High-temperature antioxidant multi-layer composite coating on surface of carbon-based material and preparation method of coating

A high-temperature anti-oxidation, carbon-based material technology, applied in the field of surface coatings, can solve the problems of complex coating preparation methods, inconvenient preparation of uniform coatings, overheating of Ir coatings, etc., and achieve excellent oxygen diffusion resistance, good physical and chemical properties Chemical Compatibility, Fast Deposition Effect

Active Publication Date: 2014-05-21
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this structure is that once the HfO 2 The layer peels off, and the Ir coating will be overheated locally, which will lead to the rapid failure of the Ir coating.
However, most of the above studies focus on the preparation and application of a single coating, failing to combine the advantages of each coating, and the coating preparation method is complicated and time-consuming, and some methods are not convenient for preparing uniform coatings on components with complex shapes

Method used

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  • High-temperature antioxidant multi-layer composite coating on surface of carbon-based material and preparation method of coating
  • High-temperature antioxidant multi-layer composite coating on surface of carbon-based material and preparation method of coating
  • High-temperature antioxidant multi-layer composite coating on surface of carbon-based material and preparation method of coating

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Experimental program
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Effect test

Embodiment 1

[0032] A kind of carbon base material surface high temperature anti-oxidation multi-layer composite coating of the present invention, such as figure 1 As shown, the multilayer composite coating is arranged on the surface of a carbon-based material substrate 1, and the carbon-based material substrate 1 is specifically a graphite substrate. The multilayer composite coating includes a Re transition layer 2 and an Ir coating layer 3 arranged in sequence from bottom to top. and Ir-Al coating, where the Ir-Al coating is IrAl coating 4 (bottom) and IrAl 2.7 -IrAl 3 Mixed coating 5 (top) constitutes a double-layer coating; the Re transition layer 2 has a thickness of 20 μm, the Ir coating 3 has a thickness of 13 μm, and the Ir-Al coating has a thickness of 22 μm.

[0033] A method for preparing a high-temperature oxidation-resistant multilayer composite coating on the surface of a carbon-based material according to the present embodiment, comprising the following steps:

[0034] (1)...

Embodiment 2

[0046] A high-temperature oxidation-resistant multilayer composite coating on the surface of a carbon-based material according to the present invention, the multilayer composite coating is arranged on the surface of a carbon-based material substrate 1, the carbon-based material substrate 1 is specifically a graphite substrate, and the multilayer composite coating includes The Re transition layer 2, the Ir coating 3 and the Ir-Al coating are sequentially arranged from bottom to top, wherein the Ir-Al coating is a single-layer IrAl coating 4; the thickness of the Re transition layer 2 is 200 μm, and the thickness of the Ir coating 3 The thickness is 6 μm, and the thickness of the Ir-Al coating is 5 μm.

[0047] A method for preparing a high-temperature oxidation-resistant multilayer composite coating on the surface of the above-mentioned carbon-based material, comprising the following steps:

[0048] (1) The carbon-based material is graphite. First, the graphite is polished with...

Embodiment 3

[0054] A high-temperature oxidation-resistant multilayer composite coating on the surface of a carbon-based material according to the present invention, the multilayer composite coating is arranged on the surface of a carbon-based material substrate 1, and the carbon-based material substrate 1 is specifically a carbon / carbon composite material substrate. The composite coating includes Re transition layer 2, Ir coating 3, and Ir-Al coating arranged sequentially from bottom to top, where the Ir-Al coating is IrAl coating 4 and IrAl coating 2.7 -IrAl 3 A double-layer coating composed of mixed coating 5; the thickness of the Re transition layer 2 is 60 μm, the thickness of the Ir coating 3 is 92 μm, and the thickness of the Ir-Al coating is 10 μm.

[0055] A method for preparing a high-temperature oxidation-resistant multilayer composite coating on the surface of the above-mentioned carbon-based material, comprising the following steps:

[0056] (1) The carbon-based material is a...

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Abstract

The invention discloses a high-temperature antioxidant multi-layer composite coating on the surface of a carbon-based material and a preparation method of the coating. The multi-layer composite coating is arranged on the surface of a carbon-based material matrix and comprises a Re transitional layer, an Ir coating and an Ir-Al coating which are sequentially arranged from bottom to top. The preparation method comprises the following steps: treating the carbon-based material to obtain the carbon-based material matrix; then, depositing the Re transitional layer; then, preparing the Ir coating on the Re transitional layer by a fused salt electroplating method; and then alumetizing solid powder to obtain the high-temperature antioxidant multi-layer composite coating on the surface of the carbon-based material. The multi-layer composite coating disclosed by the invention is good in antioxidant dispersity and strong in inoxidizability, and can realize high-temperature antioxidant protection of the carbon-based material. The preparation method is simple in process, quick in deposition velocity and strong in adaptability to matrix shape, and the coating is uniform in thickness.

Description

technical field [0001] The invention relates to the technical field of surface coatings, in particular to a high-temperature oxidation-resistant multilayer composite coating on the surface of a carbon-based material and a preparation method thereof. Background technique [0002] Carbon-based materials such as graphite, carbon / carbon composite materials, etc. have low density and thermal expansion coefficient, high thermal conductivity and chemical stability, and their strength does not decrease but increases with temperature, which is a promising high-temperature thermal structure. Therefore, it has attracted great attention in aviation, aerospace, nuclear energy and other industrial fields. However, carbon easily reacts with oxidizing gases at relatively high temperatures (above 400 °C), which significantly reduces its mechanical properties, which greatly limits its wide application as a high-temperature structural material in high-temperature oxidizing environments. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/90
Inventor 白书欣张虹叶益聪朱利安
Owner NAT UNIV OF DEFENSE TECH
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