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
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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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