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Multiphase composite reinforced low-friction silicon carbide ceramic sealing material and preparation method thereof

A technology of friction silicon carbide and silicon carbide ceramics, which is applied in the field of low-friction silicon carbide ceramic sealing materials and its preparation, can solve the problems of less attention to the friction performance of composite materials, limited synergistic enhancement effect, and complicated hot-pressing sintering process, etc., to achieve Improve the mechanical properties and friction properties, improve the surface smoothness, improve the effect of comprehensive performance

Active Publication Date: 2020-05-12
浙江东新新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it should be seen from the existing research that after the addition of graphene, the mechanical properties of silicon carbide ceramics still decline rapidly with the increase of graphene addition. The synergistic enhancement effect is limited; in terms of sintering methods, pressureless solid-phase sintering, reaction sintering and hot-press sintering processes are mainly used. The solid-phase sintering temperature is high, the residual silicon in reaction sintering is relatively large, and the hot-press sintering process is complicated and the equipment cost is high. ; In terms of performance, they all pay attention to the mechanical, mechanical, electrical and thermal properties of composite materials, and pay less attention to the friction properties of composite materials

Method used

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  • Multiphase composite reinforced low-friction silicon carbide ceramic sealing material and preparation method thereof
  • Multiphase composite reinforced low-friction silicon carbide ceramic sealing material and preparation method thereof
  • Multiphase composite reinforced low-friction silicon carbide ceramic sealing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, a multi-phase composite reinforced low-friction silicon carbide ceramic sealing material, its raw materials are composed of the following components by weight: silicon carbide powder 86%, yttrium aluminum garnet powder 8%, graphene 2.5%, nanometer diboron Zirconium 1%, silicon carbide whiskers 2.5%.

[0037] The preparation method is to carry out the following steps in sequence:

[0038] 1), in the raw material of 100 parts by weight, add 110 parts by weight of deionized water as dispersion medium, 4 parts by weight of tetramethylammonium hydroxide as dispersant, 4 parts by weight of polyvinyl alcohol as binder, adopt wet The French vertical stirring mill stirred for 4 hours, then added 3 parts by weight of n-octanol as a defoamer, and stirred for another 30 minutes to prepare a water-based composite slurry;

[0039] 2) The prepared water-based composite slurry is spray-dried with a high-speed centrifugal spray dryer. The hot air inlet temperature is 200-...

Embodiment 2

[0043] Embodiment 2, a multi-phase composite reinforced low-friction silicon carbide ceramic sealing material, the weight percentage of the composite ceramic consists of: silicon carbide powder 88%, yttrium aluminum garnet powder 6%, graphene 1.5%, nano diboride Zirconium 2.5%, silicon carbide whiskers 2%.

[0044] The preparation method is identical to Example 1.

[0045] The prepared multi-phase composite reinforced low-friction silicon carbide ceramic sealing material has a density of 2.98-3.05g / cm 3 , flexural strength 400 ~ 420MPa, Vickers hardness 22GPa, dry friction coefficient 0.23.

Embodiment 3

[0046] Embodiment 3, a multi-phase composite reinforced low-friction silicon carbide ceramic sealing material, the weight percentage of the composite ceramic consists of: silicon carbide powder 87%, yttrium aluminum garnet powder 7%, graphene 2.5%, nano diboride Zirconium 2.5%, silicon carbide whiskers 1.0%.

[0047] The preparation method is identical to Example 1.

[0048] The prepared multi-phase composite reinforced low-friction silicon carbide ceramic sealing material has a density of 2.95-3.0 g / cm 3 , flexural strength 380 ~ 390MPa, Vickers hardness 21GPa, dry friction coefficient 0.22.

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Abstract

The invention discloses a multiphase composite reinforced low-friction silicon carbide ceramic sealing material. The low-friction silicon carbide ceramic sealing material is composed of the followingraw materials in percentage by weight: 86%-88% of silicon carbide, 6%-8% of yttrium aluminum garnet, 1%-2.5% of graphene, 1%-2.5% of nanometer zirconium diboride and 1%-2.5% of silicon carbide whiskers. The invention also provides a preparation method of the low-friction silicon carbide ceramic sealing material. The prepared silicon carbide ceramic sealing material is low in friction coefficient and high in mechanical property.

Description

technical field [0001] The invention relates to a multi-phase composite reinforced low-friction silicon carbide ceramic sealing material and a preparation method thereof. Background technique [0002] As a typical covalently bonded ceramic material, silicon carbide ceramics have excellent properties such as low density, high strength, high hardness, wear resistance, corrosion resistance and high temperature resistance. been widely used. For example, used as high-temperature, wear-resistant, corrosion-resistant mechanical seal components, various grinding wheels and abrasive tools, substrate materials for high-efficiency heat exchangers and large-capacity ultra-large-scale integrated circuits, atomic reactor structural materials, rocket exhaust nozzles , Rocket combustion chamber lining, reflector body, etc. Now silicon carbide is more and more valued by countries all over the world, especially in the field of high-temperature structural ceramics, which has become a researc...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
CPCC04B35/565C04B35/622C04B2235/3222C04B2235/3225C04B2235/3813C04B2235/422C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/5276C04B2235/526C04B2235/5264C04B2235/5427C04B2235/602C04B2235/656C04B2235/6567C04B2235/6581C04B2235/96C04B2235/77
Inventor 郭兴忠邹畅王睿陆子介郑浦郑奔杨辉
Owner 浙江东新新材料科技有限公司
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