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

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

Inactive Publication Date: 2018-10-26
芜湖市尚行会务服务有限公司
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  • Summary
  • Abstract
  • Description
  • 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) After mixing silicon carbide, aluminum oxide powder, zirconia powder, methylenebisacrylamide, acrylamide, glass fiber, graphite powder, petroleum coke and absolute ethanol, ball milling is performed 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 includ...

Embodiment 1

[0025] Mix 100g silicon carbide, 20g aluminum oxide powder, 5g zirconia powder, 5g methylenebisacrylamide, 1g acrylamide, 2g glass fiber, 0.5g graphite powder, 0.5g petroleum coke and 200g absolute ethanol Carry out ball milling afterward (the speed of ball milling is 220r / min, and the time of ball milling is 1h), obtains slurry M; Slurry M is dried (the temperature of drying is 45 ℃, and the time of drying is 2h), granulation and stale (stale The time is 1h) to obtain powder N; 100g of powder N and 8g of sintering aid are mixed and then pressurized and sintered (the second sintering treatment is carried out in a nitrogen environment, and the temperature of the first sintering is 1300 °C, The time of the first sintering is 30min; the temperature of the second sintering is 800°C, and the time of the second sintering is 20min), to obtain the silicon carbide ceramic material A1 for the bearing; among them, the pressure molding adopts three stages of pressure For the molding metho...

Embodiment 2

[0027] Mix 100g silicon carbide, 40g aluminum oxide powder, 10g zirconia powder, 10g methylenebisacrylamide, 5g acrylamide, 4g glass fiber, 2.5g graphite powder, 1.5g petroleum coke and 300g absolute ethanol Carry out ball milling afterward (the speed of ball milling is 250r / min, and the time of ball milling is 2h), obtains slurry M; Slurry M is dried (the temperature of drying is 55 ℃, and the time of drying is 4h), granulation and stale (stale The time is 2h) to obtain powder N; mix 100g powder N and 12g sintering additives and then carry out pressure molding and sintering (the second sintering treatment is carried out in an argon environment, and the temperature of the first sintering is 1500°C , the time of the first sintering is 60min; the temperature of the second sintering is 1000°C, and the time of the second sintering is 30min), and the silicon carbide ceramic material A2 used for the bearing is obtained; among them, the pressure molding adopts three stages For compre...

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Abstract

The invention discloses a silicon carbide ceramic material for bearings and a preparation method of the silicon carbide ceramic material for the bearings. The preparation method includes: mixing silicon carbide, aluminum oxide powder, zirconium oxide powder, methylene bisacrylamide, acrylamide, glass fibers, graphite powder, petroleum coke and absolute ethyl alcohol, and performing ball milling toobtain slurry M; subjecting the slurry M to drying, granulating and aging to obtain powder N; mixing the powder N with sintering additives, and performing pressure forming and sintering to obtain thesilicon carbide ceramic material. The problem of failure in meeting of industrial production demands due to low density and high porosity of silicon carbide ceramics which can be hardly compacted bysintering under the normal pressure owing to characteristics of the silicon carbide ceramics is 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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IPC IPC(8): C04B35/565C04B35/82C04B35/64C04B35/622
CPCC04B35/565C04B35/622C04B35/64C04B35/806C04B35/82C04B2235/3206C04B2235/3208C04B2235/3217C04B2235/3244C04B2235/3418C04B2235/349C04B2235/422C04B2235/425C04B2235/658C04B2235/661C04B2235/77
Inventor 王稀
Owner 芜湖市尚行会务服务有限公司
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