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

A zrb2-sic-y2o3-sic, composite material technology, applied in the surface field, can solve the problems of easy peeling of the coating, lower bonding force of the substrate, and cracks in the thermal expansion coefficient, so as to achieve the tendency of not easy to peel off, improve the bonding force, and reduce cracks Effect

Active Publication Date: 2021-06-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN110981546A discloses " C-C composite material surface oxidation resistance ZrB 2 -SiC-Y 2 o 3 Coating and its preparation method", the method will ZrB by atmospheric plasma spraying technology 2 -SiC-Y 2 o 3 Coated powder sprayed onto the surface of C-C substrate to prepare ZrB 2 -SiC-Y 2 o 3 The composite coating has a certain oxidation protection effect on the substrate, but in the process of cooling from high temperature oxidation, the coating will crack due to the mismatch of thermal expansion coefficient, and the bonding force with the substrate is reduced, and the coating is easy to peel off

Method used

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

[0033] From inside to outside, it includes C-C composite material matrix, SiC transition layer and ZrB 2 -SiC-Y 2 o 3 Outer coating; the powder for the SiC transition layer is made of Si, C, Al 2 o 3 Powder blended, Al 2 o 3 The mass ratio of powder to Si and C mixed powder is 1:9, and the mass fraction of Si powder to Si and C mixed powder is 60-70%; the average particle size of the powder used in the transition layer is not more than 50 μm, and the purity is not higher Less than 99.5%.

[0034] Anti-oxidation ZrB on the surface of the above C-C composites 2 -SiC-Y 2 o 3 -The preparation method of the SiC coating is prepared by two-step embedding and infiltration technology, which specifically includes the following steps:

[0035] Step 1, substrate pretreatment

[0036] Grind and polish the C-C composite material substrate with a shape and size of 15mm×15mm×10mm, and chamfer the corners and corners, use absolute ethanol for ultrasonic cleaning and drying, and use c...

Embodiment 2

[0047] From inside to outside, it includes C-C composite material matrix, SiC transition layer and ZrB 2 -SiC-Y 2 o 3 Outer coating; the powder for the SiC transition layer is made of Si, C, Al 2 o 3 Powder blended, Al 2 o 3 The mass ratio of powder to Si and C mixed powder is 1:9, and the mass fraction of Si powder to Si and C mixed powder is 70-80%; the average particle size of the powder used in the transition layer is not more than 50 μm, and the purity is not higher than Less than 99.5%.

[0048] Anti-oxidation ZrB on the surface of the above C-C composites 2 -SiC-Y 2 o 3 -The preparation method of SiC coating, comprises the following steps:

[0049] Step 1, substrate pretreatment

[0050] Grind and polish the C-C composite material substrate with a shape and size of 15mm×15mm×10mm, and chamfer the corners and corners, use absolute ethanol for ultrasonic cleaning and drying, and use corundum powder to sandblast the surface of the substrate before use ;

[0051...

Embodiment 3

[0060] From inside to outside, it includes C-C composite material matrix, SiC transition layer and ZrB 2 -SiC-Y 2 o 3 Outer coating; the powder for the SiC transition layer is made of Si, C, Al 2 o 3 Powder blended, Al 2 o 3 The mass ratio of powder to Si and C mixed powder is 1:9, and the mass fraction of Si powder to Si and C mixed powder is 80% to 90%; the average particle size of the powder used in the transition layer is not more than 50 μm, and the purity is not higher than Less than 99.5%.

[0061] Anti-oxidation ZrB on the surface of the above C-C composites 2 -SiC-Y 2 o 3 -The preparation method of SiC coating, comprises the following steps:

[0062] Step 1, substrate pretreatment

[0063] Grind and polish the C-C composite material substrate with a shape and size of 15mm×15mm×10mm, and chamfer the corners and corners, use absolute ethanol for ultrasonic cleaning and drying, and use corundum powder to sandblast the surface of the substrate before use ;

[...

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Abstract

The invention discloses an antioxidant ZrB2-SiC-Y2O3-SiC coating on the surface of a C-C composite material, and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a SiC transition layer on the surface of a C-C composite material matrix by virtue of an embedding infiltration technology, and continuously preparing a ZrB2-SiC-Y2O3 outer coating on the SiC transition layer by virtue of embedding infiltration. The SiC transition layer is introduced between the ZrB2-SiC-Y2O3 coating and the matrix, so that the effects of relieving mismatching of thermal expansion coefficients and releasing thermal stress can be achieved, and the oxidation resistance of the coating is further improved. The ZrB2-SiC-Y2O3-SiC composite coating is prepared by adopting a two-step embedding infiltration technology, so that the thermal damage to a C-C matrix is small, the binding force of the coating is strong, and the coating is compact. The SiC transition layer effectively relieves mismatching of thermal expansion coefficients of the outer coating and the base body, reduces cracks, caused by thermal stress, of the outer coating, improves the binding force of the coating, and effectively improves the oxidation resistance of the coating.

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 -SiC coating and its preparation method. Background technique [0002] C-C composite material, that is, carbon fiber reinforced carbon matrix composite material, is a high-performance structural material that is focused on research in the high-tech field. The C-C composite material is only composed of carbon elements, which not only retains the original excellent properties of the matrix carbon, but the carbon fiber overcomes the shortcomings of the matrix carbon, and has low density, high strength, high thermal conductivity, low thermal expansion coefficient, friction and wear resistance, good The characteristics of high temperature resistance and thermal shock resistance, especially its excellent high temperature mechanical properties, and the fact that the strength does not decrease but increases with the increase o...

Claims

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Application Information

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IPC IPC(8): C04B41/89
CPCC04B41/89C04B41/52C04B41/009C04B41/5059C04B41/4545C04B41/455C04B41/5045C04B41/507C04B41/0072C04B35/83
Inventor 缪强马汉春梁文萍林浩刘阳阳薛林史伟伟许肖于海洋
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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