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A silicon carbide sealing material and a sintering method thereof

A sintering method and sealing material technology, which are applied in the field of silicon carbide sealing materials and their preparation, can solve the problems of difficult sintering and compactness, high porosity, and cannot meet industrialized production, and achieve the effects of high density and low porosity.

Inactive Publication Date: 2017-09-26
ANHUI DONGXUN SEALING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a silicon carbide sealing material and its preparation method, which solves the problem that the characteristics of silicon carbide materials make it difficult to sinter and compact under normal pressure, and the prepared silicon carbide sealing material has a lower density and a higher porosity , unable to meet the needs of industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 100g silicon carbide, 25g epoxy resin, 8g bentonite, 6g diatomaceous earth, 1.5g boron carbide, 2g glass fiber, 0.5g carbon black, 0.6g petroleum coke and 260g absolute ethanol are mixed and ball milled (the speed of ball milling is 260r / min, the time of ball milling is 1h), and the slurry M is obtained; the slurry M is dried (the drying temperature is 45°C, and the drying time is 2h), granulated and stale (the stale time is 1h) to obtain powder Material N: Mix 100g of powder N and 10g of sintering aid, pressurize and sinter (sinter in a nitrogen atmosphere, the sintering temperature is 1300°C, and the sintering time is 30min), to obtain silicon carbide sealing material A1; Among them, the pressure molding adopts the method of three-stage pressure molding. The conditions for the first stage of pressure include at least: the pressure is 30MPa, and the holding time is 30s; the conditions for the second stage of pressure include at least: the pressure is 80MPa, and the hold...

Embodiment 2

[0029] Mix 100g of silicon carbide, 45g of epoxy resin, 12g of bentonite, 10g of diatomaceous earth, 7g of boron carbide, 4g of glass fiber, 3.5g of carbon black, 2.5g of petroleum coke and 300g of absolute ethanol before ball milling (the speed of ball milling is 250r / min, the time of ball milling is 2h) to obtain the slurry M; the slurry M is dried (the drying temperature is 65°C, the drying time is 3h), granulated and stale (the stale time is 2h) to obtain the powder N; Mix 100g of powder N and 12g of sintering aids, and then perform pressure molding and sintering (sintering in an argon atmosphere, the sintering temperature is 1500°C, and the sintering time is 60min), to obtain silicon carbide sealing material A2; Among them, the pressure molding adopts the method of three-stage pressure molding. The conditions for the first stage of pressure include at least: the pressure is 50MPa, and the holding time is 40s; the conditions for the second stage of pressure include at leas...

Embodiment 3

[0031] Mix 100g of silicon carbide, 35g of epoxy resin, 10g of bentonite, 8g of diatomaceous earth, 3g of boron carbide, 3g of glass fiber, 1.5g of carbon black, 0.8g of petroleum coke and 250g of absolute ethanol before ball milling (the speed of ball milling is 230r / min, the ball milling time is 1.5h), to obtain the slurry M; after drying the slurry M (the drying temperature is 50°C, the drying time is 3h), granulation and aging (the aging time is 1.5h) to obtain Powder N: Mix 100g powder N and 10g sintering aid, pressurize and sinter (sinter in an argon atmosphere, the sintering temperature is 1400°C, and the sintering time is 45min), to obtain a silicon carbide sealing material A3; Among them, the pressure molding adopts the method of three-stage pressure molding. The conditions for the first stage of pressure include at least: the pressure is 40MPa, and the holding time is 35s; the conditions for the second stage of pressure include at least: the pressure is 85MPa, The h...

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PUM

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Abstract

A silicon carbide sealing material and a sintering method thereof are provided. The method includes mixing silicon carbide, epoxy resin, bentonite, diatomite, boron carbide, glass fibers, carbon black, petroleum coke and absolute ethyl alcohol; performing ball milling to obtain slurry M; drying, granulating and ageing the slurry M to obtain powder N; mixing the powder N and a sintering auxiliary agent; and then performing compressed forming and sintering to obtain the sealing material. The sealing material and the method overcome a problem that compact silicon carbide sealing materials are difficult to prepare through atmospheric-pressure sintering and silicon carbide sealing materials are low in density, poor in leakproofness and high in porosity and cannot meet production requirements due to characteristics of the silicon carbide sealing materials.

Description

technical field [0001] The invention relates to the technical field of silicon carbide sealing materials, in particular to a silicon carbide sealing material and a preparation method thereof. Background technique [0002] With the development of science and technology, especially the high development of energy and space technology, it is often required that materials must have superior properties such as high temperature resistance, corrosion resistance, and wear resistance before they can be used in harsh working environments. Because the special silicon carbide material has strong oxidation resistance, good sealing performance, good wear resistance, high hardness, good thermal stability, high temperature strength, small thermal expansion coefficient, high thermal conductivity, thermal shock resistance and chemical corrosion resistance, etc. Characteristics have become an important part of cutting-edge science and are generally valued. Silicon carbide has been developed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/645
CPCC04B35/565C04B35/645C04B2235/3418C04B2235/349C04B2235/3821C04B2235/422C04B2235/424C04B2235/5216
Inventor 王茜张俊辉
Owner ANHUI DONGXUN SEALING TECH
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