6 April 2001 Mechanical properties of SiB6 addition of carbon sintered body
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Abstract
Boride material is said as the useful material, which has high melting point and high strength. B4C in carbide is very hard at the next of the diamond and cubic-BN in the Mohs hardness and B4C has excellent chemical stability and high strength. B4C is being used as the polishing material from the hardness. However, it is difficult to make sintered body from high melting point (2623 K). Several silicon boride phases such as SiB4, SiB6, SiB6-x, SiB6+x, and Si11B31, were previously reported. Silicon hexaboride (SiB6) has proved to be a potentially useful material because of its high degree of hardness, moderate melting point (2123 K), and low specific gravity. We studied the preparation of SiB6-B4C-SiC sintered body in this report. We knew experientially that SiB6 reacts with carbon at the high temperature, and forms B4C or SiC. Carbon addition SiB6 sintered body produced by hot pressing and reaction sintering that sintering condition was 1973 K for 3.6 ks in vacuum under a pressure of 25 MPa. The relative density of sintered bodies (SiB6-0,5,10,15 wt%C) was approximately 100%. Characterization of mechanical properties was used indentation, Vickers hardness and thermal
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Samon Tanaka, Noriyuki Fukushima, Jun-ichi Matsushita, T. Akatsu, K. Niihara, E. Yasuda, "Mechanical properties of SiB6 addition of carbon sintered body", Proc. SPIE 4234, Smart Materials, (6 April 2001); doi: 10.1117/12.424426; https://doi.org/10.1117/12.424426
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