Method for preparing ablation-resistant coating

An anti-ablation and coating technology is applied in the field of preparation of anti-ablation coatings, which can solve the problems of high cost, ablation of C/C composite materials, and poor coating quality, and achieves improved fluidity and high temperature resistance. The effect of ablative properties

Inactive Publication Date: 2017-08-08
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zirconium diboride-silicide-based ceramic coatings have good anti-static ablation performance, but in the actual application process, the high-speed flame flow in the environment and the relative motion generated by the high-speed motion of the material itself will lead to the formation of Under the action of high temperature and high speed, silica glass consumes silica glass in a short time, so that the por

Method used

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  • Method for preparing ablation-resistant coating
  • Method for preparing ablation-resistant coating

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Ingredients ball milling: Mix zirconium diboride, molybdenum disilicide and yttrium oxide with a particle size of 1~3μm in a mass ratio of 65:30:5, and then mix the mixed powder and adhesive in a mass ratio of 95:5 Mix, add deionized water with 1.5 times the mass of the mixture, and ball mill for 24 hours to form a slurry;

[0027] (2) Spray drying: The slurry in step (1) is atomized and dried in a spray drying tower, the outlet temperature of the drying tower is about 110°C, and the slurry is stirred with a mixer to make a spherical powder;

[0028] (3) Sintering: put the spherical powder in step (2) in a vacuum resistance furnace, sinter at 1200°C, keep it warm for 1 hour, and cool down with the furnace after sintering;

[0029] (4) Screening: pass the spherical powder sintered in step (3) through a 325-mesh sieve to obtain zirconium diboride-molybdenum disilicide-yttrium oxide powder for spraying, whose appearance is as follows figure 1 As shown in the scanning ...

Embodiment 2

[0035] (1) Ingredients ball milling: Mix zirconium diboride, silicon silicide and yttrium oxide with a particle size of 1~3μm at a mass ratio of 55:35:10, and then mix the mixed powder and adhesive at a mass ratio of 96:4 , add deionized water 1.5 times the mass of the mixture, and ball mill for 32 hours to form a slurry;

[0036] (2) Spray drying: The slurry in step (1) is atomized and dried in the spray drying tower, the outlet temperature of the drying tower is about 130°C, and the slurry is stirred with a mixer to make spherical powder;

[0037] (3) Sintering: put the spherical powder in step (2) in a vacuum resistance furnace, sinter at 1600°C, keep it warm for 2 hours, and cool down with the furnace after sintering;

[0038] (4) Sieving: pass the spherical powder sintered in step (3) through a 325 mesh sieve to obtain zirconium diboride-silicon carbide-yttrium oxide powder for spraying;

[0039] (5) Coating preparation: Plasma spraying equipment is used, the spraying pr...

Embodiment 3

[0042] (1) Ingredients ball milling: Mix zirconium diboride, molybdenum disilicide and yttrium oxide with a particle size of 1~3μm at a mass ratio of 56:36:8, and then mix the mixed powder and adhesive at a mass ratio of 95:5 Mix, add deionized water with 1.5 times the mass of the mixture, and ball mill for 24 hours to form a slurry;

[0043] (2) Spray drying: The slurry in step (1) is atomized and dried in a spray drying tower, the outlet temperature of the drying tower is about 110°C, and the slurry is stirred with a mixer to make a spherical powder;

[0044] (3) Sintering: put the spherical powder in step (2) in a vacuum resistance furnace, sinter at 1200°C, keep it warm for 1 hour, and cool down with the furnace after sintering;

[0045] (4) Sieving: passing the sintered spherical powder in step (3) through a 325-mesh sieve to obtain zirconium diboride-molybdenum disilicide-yttrium oxide powder for spraying;

[0046] (5) Coating preparation: Plasma spraying equipment is u...

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Abstract

The invention relates to a method for preparing an ablation-resistant coating. The method comprises the following steps: mixing zirconium diboride and molybdenum disilicide or silicon carbide and yttrium oxide with the particle size of 1 to 3 microns, then, mixing the mixture with a binder so as to obtain a mixture, blending the mixture with deionized water, and then, carrying out ball milling, so as to obtain slurry; preparing spherical powder at the temperature of 110 DEG C to 130 DEG C; carrying out sintering for 1 to 2 hours at the temperature of 1,200 DEG C to 1,600 DEG C; carrying out sieving, so as to obtain zirconium diboride-molybdenum disilicide or silicon carbide-yttrium oxide powder for spraying; spraying a zirconium diboride-molybdenum disilicide or silicon carbide undercoat to the surface of a carbon/carbon composite material by a plasma spraying method, and then, spraying the zirconium diboride-molybdenum disilicide or silicon carbide-yttrium oxide powder to the undercoat by the same method, thereby preparing the ablation-resistant coating. The yttrium oxide modified zirconium diboride-molybdenum disilicide or silicon carbide coating prepared by the method can be used for remarkably improving the high-temperature ablation resistance of the carbon/carbon composite material.

Description

technical field [0001] The invention relates to a preparation method of an ablation-resistant coating, which belongs to the technical field of thermal spraying, in particular to a preparation method of improving a zirconium diboride-based ablation-resistant coating through rare earth oxide modification. Background technique [0002] Carbon-based composites have excellent high-temperature mechanical properties, such as high strength, high specific modulus, good fracture toughness and wear resistance, and are ideal high-temperature resistant structural materials. However, carbon-based composites are prone to oxidation in high-temperature oxidizing environments, such as: carbon in air above 370°C; in water vapor above 650°C; in CO above 750°C 2 Severe oxidation will occur in all of them, resulting in a sharp decline in their mechanical properties. Therefore, preventing the oxidation and ablation of carbon-based composites at high temperatures is an urgent problem to be solved ...

Claims

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Application Information

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IPC IPC(8): C04B41/89C04B35/83
CPCC04B35/83C04B41/009C04B41/52C04B41/89C04B41/5062C04B41/5053C04B41/4533C04B41/5045
Inventor 邓春明刘敏韩伟毛杰张小锋杨焜邓畅光周克崧陈志坤
Owner GUANGDONG INST OF NEW MATERIALS
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