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Rare earth oxide modified Si-Mo-O gradient anti-oxidation coating layer and production method thereof

A technology of rare earth oxides and anti-oxidation coatings, which is applied in the field of high-temperature anti-oxidation, can solve the problems of inter-diffusion of components between coatings, lack of composition gradients in coatings, and easy cracking of coatings, etc., and achieve excellent high-temperature oxidation resistance. Significant economic and social benefits, the effect of low porosity

Active Publication Date: 2016-09-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the common methods of preparing C / C composite anti-oxidation coatings (embedding method, CVD method, etc.) are to directly coat the coating on the surface of the substrate. There is no composition gradient between the prepared coatings, and the interaction of the components between the coatings Diffusion is limited
During high and low temperature cycle use, due to the thermal expansion coefficient mismatch between the coating and the substrate and between the coatings, the coating is easy to crack and the substrate is oxidized

Method used

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  • Rare earth oxide modified Si-Mo-O gradient anti-oxidation coating layer and production method thereof
  • Rare earth oxide modified Si-Mo-O gradient anti-oxidation coating layer and production method thereof

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Experimental program
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Effect test

Embodiment approach 1

[0025] 1) C / C composite material (density 1.65-1.75g / cm 3 ) Grind the chamfer with sandpaper and ultrasonically clean with alcohol for 10-20min, and dry the cleaned sample in an oven at 60-90℃ for 4-10h for later use.

[0026] To prepare a gradient coating on the surface of the C / C composite material, first embed the SiC inner coating to relieve the thermal stress caused by the difference in thermal expansion coefficient between the substrate and the coating, and then prepare SiC-MoSi 2 The intermediate transition layer solves the problem of thermal adaptation between the inner and outer coatings, and then sprays the rare earth oxide modified Si-Mo-O outer coating, and finally soaks it in a silica sol solution and heats it, seals the holes, and improves the density of the coating surface .

[0027] 2) Preparation method of inner coating: weigh 75% Si powder, 20% C powder, 5% Al 2 o 3 powder, put the mixed powder into a ball mill to mix evenly, and dry it, then put the powde...

Embodiment approach 2

[0032] 1) C / C composite material (density 1.65-1.75g / cm 3 ) Grind the chamfer with sandpaper and ultrasonically clean with alcohol for 10-20min, and dry the cleaned sample in an oven at 60-90℃ for 4-10h for later use.

[0033] To prepare gradient coatings on the surface of C / C composite materials, first prepare SiC inner coatings to relieve the thermal stress caused by the mismatch of thermal expansion coefficients between the substrate and coatings, and then prepare SiC-MoSi 2 The intermediate transition layer solves the problem of thermal adaptation between the inner and outer coatings, and then sprays the rare earth oxide modified Si-Mo-O outer coating, and finally soaks it in a silica sol solution and heats it, seals the holes, and improves the density of the coating surface .

[0034] 2) Preparation method of inner coating: weigh 75% Si powder, 20% C powder, 5% Al 2 o 3 Put the mixed powder into a ball mill and mix it evenly, then dry it, then put the powder into a sma...

Embodiment approach 3

[0039] 1) C / C composite material (density 1.65-1.75g / cm 3 ) Grind the chamfer with sandpaper and ultrasonically clean with alcohol for 10-20min, and dry the cleaned sample in an oven at 60-90℃ for 4-10h for later use.

[0040] To prepare a gradient coating on the surface of the C / C composite material, first embed the SiC inner coating to relieve the thermal stress caused by the mismatch between the thermal expansion coefficient between the substrate and the coating, and then prepare SiC-MoSi 2 The intermediate transition layer solves the problem of thermal adaptation between the inner and outer coatings, and then sprays the rare earth oxide modified Si-Mo-O coating, and finally soaks it in a silica sol solution and heats it to seal the pores to increase the density of the coating surface.

[0041] 2) Preparation method of inner coating: weigh 75% Si powder, 20% C powder, 5% Al 2 o 3 Put the mixed powder into a ball mill and mix it evenly, then dry it, then put the powder int...

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Abstract

The invention relates to a rare earth oxide modified Si-Mo-O gradient anti-oxidation coating layer and a production method thereof. The production method comprises the following steps: embedding a SiC internal coating layer in the surface of a sample to alleviate heat stress caused by a difference between the thermal expansion coefficients of a matrix and the coating layer, producing a SiC-MoSi2 intermediate transition layer to solve the heat adaption problem between the internal coating layer and an external coating layer, spraying a rare earth oxide modified Si-Mo-O external coating layer, immersing the obtained sample in a silica sol solution, carrying out heat treatment, and sealing holes to improve the compactness of the coating surface. The rare earth oxide modified Si-Mo-O gradient anti-oxidation coating layer produced in the invention has the advantages of few surface defects, low porosity, high compactness, low oxygen permeability, strong bonding force between coating layers, and difficult cracking. LaSiO5, La2Si2O5 and Y2Si2O5 formed by liquid rare earth oxides (La2O3 and Y2O3) can stabilize a SiO2 glass phase in the anti-oxidation process, so the compactness of the coating layer is improved, the endosmosis of oxygen is blocked, and the anti-oxidation performance is substantially improved. The method has the advantages of very large application potential, and substantial economic and social benefits.

Description

technical field [0001] The invention belongs to the high-temperature anti-oxidation field of carbon / carbon (C / C) composite materials, and relates to a rare earth oxide modified Si-Mo-O gradient anti-oxidation coating and a preparation method. Background technique [0002] Carbon / carbon (C / C) composite materials have excellent properties such as low density, low thermal expansion coefficient, stable friction coefficient, and ablation resistance. Structural materials. However, C / C composites will start to oxidize when they exceed 450 °C, and their mechanical properties will decrease significantly, which seriously restricts their further application as high-temperature structural materials under oxidizing atmosphere. An effective way to solve the problem of high temperature oxidation is to isolate the oxidizable carbon substrate from the oxygen-containing environment, and the multi-component gradient composite coating is an effective means to solve this problem. [0003] Refr...

Claims

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Application Information

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IPC IPC(8): C04B41/89C04B35/83
CPCC04B41/009C04B41/52C04B41/89C04B2235/9684C04B35/83C04B41/5059C04B41/455C04B41/4545C04B41/5071C04B41/4527C04B41/5045C04B41/5035C04B41/4535
Inventor 史小红王昌聪李贺军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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