| 摘要 |
PURPOSE:To prepare useful long whiskers, in high yield, by heating a powdery mixture of silicon dioxide and a reducing agent, and introducing the generated silicon monoxide gas into a reaction tube having specific atmosphere. CONSTITUTION:A powdery mixture obtained by mixing silicon dioxide and a reducing agent such as metallic silicon, carbon, etc. is heated in an inert gas at >=1,300 deg.C to generate silicon monoxide gas or a mixture of silicon monoxide gas and carbon monoxide gas. The generated gas is introduced together with a carrier gas consisting of an inert gas such as nitrogen gas, carbon dioxide gas, argon gas, helium gas, etc. into a reaction tube heated at >=1,000 deg.C and containing carbon impregnated with a metal selected from iron, cobalt and nickel or their alloys. Silicon nitride whiskers are deposited and grown in a nitriding atmosphere, and silicon carbide whiskers are obtained in a reducing and cementatious atmosphere containing carbon monoxide gas or hydrogen gas. The grown whiskers are taken out of the reaction tube. |
