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A kind of SIC-Zrb2 gradient coating on the surface of SIC-based composite material and preparation method thereof

A composite material and gradient coating technology, which is applied in the field of oxidation protection of ceramic matrix composite materials, achieves the effects of low cost, simple process, and wide cracking process window

Active Publication Date: 2019-02-19
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Each layer has the same thickness

Method used

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  • A kind of SIC-Zrb2 gradient coating on the surface of SIC-based composite material and preparation method thereof
  • A kind of SIC-Zrb2 gradient coating on the surface of SIC-based composite material and preparation method thereof
  • A kind of SIC-Zrb2 gradient coating on the surface of SIC-based composite material and preparation method thereof

Examples

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preparation example Construction

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

[0042] (a) Place the raw materials of each layer in different ceramic ball mill jars, and mill them for 10-120 minutes;

[0043] (b) respectively adding a ceramic precursor and a solvent into the ceramic ball milling pot in step (a) for ball milling, the ball milling time is 3 to 120 min, and after the ball milling is completed, the slurry is obtained in the ceramic ball milling pot;

[0044] The mass fraction of the ceramic precursor is 10%-35%, the mass fraction of the solvent is 15%-50%, and the mass fraction of the raw material is 45%. -60%;

[0045] (c) polishing, cleaning and drying the SiC-based composite material;

[0046] (d) the slurry in the step (b) is brushed on the surface of the composite material in sequence, and dried after brushing;

[0047] (e) placing the SiC-based composite material coated with the slurry on the surface obtaine...

Embodiment 1

[0060] By SiC and ZrB 2 The molar ratio is 10:1; 4:1; 1:1; 0.4:1, respectively weigh the corresponding powder. Among them, the purity of SiC is 99%, the particle size is 500nm, ZrB 2 The purity is 99%, the particle size is 200nm, placed in a ceramic ball mill jar, milled for 20 minutes, the powder is taken out and classified, numbered A, B, C, D, and set aside. Polycarbosilane and divinylbenzene (DVB) were formulated as a precursor solution at a mass ratio of 1:0.6. Take 12wt% precursor solution, 38wt% THF and 50wt% powders of the above 4 kinds of proportions and mix them in a ball mill jar respectively, mill for 3 minutes, and take out the mixed slurry, numbered as a , b, c, d. Grinding, cleaning and drying the C / SiC composite material. Brush the slurry of a, b, c, and d on the surface of the composite material in turn, and let it dry after brushing. Place brushed coating on N 2 Medium curing, the curing temperature is 220°C, and the curing time is 2h. The cured coatin...

Embodiment 2

[0066] By SiC and ZrB 2 The molar ratio is 10:1; 4:1; 1:1; 0.4:1, respectively weigh the corresponding powder. Among them, the purity of SiC is 99%, the particle size is 500nm, ZrB 2 The purity is 99%, the particle size is 200nm, placed in a ceramic ball mill jar, milled for 20 minutes, the powder is taken out and classified, numbered A, B, C, D, and set aside. Take 20wt% of polysilazane, 36wt% of THF and 44wt% of the powders of the above 4 kinds of proportions and mix them in a ball mill jar respectively, mill for 3 minutes, take out the mixed slurry, and the number is a, b, c, d. Grinding, cleaning and drying the C / SiC composite material. Brush slurry a and b in sequence on the surface of the composite material, and let it dry after brushing. then place it in N 2 Medium curing, the curing temperature is 220°C, and the curing time is 2h. Brush the slurry c and d on the surface of the cured coating in sequence, dry it, and cure it at 220°C for 2 hours. The cured coating...

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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 of a SiC-based composite material 2 A gradient coating and a preparation method thereof belong to the technical field of oxidation protection of ceramic matrix composite materials. 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 served in high-temperature oxidation and erosion environments, and the carbon fibers inside the SiC-based composite materials 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 composite ma...

Claims

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Application Information

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Patent Type & Authority Patents(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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