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a kind of sic f /sic composite material surface anti-radiation anti-air oxidation composite coating and preparation method thereof

A composite coating and composite material technology, applied in the field of functional coatings, can solve the problems that cannot be directly applied to space reactor nuclear energy engines, large neutron absorption cross-section, poor radiation resistance, etc., and achieve better anti-oxidation and corrosion effects, The effect of high density and low CVD temperature

Active Publication Date: 2022-04-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The composition of EBC coating is mostly rare earth oxides. Although rare earth silicate has excellent water and oxygen corrosion resistance, phase stability and low volatilization rate in high-speed gas environment, the neutron absorption cross section of rare earth is large, and the radiation resistance Poor lighting performance
Therefore, the existing EBC coating system cannot be directly applied to space reactor nuclear power engines that require radiation resistance.

Method used

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  • a kind of sic <sub>f</sub> /sic composite material surface anti-radiation anti-air oxidation composite coating and preparation method thereof
  • a kind of sic <sub>f</sub> /sic composite material surface anti-radiation anti-air oxidation composite coating and preparation method thereof
  • a kind of sic <sub>f</sub> /sic composite material surface anti-radiation anti-air oxidation composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] SiC by using a diamond grinder f / SiC composite material for surface grinding to ensure the flatness of the surface. 10×10×3mm SiC f / SiC composite material is the matrix, and the raw material composition of the inner coating is: 40% Si powder, 30% MoSi 2 powder, 20% Cr powder and 10% C powder.

[0054] Mix the powder according to the above raw material composition, and then use absolute ethanol as a ball milling medium, ball mill the raw materials at a speed of 200r / min for 10h for ball milling and mixing.

[0055] After ball milling, drying and grinding through a 300-mesh sieve to obtain the mixed portion,

[0056] Use PVB glue prepared with mass ratio of alcohol:PVB=50:1 as binder, prepare brushing slurry with mass ratio of mixed powder:PVB glue=3:10, and brush 3 to 5 times through woven mesh After each brushing, place the sample in an oven at 40°C to fully dry, and the drying time is 40 minutes. The thickness after brushing is about 70.50μm, and the weight gain...

Embodiment 2

[0058] Firstly, the SiCf / SiC composite material was roughened, cleaned and dried with 300-mesh SiC sandpaper, and the alloy powder with the mass percentage of Si 30%, MoSi 240%, Cr 25% and C 5% was ball-milled for 15 hours at a speed of Be 200r / min, subsequent steps are identical with embodiment 1. The CVD process is: deposition temperature: 1050°C, deposition pressure: 400-600Pa, carrier gas H2: 160ml / min, diluted H2: 200ml / min, Ar: 200ml / min, deposition time: 40h. After inspection, the prepared SiC / Si-Mo-Cr coating has good bonding strength with the SiCf / SiC composite material. After the coating is prepared, the mechanical properties are improved by 11.89%, and the oxidation resistance and radiation resistance are excellent: at 1400 ° C After oxidation for 10 hours, the weight gain is 0.20mg.cm-2, the retention rate of bending strength is about 92.30%, and the retention rate of bending strength after irradiation is about 84.50%.

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Abstract

The invention discloses a SiC f / SiC composite material surface anti-radiation anti-air oxidation composite coating and preparation method thereof, the composite coating comprises successively coating SiC f The inner coating and the outer coating formed on the surface of the SiC composite material, the main component of the inner coating is MoSi 2 , Si and Cr and contains C elements, and the outer coating is high-purity β-SiC. Made by brush coating + one CVD process. Composite coating provided by the present invention: on the one hand, the outer coating fully infiltrates the inner coating, and the coating structure is uniform and compact, and SiC f / SiC composite materials are well combined; on the other hand, the composite coating has excellent oxidation resistance, thermal shock resistance and radiation resistance, and the resulting SiC composite coating contains f / SiC composite material, the strength retention rate after oxidation at 1400 ° C for 10 h is greater than 92.20%, and the strength after 30 thermal cycles from 1400 ° C to room temperature is the same as that of pristine SiC f / SiC composite material has increased by more than 12.23%, and the ion energy is 6MeV Si 2+ The strength retention rate after irradiation is over 84.15%.

Description

technical field [0001] The present invention relates to a SiC f The invention discloses an anti-radiation anti-air oxidation composite coating on the surface of a SiC composite material and a preparation method thereof, belonging to the technical field of functional coatings. Background technique [0002] SiC f / SiC composite material is an excellent ceramic matrix composite material that can be used in both high temperature oxidation ablation environment and neutron irradiation environment. It is an important candidate material for space reactor nuclear energy engine service, and has special application requirements in other It has a very important application prospect in nuclear thermal and nuclear electric propulsion systems. [0003] However, in the engine working environment where multiple factors such as high temperature, corrosive medium, gas scour and complex application environment interact, SiC f Dense SiO generated by surface oxidation of / SiC composites 2 The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/89C04B41/52C04B41/009C04B41/5133C04B41/5096C04B41/5071C04B41/5001C04B41/4539C04B41/0072C04B41/5059C04B41/4531C04B35/806
Inventor 陈招科伍艳熊翔陈怡涵
Owner CENT SOUTH UNIV
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