Carbides, nitrides, borides, and some oxides have extremely high hardness. Materials that utilize this property are collectively called hard materials. Materials in practical use include diamond (C), silicon carbide (SiC), boron carbide (B 4 C), titanium carbide (TiC), tungsten carbide (WC), boron nitride (cubic) BN, titanium nitride (TiN), silicon nitride (Si 3 N 4 ) , aluminum nitride (AlN), and alumina (Al 2 O 3 ) . The hardness of a material can be thought of as the degree of resistance to forces that attempt to deform it. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
炭化物,窒化物,ホウ化物,ある種の酸化物には硬さの非常に高いものがある。この性質を利用する物質を総称して硬質材料という。実用されているものにダイヤモンドC,炭化ケイ素SiC,炭化ホウ素B4C,チタンカーバイドTiC,炭化タングステンWC,窒化ホウ素(立方晶)BN,窒化チタンTiN,窒化ケイ素Si3N4,窒化アルミニウムAlN,アルミナAl2O3などがある。物質の硬さは,変形させようとする力に対する抵抗の大小と考えてよい。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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