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A silicon nitride powder production line

A silicon nitride powder and production line technology, applied in nitrogen compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of difficult production management, many processes, and many equipment, and achieve long preheating time, reasonable connection relationship, Smooth metal surface

Active Publication Date: 2019-10-29
ZHEJIANG YUYAO NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A silicon nitride powder production line
  • A silicon nitride powder production line
  • A silicon nitride powder production line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Such as figure 1 As shown, a silicon nitride powder production line includes a feeding unit, a reaction unit, a receiving unit and a circulating water cooling unit.

[0091] The feeding unit includes a silicon powder feeding mechanism, a nitrogen preparation pressurizing device 300, a microwave plasma preheater 301 and a liquid ammonia storage tank 314. The silicon powder feeding mechanism and the nitrogen preparation and pressurization device are respectively connected with the microwave plasma preheater and provide silicon powder and nitrogen respectively, and the nitrogen preparation and pressurization device is also connected with the silicon powder feeding mechanism to deliver nitrogen gas to provide pressure.

[0092] The reaction unit includes a suspension reactor 302 and a heat preservation cooler 303 connected in sequence; the microwave plasma preheater communicates with the suspension reactor to provide silicon powder and nitrogen for it; the nitrogen preparation pr...

Embodiment 2

[0104] The difference between this embodiment and the first embodiment is that the angle of the air inlet slit in the vertical direction obliquely upward is 30 degrees. And the air inlet slit is provided with 1 layer and 5 layers on the heating zone and the reaction zone respectively.

Embodiment 3

[0106] The difference between this embodiment and the first embodiment is that the angle of the air inlet slit in the vertical direction obliquely upward is 50 degrees. And the air inlet slit is provided with 1 layer and 3 layers on the heating zone and the reaction zone respectively.

[0107] The production line of the present invention compares with the main indicators in the industry

[0108] index Accompany This reactor Compare Electricity bill 40,000 yuan / ton 10,000 yuan / ton Save 30,000 yuan / ton wage 10,000 yuan / ton 5,000 yuan / ton Save 5,000 yuan / ton Supplies 6,000 yuan / ton 10,000 yuan / ton Save 5,000 yuan / ton total 56,000 yuan / ton 16,000 yuan / ton Save 40,000 yuan / ton purity98％99.5％ Increase by 1.5% alpha phase90％97％ Increase by 7% Particle size 0.7-1 micron 0.5-0.7 microns 0.2 microns smaller Equivalent investment output 1:515 5 times

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Abstract

Relating to the silicon nitride preparation field, the invention discloses a silicon nitride powder production line, which comprises a feeding unit, a reaction unit, a material recovering unit and a circulating water cooling unit. The feeding unit comprises a silicon powder feeding mechanism, a nitrogen preparation supercharging device and a microwave plasma preheater. The reaction unit comprisesa suspension reactor and a thermal insulation cooler. The material recovering unit comprises a gas powder separator, a packer and a recovered nitrogen storage tank. The circulating water cooling unitcomprises a water cooling pool and a water cooling pump. The silicon nitride powder prepared by the production line 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 production line. Background technique [0002] Silicon nitride is an important structural ceramic material. It is a super-hard substance, which has lubricity and is wear-resistant. It is an atomic crystal; it is resistant to oxidation at high temperatures. Moreover, it can resist the impact of cold and heat. It will not be broken if it is heated to more than 1000℃ in the air, cooled rapidly and then heated rapidly. It is precisely because of the excellent characteristics of silicon nitride ceramics that people often use it to manufacture bearings, turbine blades, mechanical seal rings, permanent molds and other mechanical components. [0003] At present, the production of silicon nitride powder in China mainly consists of the following two methods: [0004] 1. Nitrogen permeation method of bell furnace electric heating or microwave heating [0005] Ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/068
CPCC01B21/0682
Inventor 任小平
Owner ZHEJIANG YUYAO NEW MATERIAL CO LTD