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Study On High Temperature Oxidation Resistance And Hot Corrosion-resistant Of Al-Si-Y Coating

Posted on:2009-10-17Degree:MasterType:Thesis
Country:ChinaCandidate:G N RenFull Text:PDF
GTID:2121360248452188Subject:Materials science
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With the development of energy industry,the gas turbines had a development at very fast speed.The first rotor blades of gas turbines suffered high temperature oxidation and hot corrosion.In order to advance the using life and ensure the gas turbines run safely, besides improving the component of super-alloys,the method of spray,the design of blades,the best method is that using protect coatings,which had the development of diffusing coatings.Deposited Al-Si-Y alloy coating which made by cathode targets materials onЖC6Y Ni base alloy.The isothermal oxidation resistance at 1000℃and the corrosion behaviors of Al-Si-Y coating in molten 75%Na2SO4+25%K2SO4 at 850℃was studied.High temperature oxidation and corrosion behavior of Al-Si-Y coating in comparison with the import Al-Si-Y coating have been investigated,by using X-ray diffraction(XRD),scanning electron microscopy with an energy-dispersive X-ray analysis attachment(SEM/EDS).The result of the Vacuum Heat Treatment of Al-Si-Y coating show to us that the interdiffusion have occurred between the elements of the coating whose element had changed and the base-alloy,the bond strength of the coating and alloy was improved.The result of the high temperature oxidation resistance of Al-Si-Y coating show to us that the clearly mass change and high range mass change appear at the initial stage of the oxidation experiment,the mass change rate is not change after several hours.The above phenomenon is accord to the para-curve law and Al-Si-Y coating have good characteristics in this process.Compared with the base-alloy without the coating,the Al-Si-Y coating has the better character in the melt salt hot corrosion experiment (75%Na2SO4+25%K2SO4) at 900℃,but with time passing,the internal oxidation, vulcanization and a little drop have been found.Compared with the base-alloy without the coating and the import Al-Si-Y coating,Al-Si-Y coating made by cathode targets materials has the better high-temperature oxidation resistance performance than them.
Keywords/Search Tags:Al-Si-Y coating, oxidation resistance, corrosion behaviors
PDF Full Text Request
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