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Preparation method of Y2SiO5 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 problems such as unsatisfactory bonding conditions, and achieve the effect of less than oxidation weight loss, uniform composite coating, and no microcracks

Active Publication Date: 2013-02-27
鄢三元
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Huang Jianfeng[Huang JF, Li HJ, Zeng XR, et al.Preparation and oxidation kinetics mechanism of three layer multi-layer coatings coated carbon / carbon composites[J].Surface and Coating Technology,2006,200(18-19):5379- 5385.] and others developed Y 2 SiO 5 / Y 2 Si 2 o 7 Glass composite coating, the composite coating has passed the anti-oxidation test for 200h in static air at 1700°C, and the oxidation weight loss is only 2.87×10 -3 g / cm 2 , but the bonding between the inner and outer coatings is not very ideal, which has become a key issue restricting the oxidation resistance of the coating

Method used

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  • Preparation method of Y2SiO5 crystal whisker toughening Y2Si2O7 composite coatings

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: C / C composite material pretreatment:

[0036] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 5×5×5mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 30°;

[0037] 2) Then use deionized water and absolute ethanol to ultrasonically clean 3 times respectively, the ultrasonic time for each cleaning is 30min, the ultrasonic power is 80W, and finally dry in an electric blast drying oven at 50°C;

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

[0039] 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 = 1:2:0.5 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into graphite crucible, and embed it in the embedding powder;

[0040] 2) Ne...

Embodiment 2

[0053] Step 1: C / C composite material pretreatment:

[0054] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 7×7×7mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 40°;

[0055] 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 100W, and finally dry in an electric blast drying oven at 55°C;

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

[0057] 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 = 1.5:3:0.8 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;

[0058]2...

Embodiment 3

[0070] Step 1: C / C composite material pretreatment:

[0071] 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 35°;

[0072] 2) Then use deionized water and absolute ethanol to ultrasonically clean 5 times respectively, the ultrasonic time of each cleaning is 20min, the ultrasonic power is 120W, and finally dry in an electric blast drying oven at 60°C;

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

[0074] 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=2:2.5:1.0 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into graphite crucible, and embed it in the embedding powder;

[0075] 2)...

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Abstract

The invention relates to a preparation method of Y2SiO5 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, Y2SiO5 crystal whiskers are prepared, in addition, composite surfactants are adopted for carrying out surface modification on the Y2SiO5 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 Y2SiO5 crystal whisker pinning layer is obtained, and finally, the Y2SiO5 crystal whisker toughening Y2Si2O7 composite coatings are prepared by a hydrothermal electrophoretic deposition method. The Y2SiO5 crystal whisker toughening Y2Si2O7 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 Y2SiO5 crystal whisker toughening Y2Si2O7 composite coatings can realize the effective oxidation protection on the C / C composite material for 200 hours in static air at 1800 DEG C, and the oxidation weightless rate is smaller than 0.5 percent.

Description

technical field [0001] The invention relates to the preparation of a high-temperature anti-oxidation coating, in particular to a Y 2 SiO 5 Whisker Toughened 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, 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 wide application in an oxidizing atmosphere. 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(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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