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Morphology Characteristics and Mechanical Properties of Nano/Micron Calcium Hexaboride Sintered Body

ZHANG Lin1,2,MIN Guang-Hui1,YU Hua-Shun1(1.Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education),Shandong University,Jinan 250061,China;2.Mechanical Engineering Post-doctoral Research Station,Shandong University,Jinan 250061,China)  
Nano/Micron Calcium Hexaboride(CaB6) composite ceramics with different CaB6 nanopowder additions were prepared under 1750℃,32MPa for 5min in vacuum.Influences of CaB6 nanopowders on morphology and mechanical properties of sintered bodies were investigated.Composite ceramic with 10wt% CaB6 nanopowder addition has the highest compactness degree and mechanical properties,whose hardness,bending strength and fractural toughness are 92.6 HRA,331.7MPa and 3.06MPa·m1/2,respectively,better than those of CaB6 ceramics without nanopowder adding or those of reinforced by Ni as sintering additive.The proper amount of nano-particles filled in the micron grain boundaries and the formation of "inner crystal" result in the improvement of compactness and mechanical properties for the CaB6 sintered body.
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