Preparation method of Y4Si3O12 crystal whisker toughening Y4Si3O12 composite coatings

A composite coating and whisker technology, which is 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 effect of no micro-cracks, less oxidation weight loss rate, and improved bonding force

Active Publication Date: 2013-12-25
鄢三元
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the above-mentioned coatings do not meet the practical application requirements under the condition of 1600~2500°C high-speed ion flow erosion. 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 crystal whisker toughening Y4Si3O12 composite coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: C / C composite material pretreatment:

[0033] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 15×15×15mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 30°;

[0034] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3 to 5 times respectively. The ultrasonic time for each cleaning is 20min, and the ultrasonic power is 80W. Finally, dry it in an electric blast drying oven at 50°C.

[0035] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0036] 1) First, take commercially available analytically pure Si powder, C powder and Cr powder with a particle size of 20-30 μm 2 o 3 Powder, according to Si powder: C powder: Cr 2 o 3 Powder = 4:5.5:0.5 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into graphite crucible, and embed it in the embedding powder; ...

Embodiment 2

[0050] Step 1: C / C composite material pretreatment:

[0051]1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 10×10×10mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 40°;

[0052] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3~5 times respectively. The ultrasonic time for each cleaning is 30min, and the ultrasonic power is 100W. Finally, dry it in an electric blast drying oven at 65°C.

[0053] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0054] 1) First, take commercially available analytically pure Si powder, C powder and Cr powder with a particle size of 20-30 μm 2 o 3 Powder, according to Si powder: C powder: Cr 2 o 3 Powder = 5:5:0.8 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;

[...

Embodiment 3

[0067] Step 1: C / C composite material pretreatment:

[0068] 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 50°;

[0069] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3 to 5 times respectively. The ultrasonic time for each cleaning is 10 minutes, and the ultrasonic power is 120W. Finally, dry it in an electric blast drying oven at 80°C.

[0070] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0071] 1) First, take commercially available analytically pure Si powder, C powder and Cr powder with a particle size of 20-30 μm 2 o 3 Powder, according to Si powder: C powder: Cr 2 o 3 Powder = 4.5:6:1.0 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible, and embed it in the embedding p...

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Abstract

The invention relates to a preparation method of Y4Si3O12 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, Y4Si3O12 crystal whiskers are prepared, in addition, composite surfactants are adopted for carrying out surface modification on the Y4Si3O12 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 Y4Si3O12 crystal whisker pinning layer is obtained, and finally, the Y4Si3O12 crystal whisker toughening Y4Si3O12 composite coatings are prepared by a hydrothermal electrophoretic deposition method. The Y4Si3O12 crystal whisker toughening Y4Si3O12 composite coatings prepared by the preparation method are uniform and compact, no microscopic cracks exist, and the bonding force between the base body and the inner coating as well as between the inner coating and the outer coating is obviously improved. The prepared Y4Si3O12 crystal whisker toughening Y4Si3O12 composite coatings can realize the effective protection on the C / C composite material for 350 hours in static air at 1700 DEG C, and the oxidation weightless rate is smaller than 0.8 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 Whisker Toughened Y 4 Si 3 o 12 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 k...

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 鄢三元
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