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Preparation method of Y4Si3O12 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 easy falling off, oxidation protection time, and failure to reach, and achieve the effects of good interface bonding, strong cohesion, and short preparation cycle

Active Publication Date: 2014-04-16
吴文婕
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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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  • Preparation method of Y4Si3O12 whisker toughened mullite composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0034] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 50×50×50mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 55°;

[0035] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3 times respectively, the ultrasonic time for each cleaning is 80min, the ultrasonic power is 200W, and finally dry in an electric blast drying oven at 70°C;

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

[0037] 1) First, take commercially available analytically pure Si powder, C powder and B powder with a particle size of 40-50 μm 2 o 3 Powder, according to Si powder: C powder: B 2 o 3 Powder = 3:5:1.8 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into graphite crucible, and embed it in the embedding powder;

[0038] 2) ...

Embodiment 2

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

[0052] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 45×45×45mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 60°;

[0053] 2) Then use deionized water and absolute ethanol to ultrasonically clean 4 times respectively, the ultrasonic time of each cleaning is 50min, the ultrasonic power is 180W, and finally dry in an electric blast drying oven at 75°C;

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

[0055] 1) First, take commercially available analytically pure Si powder, C powder and B powder with a particle size of 40-50 μm 2 o 3 Powder, according to Si powder: C powder: B 2 o 3 Powder = 4:6:2 mass ratio 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) Nex...

Embodiment 3

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

[0069] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 48×48×48mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 50°;

[0070] 2) Then use deionized water and absolute ethanol to ultrasonically clean 5 times respectively, the ultrasonic time of each cleaning is 60min, the ultrasonic power is 160W, and finally dry in an electric blast drying oven at 80°C;

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

[0072] 1) First, take commercially available analytically pure Si powder, C powder and B powder with a particle size of 40-50 μm 2 o 3 Powder, according to Si powder: C powder: B 2 o 3 Powder = 5:4:1.5 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible, and embed it in the embedding powder;

[0073] 2)...

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Abstract

The invention discloses a preparation method of an Y4Si3O12 whisker toughened mullite composite coating. The preparation method comprises the following steps of: preparing a SiC porous internal coating on the surface of a C / C composite material substrate by using an embedding method; preparing Y4Si3O12 whisker and performing surface modification on the Y4Si3O12 whisker by using composite surfactant to obtain mixed solution; performing ultrasonic electrophoresis selective assembly and deposition by using the C / C composite material prepared with the SiC porous internal coating on the surface and the mixed solution to obtain a Y4Si3O12 whisker pinning layer; and finally preparing the Y4Si3O12 whisker toughened mullite composite coating by using a hydrothermal electrophoretic deposition method. Compared with other coatings, the Y4Si3O12 whisker toughened mullite composite coating has the advantages that the anti-oxidation temperature can be effectively improved, anti-oxidation protection of 450 hours for the C / C composite material can be achieved under the high-temperature gas dynamic erosion condition of 1,500 DEG C, and the oxidation weight loss ratio is less than 0.62 percent.

Description

technical field [0001] The invention belongs to the technical field of C / C composite materials, and relates to a method for preparing a high-temperature anti-oxidation coating of C / C composite materials, in particular to a Y 4 Si 3 o 12 Preparation method of whisker toughened mullite composite coating. Background technique [0002] Carbon / carbon (C / C) composites have excellent properties such as low thermal expansion coefficient, low density, high temperature resistance, ablation resistance, high strength, high modulus, etc. 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 composites will be oxidized in an aerobic environment exceeding 450 °C, and the loss of oxidized mass will lead to a decrease in its strength, which limits its practical application. Therefore, solving the problem of high-temperature oxidation resistance of C / C composites is the key to mak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/81C04B41/89
Inventor 黄剑锋杨柳青曹丽云王雅琴费杰
Owner 吴文婕
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