A method for synthesizing silicon nitride powder for laser equipment

A technology of silicon nitride powder and synthesis method, applied in the field of special ceramic materials, can solve the problems of poor thermal conductivity and product quality, etc.

Active Publication Date: 2019-02-05
安徽科创中光科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the poor thermal conductivity and product quality problems caused by sintering in the synthesis process of silicon nitride, the invention provides a synthesis method of silicon nitride powder used in laser equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for synthesizing silicon nitride powder for laser equipment, the method comprising the following steps:

[0028] Add 30wt% silicon nitride powder, 45wt% silicon powder, and 25wt% polystyrene-silicon dioxide particles to a solvent mixed with water and ethanol at a volume ratio of 1:0.1, press it into a spherical shape at 0.8Mpa, and then Place in high-purity nitrogen, keep warm at 1200°C for 6 hours, sinter to obtain silicon nitride, cool to room temperature, and pulverize to obtain silicon nitride powder;

[0029] Wherein, the silicon nitride powder used above includes coarse material with a diameter of 100 μm to 1 mm and fine material with a diameter of less than 100 μm, and the ratio of coarse material to fine material is 1.3:1;

[0030] The silicon powder used includes coarse material with a diameter of 100 μm to 1 mm and fine material with a diameter of less than 100 μm, and the ratio of coarse material to fine material is 0.1:1;

[0031] The particle diam...

Embodiment 2

[0036] A method for synthesizing silicon nitride powder for laser equipment, the method comprising the following steps:

[0037] Add 30wt% silicon nitride powder, 55wt% silicon powder, and 15wt% polystyrene-silicon dioxide particles to a solvent mixed with water and ethanol at a volume ratio of 2:3, press into a spherical shape at 5Mpa, and place In high-purity nitrogen, heat at 1350°C for 8 hours, sinter to obtain silicon nitride, cool to room temperature, and pulverize to obtain silicon nitride powder;

[0038] Among them, the silicon nitride powder used above includes coarse material with a diameter of 100 μm to 1 mm and fine material with a diameter of less than 100 μm, and the ratio of coarse material to fine material is 5:1;

[0039] The silicon powder used includes coarse material with a diameter of 100 μm to 1 mm and fine material with a diameter of less than 100 μm, and the ratio of coarse material to fine material is 3:1;

[0040] The particle diameter of the polyst...

Embodiment 3

[0045] A method for synthesizing silicon nitride powder for laser equipment, the method comprising the following steps:

[0046] Add 50wt% silicon nitride powder, 40wt% silicon powder, and 10wt% polystyrene-silicon dioxide particles to a solvent mixed with water and ethanol at a volume ratio of 1:2, press it into a spherical shape at 10Mpa, and place In high-purity nitrogen, keep warm at 1600°C for 4 hours, sinter to obtain silicon nitride, cool to room temperature, and pulverize to obtain silicon nitride powder;

[0047] Wherein, the silicon nitride powder used above includes coarse material with a diameter of 100 μm to 1 mm and fine material with a diameter of less than 100 μm, and the ratio of coarse material to fine material is 10:1;

[0048] The silicon powder used includes coarse material with a diameter of 100 μm to 1 mm and fine material with a diameter of less than 100 μm, and the ratio of coarse material to fine material is 5:1;

[0049] The particle diameter of the...

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Abstract

The invention discloses a synthesis method of silicon nitride powder for laser equipment, and belongs to the technical field of special ceramic materials. The method comprises the following steps that 25 to 55 weight percent of silicon nitride powder, 40 to 70 weight percent of silicon powder and 5 to 35 weight percent of polystyrene-silicon dioxide particles are mixed with solvents; the mixture is pressed into a ball shape at 0.5 to 10 Mpa; the heat insulation is performed for 4 to 15 h at 1100 to 1600 DEG C in nitrogen gas atmosphere; sintering is performed to generate silicon nitride; the materials are cooled to the room temperature and are crushed to obtain the silicon nitride powder material. The silicon nitride powder, the silicon powder and the polystyrene-silicon dioxide particles are compounded and pressed into balls; when polystyrene in the polystyrene-silicon dioxide particles is removed through high temperature, stable hole structures are formed and are used as nitrogen gas circulation passages; the sufficient proceeding of the reaction is performed; meanwhile, in the process of nitridizing the silicon dioxide into silicon nitrogen, a gas passage is maintained for a second time due to oxygen escape, so that the sufficient nitridation of the powder material is ensured.

Description

technical field [0001] The invention relates to silicon nitride, in particular to a method for synthesizing silicon nitride powder used in laser equipment, and belongs to the technical field of special ceramic materials. Background technique [0002] Laser equipment has high power and high heat generation, so it is necessary to use high-performance materials with high strength and high temperature resistance. The molecular formula of silicon nitride is Si 3 N 4 , is an important special ceramic material, which is a superhard substance, has lubricity and wear resistance, and can be used as a high-temperature ceramic raw material. It does not react with other inorganic acids except hydrofluoric acid. Generally, silicon nitride can be prepared by heating silicon powder in nitrogen or reacting silicon halide with ammonia. [0003] Since silicon nitride is a covalent compound with high bond energy, it can form an oxide protective film in the air to prevent further oxidation. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/591C04B35/626
CPCC04B35/591C04B35/626C04B2235/3418C04B2235/428
Inventor 汪思保林永兴
Owner 安徽科创中光科技股份有限公司
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