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Nanometer silicon carbide fiber-modified C/C sealing material and preparation method thereof

A technology of nano-silicon carbide and sealing materials, applied in the field of nano-silicon carbide fiber modified C/C sealing materials and its preparation, to achieve the effect of ensuring stable friction and enhancing friction performance

Inactive Publication Date: 2016-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although there are relevant records about the use of silicon carbide fibers to modify C / C composite materials, there are few relevant records involving the use of nano-silicon carbide fibers combined with nano-nickel to modify C / C composite materials and use them as sealing materials.

Method used

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  • Nanometer silicon carbide fiber-modified C/C sealing material and preparation method thereof
  • Nanometer silicon carbide fiber-modified C/C sealing material and preparation method thereof
  • Nanometer silicon carbide fiber-modified C/C sealing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In terms of mass percentage, the components of the designed sealing material are:

[0039] Carbon fiber preform + deposited carbon 92.7%;

[0040] Nano Ni 0.3%;

[0041] Nano silicon carbide fiber 7%;

[0042] Wherein the mass ratio of carbon fiber prefabricated body to deposited carbon is 10; 7

[0043] (1) Ultrasonic vibration of the 3D carbon fiber preform in acetone solution for half an hour, soaking for 24 hours, the mass ratio of carbon fiber and acetone solution is 1:12, and then washed repeatedly with deionized water for 8 times and placed in a drying box drying for use;

[0044] (2) Soak the preform obtained in step (1) in 0.2% nickel nitrate solution for 5 hours, take it out and place it in a thermostat at 100° C. for 7 hours and dry it for 7 hours. Then put the preform into the tube furnace, under N 2 Heating to 500°C for calcination in the atmosphere and keeping it for 2 hours to remove NO 3 roots; and then heated to 580 ° C, H 2reduction to obtain ca...

Embodiment 2

[0050] In terms of mass percentage, the components of the designed sealing material are:

[0051] Carbon fiber preform + deposited carbon 94.8%;

[0052] Nano Ni 0.2%;

[0053] Nano silicon carbide fiber 5%;

[0054] Wherein the mass ratio of carbon fiber prefabricated body to deposited carbon is 10; 6

[0055] (1) Ultrasonic vibration of the 3D carbon fiber preform in acetone solution for half an hour, soaking for 24 hours, the mass ratio of carbon fiber and acetone solution is 1:12, and then washed repeatedly with deionized water for 8 times and placed in a drying box drying for use;

[0056] (2) Soak the preform obtained in step (1) in 0.2% nickel nitrate solution for 5 hours, take it out and place it in a thermostat at 100° C. for 7 hours and dry it for 7 hours. Then put the preform into the tube furnace, under N 2 Heating to 500°C for calcination in the atmosphere and keeping it for 2 hours to remove NO 3 roots; and then heated to 580 ° C, H 2 reduction to obtain c...

Embodiment 3

[0062] In terms of mass percentage, the components of the designed sealing material are:

[0063] Carbon fiber preform + deposited carbon 89.6%;

[0064] Nano Ni 0.4%;

[0065] Nano silicon carbide fiber 10%;

[0066] Wherein the mass ratio of carbon fiber prefabricated body to deposited carbon is 10; 6

[0067] (1) Ultrasonic vibration of the 3D carbon fiber preform in acetone solution for half an hour, soaking for 24 hours, the mass ratio of carbon fiber and acetone solution is 1:12, and then washed repeatedly with deionized water for 8 times and placed in a drying box drying for use;

[0068] (2) Soak the preform obtained in step (1) in 0.4% nickel nitrate solution for 5 hours, take it out and place it in a thermostat at 100° C. for 7 hours and dry it. Then put the preform into the tube furnace, under N 2 Heating to 500°C for calcination in the atmosphere and keeping it for 2 hours to remove NO 3 roots; and then heated to 580 ° C, H 2 reduction to obtain catalyst nic...

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Abstract

The invention relates to a nano-silicon carbide fiber modified C / C sealing material and a preparation method thereof, belonging to the technical field of high-performance friction sealing material development. The sealing material designed by the present invention includes the following components in terms of mass percentage: carbon fiber prefabricated body + deposited carbon 86.5-96.99%, nano-Ni0.01-0.5%, nano-silicon carbide fiber 3-13%; the nano-carbonized The silicon fiber is evenly attached to the carbon fiber preform, and the deposited carbon is coated on the surface of the carbon fiber preform, nano-silicon carbide fiber, and Ni to form a dense carbon layer; the Ni is evenly distributed between the dense carbon layer and the carbon In the interval formed by the fiber preform. The preparation method is as follows: first, nano-nickel powder is synthesized in a carbon fiber prefabricated body, and then nano-silicon carbide fibers are obtained by in-situ generation; finally, a finished product is obtained by depositing pyrolytic carbon. The preparation process of the invention is simple, the obtained material has excellent friction performance, and is convenient for industrial application.

Description

technical field [0001] The invention relates to a nano-silicon carbide fiber modified C / C sealing material and a preparation method thereof, belonging to the technical field of high-performance friction sealing material development. Background technique [0002] Carbon fiber reinforced carbon base (abbreviated as carbon / carbon, specifically C / C in this invention) composite material is a new type of high-performance composite material with high specific modulus, high specific strength, high temperature resistance, corrosion resistance, and thermal shock resistance. And a series of points, in aviation, aerospace and other fields have more and more widely used. The sealing part of the aeroengine has a crucial influence on the working performance and reliability of the entire engine. The inter-shaft sealing material used for aero-engines, which rotates at a relatively high speed with the sealed runway, uses its contact with the sealed runway to form a very small gap to limit th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622
CPCC04B35/83C04B35/622C04B2235/405C04B2235/5244C04B2235/614
Inventor 陈洁刘如铁熊翔肖鹏
Owner CENT SOUTH UNIV
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