SiC-ZrB2 gradient surface coating of Sic-based composite material and preparation method thereof

A sic-zrb2, composite material technology is applied in the field of oxidation protection of ceramic matrix composite materials to achieve the effects of wide cracking process window, simple process and improved ablation resistance

Active Publication Date: 2016-08-31
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Each layer has the same thickness

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  • SiC-ZrB2 gradient surface coating of Sic-based composite material and preparation method thereof
  • SiC-ZrB2 gradient surface coating of Sic-based composite material and preparation method thereof
  • SiC-ZrB2 gradient surface coating of Sic-based composite material and preparation method thereof

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preparation example Construction

[0041] A kind of SiC-based composite material surface SiC-ZrB 2 The preparation method of gradient coating, the steps are:

[0042] (a) Put the raw materials of each layer in different ceramic ball milling tanks and mill them for 10 to 120 minutes;

[0043] (b) Add the ceramic precursor and the solvent to the ceramic ball mill tank of step (a) for ball milling, the ball milling time is 3 to 120 minutes, and the slurry is obtained in the ceramic ball mill tank after the ball milling is completed;

[0044] Taking the total mass of the raw materials, ceramic precursor and solvent of each layer as 100%, the mass fraction of ceramic precursor is 10%-35%, the mass fraction of solvent is 15%-50%, and the mass fraction of raw materials is 45% -60%;

[0045] (c) Grind, clean and dry the SiC-based composite material;

[0046] (d) Brush the slurry in step (b) on the surface of the composite material in sequence, and dry it after brushing;

[0047] (e) The SiC-based composite material with the slur...

Embodiment 1

[0060] Press SiC and ZrB 2 The molar ratio is 10:1; 4:1; 1:1; 0.4:1. Weigh the powder of the corresponding mass. Among them, the purity of SiC is 99%, the particle size is 500nm, and ZrB 2 The purity is 99%, the particle size is 200nm, placed in a ceramic ball milling tank, ball milled for 20 minutes, and the powder is taken out and classified, numbered A, B, C, D, and spare. The polycarbosilane and divinylbenzene (DVB) were formulated into a precursor solution at a mass ratio of 1:0.6. Take the 12wt% precursor solution, 38wt% THF and 50wt% of the above 4 kinds of powders in a ball mill tank and mix them, ball mill for 3 minutes, and take out the mixed slurry, numbered a , B, c, d. Grind, wash and dry the C / SiC composite material. Brush a, b, c, d slurries on the surface of the composite material in turn, and dry after brushing. Put the brushed coating on N 2 Medium curing, curing temperature is 220 ℃, time is 2h. Place the cured coating in Ar for heat treatment at a temper...

Embodiment 2

[0066] Press SiC and ZrB 2 The molar ratio is 10:1; 4:1; 1:1; 0.4:1. Weigh the powder of the corresponding mass. Among them, the purity of SiC is 99%, the particle size is 500nm, and ZrB 2 The purity is 99%, the particle size is 200nm, placed in a ceramic ball milling tank, ball milled for 20 minutes, and the powder is taken out and classified, numbered A, B, C, D, and spare. Take 20wt% of polysilazane, 36wt% of THF and 44wt% of the above 4 kinds of powders in a ball mill tank and mix them, ball mill for 3 minutes, and take out the mixed slurry, numbered a, b, c, d. Grind, wash and dry the C / SiC composite material. Brush the a and b slurries on the surface of the composite material in turn, and dry after brushing. Then put it in N 2 Medium curing, curing temperature is 220 ℃, time is 2h. Brush the slurries c and d on the surface of the cured coating successively, air dry, and cure at 220°C for 2 hours. The cured coating is placed in Ar for heat treatment, the heat treatment...

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Abstract

The invention relates to a SiC-ZrB2 gradient surface coating of a SiC-based composite material and a preparation method thereof, and belongs to the field of ceramic based composite material oxidation protection technology. The method comprises mixing nanometer SiC powder and nanometer ZrB2 powder by different mole ratios, then respectively mixing them with ceramic precursor, solvent and the like to prepare slurries containing different powder proportions, coating the slurries onto the surface of the composite material in sequence from the smaller SiC mole ratio to the greater SiC mole ratio, thereby forming a gradient coating after curing and dissociation. The coating has good physical and chemical compatibilities with the substrate material, without obvious boundary between layers. The self-coalescence ability and the erosion resistance of the coating increase gradually from inside to outside; and the coating is characterized in wide temperature range oxidation resistance. The SiC-ZrB2 gradient surface coating of the SiC-based composite material and the preparation method thereof are simple in process, easy to scale up, suitable for industrial production, with high efficiency and wide process window, and with preparation cost being greatly reduced.

Description

Technical field [0001] The invention relates to a SiC-ZrB surface SiC-based composite material 2 A gradient coating and a preparation method thereof belong to the technical field of ceramic-based composite material oxidation protection. Background technique [0002] SiC-based composite materials have the advantages of low density, wear resistance, thermal shock resistance, and excellent high temperature mechanical properties, and are often used as high temperature resistant structural materials. Such materials are often used in high-temperature oxidation and erosion environments, and the carbon fibers inside the SiC-based composite material are easily oxidized, resulting in a decrease in the mechanical properties of the material. The preparation of anti-oxidation coating on the surface of composite materials is one of the effective anti-oxidation protection methods. [0003] There are many anti-oxidation coating systems on the surface of SiC-based composites. The most common coati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/507C04B41/87C04B41/5059C04B41/4983C04B41/52C04B41/495C04B35/565C04B35/806C04B35/52
Inventor 冯志海龚晓冬赵彦伟李军平张国兵路明辉刘宏瑞
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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