| 单词 | boron carbide |
| 释义 | boron carbideboron carbideboron carbideBoron Carbideboron carbide[′bȯ‚rän ′kär‚bīd]Boron Carbide(B4C; more correctly B12C3), a compound of boron and carbon. It is formed during the interaction of boron or boric anhydride with carbon at a temperature above 2000° C. It consists of black, shiny crystals with a density of 2.52 g/cm3 and a melting point of 2360° C. It is stable in air up to 1000° C and does not react to acids but is decomposed by alkalis. It exceeds corundum (Al2O3) and carborundum (SiC) in hardness and is softer only than diamond and borazon. It is used as an abrasive and grinding material, as a semiconductor, and also in nuclear engineering, as a neutron-absorbing material. |
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