Preparation method of iridium-aluminum high temperature oxidation resistance coating

A high-temperature anti-oxidation and coating technology, applied in the surface field, can solve the problems that restrict the development of high-temperature alloy/refractory metal research, and no reports on the preparation technology of iridium-aluminum coating, and achieve controllable and enhanced coating thickness. The effect of binding force, simple preparation method

Inactive Publication Date: 2010-02-10
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At the same time, the development and application of other platinum group metal aluminide coatings such as iridium aluminum high temperature anti-oxidation coating materials is still blank in the world, which seriously restricts the development of superalloy / refractory metal research.
[0005] After retrieving a large amount of literature, there has been no report on the preparation technology of iridium-aluminum coating

Method used

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  • Preparation method of iridium-aluminum high temperature oxidation resistance coating
  • Preparation method of iridium-aluminum high temperature oxidation resistance coating
  • Preparation method of iridium-aluminum high temperature oxidation resistance coating

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Effect test

Embodiment 1

[0018] The refractory metal-rhenium is firstly cleaned on the surface, put into 4M hydrochloric acid, taken out after about 3 minutes, washed in twice distilled water and dried. The treated rhenium is subjected to molten salt electroplating iridium. The electrolyte of molten salt electroplating is composed of 60% sodium cyanide, 38% potassium cyanide and 2% potassium iridium cyanide by weight. The plating temperature is 600°C and the cathode current density is 15mA / cm 2 Argon protection was used during the electroplating process, the electroplating time was 2 hours, and the thickness of the obtained iridium layer was 2 microns. The obtained samples were then subjected to powder embedding aluminizing treatment. The aluminizing agent is composed of aluminum powder, aluminum oxide powder and ammonium chloride, and the composition is 10% aluminum, 75% aluminum oxide powder and 15% ammonium chloride by weight percentage, which are mixed evenly. Embed the sample in a container con...

Embodiment 2

[0021] The refractory metal-rhenium is firstly cleaned on the surface, put into 8M hydrochloric acid, taken out after about 3 minutes, washed in twice distilled water and dried. The treated rhenium is subjected to molten salt electroplating iridium. The electrolyte of molten salt electroplating is composed of 65% sodium cyanide, 30% potassium cyanide and 5% potassium iridium cyanide by weight, the electroplating temperature is 700°C, and the cathode current density is 20mA / cm 2 Argon protection was used during the electroplating process, the electroplating time was 4 hours, and the thickness of the obtained iridium layer was 5 microns. The obtained samples were then subjected to powder embedding aluminizing treatment. The aluminizing agent is composed of aluminum powder, aluminum oxide powder and ammonium chloride, and the composition is 10% aluminum, 75% aluminum oxide powder and 15% ammonium chloride by weight percentage, which are mixed evenly. Embed the sample in a conta...

Embodiment 3

[0024] The refractory metal-rhenium is firstly cleaned on the surface, put into 10M hydrochloric acid, taken out after about 1.5min, washed in double distilled water and dried. Chemical vapor deposition of iridium uses transport gas to transport the iridium acetylacetonate vapor to the surface of the heated rhenium substrate, and the iridium acetylacetonate undergoes a thermal decomposition reaction to deposit iridium on the surface of the rhenium substrate to obtain a silver iridium film. The incoming oxygen reacts with the carbon generated by the decomposition of iridium acetylacetonate to generate carbon monoxide or carbon dioxide, and the gaseous products of the reaction are continuously discharged from the deposition chamber by the vacuum pump; the heating temperature of the rhenium substrate is 700°C, and the deposition time is 3 hours. The obtained iridium has a thickness of 2 micron; other parameters (such as the heating temperature of iridium acetylacetonate, oxygen fl...

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Abstract

The invention discloses a preparation method of iridium-aluminum coating, comprising the following steps: firstly performing surface cleaning and chemical treatment to the high temperature alloys or refractory metal substrates; then adopting electroplating process or chemical vapor deposition method to process the surface of the treated alloy to obtain a layer of pure iridium with a thickness of 0.5-10 microns; and finally performing pack cementation aluminizing at a certain temperature to obtain the iridium-aluminum coating. The bonding intensity between the iridium-aluminum coating and the substrate is high and the coating can be widely used in all kinds of high temperature alloys or refractory metals so as to increase the service life of the alloys or metals effectively and ensure the high temperature alloys or refractory metals to have excellent cold resistance, thermal shock resistance and high temperature oxidation resistance.

Description

technical field [0001] The invention belongs to the field of surface technology, in particular to a preparation method of an anti-oxidation coating for high-temperature alloys and refractory metals. Background technique [0002] In the fields of modern energy industry and aerospace industry, superalloys and refractory metals are indispensable and important materials. Today, superalloys and refractory metals have been widely used in various gas turbines and various spacecraft, rocket engines, nuclear reactors, submarines, thermal power plants, petrochemical equipment, etc. In order to ensure that these components have a certain service life during use, they must meet sufficient mechanical strength and good high-temperature oxidation resistance and hot corrosion performance, but superalloys and refractory metals are usually difficult to meet all of the above performance requirements at the same time. It is usually necessary to prepare a layer of high-temperature protective co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00
Inventor 闻明管伟明胡昌义李艳琼张俊敏
Owner KUNMING INST OF PRECIOUS METALS
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