Method for preparing silicon carbide ceramic product by adopting pre-oxidizing process

A technology of silicon carbide ceramics and pre-oxidation method, which is applied in the field of extruded silicon carbide prepared by pressureless sintering method, can solve the problems of silicon carbide application limitations, etc., and achieve the effects of improved performance, stable performance and simple process

Inactive Publication Date: 2014-01-22
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the application of silicon carbide is greatly limited due to the cost problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The weight of the ingredients is 2.0kg, of which 0.6kg is 80μm fine-grained silicon carbide powder; 0.5kg is 115μm medium-grained silicon carbide powder; 0.6kg is 180μm coarse-grained silicon carbide powder; 0.3kg is phenolic resin.

[0014] First put the silicon carbide powder into batches, put them into a mixer and mix them for 1.0 hr, then put the above mixed materials into a resistance furnace and pre-oxidize them at 500°C for 2.5 hours.

[0015] Put the above mixture into a planetary mill, and pour the phenolic resin into it while mixing until it is evenly mixed. Then put the above-mentioned mud into the mud mixer and knead; finally, wrap it in plastic for aging for 3.5hrs.

[0016] The above mud is put into an extruder for extrusion to obtain a pipe blank. The blank was moved to a vacuum sintering furnace and kept at 1600° C. for 1.5 hrs to obtain a finished product. The flexural strength of the material was measured to be 272 MPa.

Embodiment 2

[0018] The weight of the ingredients is 2.0kg, of which 60μm fine silicon carbide powder is 0.5kg; 125μm medium silicon carbide powder is 0.5kg; 170μm coarse silicon carbide powder is 0.6kg; phenolic resin is 0.4kg.

[0019] First put the silicon carbide powder into batches, put them into a mixer and mix them for 1.5hrs, then put the above mixtures into a resistance furnace and pre-oxidize them at 600°C for 3.0 hours.

[0020] Then put the mixture into a planetary mill, and pour in the phenolic resin while mixing until it is evenly mixed. Then put the above-mentioned mud into the mud mixer and knead it; finally, wrap it in plastic and put it stale for 4.0 hours.

[0021] The above mud is put into an extruder for extrusion to obtain a pipe blank. The blank was moved to a vacuum sintering furnace and kept at 1600° C. for 2.0 hrs to obtain a finished product. The flexural strength of the material was measured to be 265 MPa.

Embodiment 3

[0023] The method for preparing extruded silicon carbide ceramic products by pre-oxidation method is characterized in that its steps are as follows:

[0024] (1) Mix 15 parts by weight of silicon carbide powder with a particle size of 50 μm, 15 parts by weight of silicon carbide powder with a particle size of 100 μm, and 20 parts by weight of silicon carbide powder with a particle size of 150 μm, and then heat it to 200 ° C in a resistance furnace. Oxidize for 1 hour to make pre-oxidized powder;

[0025] (2) Add 10 parts by weight of phenolic resin to the pre-oxidized powder, mix it evenly and put it into a mud mixer for mixing; finally wrap it in plastic for aging for 3 hours to make mud;

[0026] (3) Put the sludge into an extruder for extrusion to obtain a tube blank, move the tube blank to a vacuum sintering furnace, and keep it warm at 1400°C for 1 hour to make an extruded silicon carbide ceramic product.

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Abstract

The invention discloses a method for preparing a silicon carbide ceramic product by adopting a pre-oxidizing process, comprising the following steps: (1) mixing the silicon carbide powder with the particle size of 50-100 microns, the silicon carbide powder with the particle size of 100-150 microns and the silicon carbide powder with the particle size of 150-200 microns uniformly, heating the mixture to 200-700 DEG C by a resistance furnace, and pre-oxidizing for 1-3 hours to obtain the pre-oxidized powder; (2) adding phenolic resin into the pre-oxidized powder, mixing the phenolic resin and the pre-oxidized powder uniformly, putting the mixture into a pugging machine for mixing, wrapping by plastic, and ageing for 3-4 hours to obtain mud; (3) putting the mud into an extruder for extruding to obtain a pipe billet, moving the pipe billet into a vacuum sintering furnace, and preserving the heat at 1,400-,1600 DEG C for 1-2 hours to obtain the extruded silicon carbide ceramic product. The technology for preparing the silicon carbide ceramic product by adopting the pre-oxidizing process has the advantages of simple process and stable performance, and the obtained product has a clean interface and is suitable for industrial scale production.

Description

technical field [0001] The invention relates to the technical field of preparing extruded silicon carbide by a pressureless sintering method. Background technique [0002] Silicon carbide ceramic materials have been extensively researched and developed due to their low density, high elastic modulus, high thermal conductivity, low thermal expansion coefficient, good thermal shock and oxidation resistance, moderate high temperature strength, corrosion resistance and excellent semiconductor properties. Application: Its application fields include: 1. It can be used for high-temperature structural materials, such as engine parts and gas turbine blades, kiln rollers, refractory materials, etc.; 2. Due to its high elastic modulus and low density, it has high It can be used as a structural material in the field of aviation and aerospace; third, because its thermal expansion coefficient can match Si, GaAs and semiconductor properties, it can be used as an electronic packaging materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 张小立
Owner ZHONGYUAN ENGINEERING COLLEGE
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