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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

AI Technical Summary

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 pores, cracks and other defects in the coating are not filled with glass, and the oxidizing medium enters the coating and even the interior of the substrate, reducing the Anti-ablation effect of the coating, leading to ablation of the C / C composite
However, this method requires the use of high-cost rare earth borides, and the powder obtained by mechanical methods has poor flow properties and poor coating quality

Method used

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  • Method for preparing ablation-resistant coating

Examples

Experimental program
Comparison scheme
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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