Silicon carbide ceramic material for bearings and preparation method of silicon carbide ceramic material

A technology of silicon carbide ceramics and bearings, applied in the field of silicon carbide ceramics, can solve the problems of difficult sintering and compactness, high porosity, low density of silicon carbide ceramics, etc., and achieve the effects of high density, optimized sintering conditions, and low porosity.

Inactive Publication Date: 2018-09-21
芜湖市尚行会务服务有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a silicon carbide ceramic material used for bearings and its preparation method, which solves the problem that the characteristics of silicon carbide ceramics make it difficult to sinter and compact under normal pressure, and the prepared silicon carbide ceramics have low density and poor porosity. High rate, unable to meet the needs of industrial production

Method used

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preparation example Construction

[0013] The invention provides a method for preparing a silicon carbide ceramic material used for bearings, the preparation method comprising:

[0014] (1) Mix silicon carbide, epoxy resin, bentonite, methylenebisacrylamide, acrylamide, glass fiber, graphite powder, petroleum coke and absolute ethanol, and then ball mill to obtain slurry M;

[0015] (2) Drying, granulating and aging the slurry M to obtain powder N;

[0016] (3) After mixing the powder N and the sintering aid, perform pressure molding and sintering to obtain a silicon carbide ceramic material; wherein, the pressure molding adopts a three-stage pressure molding method, and the conditions for the first stage of pressure include at least: The pressure is 80-90MPa, and the holding time is 10-20s; the conditions for the second stage of pressurization include at least: the pressure is 20-40MPa, and the holding time is 30-50s; the conditions for the third stage of pressurization include at least: 15- 35MPa, the holdin...

Embodiment 1

[0025] 100g silicon carbide, 20g epoxy resin, 5g bentonite, 5g methylene bisacrylamide, 1g acrylamide, 2g glass fiber, 0.5g graphite powder, 0.5g petroleum coke and 200g absolute ethanol are mixed and then ball milled (ball milled) The speed is 220r / 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). Obtain powder N; mix 100g of powder N and 8g of sintering aids, pressurize and sinter (sinter in a nitrogen environment, the sintering temperature is 1300°C, and the sintering time is 30min), and the bearing is obtained. Silicon carbide ceramic material A1; among them, the pressure molding adopts the method of three-stage pressure molding, and the conditions for the first stage of pressure include at least: the pressure is 80MPa, and the pressure holding time is 10s; the conditions for the second stage of pressure include at least: The pre...

Embodiment 2

[0027] 100g silicon carbide, 40g epoxy resin, 10g bentonite, 10g methylenebisacrylamide, 5g acrylamide, 4g glass fiber, 2.5g graphite powder, 1.5g petroleum coke and 300g absolute ethanol are mixed and then ball milled (ball milled) The speed is 250r / min, the time of ball milling is 2h), and the slurry M is obtained; the slurry M is dried (the drying temperature is 55°C, and the drying time is 4h), granulated and stale (the stale time is 2h). Obtain powder N; mix 100g of powder N and 12g of sintering aids, pressurize and sinter (sinter in an argon environment, the sintering temperature is 1500°C, and the sintering time is 60min), and the bearing Silicon carbide ceramic material A2; wherein, the pressure molding adopts the method of three-stage pressure molding, and the conditions for the first stage of pressure include at least: the pressure is 90MPa, and the holding time is 20s; the conditions for the second stage of pressure include at least : The pressure is 40MPa, and the ...

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Abstract

The invention discloses silicon carbide ceramic material for bearings and a preparation method of the silicon carbide ceramic material. The preparation method includes: subjecting silicon carbide, epoxy resin, bentonite, methylene bisacrylamide, acrylamide, glass fiber, graphite powder, petroleum coke and absolute ethyl alcohol to mixing and then ball-milling to obtain slurry M; subjecting slurryM to drying, pelleting and decaying to obtain powder N; mixing the powder N with a sintering additive for pressure molding and sintering to obtain the silicon carbide ceramic material. With the method, problems that silicon carbide ceramics are difficult to be sintered and densified at atmospheric pressure due to properties of the same, and the obtained silicon carbide ceramics are low in density,high in porosity and incapable of meeting demands of industrial production are solved.

Description

technical field [0001] The invention relates to the field of silicon carbide ceramics, in particular to a silicon carbide ceramic material used for bearings 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. Due to the excellent characteristics of strong oxidation resistance, 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, special ceramic materials have become cutting-edge ceramic materials. An important part of science and is generally valued. Silicon carbide ceramics is a new material that ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/82C04B35/64
CPCC04B35/565C04B35/64C04B35/82C04B2235/349C04B2235/422C04B2235/425C04B2235/77
Inventor 王稀
Owner 芜湖市尚行会务服务有限公司
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