Preparation method of SiC coated mullite complex coating of C/C composite material

A composite coating and composite material technology, which is applied in the field of preparation of C/C composite composite coatings, can solve the problems of extreme preparation conditions, expensive equipment and harsh preparation processes, etc., and achieves high oxidation resistance, uniform thickness, Good physicochemical compatibility

Inactive Publication Date: 2010-11-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods either have high requirements on equipment, and the equipment and instruments are relatively expensive; or the preparation process is relative

Method used

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  • Preparation method of SiC coated mullite complex coating of C/C composite material
  • Preparation method of SiC coated mullite complex coating of C/C composite material
  • Preparation method of SiC coated mullite complex coating of C/C composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Embodiment 1: 1) get 5ml SiO 2 The content is greater than or equal to 28% tetraethyl orthosilicate, 20ml of absolute ethanol and 10ml of distilled water are mixed evenly, and then the pH value of the solution is adjusted to 4 with hydrochloric acid, and magnetically stirred for 1 hour at room temperature to prehydrolyze the tetraethyl orthosilicate to obtain ethyl orthosilicate Ester solution; 2) get 25.12g of analytically pure Al(NO 3 ) 3 9H 2 Al(NO 3 ) 3 aqueous solution; 3) the Al(NO) prepared in step 2) 3 ) 3The aqueous solution is mixed with the tetraethyl orthosilicate solution prepared in step 1), and then magnetically stirred at room temperature for 2-4 hours to obtain a sol. During this process, the pH value of the sol is adjusted to 4.5 with ammonia water at pH=10.7; 4) Take 5 g of the average particle size of 40nm The nano-SiC powder is dispersed in the sol and ultrasonically dispersed by an ultrasonic generator with a power of 100-300W so that the nan...

Embodiment 2

[0016] Embodiment 2: 1) get 5ml SiO 2 The content is greater than or equal to 28% ethyl orthosilicate, 20ml of absolute ethanol and 10ml of distilled water are mixed evenly, and then the pH value of the solution is adjusted to 3 with hydrochloric acid, and magnetically stirred for 40 minutes at room temperature to pre-hydrolyze ethyl orthosilicate to obtain ethyl orthosilicate Ester solution; 2) get 25.12g of analytically pure Al(NO 3 ) 3 9H 2 Al(NO 3 ) 3 aqueous solution; 3) the Al(NO) prepared in step 2) 3 ) 3 The aqueous solution is mixed with the tetraethyl orthosilicate solution prepared in step 1), and then magnetically stirred at room temperature for 2-4 hours to obtain a sol. During this process, the pH value of the sol is adjusted to 5 with ammonia water at pH=10.7; 4) Take 6 g of the average particle size of 40nm The nano-SiC powder is dispersed in the sol and ultrasonically dispersed by an ultrasonic generator with a power of 100-300W so that the nano-SiC powd...

Embodiment 3

[0017] Embodiment 3: 1) get 5ml SiO 2 The content is greater than or equal to 28% tetraethyl orthosilicate, 20ml of absolute ethanol and 10ml of distilled water are mixed evenly, and then the pH value of the solution is adjusted to 2 with hydrochloric acid, and magnetically stirred for 1 hour at room temperature to prehydrolyze the tetraethyl orthosilicate to obtain ethyl orthosilicate Ester solution; 2) get 25.12g of analytically pure Al(NO 3 ) 3 9H 2 O was dissolved in 20ml of distilled water and stirred magnetically for 30min at room temperature 3 ) 3 aqueous solution; 3) the Al(NO) prepared in step 2) 3 ) 3 Mix the aqueous solution with the tetraethyl orthosilicate solution prepared in step 1) and then magnetically stir at room temperature for 2-4 hours to obtain a sol. During this process, adjust the pH value of the sol to 4.5 with ammonia water at pH=10.7; 4) take 7 g of the average particle size of 40nm The nano-SiC powder is dispersed in the sol, and an ultrasoni...

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Abstract

The invention discloses a preparation method of a SiC coated mullite complex coating of a C/C composite material, which comprises the following steps: evenly mixing tetraethoxysilane, absolute ethyl alcohol and distilled water to obtain a tetraethoxysilane solution; mixing Al(NO3)3 aqueous solution with the tetraethoxysilane solution to obtain sol; dispersing nano SiC powder into the sol to obtain a suspension sol; aging and drying the suspension sol into dried gel, grinding the dried gel in an agate mortar, and then putting the ground dried gel into a crucible and sintering to obtain SiC coated mullite powder; dissolving the coated mullite powder into isopropanol to prepare into suspension and then adding iodine simple substance, clipping C/C composite material samples with a SiC inner coating on the cathode clip in a hydrothermal kettle; putting the hydrothermal kettle in an oven for hydrothermal electrophoresis reaction and then naturally cooling to room temperature; and taking out the samples and drying to obtain the SiC coated mullite complex coating of the C/C composite material. The prepared SiC coated mullite complex coating of the C/C composite material has excellent bond, even thickness, compact surface and excellent physical and chemical compatibility.

Description

technical field [0001] The invention relates to a method for preparing a C / C composite material composite coating, in particular to a C / C composite material SiC-coated mullite composite coating with uniform and dense surface, uniform thickness and no penetrating cracks and pinholes. layer preparation method. Background technique [0002] Carbon / carbon composite material (C / C) is a carbon-based composite material with carbon fiber as the reinforcing phase. It has light specific gravity, high strength and high modulus, high thermal stability, high thermal conductivity, low density, low thermal expansion coefficient, and ablation resistance. , corrosion resistance, stable friction coefficient and other characteristics, especially the characteristics that the mechanical properties do not decrease but rise with the increase of temperature, it is an ideal high temperature material for aerospace and other industrial fields. However, many of its above-mentioned properties can only ...

Claims

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Application Information

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IPC IPC(8): C04B41/85
Inventor 黄剑锋杨强王文静曹丽云吴建鹏曾燮榕李贺军
Owner SHAANXI UNIV OF SCI & TECH
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