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Silicon nitride ceramic ball

A technology of silicon nitride ceramic balls and ceramic balls, applied in the field of silicon nitride ceramic balls, can solve the problems of strict production control requirements, high mold material requirements, and high sintering pressure

Inactive Publication Date: 2014-06-11
大连大友高技术陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its sintering pressure is high, the process and equipment are complicated, the production control requirements are strict, the mold material requirements are high, the energy consumption is large, the production efficiency is low, and the production cost is high.

Method used

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  • Silicon nitride ceramic ball
  • Silicon nitride ceramic ball
  • Silicon nitride ceramic ball

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] ① Preparation of ceramic raw materials: mix the dried ceramic raw materials uniformly according to the proportion, pass through a 80-200 mesh sieve, put the sieved powder into a ball mill, and mill it at a speed of 300-360r / min for 6h-10h

[0036]

[0037] ②Pressing and forming: Place the powder obtained in step ① in an abrasive tool, and press it into a spherical shape by cold isostatic pressing;

[0038] ③Sintering: Put the powder in the mold under normal pressure, heat up to 1600°C at a rate of 80°C / min in the sintering furnace, keep it for 1h, stop heating and then cool to room temperature with the furnace;

[0039] ④ Grinding and polishing: the ceramic ball is ground first, and then the workpiece after grinding is polished. The sphericity of the ceramic ball is 0.05 μm and the surface roughness is 0.005 μm.

[0040] The relative density of the obtained ceramic balls is 99.2%, and the fracture toughness is 8.9MPa·m 1 / 2 , Vickers hardness is 21.3GPa, sphericity is 0.05μm, sur...

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Abstract

The invention relates to a silicon nitride ceramic ball, which belongs to the ceramic preparation field. According to the silicon nitride ceramic ball, the relative density of the ceramic ball is 98.8-99.5%, the fracture toughness is 8.0MPa.m<1 / 2>-9.2MPa.m<1 / 2>, and the Vickers hardness is 20.5-21.5 GPa. The sphericity is less than or equal to 0.07mum, and the surface roughness is less than or equal to 0.008mum. The silicon nitride ceramic ball has the advantages of high relative density, high hardness, low friction coefficient, excellent wear resistance, self lubrication and rigidity, and can be widely used as a bearing rolling element.

Description

Technical field [0001] The invention relates to a silicon nitride ceramic ball, which belongs to the field of ceramic preparation. Background technique [0002] Ball bearing is a kind of rolling bearing. The ball is installed between the inner ring and the outer ring and can withstand larger loads. Ceramic balls, especially silicon nitride balls, have the characteristics of low density, high hardness, low friction coefficient, wear resistance, self-lubrication and good rigidity. They are especially suitable for high-speed, high-precision and long-life hybrid ceramic ball bearings. [0003] There are generally three sintering processes for silicon nitride ceramics: hot isostatic pressing (HIP), hot pressing (HP) and atmospheric pressure sintering. [0004] The hot isostatic pressing process is to place the product in a closed container, apply equal pressure to the product in all directions, and apply high temperature at the same time. Under the action of high temperature and high pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584
Inventor 李东炬
Owner 大连大友高技术陶瓷有限公司