A pressureless sintering process for silicon carbide ceramics

A silicon carbide ceramic and process technology, applied in the field of silicon carbide ceramics, can solve problems such as low friction coefficient and other workpiece wear, and achieve the effects of reducing defects, improving hardness and toughness, and improving friction performance.

Active Publication Date: 2020-11-20
宁波市飞固密封科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the low friction coefficient of the existing silicon carbide ceramic materials cannot meet the requirements of all rotating lubrication or rotating sealing workpieces. It still has a large wear on other workpieces and requires the use of additional lubricants, so it needs to be improved.

Method used

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  • A pressureless sintering process for silicon carbide ceramics
  • A pressureless sintering process for silicon carbide ceramics
  • A pressureless sintering process for silicon carbide ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0054] as attached figure 1 As shown, the pressureless sintering process of silicon carbide ceramics includes the following steps:

[0055] Step 1: Weigh and mix the silicon carbide powder and additive powder, and obtain a premix after mixing evenly;

[0056] Step 2: Weighing the graphite powder and adding it to the pre-mixture obtained in Step 1 and mixing, and mixing uniformly to obtain a raw material mixture;

[0057] Step 3: Mix sodium alginate and water to obtain a hydrogel, then add the raw material mixture to the hydrogel, stir while adding the materials, and stir it evenly to obtain a dispersion mixture; place the dispersion mixture in a spray drying tower for spray granulation , the pumping pressure is 3.2MPa, the inlet temperature is controlled at 215°C, and the outlet temperature is 45°C to obtain raw material powder; the raw material powder is put into a mixer and then stirred and mixed evenly, put into a barrel and sealed for 10 hours; the mixed The uniform and ...

Embodiment 2

[0084] A pressureless sintering process for silicon carbide ceramics, based on the first embodiment, the difference is that in step four, water washing and drying are performed after the green body is sintered and cooled.

[0085] Embodiments 2A-2B were designed according to the above-mentioned pressureless sintering process of silicon carbide ceramics, and the specific parameters are shown in the table below.

[0086]

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Abstract

The invention relates to a silicon carbide ceramic production process, and discloses a silicon carbide ceramic pressureless sintering process, which solves the problem that the existing silicon carbide ceramic material cannot meet the requirements of all rotating lubrication or rotating sealing workpieces. The process is characterized in that the silicon carbide ceramic pressureless sintering process comprises the following steps of 1, mixing silicon carbide powder material and auxiliary agent powder; after the uniform mixing, thus obtaining a premixture; 2, adding graphite into the premixtureobtained in the first step for mixing; after the uniform mixing, thus obtaining a raw material mixture; 3, using the raw material mixture obtained in the second step to obtain a biscuit; 4, performing pressureless sintering on the biscuit to obtain a product of the silicon carbide ceramic. The silicon carbide ceramic material with good lubrication performance can be produced by the obtained product of the silicon carbide ceramic.

Description

technical field [0001] The invention relates to the field of silicon carbide ceramics, in particular to a pressureless sintering process of silicon carbide ceramics. Background technique [0002] Silicon carbide ceramic is an excellent material, which not only has excellent mechanical properties at room temperature, such as high bending strength, excellent oxidation resistance, good corrosion resistance, high wear resistance and low friction coefficient, but also high temperature mechanical properties. The properties (strength, creep resistance, etc.) are among the best known ceramic materials. Existing silicon carbide ceramics are used in the fields of rotation lubrication and rotation sealing due to their performance. For example, the Chinese patent "a polymer composite silicon carbide ceramic bushing for pumps" with the authorized announcement number CN207131628U, and the Chinese patent with the authorized announcement number CN201461438U The patent "a chemical shielded ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/63C04B35/636C04B35/64
CPCC04B35/565C04B35/622C04B35/6303C04B35/636C04B35/64C04B2235/3821C04B2235/3826C04B2235/425C04B2235/658
Inventor 徐军施永跃
Owner 宁波市飞固密封科技有限公司
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