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Multi-element gradient modified iridium coating layer and preparation method thereof

A coating and gradient technology, applied in the field of multi-gradient modified iridium coating and its preparation, can solve the problems of high equipment requirements, low efficiency, complex multi-layer coating technology and process, and achieve good integration, simple process flow, guarantee Effects of high temperature oxidation resistance and reliability

Active Publication Date: 2018-09-28
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, especially to overcome the deficiencies of the existing multi-layer coating preparation technology complex process, high equipment requirements and low efficiency, and to provide a high-temperature oxidation-resistant Ir-Al coating Multi-element gradient modified iridium coating with better performance, refractory metal oxide melting point and heat emissivity and preparation method thereof

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  • Multi-element gradient modified iridium coating layer and preparation method thereof
  • Multi-element gradient modified iridium coating layer and preparation method thereof
  • Multi-element gradient modified iridium coating layer and preparation method thereof

Examples

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Embodiment 1

[0048] A kind of multiple gradient modified iridium coating of the present invention, this multiple gradient modified iridium coating comprises the Re layer, the Ir layer, the Ir-Al layer and the permeation Hf layer that are arranged on the graphite substrate successively from bottom to top, wherein Ir- The thickness of the Al layer is about 15 μm, and the thickness of the Hf-infiltrated layer is about 4 μm.

[0049] A preparation method of the multiple gradient modified iridium coating of the present embodiment, comprising the following steps:

[0050] (1) Deposit a layer of 40 μm thick transition layer rhenium coating on the graphite substrate by chemical vapor deposition method (CVD method), and then deposit a layer of 40 μm thick iridium coating by molten salt electroplating method. Graphite samples with 40 μm Ir (the graphite substrate / rhenium / iridium system as the original material) were ultrasonically cleaned with ethanol for 10 min, then ultrasonically cleaned with dei...

Embodiment 2

[0056] A kind of multiple gradient modified iridium coating of the present invention, this multiple gradient modified iridium coating comprises Re layer, Ir layer, IrAl layer, IrAl layer that are arranged on graphite substrate successively from bottom to top 2.7(3) layer and permeated Hf layer, in which the thickness of IrAl coating is about 15μm, IrAl 2.7(3) The thickness of the layer is about 5 μm, and the thickness of the Hf-infiltrated layer is about 5 μm.

[0057] A preparation method of the multiple gradient modified iridium coating of the present embodiment, comprising the following steps:

[0058] (1) First deposit a layer of 40 μm thick transition layer rhenium coating on the graphite substrate by chemical vapor deposition method, and then deposit a layer of 40 μm thick iridium coating by molten salt electroplating method, for the deposition of 40 μm Re and 40 μm Ir The graphite samples were ultrasonically cleaned with ethanol for 10 min, then deionized water for 5 m...

Embodiment 3

[0064] A kind of multiple gradient modified iridium coating of the present invention, this multiple gradient modified iridium coating comprises Re layer, Ir layer, IrAl layer and impregnated Zr layer that are arranged on graphite substrate successively from bottom to top, wherein the IrAl coating The thickness is 15 μm, and the thickness of the Zr-impregnated layer is 2 μm.

[0065] A preparation method of the multi-element gradient modified iridium coating of the present invention, comprises the following steps:

[0066] (1) The graphite sample deposited with 40 μm Re and 40 μm Ir was ultrasonically cleaned with ethanol for 10 minutes, then ultrasonically cleaned with deionized water for 5 minutes, and then dried at 100 ° C for 10 minutes;

[0067] (2) Penetration agent preparation: Al powder, Al 2 o 3 The powder and the halogen donor are mixed until uniform, and the metal Al powder is 2%, and the metal oxide Al 2 o 3 Powder is 97%, halogen donor NH 4 Cl is 1%, and the i...

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Abstract

The invention discloses a multi-element gradient modified iridium coating layer and a preparation method thereof. The multi-element gradient modified iridium coating layer comprises a Re layer, an Irlayer, an Ir-Al layer and an X permeating layer arranged on a graphite substrate in sequence from bottom to top, wherein X=Hf, Zr or Cr. The preparation method comprises the following steps: (1) the graphite substrate / rhenium / iridium system is prepared as an original material; (2) Al powder, Al2O3 powder and a halogen supply agent are firstly mixed to prepare an Al permeating agent; and then, metal X powder, metal oxide XO powder and the halogen supply agent are mixed to prepare an X permeating agent; (3) an Ir-Al coating layer is prepared by adopting powder embedding solid permeation; and (4)an Ir-Al-X gradient coating layer is prepared by adopting powder embedding solid permeation; and finally, the multi-element gradient modified iridium coating layer is obtained. The prepared multi-element gradient modified iridium coating layer is more excellent in high-temperature oxidation resistance, refractory metal oxide melting point and heat radiation rate compared with a traditional high-temperature oxidation resistant coating layer.

Description

technical field [0001] The invention belongs to the technical field of high-temperature materials, and relates to an ultra-high temperature oxidation-resistant coating system and a preparation method thereof, in particular to a multi-element gradient modified iridium coating and a preparation method thereof. Background technique [0002] Attitude and orbit control engines are an important part of strategic and tactical weapons and various spacecraft. At present, bicomponent liquid rocket engines are widely used, and the commonly used propellants are dinitrogen tetroxide and hydrazine fuels, which have the advantages of high specific impulse, long life, and good pulse repetition performance. The combustion temperature of the fuel in the thrust chamber of the engine is as high as 2700°C. Even with liquid film cooling technology, its working temperature is still higher than 1000°C. The high temperature and the oxidizing atmosphere produced by the combustion of the propellant pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/58C23C28/02
CPCC23C10/58C23C28/021C23C28/028
Inventor 朱利安叶益聪白书欣艾园林张楷力张虹李顺唐宇
Owner NAT UNIV OF DEFENSE TECH
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