Preparation method of Y2Si2O7 crystal whisker toughening Y2Si2O7 composite coatings

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 micro-cracks and holes, matrix oxidation, differences in thermal expansion coefficients, etc. The effect of cracking and peeling

Active Publication Date: 2014-01-29
鄢三元
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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 Y2Si2O7 composite coatings

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: C / C Composite Pretreatment:

[0036] 1) Take the 2D-carbon / carbon composite material for aircraft brake pads and process it into 8×8×8mm 3 The cube is polished and chamfered, and the chamfer is 30°;

[0037] 2) Then ultrasonically cleaned with deionized water and absolute ethanol for 3 times respectively, each cleaning ultrasonic time was 20min, ultrasonic power was 80W, and finally dried in an electric heating blast drying oven at 70°C.

[0038] Step 2: Preparation of SiC porous inner coating on the surface of C / C composite matrix by embedding method

[0039] 1) First, take commercially available analytically pure Si powder, C powder and ZrO powder with a particle size of 20~30μm, and prepare the embedding powder according to the mass ratio of Si powder:C powder:ZrO powder=2:3:0.5, and then Put the pretreated carbon / carbon composite material into a graphite crucible and embed it in the embedding powder;

[0040] 2) Secondly, put the graphite crucible into th...

Embodiment 2

[0053] Step 1: C / C Composite Pretreatment:

[0054] 1) Take the 2D-carbon / carbon composite material for aircraft brake pads and process it into 12×12×12mm 3 The cube, and the surface treatment of grinding and chamfering, the chamfering angle is 40°;

[0055] 2) Then ultrasonically cleaned with deionized water and absolute ethanol for 4 times respectively, each cleaning ultrasonic time was 30min, ultrasonic power was 100W, and finally dried in an electric heating blast drying oven at 50 °C.

[0056] Step 2: Preparation of SiC porous inner coating on the surface of C / C composite matrix by embedding method

[0057] 1) First, take commercially available analytically pure Si powder, C powder and ZrO powder with a particle size of 20~30μm, and prepare the embedding powder according to the mass ratio of Si powder:C powder:ZrO powder=3:3.5:0.8, and then Put the pretreated carbon / carbon composite material into a graphite crucible and embed it in the embedding powder;

[0058] 2) Secon...

Embodiment 3

[0070] Step 1: C / C Composite Pretreatment:

[0071] 1) Take the 2D-carbon / carbon composite material for aircraft brake pads and process it into 16×16×16mm 3 The cube is ground and chamfered, and the chamfer is 50°;

[0072] 2) Then ultrasonically cleaned with deionized water and absolute ethanol for 5 times, each cleaning ultrasonic time was 10min, ultrasonic power was 120W, and finally dried in an electric heating blast drying oven at 80 °C.

[0073] Step 2: Preparation of SiC porous inner coating on the surface of C / C composite matrix by embedding method

[0074] 1) First, take commercially available analytically pure Si powder, C powder and ZrO powder with a particle size of 20~30μm, and prepare the embedding powder according to the mass ratio of Si powder:C powder:ZrO powder=2.5:4:1.0, and then Put the pretreated carbon / carbon composite material into a graphite crucible and embed it in the embedding powder;

[0075] 2) Secondly, put the graphite crucible into the vertic...

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Abstract

The invention relates to a preparation method of Y2Si2O7 crystal whisker toughening Y2Si2O7 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 Y2Si2O7 composite coatings are prepared by a hydrothermal electrophoretic deposition method. The Y2Si2O7 crystal whisker toughening Y2Si2O7 composite coatings provided by the invention introduce the Y2Si2O7 crystal whiskers between a Y2Si2O7 outer coating and a Y2Si2O7 inner coating, the excellent thermal expansion coefficient matching degree and the physical and chemical compatibility are realized, the bonding force between the inner coating and the outer coating as well as between the base body and the inner coating is enhanced, the low coating cracking and stripping at high temperature can be effectively avoided, and the more excellent high-temperature antioxidation performance is realized. The 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.

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 toughening Y 2 Si 2 O 7 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, and high modulus, especially their strength and modulus under the condition of less than 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 composites are oxidized in an aerobic environment above 450 °C, and the loss of oxidative mass leads to a decrease in their strength, limiting their practical applications. Therefore, solving the problem of high temperature oxidation prevention of C / C composites is the key t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
Inventor 黄剑锋杨柳青曹丽云王雅琴费杰
Owner 鄢三元
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