| 摘要 |
A composite material according to the invention includes X parts by volume of boron carbide, Y parts by volume of silicon carbide, and Z parts by volume of silicon as main components, wherein 10<X<60, 20<Y<70, and 5<Z<30 are satisfied, and grains of 10 mum or more of the boron carbide and the silicon carbide are 10-50 parts by volume.
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