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A silicon nitride powder suspension reactor

A silicon nitride powder and reactor technology, applied in nitrogen compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of difficult production management, many equipment, large workshop, etc., and achieve reduced investment, less investment, and high output Effect

Active Publication Date: 2020-01-03
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 suspension reactor
  • A silicon nitride powder suspension reactor
  • A silicon nitride powder suspension reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] like figure 1 As shown, a silicon nitride powder suspension reactor includes: a furnace tube 1 (graphite furnace tube), a furnace shell 2, a heating torch 3 (plasma torch) and a nozzle 4.

[0070] like figure 1 As shown, the inner cavity of the furnace tube is divided into a heating zone A and a reaction zone B from top to bottom, the upper end of the furnace tube is fixed with the heating torch that sprays fire downward, and the lower end of the furnace tube is provided with a discharge port 5. A cavity neck 10 is provided inside the furnace tube, and the cavity neck is located at the junction of the heating zone and the reaction zone; the upper end of the cavity neck is in an inverted conical shape, and the lower end of the cavity neck is in a positive conical shape.

[0071] The furnace shell is sleeved on the outside of the furnace tube and there is a gap between the furnace tube and the furnace shell, and the gap is filled with insulation cotton 9 . A sealing ga...

Embodiment 2

[0076] The difference between this embodiment and Embodiment 1 is that: the vertical angle of the air inlet slit is 30 degrees. And the air inlet slots are respectively provided with 1 layer and 5 layers in the heating area and the reaction area.

Embodiment 3

[0078] The difference between this embodiment and Embodiment 1 is that: the vertical angle of the air inlet slit is 50 degrees. And the air inlet slots are respectively provided with 1 layer and 3 layers in the heating zone and the reaction zone.

[0079] Reactor production of the present invention compares with main index in the industry

[0080] index peers The reactor Compare electricity bill 40,000 yuan / ton 10,000 yuan / ton Save 30,000 yuan / ton salary 10,000 yuan / ton 0.5 million yuan / ton Save RMB 5,000 / ton Consumables 06,000 yuan / ton 01,000 yuan / ton Save RMB 5,000 / ton total 56,000 yuan / ton 16,000 yuan / ton Save 40,000 yuan / ton purity 98％ 99.5％ 1.5% increase a phase 90％ 97％ 7% increase particle size 0.7-1 micron 0.5-0.7 micron Smaller than 0.2 microns Equivalent investment output 1:5 1 5 5 times

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/068C04B35/584C04B35/626
CPCC01B21/0682C01P2006/80C04B35/591C04B35/626
Inventor 任小平
Owner ZHEJIANG YUYAO NEW MATERIAL CO LTD