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Preparation method for preparing surface SiC coating of silicon carbide-based composite material

A composite material and silicon carbide-based technology, which is applied in the field of preparation of SiC coating on the surface of composite materials, can solve the problems of narrow process window, large amount of melt volatilization, and difficult coating, so as to improve high temperature stability and density , the effect of high bonding strength

Active Publication Date: 2016-09-21
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
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Problems solved by technology

However, it is very difficult to prepare the coating by this method, and the surface quality of the coating is difficult to control: when the content of the powder brushed on the surface of the substrate is high, the melt will be enriched during infiltration at high temperature, and the melt will agglomerate on the substrate due to the existence of surface tension. Balls are formed on the surface of the material, which is difficult to clean; when the powder content is low, due to the low steam pressure, the melt will start to volatilize a lot when it reaches the melting point, and it cannot play the role of reactive infiltration
Because the thickness of the coating is very thin and the amount of powder required is very small, the process window of this method is narrow, which limits the application of the improved method

Method used

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  • Preparation method for preparing surface SiC coating of silicon carbide-based composite material

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preparation example Construction

[0034] A method for preparing a SiC coating on the surface of a silicon carbide-based composite material, the steps of which are:

[0035] (a) grinding, washing and drying the silicon carbide-based composite material;

[0036] (b) Brushing the viscous slurry on the surface of the silicon carbide-based composite material obtained in step (a), brushing excessively, and drying;

[0037] The composition of described viscous slurry comprises silicone resin, silicon powder and dehydrated alcohol, the quality of dehydrated alcohol and the ratio relation of the mass sum of silicone resin and silicon powder is 0.2-5:1, with silicone resin and silicon The total mass of the powder is calculated as 100 parts, wherein the mass percentage of silicone resin is 2%-10%, and the mass percentage of silicon powder is 90%-98%;

[0038] (c) Brush the inert material on the inner surface of the graphite container, spread a layer of silicon powder on the bottom of the graphite container after the bru...

Embodiment 1

[0053] A kind of preparation method of SiC coating on the surface of C / SiC composite material, the steps are:

[0054] (a) Grinding, washing and drying the C / SiC composite material;

[0055] (b) Brushing the viscous slurry on the surface of the C / SiC composite material obtained in step (a), brushing excessively, and drying;

[0056] The composition of described viscous slurry comprises 5g silicone resin, 95g silicon powder and 100g dehydrated alcohol;

[0057] (c) brush boron nitride on the inner surface of the graphite container, after the brushing is completed, spread a layer of silicon powder with a thickness of 2mm at the bottom of the graphite container, then place the C / after drying that step (b) obtains on the silicon powder SiC composite material, and finally spread a layer of silicon powder with a thickness of 2mm on the surface of the C / SiC composite material, seal the graphite container, then put the graphite container into another graphite container, and then sea...

Embodiment 2

[0065] Grinding, washing and drying the C / C-SiC composite material. Take 2g of silicone resin, 98g of Si powder and 50g of absolute ethanol to adjust it into a viscous slurry, brush it on the surface of the composite material, and brush excessively. Lay a layer of Si powder at the bottom of the graphite container, the purity of Si powder is 99%, and the particle size is 400 mesh. Put in the C / C-SiC composite material coated with Si powder, cover with a layer of Si powder, and tighten the graphite cap. Then place the graphite container into another graphite container with a screw cap and screw the graphite cap tightly. Put the graphite container into a high-temperature furnace for heat treatment at 1380° C. for 60 minutes in a vacuum environment with a vacuum degree of 50-200 Pa; then cool to room temperature with the furnace to obtain a composite material coated with a single layer of Si. The above-mentioned Si-coated composite material was embedded in graphite powder, then ...

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Abstract

The present invention relates to a preparation method for preparing the surface SiC coating of a silicon carbide-based composite material and belongs to the technical field of oxidation protection. According to the method, silicon powders are embedded in the surface of the silicon carbide-based composite material. After the high-temperature vacuum infiltration process, the composite material is embedded in a melt. After that, the composite material embedded in the melt is placed in an excess carbon source, and is subjected to the high-temperature heat treatment again. After residues on the surface of the composite material are removed, the composite material with the SiC coating can be obtained. According to the technical scheme of the invention, the coating is prepared through the reactive infiltration process. Therefore, during the preparation of the coating, the density of the base material can be further improved at the same time. the excess melt is removed by the carbon source, so that the formed SiC coating is uniform and smooth.

Description

technical field [0001] The invention relates to a method for preparing a SiC coating on the surface of a composite material, belonging to the technical field of oxidation protection. Background technique [0002] SiC-based composite materials are usually used in high-temperature oxidizing environments, and SiC coatings are generally prepared on the surface of composite materials to improve the oxidation resistance of materials. Reactive infiltration is usually used as a method for densification of SiC-based composites, and it also has a positive effect on the oxidation resistance of the material. At high temperature, melts such as Si or Si-Zr alloys penetrate into the pores of the composite material through capillary force to increase the density of the composite material. Compounds such as SiC and ZrC formed by the reaction of the melt and carbon elements in the composite material have certain anti-oxidation functions. [0003] In the prior art, methods for preparing SiC c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/5059C04B41/87C04B35/565C04B41/4558C04B41/4545C04B41/4523
Inventor 龚晓冬李军平张国兵孙新常京华冯志海
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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