Method for preparing superhigh temperature resistant ceramic coat

A technology for ultra-high temperature ceramics and coatings, applied in the field of preparation of ultra-high temperature resistant ceramic coatings, can solve the problems of poor substrate bonding performance, complex process equipment, low coating density, etc., to achieve dense coatings and low preparation temperatures , preparation process and equipment require simple effect

Inactive Publication Date: 2008-11-19
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
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Problems solved by technology

[0004] At present, the plasma spraying technology is mostly used in the preparation of ultra-high temperature resistant ceramic coatings, but the process equipment for this technology is complicated and the cost is high
In addition, there are also methods that directly use ultra-high temperature-resistant ceramic powder mixed with adhesive to form slurry, and then prepare ultra-high-temperature-resistant ceramic coatings by brushing and high-temperature pyrolysis. The coating prepared by this method has low density and poor bonding performance with the substrate.

Method used

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  • Method for preparing superhigh temperature resistant ceramic coat
  • Method for preparing superhigh temperature resistant ceramic coat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An ultra-high temperature resistant ceramic coating is prepared by the following steps:

[0021] Step 1: Set the density to 1.70g / cm 3 The surface of the dense three-dimensional C / C composite material was polished and smoothed, using acetone as the medium, ultrasonic cleaning for 30 minutes, and drying in an oven at 80 °C for 3 hours;

[0022] Step 2: Mix Zr powder, B powder, C powder and Si powder in a molar ratio of 1:2:0.15:0.2 to obtain mixed powder, add adhesive phenolic resin and diluent acetone, and mix the volume of powder, adhesive and diluent The ratio is 1:1:1, and the slurry for coating is formed after ball milling for 8 hours;

[0023] Step 3: evenly brush the above-mentioned coating slurry on the surface of the C / C composite material after drying, and the number of coating layers is 5;

[0024] Step 4: Place the pre-coated composite material in an oven to slowly heat up to 200°C, with a heating rate of 1°C / min, and cool down naturally after being kept fo...

Embodiment 2

[0028] Step 1: Set the density to 1.88g / cm 3 The surface of the dense 3D C / SiC composite was polished and smoothed, using acetone as the medium, ultrasonic cleaning for 60 minutes, and drying in an oven at 80 °C for 2 hours;

[0029] Step 2: Mix Zr powder and B powder in a molar ratio of 1:2 to obtain a mixed powder, add adhesive polycarbosilane / divinylbenzene mixed solution (volume ratio of 1:1) and diluent xylene, and the mixing The volume ratio of powder, adhesive and diluent is 1:1.5:0.5, and the slurry for coating is formed after ball milling for 24 hours;

[0030] Step 3: evenly brush the coating slurry on the surface of the C / SiC composite material, and the number of brushing layers is 4;

[0031] Step 4: Place the pre-coated composite material in an oven to slowly heat up to 180°C, with a heating rate of 1°C / min, and cool down naturally after being kept for 2 hours;

[0032] Step 5: Put the cured composite material of the precoat in a high-temperature sintering furna...

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Abstract

The invention discloses a method for making a super-high temperature resistant ceramic coating. The method adopts organic polymer as adhesive and mixed powder consisting of high melting metal powder, B powder, C powder and Si powder as raw materials; moreover, through adopting processes such as preparing slurry used in a coating, slurry coating, precoating curing, high-temperature reaction sintering, a super-high temperature resistant ceramic coating is finally made on the surface of a ceramic matrix composite material. The coating making process is simple and has low cost; the made coating has ideal bonding performance with a substrate and has excellent ablation resistance and antioxidation, thereby laying the foundation for the application of a ceramic matrix composite material in the super-high temperature resistant and antioxidation fields.

Description

technical field [0001] The invention relates to a ceramic coating process, in particular to a preparation method of an ultra-high temperature resistant ceramic coating. Background technique [0002] With the increase of the flying speed of the aircraft and the requirements for the high reliability and reusability of the aircraft, the requirements for the material properties are also getting higher and higher. For example, when an aerospace vehicle re-enters the atmosphere, the speed is as high as Mach 30, forming a strong shock wave, the air is strongly compressed, and the pressure and temperature rise sharply. 3000℃) and severe thermal environment with large heat flow (tens of megawatts to hundreds of megawatts). Another example is the hot end components of solid rocket motors (such as throat linings), which need to withstand complex thermal stress environments, high temperatures of 2000-3000 °C, and Al. 2 O 3 High-speed scouring of ceramic particles, etc. Therefore, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/88
Inventor 胡海峰张玉娣张长瑞赵丹王其坤杨国威
Owner NAT UNIV OF DEFENSE TECH
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