摘要
研究了HVOF CoNicrAlY和HVOF CoNiCrAlY/搪瓷复合涂层在900℃空气中氧化,以及850℃下75％NaCl+25％Na_2SO_4(质量分数,下同)熔盐中的腐蚀行为.结果表明:CoNiCrAlY涂层的抗热腐蚀能力由于NaCl的加入而受到严重影响,但CoNiCrAlY/搪瓷复合涂层在850℃的75％NaCl+25％Na_2SO_4中表现出良好的抗热腐蚀能力;在900℃的空气中,搪瓷层不但显著提高了CoNiCrAlY层的抗氧化能力,并且具有良好的粘附性,没有明显的剥落。
The oxidation and hot corrosion behaviour of a Co-Ni-Cr-Al-Y coating produced by High-Velocity Oxygen Fuel (HVOF) with and without an enamel coating have been investigated in air at 900°C and in molten 75% NaCl+25% Na2SO4 at 850°C (mass fraction). The results show that the enamel coating possesses an excellent hot corrosion resistance in the molten salt, in comparison with the HVOF-sprayed Co-Ni-Cr-Al-Y coating alone. In the hot corrosion test, breakaway corrosion did not occur on the samples with the enamel coating and the composition of the enamel did not change significantly either. The oxidation resistance of the Co-Ni-Cr-Al-Y coating was also improved by the enamel coating in air at 900°C. The enamel coating has a good adhesion ability, no spallation in the enamel coating is found during the isothermal oxidation test.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2003年第6期583-589,共7页
Chinese Journal of Materials Research
基金
国家自然科学基金No.59971052
