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A kind of preparation method of pressureless silicon carbide bearing ball

A technology of pressureless silicon carbide and bearing balls, which is applied in the field of preparation of new pressureless silicon carbide bearing balls, and can solve problems such as low process efficiency

Active Publication Date: 2017-01-25
山东宝纳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the bearing ball is mainly to use hand pre-pressing and then isostatic pressing to form, the process efficiency is low

Method used

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  • A kind of preparation method of pressureless silicon carbide bearing ball

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preparation example Construction

[0012] A method for preparing a new type of pressureless silicon carbide bearing ball using the above-mentioned silicon carbide granulated powder, which uses silicon carbide granulated powder as a raw material, and the preparation method steps are as follows:

[0013] (1) Pre-pressing: Fill the silicon carbide granulated powder into half of the mold, scrape off the excess silicon carbide granulated powder, and press it into a spherical blank of silicon carbide bearing ball with a hydraulic forming machine;

[0014] (2) Vacuum packaging: vacuum packaging the spherical blanks of silicon carbide bearing balls press-formed in step (1);

[0015] (3) Isostatic pressing: After packaging, isostatic pressing is performed, and the bearing ball body is produced after isostatic pressing;

[0016] (4) Drying: Dry the prepared bearing ball body at 40-80°C for 10-30 hours;

[0017] (5) Sintering: The dried silicon bearing ball is heated to 2060-2120°C for 60-180 minutes in a vacuum state, and argon is...

specific Embodiment approach

[0032] The following embodiments further limit the present invention, but are not limited thereto.

[0033] The raw materials used in the examples are silicon carbide powder, phenolic resin, carbon black, graphite, boron carbide, and polyvinyl alcohol.

[0034] The hydraulic forming machine in the embodiment was purchased from Ningbo Jianke Hydraulic Machinery Manufacturing Company, model YA800.

[0035] The vacuum packaging machine was purchased from Shandong Zhucheng Zhengtai Machinery Co., Ltd., model DZ-400 / 2L vacuum packaging machine,

[0036] The isostatic press was purchased from Shanxi Jinkaiyuan Industrial Co., Ltd., model: KJYo500 cold isostatic press.

Embodiment 1

[0038] A new type of preparation method of pressureless silicon carbide bearing ball, using silicon carbide granulated powder as raw material, said silicon carbide granulated powder includes the following material components in mass percentage: silicon carbide powder 76%, phenolic resin 10%, Carbon black 2%, graphite 2%, boron carbide 1%, polyvinyl alcohol 10%;

[0039] The preparation steps of the raw material of silicon carbide granulated powder are as follows:

[0040] Take silicon carbide powder, phenolic resin, carbon black, graphite, and boron carbide and mix them evenly, then add polyvinyl alcohol with a mass concentration of 11% to 19% and deionized water and mix them evenly. Add ammonia with a mass concentration of 25% to adjust the Ph value. The addition amount is 0.1%% of the mass of silicon carbide powder, phenolic resin, carbon black, graphite, and boron carbide mixture. The addition amount of deionized water is the mass of silicon carbide powder, phenol resin, carbon ...

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Abstract

The invention relates to a preparation method of novel non-pressure silicon carbide bearing balls. The bearing balls take silicon carbide granulating powder as a raw material and are prepared through pressing into balls, drying, sintering, screening and finish machining steps. The silicon carbide granulating powder comprises components in percentage by mass as follows: 70%-80% of silicon carbide micro-powder, 3%-10% of phenolic resin, 0.5%-3% of carbon black, 0.5%-3% of graphite, 0.2%-2% of boron carbide and 8%-12% of polyvinyl alcohol. The silicon carbide granulating powder is taken as the raw material for preparation, a hydraulic molding machine is matched for prepressing, vacuum packaging, isostatic pressing, drying and sintering, the prepared bearing balls are low in cost and price, continuous production can be realized, and the powder is greatly saved.

Description

Technical field [0001] The invention relates to a method for preparing a novel pressureless silicon carbide bearing ball, which belongs to the technical field of ceramic preparation. Background technique [0002] Ceramic bearing balls are currently made of silicon nitride. Silicon nitride ceramics have the characteristics of high strength, high temperature resistance, and high wear resistance. Among ceramic materials, their comprehensive mechanical properties are better. It is precisely because of the excellent characteristics of silicon nitride ceramic that people often use it to make bearing balls. However, the cost of bearing balls made of silicon nitride is higher, and the product is expensive. In addition, the current method of preparing silicon nitride bearing balls is mainly pre-pressed by hand and then isostatically pressed. The process efficiency is low and the powder waste is serious. [0003] Chinese patent document CN101125755A (application number: 200610030103.8) dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 张玉军李兆敏李文杰翟彦霞贾婧婧刘欢韩翠狄聚泽
Owner 山东宝纳新材料有限公司
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