Silicon nitride-based ceramic ball as well as preparation method and application thereof

A silicon nitride ceramic ball, silicon nitride-based technology, applied in the field of ceramics, can solve the problem that liquid phase additives reduce high temperature resistance, corrosion resistance, wear resistance, thermal conductivity, cannot meet the application conditions in the field of ceramic bearing balls, and it is difficult to achieve high Problems such as the preparation of dense silicon nitride ceramics, to achieve the effects of not being easy to corrode and lose weight, low cost, and strong binding force

Inactive Publication Date: 2020-08-14
佛山华骏特瓷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although silicon nitride ceramics have the above excellent properties, the additives that promote its sintering will also significantly deteriorate its properties. For example, the addition of liquid phase additives will significantly reduce its high temperature resistance, corrosion resistance, wear resistance, thermal conductivity, etc. The performance, especially the ability to resist strong acid and strong alkali corrosion is obviously weakened; however, it is difficult to realize the preparation of high-density silicon nitride ceramics without adding liquid phase sintering aids, and it cannot be used as structural parts
The above two situations make it unable to meet the application conditions in the field of ceramic bearing balls

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for preparing silicon nitride-based ceramic balls, the specific steps are as follows:

[0040] S1: Si powder is used as raw material, the purity of Si powder is 99%, and the particle size is 1 μm; ZrO 2 As catalyst, ZrO 2 The powder purity is 99%, the particle size is 5μm; according to Si:ZrO 2 The mass fraction ratio is 90%:10% for batching: with Al 2 o 3 -Y 2 o 3 As a sintering aid, Al 2 o 3 Powder purity is 99.9%, Al 2 o 3 The particle size of powder is 5μm, Y 2 o 3 The purity is 99.9%, Y 2 o 3 The particle size is 5μm; Al 2 o 3 :Y 2 o 3 The mass fraction ratio is 55%:45%; with ethanol as solvent, Si 3 N 4 The ball is a ball milling medium, mixed on a planetary ball mill for 8 hours, and the above mixed powders are mixed and dried to obtain Si-ZrO 2 -Al 2 o 3 -Y 2 o 3 Mixed powder; after the above dried mixed powder is subjected to dry pressing and cold isostatic pressing, the obtained ceramic ball green body is held at 1400°C for 2 ho...

Embodiment 2

[0045] A method for preparing silicon nitride-based ceramic balls, the specific steps are as follows:

[0046] S1: Si powder is used as raw material, the purity of Si powder is 99%, and the particle size is 1 μm; ZrO 2 As catalyst, ZrO 2 The powder purity is 99%, the particle size is 5μm; according to Si:ZrO 2 The mass fraction ratio is 95%:5% for batching: with Al 2 o 3 -Yb 2 o 3 As a sintering aid, Al 2 o 3 Powder purity is 99.9%, Al 2 o 3 The particle size of powder is 3μm, Yb 2 o 3 99.9% pure, Yb 2 o 3 The particle size is 3μm, Al 2 o 3 :Yb 2 o 3 The mass fraction ratio is 55%:45%; with ethanol as solvent, Si 3 N 4 The ball is a ball milling medium, mixed on a planetary ball mill for 8 hours, and the above mixed powders are mixed and dried to obtain Si-ZrO 2 -Al 2 o 3 -Yb 2 o 3 Mixed powder; after dry pressing and cold isostatic pressing of the above dried mixed powder, the obtained ceramic ball green body is kept at 1450°C for 4 hours for nitriding,...

Embodiment 3

[0051] A method for preparing silicon nitride-based ceramic balls, the specific steps are as follows:

[0052] S1: Si powder is used as raw material, the purity of Si powder is 99%, and the particle size is 1 μm; ZrO 2 As catalyst, ZrO 2 The powder purity is 99%, the particle size is 5μm; according to Si:ZrO 2 The mass fraction ratio is 90%:10% for batching: with Al 2 o 3 -La 2 o 3 As a sintering aid, Al 2 o 3 Powder purity is 99.9%, Al 2 o 3 The particle size of the powder is 5 μm, La 2 o 3 The purity is 99.9%, La 2 o 3 The particle size is 5μm; Al 2 o 3 :La 2 o 3 The mass fraction ratio is 55%:45%; with ethanol as solvent, Si 3 N 4 The ball is a ball milling medium, mixed on a planetary ball mill for 8 hours, and the above mixed powders are mixed and dried to obtain Si-ZrO 2 -Al 2 o 3 -La 2 o 3 Mixed powder; after dry pressing and cold isostatic pressing of the above dried mixed powder, the obtained ceramic ball green body is kept at 1300°C for 4 hours...

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Abstract

The invention discloses a silicon nitride-based ceramic ball as well as a preparation method and application thereof. The silicon nitride-based ceramic ball is formed by depositing a silicon carbide layer on the surface of a silicon nitride ceramic ball. Compared with a silicon nitride ball without a silicon carbide layer deposited, the disclosed silicon nitride-based ceramic ball is not prone tocorrosion and weightlessness in strong acid, strong alkali and kinematic friction states, meanwhile, an interface in contact with the strong acid and strong alkali environment is compact pure siliconcarbide and free of sintering aids, and the silicon nitride-based ceramic ball has better wear resistance, corrosion resistance and the like and can be applied to the field of wear-resistant bearings.

Description

technical field [0001] The invention belongs to the technical field of ceramics, and in particular relates to a silicon nitride-based ceramic ball and a preparation method and application thereof. Background technique [0002] Silicon nitride (Si 3 N 4 ) As a structural material, ceramics have excellent mechanical properties such as high hardness, wear resistance, high temperature resistance and high thermal conductivity, and have great development prospects in the field of structural parts, especially in the field of bearing balls. For the traditional rolling bearing balls, steel balls are used, but the degree of wear is relatively large, lubricants are required, and replacements are frequent; however, silicon nitride ceramics not only have the above characteristics, but also have the characteristics of low density and low friction coefficient. Excellent candidate material for efficient, high-performance rolling bearing balls. [0003] At present, there are many technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/591C04B35/587C04B35/64C04B41/87F16C33/32
CPCC04B35/587C04B35/591C04B35/64C04B41/5059C04B41/87C04B2235/428C04B2235/46C04B2235/6567C04B2235/96C04B2235/9692F16C33/32F16C2206/60C04B41/4531C04B41/4554
Inventor 不公告发明人
Owner 佛山华骏特瓷科技有限公司
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