Synthesis and mechanical properties of (Mo_0.94Nb_0.06)(Si_0.97Al_0.03)₂−x vol% SiC composites fabricated via SHS-HP

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• 作者：Qiong Lu^a ; ^b ; ^{lq432122@139.com} ; Gaoming Zhu^b ; Xiaohong Wang^b ; Jing lian Fan^a
• 关键词：Alloys ; Composites ; Silicides ; Combustion synthesis ; Hot pressing ; Mechanical properties
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：43
• 期：3
• 页码：3424-3430
• 全文大小：1595 K
• 卷排序：43

文摘

(Mo0.94Nb0.06)(Si0.97Al0.03)2–SiC composites were consolidated via vacuum HP sintering from the mixture of (Mo0.94Nb0.06)(Si0.97Al0.03)2 powder and SiC nanoparticles. The (Mo0.94Nb0.06)(Si0.97Al0.03)2 powder was prepared by self propagating synthesis (SHS). The effects of SiC content on the ambient temperature mechanical properties and microstructure of the SHS-HP composites were investigated. The results show that the indentation fracture toughness, bending strength and Vickers hardness of (Mo0.94Nb0.06)(Si0.97Al0.03)2−x vol% SiC composites increase gradually with the increase of SiC content. The grain size and relative density of the composites decrease gradually with increase of SiC content. (Mo0.94Nb0.06)(Si0.97Al0.03)2−15 vol% SiC composite exhibits excellent mechanical properties: Vickers hardness 12.62 GPa, fracture toughness 5.01 MPa m1/2, bending strength 472 MPa. With the addition of SiC, the fracture mode transforms from a mixed mode of transcrystalline and intercrystalline fracture to mainly transcrystalline fracture.