Preparation method of Y2Si2O7 crystal whisker toughening Y4Si3O12 composite coatings

A composite coating and whisker technology, applied in the field of carbon/carbon composite materials, can solve the problems of thermal expansion coefficient difference, matrix oxidation, microcracks and holes, etc., to achieve improved bonding force, uniform coating, no microcracks Effect

Active Publication Date: 2013-12-25
吴文婕
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Problems solved by technology

[0005] Existing literature [Huang JF, Li HJ, Zeng XR, et al.A new SiC / yttrium silicate / glassmulti-layer oxidation protective coating for carbon / carbon composites[J].Carbon,2004,42(11):2356-2359 .] reported that both single and multiphase yttrium silicate coatings can effectively protect C / C under certain temperature conditions, but due to the difference in thermal expansion coefficient between the SiC layer and the outer coating, it is inevitable During the anti-oxidation process, micro-cracks and holes will be generated, and these defects will lead to the penetration of oxygen in the low temperature section, thereby oxidizing the matrix to a certain extent

Method used

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  • Preparation method of Y2Si2O7 crystal whisker toughening Y4Si3O12 composite coatings

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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 25×25×25mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 40°;

[0035] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3 to 5 times respectively. The ultrasonic time for each cleaning is 30min, and the ultrasonic power is 120W. Finally, dry it in an electric blast drying oven at 60°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 WO with a particle size of 30-40 μm 3 Powder, according to Si powder: C powder: WO 3 Powder = 4:4:1.0 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;

[0038] 2) Next...

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 30×30×30mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 50°;

[0053] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3 to 5 times respectively. The ultrasonic time for each cleaning is 40min, and the ultrasonic power is 140W. Finally, dry it in an electric blast drying oven at 65°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 WO with a particle size of 30-40 μm 3 Powder, according to Si powder: C powder: WO 3 Powder=3.5:5:1.5 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into graphite crucible, and embed it in the embedding powder;

[0056] 2) Next, ...

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 28×28×28mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 45°;

[0070] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3~5 times respectively. The ultrasonic time for each cleaning is 50min, and the ultrasonic power is 160W. Finally, dry it in an electric blast drying oven at 70°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 WO with a particle size of 30-40 μm 3 Powder, according to Si powder: C powder: WO 3 Powder = 3:4.5:1.3 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) Next,...

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Abstract

The invention relates to a preparation method of Y2Si2O7 crystal whisker toughening Y4Si3O12 composite coatings. According to the preparation method, firstly, an embedding method is adopted for preparing a SiC (silicon carbide) porous inner coating on the base body surface of a C / C (carbon / carbon) composite material, then, Y2Si2O7 crystal whiskers are prepared, in addition, composite surfactants are adopted for carrying out surface modification on the Y2Si2O7 crystal whiskers, and mixed liquid is obtained; and the C / C composite material with the SiC porous inner coating prepared on the surface and the mixed liquid are adopted for carrying out ultrasonic electrophoresis selective assembly deposition, a Y2Si2O7 crystal whisker pinning layer is obtained, and finally, the Y2Si2O7 crystal whisker toughening Y4Si3O12 composite coatings are prepared by a hydrothermal electrophoretic deposition method. The preparation method has the advantages that the Y2Si2O7 crystal whiskers are introduced between a Y4Si3O12 outer coating and the SiC inner coating, the more excellent thermal expansion coefficient matching degree is realized, the bonding force between the inner coating and the outer coating as well as between the base body and the inner coating can be enhanced, the low coating cracking and stripping at high temperature can be effectively avoided, and the more excellent high-temperature antioxidation performance is realized.

Description

technical field [0001] The invention belongs to the field of carbon / carbon composite materials, and relates to the preparation of a high-temperature anti-oxidation coating, in particular to a Y 2 Si 2 o 7 Whisker Toughened Y 4 Si 3 o 12 Composite coating and method for its preparation. 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 making full use o...

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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