Method for preparing Y2SiO5 whisker toughened Y2SiO5 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 effects of less than oxidation weight loss, no microcracks, and improved bonding force

Active Publication Date: 2014-04-16
吴文婕
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  • Abstract
  • Description
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Problems solved by technology

[0005] 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.] et al 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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  • Method for preparing Y2SiO5 whisker toughened Y2SiO5 composite coatings

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Experimental program
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Effect test

Embodiment 1

[0034] Step 1: C / C composite material pretreatment:

[0035] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 6×6×6mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 30°;

[0036] 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;

[0037] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0038] 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 = 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;

[0039] 2) Next, put the graph...

Embodiment 2

[0052] Step 1: C / C composite material pretreatment:

[0053] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 9×9×9mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 40°;

[0054] 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 dried in an electric blast drying oven at 65°C;

[0055] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0056] 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 = 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;

[0057] 2) Next, put th...

Embodiment 3

[0069] Step 1: C / C composite material pretreatment:

[0070] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 12×12×12mm 3 The cube, and its surface treatment of grinding and chamfering, the chamfering is 50°;

[0071] 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 80°C;

[0072] Step 2: Prepare SiC porous inner coating on the surface of C / C composite substrate by embedding method

[0073] 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=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;

[0074] 2) Next, put the gr...

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Abstract

The invention discloses a method for preparing Y2SiO5 whisker toughened Y2SiO5 composite coatings, which comprises the following steps: preparing a SiC porous internal coating on the surface of a C / C composite material base by using an embedding method; preparing a Y2SiO5 whisker, and carrying out surface modification on the Y2SiO5 whisker by using a compound surfactant; carrying out ultrasonic electrophoretic selective assembly and deposition to obtain a Y2SiO5 whisker pinning layer; and preparing a Y2SiO5 whisker toughened Y2SiO5 composite coating by using a hydrothermal electrophoretic deposition method. The Y2SiO5 whisker toughened Y2SiO5 composite coating prepared by using the method disclosed by the invention is uniform, compact, and has no microcrack; and the binding force of the base with an internal coating and an external coating is significantly improved. The Y2SiO5 whisker toughened Y2SiO5 composite coating prepared by using the method disclosed by the invention can carry out 200-hour effective anti-oxidation protection on C / C composite material in 1900 DEG C static air, and the oxidization weight loss rate is less than 0.9%.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature anti-oxidation coating, in particular to a Y 2 SiO 5 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 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 ...

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 吴文婕
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