Production method for nano-micron silicon carbide whiskers

Abstract

The invention belongs to the technical field of inorganic non-metallic powder materials, and specifically relates to a production method for silicon carbide whiskers. In order to solve problems of lowyield per unit efficiency, high costs, large pollution, easy agglomeration and low quality of present silicon carbide whisker production methods at home and abroad, the novel high temperature gasification physical production method can be provided. The method selects high purity silicon carbide crystals as raw materials which can be decomposed and gasified with high temperature through a laser gasification high temperature growth furnace, and silicon carbide whiskers with diameters of nono-submicron-micron can be obtained through high temperature synthetic growth, cooling and collection. Thus, high purity and high quality alpha-silicon carbide whiskers with particle sizes of 2 nm - 1.5 [mu]m can be produced through the technology, precise control can be achieved, length-diameter ratio canbe 40-200, and nano silicon carbide micro-powder and silicon carbide nanowires can also be obtained by controlling synthesis temperature and synthesis time ranges through the method. The method has less exhaust gas during production and no waste water and solid waste discharge, is less in investment and high in yield, and can be used for large scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic powder materials, and in particular relates to a production method of nano-micron silicon carbide whiskers. Background technique [0002] Silicon carbide whisker is a single crystal fiber with few defects and a certain length-to-diameter ratio. It is a cubic whisker and belongs to the same crystal form as diamond. It has the highest hardness and modulus among the whiskers that have been synthesized so far. Largest, highest tensile strength, highest temperature resistant whisker product. Silicon carbide whiskers are widely used in national defense, aviation, automobile, electronics industry, energy and other fields, and are extremely high-performance reinforcing and toughening materials. Silicon carbide whiskers have a wide range of applications, and the market demand is huge. With the market, especially the national defense, aviation and other industrial sectors, the quality requir...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low production efficiency, small output, high cost, and large pollution in the current production methods of nano-micron silicon carbide whiskers at home and abroad, the present invention provides a new high-temperature gasification decomposition-synthetic recrystallization production method