Chemically excited combustion process for synthesizing Si3N4/SiC composite powder

A technology of combustion synthesis and composite powder, which is applied in the field of inorganic non-metallic materials to achieve the effects of reducing costs, reducing equipment requirements, and reducing nitrogen pressure

Inactive Publication Date: 2007-12-19
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is limited to the stage of experimental research, and there will be a considerable distance from industrial production.

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  • Chemically excited combustion process for synthesizing Si3N4/SiC composite powder

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Experimental program
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Effect test

Embodiment 1

[0035] Si powder with an average particle size of 0.5 μm, carbon black with an average particle size of 30 nm, NH 4 Cl and polytetrafluoroethylene are sampled according to the weight ratio of 60:30:5:5, and they are put into the ball milling tank of the vibrating ball mill for 9 hours to make them fully mixed and activated; the mixed and activated material is placed in In a porous graphite crucible, the bulk density is about 0.3-1.0g / cm 3 , place a spiral tungsten wire on the upper layer of the material, the diameter of the tungsten wire is 0.5mm, and put them together into the combustion synthesis reactor; after vacuuming, fill high-purity nitrogen from the bottom of the reactor until the nitrogen pressure reaches 2MPa Pass the spiral tungsten wire with a pulse current of 10-30A to make it generate heat and induce the self-propagating combustion of the raw material powder. After the combustion reaction lasts for 10 minutes, cool to room temperature, then discharge the reactio...

Embodiment 2

[0037] Si powder with an average particle size of 5 μm, carbon black with an average particle size of 20 nm, NH 4 Cl and polytetrafluoroethylene are sampled according to the weight ratio of 70:25:2:3, and the Si powder, carbon black and NH 4 Cl was put into the ball mill jar of planetary ball mill and milled for 5 hours to make it fully mixed, then added polytetrafluoroethylene, and continued to grind for 1 hour; the mixed material was placed in a porous graphite crucible so that the bulk density was about 0.3~1.0g / cm 3 , place a spiral tungsten wire on the upper layer of the material, and put them together into the combustion synthesis reactor; after vacuuming, fill nitrogen gas from the bottom of the reactor to 1MPa; pass the spiral tungsten wire with a pulse current of 12A to make it generate heat and induce The raw material powder is self-propagating combustion, and after the combustion reaction lasts for 30 minutes, cool to room temperature, release the air, and finely g...

Embodiment 3

[0039] Si powder with an average particle size of 44 μm, carbon black with an average particle size of 10 nm, NH 4 Cl and polytetrafluoroethylene are sampled at a weight ratio of 52:31:2:15, put into the ball mill jar of a vibratory ball mill, and ball milled for 4.5 hours to fully mix and activate; the mixed and activated material is placed in In a porous graphite crucible, the bulk density is about 0.3-1.0g / cm 3 , put a spiral tungsten wire on the upper layer of the material, the diameter of the tungsten wire is 0.5mm, and put them together into the combustion synthesis reactor; after vacuuming, fill the argon gas from the bottom of the reactor to 3MPa; put the spiral tungsten wire Pass a pulse current of 12A to make it generate heat and induce the self-propagating combustion of the raw material powder. After the combustion reaction lasts for 15 minutes, cool to room temperature, release the air, and finely grind the product to obtain the reaction product. The reaction prod...

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Abstract

The present invention belongs to the field of inorganic material technology, and is especially chemically excited combustion process for synthesizing Si3N4 / SiC composite powder. The Si3N4 / SiC composite powder is prepared with silica powder in 40-70 weight portions, carbon black in 20-50 weight portions, and chemical energizer in 0.5-20 weight portions, and through mg to obtain mixture, grinding and activating the mixture, loading in a high pressure reaction kettle in the bulk density of 0.3-1.0 g / cu cm, vacuum pumping and filling N2 or Ar in the pressure of 1-3 MPa, and inducing the mixture to produce self-spreading combustion synthesis reaction to prepare Si3N4 / SiC composite powder. The process of the present invention has the advantages of simple steps, short production period, low power consumption and low cost.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a chemically stimulated combustion synthesis of silicon nitride / silicon carbide (Si 3 N 4 / SiC) composite powder method. Background technique [0002] Silicon nitride and silicon carbide ceramics are advanced high-temperature structural materials developed in the past 40 to 50 years, and are typical representatives of non-oxide structural ceramic materials. They have excellent room temperature and high temperature performance. However, with the popularization of the application of ceramic materials, single-phase materials have gradually exposed some insurmountable shortcomings, such as low fracture toughness; strength reduction caused by grain growth during sintering, etc., so the introduction of The research on silicon nitride-based composite materials of the second phase has attracted more and more people's attention, and silicon carbide is currently the most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/584C04B35/565
Inventor 杨筠杨坤林志明李江涛
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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