Mullite high-temperature anti-oxidation coating on surface of composite material and preparation method of mullite high-temperature anti-oxidation coating

A composite material and mullite technology, which is applied in the field of mullite high-temperature anti-oxidation coating on the surface of composite materials and its preparation, can solve the problems of poor thermal shock resistance and high temperature erosion resistance, shedding, long cycle, etc., to achieve Good high temperature stability and oxidation resistance, improved oxidation resistance, and reduced oxidation weight gain

Inactive Publication Date: 2022-01-14
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Glass coating is the most commonly used anti-oxidation coating for C / C composite materials, mainly including phosphate, silicate and borosilicate glass, but due to the thermal expansion coefficient mismatch between glass and composite material substrate, it will cause the coating A certain amount of thermal stress is generated during the process, resulting in cracking or falling off of the coating, poor thermal shock resistance, poor thermal shock resistance and high temperature erosion resistance, and no high temperature protection.
[0004] At present, the commonly used method for preparing glass anti-oxidation coatings is the embedding method. However, the coating preparation method is complex, the cycle is long, and the surface of the prepared coating is rough and uneven, which requires subsequent processing.
In addition, the embedding method is not suitable for complex and large components, and it is difficult to ensure the stability of the process, the uniformity and integrity of the coating

Method used

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  • Mullite high-temperature anti-oxidation coating on surface of composite material and preparation method of mullite high-temperature anti-oxidation coating
  • Mullite high-temperature anti-oxidation coating on surface of composite material and preparation method of mullite high-temperature anti-oxidation coating
  • Mullite high-temperature anti-oxidation coating on surface of composite material and preparation method of mullite high-temperature anti-oxidation coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0037] Step 1, prepare Al(NO 3 ) 3 9H 2 O solution, the volume is 2000mL, Al(NO 3 ) 3 9H 2 The mass fraction of O is 20wt.%;

[0038] Step 2, Al(NO 3 ) 3 9H 2 The O solution is placed in a hot water pot, continuously stirred and an appropriate amount of ammonia water is added drop by drop to generate Al(OH) 3 Transparent sol, wherein the temperature of the water bath is 60°C, and the concentration of ammonia water is 5%;

[0039]Step 3, Al(OH) to step 2 3 Add a certain amount of transparent silica sol to the transparent sol, the concentration of the silica sol is 30wt%, and the volume of the silica sol is 500mL;

[0040] Step 4, placing the mixed sol in step 3 on a roller ball mill for ball milling, the speed of the roller ball mill is 60r / min, and the working time is 4h;

[0041] Step 5, place the C / C composite material substrate and the mixed sol in step 4 on the liquid plasma spraying equipment, and prepare Al(OH) on the composite material plate by using the susp...

Embodiment example 2

[0044] Step 1, prepare Al(NO 3 ) 3 9H 2 O solution, the volume is 2000mL, Al(NO 3 ) 3 9H 2 The mass fraction of O is 40wt.%;

[0045] Step 2, Al(NO 3 ) 3 9H 2 The O solution is placed in a hot water pot, continuously stirred and an appropriate amount of ammonia water is added drop by drop to generate Al(OH) 3 Transparent sol, wherein the temperature of the water bath is 80°C, and the concentration of ammonia water is 10%;

[0046] Step 3, Al(OH) to Step 2 3 Add a certain amount of transparent silica sol to the transparent sol, the concentration of the silica sol is 40wt%, and the volume of the silica sol is 1000mL;

[0047] Step 4, placing the mixed sol in step 3 on a roller ball mill for ball milling, the speed of the roller ball mill is 80r / min, and the working time is 8h;

[0048] Step 5, place the C / C composite material substrate and the mixed sol in step 4 on the liquid plasma spraying equipment, and prepare Al(OH) on the composite material plate by using the s...

Embodiment example 3

[0051] Step 1, prepare Al(NO 3 ) 3 9H 2 O solution, the volume is 2000mL, Al(NO 3 ) 3 9H 2 The mass fraction of O is 30wt.%;

[0052] Step 2, Al(NO 3 ) 3 9H 2 The O solution is placed in a hot water pot, continuously stirred and an appropriate amount of ammonia water is added drop by drop to generate Al(OH) 3 Transparent sol, wherein the temperature of the water bath is 70°C, and the concentration of ammonia water is 8%;

[0053] Step 3, Al(OH) to Step 2 3 Add a certain amount of transparent silica sol to the transparent sol, the concentration of the silica sol is 35wt%, and the volume of the silica sol is 800mL;

[0054] Step 4, placing the mixed sol in step 3 on a roller ball mill for ball milling, the speed of the roller ball mill is 70r / min, and the working time is 6h;

[0055] Step 5, place the C / C composite material substrate and the mixed sol in step 4 on the liquid plasma spraying equipment, and prepare Al(OH) on the composite material plate by using the sus...

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PUM

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Abstract

The invention discloses a mullite high-temperature anti-oxidation coating on the surface of a composite material and a preparation method of the mullite high-temperature anti-oxidation coating. The preparation method comprises the following steps of: preparing an Al (NO3) 3.9 H2O solution with a set concentration; dropwise adding excessive ammonia water into the solution obtained in the previous step, and continuously stirring until white precipitate is generated; adding transparent silica sol into the white precipitate; placing the mixed suspension in the previous step on a roller type ball mill for ball milling; placing a C / C composite material plate and the mixed suspension on liquid-phase plasma spraying equipment, and preparing Al (OH) 3 and SiO2 coatings on the composite material plate by using suspension plasma spraying equipment; and carrying out vacuum heat treatment on the prepared coatings at high temperature to make the coatings react to generate a mullite coating. According to the invention, Al2O3 and SiO2 are compounded to generate a mullite phase with good high-temperature stability, so that the oxidation resistance of the composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of composite material surface modification, and in particular relates to a composite material surface mullite (3Al 2 o 3 2SiO2 2 ) high temperature anti-oxidation coating and its preparation method. Background technique [0002] C / C composites are widely used in aerospace and industrial fields due to their excellent mechanical and thermal properties. However, C / C composites are easily oxidized at high temperatures, and the oxidation rate increases significantly when the temperature exceeds 450 °C. Therefore, in order to ensure the high-temperature performance of C / C composites, effective anti-oxidation measures must be taken. [0003] It is an effective method to improve the oxidation resistance of C / C composites by preparing anti-oxidation coating on the surface of composite materials. Glass coating is the most commonly used anti-oxidation coating for C / C composite materials, mainly including phosphate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/87C04B41/009C04B41/5027C04B35/83C04B41/4527C04B41/4558
Inventor 王弘喆崔雄华张磊曹海涛杨哲一崔锦文
Owner XIAN THERMAL POWER RES INST CO LTD
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