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Preparation method of Y2Si2O7 whisker toughened Y2SiO5 composite coating

A composite coating and whisker technology, which is applied in the field of preparation of high-temperature anti-oxidation coatings, can solve the problems of thermal expansion coefficient difference, substrate oxidation, micro-cracks and holes, etc. The effect of microcracks

Active Publication Date: 2013-02-20
鄢三元
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 whisker toughened Y2SiO5 composite coating

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Experimental program
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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 20×20×20mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 30°;

[0035] 2) Then use deionized water and absolute ethanol to ultrasonically clean 4 times respectively, the ultrasonic time for each cleaning is 10min, the ultrasonic power is 80W, and finally dry in an electric blast drying oven at 50°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 20-30 μm 3 Powder, according to Si powder: C powder: WO 3 Powder=3:4.5:0.5 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into graphite crucible, and embed it in the embedding powder;

[0038] 2) Next, put the gr...

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 23×23×23mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 35°;

[0053] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3 times respectively, the ultrasonic time of each cleaning is 20min, the ultrasonic power is 100W, and finally dry in an electric blast drying oven at 55°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 20-30 μm 3 Powder, according to Si powder: C powder: WO 3 Powder = 4:4:0.8 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) Next, put the ...

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

[0070] 2) Then use deionized water and absolute ethanol to ultrasonically clean 5 times respectively, the ultrasonic time of each cleaning is 30min, the ultrasonic power is 120W, and finally dry in an electric blast drying oven at 60°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 20-30 μm 3 Powder, according to Si powder: C powder: WO 3 Powder=3.5:5:1.0 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into graphite crucible, and embed it in the embedding powder;

[0073] 2) Next, put the gr...

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Abstract

Provided is a preparation method of a Y2Si2O7 whisker toughened Y2SiO5 composite coating. The method includes that first, a SiC porous inner coating is prepared on the surface of a C / C composite material substrate through an embedding method, and then Y2Si2O7 whisker is prepared, surface modification is conducted on the Y2Si2O7 whisker by using a composite surface active agent to obtain mixed liquid; the C / C composite material with SiC porous inner coating prepared on the surface and the mixed liquid are adopted for ultrasonic electrophoresis selectively assembling and depositing to obtain a Y2Si2O7 whisker pinning layer, and finally the Y2Si2O7 whisker toughened Y2SiO5 composite coating is prepared through hydrothermal electrophoretic deposition method. The Y2Si2O7 whisker toughened Y2SiO5 composite coating is even, compact, free of microscopic cracks, and binding force between the substrate and the inner coating and between the inner coating and an outer coating is remarkably improved. The Y2Si2O7 whisker toughened Y2SiO5 composite coating can conduct effective anti-oxidation protection on the C / C composite material for 300h in static air at the temperature of 1800 DEG C, and oxidization weightless rate is smaller than 0.45%.

Description

technical field [0001] The invention relates to the preparation of a high-temperature anti-oxidation coating, in particular to a Y 2 Si 2 o 7 Whisker Toughened Y 2 SiO 5 Preparation method of 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 making full use of their properties. [0003] There are two main ways to improve the oxidati...

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 鄢三元
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