Silicon nitride powder suspension reactor

Abstract

Relating to the silicon nitride preparation field, the invention discloses a silicon nitride powder suspension reactor, which comprises a furnace tube, a furnace shell, a heating torch and a spray pipe. The inner cavity of the furnace tube falls into a heating area and a reaction area in turn from top to bottom in order, the heating torch spraying flame downward is fixed at the upper end of the furnace tube, and the lower end of the furnace tube is equipped with a discharge port. The furnace shell is sleeved outside the furnace tube, and heat preservation cotton is disposed between the furnacetube and the furnace shell. The spray pipe passes through the furnace shell and the furnace tube and enters the heating area inside the furnace tube, the end of the spray pipe is equipped with a nozzle, which faces upward and is located below the heating torch. The furnace shell is equipped with a nitrogen inlet. A ring of air inlet seams are disposed on the inner wall of the furnace tube at a same height, the openings of the air inlet seams on the vertical direction are obliquely upward toward the inner cavity of the furnace tube, and openings of the air inlet seams on the horizontal plane are approximately or completely tangent to the inner wall curved surface of the furnace tube and are consistent in orientation. The silicon nitride powder prepared by the reactor provided by the invention has the advantages of high purity, small particle size, high alpha phase content, high yield and fast production.

Description

technical field [0001] The invention relates to the field of silicon nitride preparation, in particular to a silicon nitride powder suspension reactor. Background technique [0002] Silicon nitride is an important structural ceramic material. It is a superhard substance, inherently lubricious, and wear-resistant, and is an atomic crystal; it resists oxidation at high temperatures. Moreover, it can also resist cold and heat shocks, and it will not shatter when heated to above 1000°C in the air, cooled rapidly and heated again sharply. It is precisely because silicon nitride ceramics have such excellent characteristics that people often use it to manufacture mechanical components such as bearings, gas turbine blades, mechanical seal rings, and permanent molds. [0003] At present, domestic silicon nitride powder production mainly consists of the following two methods: [0004] 1. Bell furnace electric or microwave heating nitrogen infiltration method [0005] Steps: silico...

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Problems solved by technology

[0015] 4. Difficult production management: many equipment, large workshop, many links, many processes, large investment

[0016] 5. Many supporting facilities: auxiliary facilities such as dust absorption, anti-static, vibration isolation, and noise reduction

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