Korea; 2. Nagaoka University of Technology, Niigata 940-2188, Japan）
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)61050-9