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A kind of ceramic coating with high temperature resistance and oxidation resistance and preparation method thereof

A ceramic coating and anti-oxidation technology, which is applied in the field of high-temperature ceramic coatings, can solve the problems of poor SiO2 fluidity, insignificant substrate protection effect, and inability to heal substrate surface cracks, etc., to achieve the effect of improving density and high temperature resistance

Active Publication Date: 2022-08-09
江西信达航科新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the SiC coating with a single component has poor fluidity in the middle temperature range (800-1200°C) oxidation product SiO2 [Jiang Yan, Feng Dong, Ye Chaochao, et al. Preparation and performance characterization of Si-SiC coating coated graphite material[J]. Journal of Materials and Metallurgy, 2018,17(1):50-55.], unable to heal the cracks on the surface of the substrate, forming a dense coating, the protective effect on the substrate is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0033] 1. Grind the C / C composite material with 800-grit sandpaper to remove the surface relief; soak it in 1mol / L NaOH solution for 1 hour, take it out, place it in anhydrous ethanol for ultrasonic vibration for 20min, and use pure anhydrous ethanol Rinse and dry in a muffle furnace at 60°C.

[0034] 2. Ti 3 SiC 2 Powder and Si powder are mixed and placed in H 2 O 2 In the solution, the water bath was heated to 50 °C and stirred for 2 hours; the powder was taken out, dried in a muffle furnace at 50 °C until completely free of moisture, sieved, and recorded as mixed powder 1; among them, Ti 3 SiC 2 And Si powder particle size is 800 mesh; Ti 3 SiC 2 The mass ratio to Si powder is 4:1; H 2 O 2 In solution, H 2 O 2 The mass fraction is 25%.

[0035] 3. Add xylene as a solvent to the liquid polycarbosilane (PCS), add mixed powder 1 to it and keep stirring for 1 hour; add divinylbenzene (DVB) dropwise to it, heat it to 40°C in a water bath, and stir until the solvent I...

specific Embodiment 2

[0044] 1. Grind the C / C composite material with 800-grit sandpaper to remove the surface relief; soak it in 1mol / L NaOH solution for 2 hours, take it out, place it in anhydrous ethanol for ultrasonic vibration for 30 minutes, and use pure anhydrous ethanol. Rinse and dry in a muffle furnace at 80°C.

[0045] 2. Ti 3 SiC 2 Powder and Si powder are mixed and placed in H 2 O 2 In the solution, the water bath was heated to 60 °C and stirred for 4 hours; the powder was taken out, dried in a muffle furnace at 60 °C until completely free of moisture, sieved, and recorded as mixed powder 1; among them, Ti 3 SiC 2 and Si powder particle size is 1200 mesh; Ti 3 SiC 2 The mass ratio of Si powder is 4:3; H 2 O 2 In solution, H 2 O 2 The quality score is 40%.

[0046] 3. Add xylene as a solvent to the liquid polycarbosilane (PCS), add mixed powder 1 to it and keep stirring for 2 hours; add divinylbenzene (DVB) dropwise to it, heat it to 50°C in a water bath, and stir until the s...

specific Embodiment 3

[0055] 1. Grind the C / C composite material with 800-grit sandpaper to remove the surface relief; soak it in a 1mol / L NaOH solution for 2 hours, take it out, place it in anhydrous ethanol for ultrasonic vibration for 20 minutes, and use pure anhydrous ethanol. Rinse and dry in a muffle furnace at 60-80°C.

[0056] 2. Ti 3 SiC 2 The powder and Si powder were mixed, placed in a H2O2 solution, heated to 55 °C in a water bath and stirred for 3 hours; the powder was taken out, dried in a muffle furnace at 55 °C until completely free of moisture, sieved, and recorded as mixed powder 1; among them, Ti 3 SiC 2 And Si powder particle size is 1000 mesh; Ti 3 SiC 2 The mass ratio to Si powder is 4:2; in H2O2 solution, H 2 O 2 The mass fraction is 30%.

[0057] 3. Add xylene as a solvent to the liquid polycarbosilane (PCS), add mixed powder 1 to it and keep stirring for 1 hour; add divinylbenzene (DVB) dropwise to it, heat it to 45°C in a water bath, and stir until the solvent If t...

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Abstract

The invention provides a method for preparing a ceramic coating with high temperature resistance and oxidation resistance. The modified PCS is firstly coated on the surface of a C / C composite material, and a dense SiC coating is formed on the surface after high temperature sintering. The coating can completely cover the surface of the C / C composite material and block the contact between the C / C composite material and oxygen; the modified filler Ti 3 SiC 2 It reacts with Si powder at high temperature with free carbon and oxygen in C / C composites and PCS decomposition products to form ceramic phase TiO with good fluidity 2 and SiO 2 , filling the pores and cracks on the surface of the material. Then use plasma spraying technology to continue to prepare a layer of Al outside the original SiC coating 2 O 3 and ZrO 2 The modified SiC coating improves the density and high temperature resistance of the coating. At the same time, the composite coating prepared by the invention has excellent bonding performance with the matrix and is not easy to fall off, has good high temperature resistance and oxidation resistance, and can protect the matrix material from being oxidized at high temperature.

Description

technical field [0001] The invention belongs to the technical field of high-temperature ceramic coatings, in particular to a high-temperature and oxidation-resistant ceramic coating and a preparation method thereof. Background technique [0002] Due to its light weight, high strength, and good high temperature resistance in an oxygen-free environment, C / C composites have shown great application prospects in aerospace, rocket and missile fields. However, C / C composites oxidize at 400 °C in an aerobic environment, and their properties are seriously degraded, even leading to overall failure of the material, which restricts the application of C / C composites as high-temperature structural materials. [0003] The preparation of a layer of SiC coating on the surface of C / C composites is one of the important methods to improve the high temperature oxidation resistance of C / C composites. The SiC coating has high strength and large modulus, and is similar to the thermal expansion coe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/89C04B41/52C04B41/009C04B35/83C04B41/5059C04B41/4558C04B41/5031C04B41/5042
Inventor 吴宝林侯振华吴迪
Owner 江西信达航科新材料科技有限公司
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