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Method for preparing Y2Si2O7 whisker-toughened mullite composite coating

A composite coating and mullite technology, applied in the field of C/C composite materials, can solve the problems of unreachable, easy to fall off, oxidation protection time, etc., and achieve the effects of small oxidation weight loss rate, good interface bonding and low temperature

Active Publication Date: 2013-02-13
杨洁如
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned coatings still cannot meet the practical application requirements under the condition of 1600-2500°C high-speed ion flow erosion, and the high-temperature oxidation-resistant ceramic coating of carbon / carbon composite materials is easy to fall off and the oxidation protection time is short in the high-speed gas erosion environment.

Method used

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  • Method for preparing Y2Si2O7 whisker-toughened mullite composite coating

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Experimental program
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Effect test

Embodiment 1

[0033] Step 1: C / C composite material pretreatment package:

[0034] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 30×30×30mm 3 Cube, and polished and chamfered the surface, the chamfer is 50°;

[0035] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3~5 times respectively, the ultrasonic time for each cleaning is 50min, the ultrasonic power is 200W, and finally it is dried in an electric heating blast drying box at 70℃.

[0036] Step 2: Prepare SiC porous inner coating on the surface of C / C composite material by embedding method

[0037] 1) First, take commercially available analytically pure Si powder, C powder and WO with a particle size of 40~50μm 3 Powder, according to Si powder: C powder: WO 3 Powder=4:4:1.8 to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible and embed it in the embedding powder;

[0038] 2) Secondly, put the graphite crucible into...

Embodiment 2

[0051] Step 1: C / C composite material pretreatment package:

[0052] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 33×33×33mm 3 Cube, and polished and chamfered the surface, the chamfer is 55°;

[0053] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3~5 times, each time the ultrasonic time is 65min, the ultrasonic power is 160W, and finally it is dried in an electric blast drying oven at 75℃.

[0054] Step 2: Prepare SiC porous inner coating on the surface of C / C composite material by embedding method

[0055] 1) First, take commercially available analytically pure Si powder, C powder and WO with a particle size of 40~50μm 3 Powder, according to Si powder: C powder: WO 3 Powder=3.5:5:2 to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible, and embed it in the embedding powder;

[0056] 2) Secondly, put the graphite crucible in a vertical vacuum furnace, p...

Embodiment 3

[0068] Step 1: C / C composite material pretreatment package:

[0069] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 35×35×35mm 3 Cube, and polished and chamfered the surface, the chamfer is 60°;

[0070] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3~5 times, each cleaning ultrasonic time is 80min, ultrasonic power is 180W, and finally dried in an electric heating blast drying oven at 80℃.

[0071] Step 2: Prepare SiC porous inner coating on the surface of C / C composite material by embedding method

[0072] 1) First, take commercially available analytically pure Si powder, C powder and WO with a particle size of 40~50μm 3 Powder, according to Si powder: C powder: WO 3 Powder=3:4.5:1.5 to prepare embedding powder, and then put the pretreated carbon / carbon composite material into a graphite crucible and embed it in the embedding powder;

[0073] 2) Secondly, put the graphite crucible into a vertical vacuum furna...

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Abstract

The invention relates to a method for preparing a Y2Si2O7 whisker-toughened mullite composite coating. The method comprises the following steps: preparing a SiC porous internal coating on the matrix surface of a C / C composite material through an embedding method, preparing Y2Si2O7 whiskers, and then performing surface modification to the Y2Si2O7 whiskers with a composite surface active agent to obtain a mixed liquor; and performing ultrasonic electrophoretic selective assembly deposition to the C / C composite material prepared with the SiC porous internal coating and the mixed liquor to obtain a Y2Si2O7 whisker pinning layer, and finally preparing the Y2Si2O7 whisker-toughened mullite composite coating through a hydrothermal electrophoretic deposition method. Compared with other coatings, the prepared Y2Si2O7 whisker-toughened mullite composite coating can effectively increase the oxidation-resistance temperature, can realize the anti-oxidation protection of 400 hours for the C / C composite material under the condition of dynamic brush of high temperature (1700 DEG C) gas, and the oxidation loss rate is lower than 0.77 percent.

Description

Technical field [0001] The invention belongs to the technical field of C / C composite materials, relates to a method for preparing a high-temperature oxidation-resistant coating of C / C composite materials, and specifically relates to a Y 2 Si 2 O 7 Preparation method of whisker toughened mullite composite coating. Background technique [0002] Carbon / carbon (C / C) composite materials have excellent properties such as low thermal expansion coefficient, low density, high temperature resistance, ablation resistance, high strength, and high modulus, especially their strength and modulus under the conditions of 2200℃ in an inert atmosphere. The excellent performance that the amount increases with the increase of temperature makes it have broad application prospects in the aerospace field. However, C / C composite materials will be oxidized in an aerobic environment over 450°C, and the loss of oxidized quality will reduce its strength, which limits its practical application. Therefore, so...

Claims

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Application Information

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IPC IPC(8): C04B35/81C04B41/89
Inventor 黄剑锋杨柳青曹丽云王雅琴费杰
Owner 杨洁如
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