Preparation method of silicon carbide micro-powder used in silicon carbide crystal growth

Abstract

The invention relates to a preparation method of silicon carbide micro-powder used in silicon carbide crystal growth. The method comprises the steps that: carbon powder and silicon powder are uniformly mixed, such that a mixture is obtained; and the mixture is added into a heating chamber, and is heated by using microwaves, such that the silicon carbide micro-powder used in silicon carbide crystal growth is obtained. According to the invention, microwave heating is adopted, and heating is uniform. The synthesized silicon carbide particles have good particle size homogeneity. The obtained product does not need to be crushed by using a traditional ball mill, such that secondary pollution is prevented, and product purity is ensured. Also, a single-time synthesizing amount is high, and efficiency is high.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide micropowder, in particular to a method for preparing silicon carbide micropowder used for growing silicon carbide crystals. Background technique [0002] Existing high-purity micropowders for silicon carbide crystal growth are mostly broken by induction heating and sintering. For example, after mixing silicon powder and carbon powder, they are placed in a graphite crucible and synthesized by induction heating. Silicon carbide powder synthesized by reaction of silicon powder and silicon powder. The silicon carbide micropowder synthesized by this method is sintered into a block and needs to be crushed again, resulting in secondary pollution of the silicon carbide powder. The synthetic micropowder has different particle sizes after crushing and needs to be screened, resulting in contamination and waste. Moreover, the single synthesis amount of induction heating synthesis is small, which make...

AI Technical Summary

Problems solved by technology

The silicon carbide micropowder synthesized by this method is sintered into a block and needs to be crushed again, resulting in secondary pollution of the silicon carbide powder. The synthetic micropowder has different particle sizes after crushing and needs to be screened, resulting in contamination and waste.

Moreover, the single synthesis amount of induction heating synthesis is small, and it is difficult to meet the requirements of large-scale production.