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用光学显微镜、X 光衍射、扫描电镜、能谱分析和化学分析等多种手段,对经热腐蚀后的K-3合金试样及渗铝的 K-3合金涡轮叶片进行了分折研究。结果表明叶片失效的原因是硫化及熔盐引起的热腐蚀;低铬、富难熔金属的 K-3合金的热腐蚀机制是硫化、碱性熔解和酸性熔解的综合作用。用 RFL 燃气腐蚀装置对不同的保护涂层进行抗热腐蚀性能的对比试验表明:渗铝的防护效果并不理想,而富硅的扩散型和融烧型料浆铝硅涂层则具有良好的抗热腐蚀性能。
The hot-corroded K-3 alloy specimens and aluminized K-3 alloy turbine blades were studied by means of optical microscope, X-ray diffraction, scanning electron microscopy, energy spectrum analysis and chemical analysis. The results show that the failure of the blade is due to hot corrosion caused by sulfidation and molten salt. The hot corrosion mechanism of K-3 alloy with low chromium and refractory metal is the combination of sulfidation, alkaline melting and acid melting. The comparative experiments on the corrosion resistance of different protective coatings by RFL gas corrosion equipment show that the protective effect of aluminizing is not satisfactory, while the silicon-rich diffusion-type and melt-burning slurry aluminum-silicon coatings have good Hot corrosion resistance.