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Mullite anti-oxidation coating for composite material and preparation method of mullite anti-oxidation coating

A composite material and mullite technology, which is applied in the field of mullite anti-oxidation coating for composite materials and its preparation, can solve problems such as thermal expansion coefficient mismatch, complex process, coating cracks, etc., and achieve good high temperature stability and high temperature stability. Oxidation resistance, coating surface smoothing, reduction in oxidative weight gain

Active 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

At present, the commonly used anti-oxidation coating materials mainly include phosphate, silicate and pentasilicate coating materials. However, due to the mismatch of thermal expansion coefficients and other reasons, the coating generates internal stress during the heating and cooling process, resulting in the formation of coatings. Cracks and causes cracking, limiting the actual protective ability of the coating
[0004] At present, the method of preparing anti-oxidation coatings for composite materials is mainly the embedding method, including one-time embedding and multiple embedding methods, but the coating preparation method is complicated, the cycle is long, and the surface of the prepared coating is rough and uneven.

Method used

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  • Mullite anti-oxidation coating for composite material and preparation method of mullite anti-oxidation coating
  • Mullite anti-oxidation coating for composite material and preparation method of mullite anti-oxidation coating
  • Mullite anti-oxidation coating for composite material and preparation method of mullite 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, to the Al(OH) of Step 2 3 A certain amount of transparent silica sol is added to the transparent sol, the concentration of the silica sol is 30wt%, and the volume of the silica sol is 500 mL;

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

[0041] Step 5, place the composite material substrate and the mixed sol in step 4 on a liquid-phase plasma spraying equipment, and use the suspension plasma spraying equip...

Embodiment example 2

[0044] Step 1, prepare the Al(NO) of the set concentration 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 was placed in a hot water pot, stirred continuously and an appropriate amount of ammonia water was added dropwise to form 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, to the Al(OH) of Step 2 3 A certain amount of transparent silica sol is added to the transparent sol, the concentration of the silica sol is 40wt%, and the volume of the silica sol is 1000 mL;

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

[0048] Step 5, place the composite material substrate and the mixed sol in step 4 on a liquid-phase plasma spraying equipment, and use the su...

Embodiment example 3

[0051] Step 1, prepare the Al(NO) of the set concentration 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 was placed in a hot water pot, stirred continuously and an appropriate amount of ammonia water was added dropwise to form 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, to the Al(OH) of Step 2 3 A certain amount of transparent silica sol is added to the transparent sol, the concentration of the silica sol is 35wt%, and the volume of the silica sol is 800 mL;

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

[0055] Step 5, place the composite material substrate and the mixed sol in step 4 on a liquid-phase plasma spraying equipment, and use the susp...

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Abstract

The invention relates to a mullite anti-oxidation coating for a composite material and a preparation method of the mullite anti-oxidation coating. The preparation method comprises the following steps of: preparing an Al (NO3) 3.9 H2O solution; putting the Al (NO3) 3.9 H2O solution into a hydrothermal pot, continuously stirring, and dropwise adding a proper amount of ammonia water to generate Al (OH) 3 transparent sol; adding transparent silica sol into the Al (OH) 3 transparent sol; placing the mixed sol in the previous step on a roller ball mill for ball milling; placing a pretreated C / C composite material substrate and the mixed sol on liquid-phase plasma spraying equipment, and spraying Al (OH) 3 and SiO2 coatings on the substrate 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 better high-temperature stability, so that the oxidation resistance of the composite material is improved, and the service life of the composite material is prolonged.

Description

technical field [0001] The invention belongs to the technical field of surface modification of composite materials, in particular to a kind of mullite (3Al 2 o 3 2SiO2 2 ) anti-oxidation coating and preparation method thereof. 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 have a fatal shortcoming, that is, poor high-temperature oxidation resistance, and the oxidation rate above 450°C is more obvious, and the oxidation phenomenon continues to intensify as the temperature increases. [0003] Preparation of anti-oxidation coating on the surface of composite materials is an effective method to solve the problem of easy oxidation of C / C composite materials. At present, the commonly used anti-oxidation coating materials mainly include phosphate, silicate and pentasilicate coating materials. However, due to the mismatch of thermal expansion coeffic...

Claims

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Application Information

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