Method for preparing silicon nitride in sedimentation-type and self-propagating mode

Abstract

The invention provides a method for preparing silicon nitride in a sedimentation-type and self-propagating mode. The method is characterized in that a silicon-containing solid material is introduced into a sedimentation-type reactor furnace body from a solid material inlet; nitrogen is introduced into the furnace body through a gas inlet; the silicon-containing solid material and nitrogen are subjected to a self-propagating reaction in the furnace body to generate the silicon nitride; the silicon nitride settles to the bottom of the furnace body and is then output through a discharge port. According to the method for preparing the silicon nitride in the sedimentation-type and self-propagating mode provided by the invention, a sedimentation-type mode is adopted for preparation, and continuous synthesis of the silicon nitride can be realized.

Description

technical field [0001] The invention relates to the field of nitride preparation, and further relates to a method for preparing a sinking self-propagating silicon nitride. Background technique [0002] Silicon nitrides (compounds containing silicon and nitrogen) are widely used in industry as ceramics. For example, silicon nitride, which has many excellent properties, such as wear resistance, self-lubrication, high temperature and oxidation resistance, etc., can be used to prepare high temperature resistant parts, heat transfer parts, wear resistant materials and so on. [0003] Self-propagating technology is a way to synthesize materials by exothermic chemical reaction itself. Since the reaction can be continued through the exothermic chemical reaction itself, and the reaction can continue without an external heat source, it is favored by the industry. [0004] The sinking reactor (sinking furnace) is a kind of reactor, which allows the powdery material to complete a parti...

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Problems solved by technology

[0005] The silicon nitride preparation reactors in the prior art are mainly closed reactors, some of which need to be carried out in a high-pressure state, which consumes energy and is unsafe; some require heating reactions, which also cause energy consumption; and the existing reactor preparation The output and purity are not high, and the improvement of the overall equipment is urgently needed to increase the output and reduce energy consumption

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