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Preparation method of composite material of barium strontium aluminum containing silicate/mullite/SiC three-layer composite structural coating

A barium strontium aluminosilicate and composite material technology, which is applied in the field of composite material preparation, can solve the problems of long preparation period, high cost, complicated equipment and the like, and achieves the effect of excellent oxidation/corrosion protection performance

Active Publication Date: 2016-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The plasma spraying process equipment is complicated and the cost is high; the slurry impregnation has the disadvantages of long preparation period and poor coating performance.

Method used

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  • Preparation method of composite material of barium strontium aluminum containing silicate/mullite/SiC three-layer composite structural coating
  • Preparation method of composite material of barium strontium aluminum containing silicate/mullite/SiC three-layer composite structural coating
  • Preparation method of composite material of barium strontium aluminum containing silicate/mullite/SiC three-layer composite structural coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Preparation of SiC coating by embedding method: first, 180g Si powder, 90g SiC powder, 15g carbon powder, 15gAl 2 o 3 Put it in a ball mill jar and wet grind it at a speed of 200r / min for 24 hours, take it out, put it in a drying oven at 90°C for 12 hours, and then sieve it with a 60-mesh sieve to obtain the embedding powder.

[0056] Put the embedding powder into a graphite jar and embed the C / C matrix sample in the embedding powder, heat it to 1750°C in an argon atmosphere in a vacuum sintering furnace, keep it warm for 2 hours, and then cool it slowly to room temperature Take out the sample. The sample was ultrasonically cleaned with absolute ethanol and dried at 90°C for 2 hours to obtain a SiC coating-coated C / C composite sample (matrix I).

[0057] 2. Preparation of mullite intermediate layer by sol-gel method: 1) 10.4165g tetraethyl orthosilicate and 56.247g Al(NO 3 ) 3 9H 2 Dissolve O in 50mL of ethanol, add 1.800g of glacial acetic acid, reflux in a wat...

Embodiment 2

[0060] 1. Preparation of SiC coating by embedding method: first, put 260g Si powder, 96g SiC powder, 40g carbon powder, and 4g Al2O3 in a ball mill jar and wet-grind at a speed of 200r / min for 8h, then take it out, and put it in a drying oven at 90°C Dry for 12 hours, and then sieve through a 60-mesh sieve to obtain the embedding powder.

[0061] Put the embedding powder into a graphite jar and embed the C / C matrix sample in the embedding powder, heat it to 1800°C in an argon atmosphere in a vacuum sintering furnace, keep it warm for 2 hours, and then cool it slowly to room temperature Take out the sample. The sample was ultrasonically cleaned with absolute ethanol and dried at 90°C for 2 hours to obtain a SiC coating-coated C / C composite sample (matrix I).

[0062] 2. Preparation of mullite intermediate layer by sol-gel method: 1) 41.666g orthosilicate and 225.078g Al(NO 3 ) 3 9H 2 Dissolve O in 200mL of ethanol, add 30g of glacial acetic acid, reflux in a water bath at 6...

Embodiment 3

[0065] 1. Preparation of SiC coating by embedding method: First, put 90g Si powder, 70g SiC powder, 30g carbon powder, and 10g Al2O3 in a ball mill tank at a speed of 220r / min for 4 hours, then take it out, and put it in a drying oven at 90°C Dry for 16 hours, and then sieve through a 60-mesh sieve to obtain the embedding powder.

[0066] Put the embedding powder into a graphite jar and embed the C / C matrix sample in the embedding powder, heat it to 1800°C in an argon atmosphere in a vacuum sintering furnace, keep it warm for 2 hours, and then cool it slowly to room temperature Take out the sample. The sample was ultrasonically cleaned with absolute ethanol and dried at 90°C for 2 hours to obtain a SiC coating-coated C / C composite sample (matrix I).

[0067] 2. Preparation of mullite interlayer by sol-gel method: 1) 52.0825g orthosilicate and 281.3475g Al(NO 3 ) 3 9H 2 Dissolve O in 400mL of ethanol, add 45g of glacial acetic acid, reflux for 5 hours under heating in a wat...

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Abstract

The invention relates to a preparation method of a composite material of a barium strontium aluminum containing silicate / mullite / SiC three-layer composite structural coating and belongs to the technical field of preparation of high-temperature-resistant composite materials. According to the basic technical route, the preparation method comprises the steps that a SiC bottom layer is prepared by adopting an embedding method, then a mullite middle layer is prepared on the surface of a SiC coated carbon / carbon composite material by using a sol-gel process, and finally a BSAS outer coating is prepared on the surface of the mullite middle layer by adopting an in-situ reaction sintering process. Compared with a traditional plasma spraying method and a chemical vapor deposition method, the method has the advantages that the device cost is low, the process is simple, quick and efficient and has strong adaptability to basic shapes, and the obtained coating is uniform, compact and the like. The preparation method is simple and controllable in process and facilitates industrialized application.

Description

technical field [0001] The invention relates to a method for preparing a composite material of a barium-containing strontium aluminum silicate / mullite / SiC three-layer composite structure coating, belonging to the technical field of high-temperature-resistant composite material preparation. Background technique [0002] A high thrust-to-weight ratio is a remarkable sign of a high-performance aeroengine, and the most direct means to achieve a high thrust-to-weight ratio is to increase the temperature of the turbine inlet. Compared with traditional high-temperature alloy materials, C / C composite materials (C / C) have excellent high-temperature mechanical properties, thermal shock resistance, chemical stability, and dimensional stability. Ultra-high temperature composite materials with high mechanical properties. At present, the development potential of traditional superalloy materials has been basically exhausted. Using C / C composite material hot end parts to replace traditiona...

Claims

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Application Information

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IPC IPC(8): C04B41/89C04B35/52
CPCC04B35/52C04B41/52C04B41/89C04B2235/9684C04B2235/9692C04B41/4545C04B41/5057C04B41/4537C04B41/5024C04B41/4535
Inventor 肖鹏文中流李专
Owner CENT SOUTH UNIV
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