Antioxidative ZrB2-SiC-Y2O3 coating on surface of C-C composite material and preparation method thereof

A composite material, zrb2-sic-y2o3 technology, applied in the surface field, can solve the problems that C/C composite materials cannot be effectively protected, the viscosity of oxidation products is easy to evaporate, and the mechanical erosion effect is intensified, so as to improve the anti-oxidation effect and coating Layer thickness controllable, reducing the effect of cracking

Inactive Publication Date: 2020-04-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] CN103422046A discloses "a preparation method of zirconium diboride-silicon carbide high-temperature anti-oxidation coating", which uses ultra-low pressure plasma spraying technology to apply ZrB 2 - SiC coated powder sprayed onto the surface of the substrate to prepare ZrB 2 -SiC composite coating can avoid SiC volatilization to a certain extent and improve the oxidation resistance of the coating. 2 -SiC coating oxidation rate is too fast
Document 1 (Jiao Gengsheng, Lu Guofeng, Li Hejun. Surface Y of C/C-SiC composite materials 2 o 3 -ZrO 2 -Al 2 o 3 Preparation of coating by brushing method and its high temperature oxidation resistance [J].Material Protection. 2014,47(7):9-11.) discloses a preparation of Y by embedding method and brushing method 2 o 3 -ZrO 2 -Al 2 o 3 / SiC coating method, the coating is oxidized at 1873K for 19 hours, and the weight loss rate is only 1.76%, which has good short-term high-te

Method used

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  • Antioxidative ZrB2-SiC-Y2O3 coating on surface of C-C composite material and preparation method thereof
  • Antioxidative ZrB2-SiC-Y2O3 coating on surface of C-C composite material and preparation method thereof
  • Antioxidative ZrB2-SiC-Y2O3 coating on surface of C-C composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] Oxidation-resistant ZrB on the surface of C-C composites 2 -SiC-Y 2 o 3 coating, by Y 2 o 3 , ZrB 2 Prepared by mixing with SiC powder, the Y 2 o 3 The mass fraction is 5%, ZrB 2 and the overall mass fraction of SiC powder is 95%, and ZrB 2 The mass ratio of SiC to SiC is 3:1.

[0033] Anti-oxidation ZrB on the surface of the above C-C composites 2 -SiC-Y 2 o 3 The preparation method of coating comprises the following steps:

[0034] Step 1, substrate pretreatment

[0035] The C / C composite substrate with a size of 15mm×15mm×10mm was polished and chamfered at the corners, ultrasonically cleaned and dried with anhydrous ethanol, and the surface of the substrate was sandblasted with corundum before use.

[0036] Step 2, Prepare thermal spray powder by spray granulation technology

[0037] 1) ZrB 2 Mix with SiC powder at a mass ratio of 3:1, and weigh ZrB with a mass fraction of 95%. 2 , SiC two-phase mixed powder and Y with a mass fraction of 5% 2 o 3 Th...

Embodiment 2

[0045] Oxidation-resistant ZrB on the surface of C-C composites 2 -SiC-Y 2 o 3 coating, by Y 2 o 3 , ZrB 2 Prepared by mixing with SiC powder, the Y 2 o 3 The mass fraction is 10%, ZrB 2 and the overall mass fraction of SiC powder is 90%, and ZrB 2 The mass ratio of SiC to SiC is 3:1.

[0046] Anti-oxidation ZrB on the surface of the above C-C composites 2 -SiC-Y 2 o 3 The preparation method of coating comprises the following steps:

[0047] Step 1, substrate pretreatment

[0048] The C / C composite substrate with a size of 15mm×15mm×10mm was polished and chamfered at the corners, ultrasonically cleaned and dried with anhydrous ethanol, and the surface of the substrate was sandblasted with corundum before use.

[0049] Step 2: Preparation of thermal spray powder by spray granulation technology:

[0050] 1) ZrB 2 Mix with SiC powder at a mass ratio of 3:1, and weigh ZrB with a mass fraction of 90% 2 , SiC two-phase mixed powder and Y with a mass fraction of 10% ...

Embodiment 3

[0062] Oxidation-resistant ZrB on the surface of C-C composites 2 -SiC-Y 2 o 3 coating, by Y 2 o 3 , ZrB 2 Prepared by mixing with SiC powder, the Y 2 o 3 The mass fraction is 15%, ZrB 2 and the overall mass fraction of SiC powder is 85%, and ZrB 2 The mass ratio of SiC to SiC is 3:1.

[0063] Anti-oxidation ZrB on the surface of the above C-C composites 2 -SiC-Y 2 o 3 The preparation method of coating comprises the following steps:

[0064] Step 1, substrate pretreatment

[0065] The C / C composite substrate with a size of 15mm×15mm×10mm was polished and chamfered at the corners, ultrasonically cleaned and dried with anhydrous ethanol, and the surface of the substrate was sandblasted with corundum before use.

[0066] Step 2: Preparation of thermal spray powder by spray granulation technology:

[0067] 1) ZrB 2 Mix with SiC powder at a mass ratio of 3:1, and weigh ZrB with a mass fraction of 85%. 2 , SiC two-phase mixed powder and Y with a mass fraction of 15% ...

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Abstract

The invention discloses an antioxidative ZrB2-SiC-Y2O3 coating on the surface of a C-C composite material and a preparation method thereof. The preparation method comprises the following steps: preparing thermally-spraying spherical agglomerated powder by virtue of a spray granulation technology; and then preparing the ZrB2-SiC-Y2O3 multi-element composite coating by virtue of an atmospheric plasma spraying technology. According to the invention, the rare earth oxide Y2O3 is introduced into ZrB2-SiC ceramic powder, so the effects of enhancing ZrO2-phase stability and inhibiting phase change are achieved, and the oxidation ablation resistance of the coating can be improved. The ZrB2-SiC-Y2O3 composite coating is prepared by adopting the atmospheric plasma spraying technology, so thermal damage to a C/C composite material matrix is small, and the thickness of the coating is controllable. The coating system forms yttrium silicate with low oxygen diffusivity under the condition of oxidation at 1450 DEG C, can effectively inhibit the volatilization of a SiO2 glass phase, and has a certain self-healing effect.

Description

technical field [0001] The invention belongs to the field of surface technology, in particular to a C-C composite surface anti-oxidation ZrB 2 -SiC-Y 2 o 3 Coatings and methods for their preparation. Background technique [0002] C / C composite material has excellent characteristics such as low density, high strength and specific modulus, high thermal conductivity, good ablation resistance and friction and wear resistance, especially its high-temperature mechanical properties are excellent, and the strength increases with temperature (1000 ℃~2300℃), the unique property of not falling but increasing makes it have the incomparable advantages of other materials, and has been used as an ablation-resistant and thermal structural material for long-term use at high temperatures. However, these characteristics of C / C composites can only be maintained in an inert atmosphere. In the absence of effective protection measures, their oxidation and ablation resistance is poor, and they a...

Claims

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Application Information

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IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/507C04B41/87C04B41/5059C04B41/5045C04B41/4545C04B41/4527C04B35/83
Inventor 缪强李阳梁文萍林浩黄朝军刘睿翔马汉春孙自旺赵子龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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