Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5439032 | Ceramics International | 2017 | 7 Pages |
Abstract
(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)2âx 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)2â15 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.
Related Topics
Physical Sciences and Engineering
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Authors
Qiong Lu, Gaoming Zhu, Xiaohong Wang, Jing lian Fan,