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

doi:10.3724/SP.J.1077.2010.00087

Abstract

Abstract:

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·m^1/2, 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.

Key words: calcium hexaboride, nano/micron composite ceramic, vacuum hot-pressing, intragranular structure, mechanical property

CLC Number:

TQ174

ZHANG Lin,MIN Guang-Hui,YU Hua-Shun. Morphology Characteristics and Mechanical Properties of Nano/Micron Calcium Hexaboride Sintered Body[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00087.

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

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