【摘要】 采用喷丸处理及溶胶 凝胶工艺涂覆ZrO2/Al2O3叠层对Cr5Mo合金进行了表面处理,研究了不同处理的合金试样在600℃空气中的高温氧化性能。从SEM,XRD及氧化动力学分析结果发现,喷丸处理不能使Cr5Mo合金表面形成保护性的氧化铬膜,反而促进了Cr5Mo合金的高温氧化,其氧化增重与氧化剥落速率最高;ZrO2/Al2O3叠层通过稀土效应改变了氧化膜的生长机制,降低了氧化铬膜的生长速率,促进了合金表面铬的选择氧化,起到了优异的保护作用,大大提高了合金的抗高温氧化性能。更多还原

【Abstract】 s:Shot peening and ZrO₂/Al₂O₃ terrace coating by sol-gel technique are applied to Cr5Mo alloy,and their high-temperature oxidation properties have been studied.SEM,XRD and oxidation kinetics curves indicate that shot peening can not promote the forming of protective Cr₂O₃scale,on the countary it accelerates the oxidation of the alloy,and its weight gain and spallation weight are highest.ZrO₂/Al₂O₃ terrace coating by sol-gel technique alters the growth mechnism of scale through reactive element reactive,and decreases the growth rate of Cr₂O₃ scale.The high-temperature oxidation resistance of alloy is improved greatly due to the selective oxidation of Cr on the surface of the alloy based on sol-gel process.更多还原