双面氧化弯曲法研究钇对氧化膜内应力的影响

DEFLECTION METHOD FROM BOTH FACES OXIDATION TO STUDY EFFECT OF Y ON INTERNAL STRESS OF OXIDE SCALE

采用条状试样单面离子注入稀土钇双面氧化弯曲的氧化膜应力分析技术,研究了钇对形成Al_2O_3的合金和涂层氧化膜生长应力的影响,结果表明,在实验注入的剂量范围,钇能降低Co—30Cr—6Al溅射涂层上氧化膜应力,相反地增大了Fe一23Cr—5Al合金上氧化膜应力,认为其原因在于钇是否促进了氧化膜的塑性形变,另外,注入钇的Co—30Cr—6Al涂层初始氧化时膜内应力的变化与钇对涂层氧化机制的影响有关。

An investigation was carried out of the effect of Y addition upon the internal stress of Al_2O_3 scale formed during oxidation of sputtering coating on Co-30Cr-6Al alloy and the growth stress of oxidized film on Fe-23Cr-5Al alloy heating up to 900℃ in air, us- ing a specially designed deflection method from thin strip specimen with coatings, ion-im- planted Y on one face and oxidized onto both faces. Results indicate that Y may decrease the internal stress of oxide scale on 2×10^(17)Y^+/ cm^2 implanted Co-30Cr-6Al coating, and in- crease one on 2×10^(16)Y^+/ cm^2 implanted Fe-23Cr-5Al alloy. This seems due to promoting or not by Y to the plastic deformation of oxide scale. In addition, at the initial oxidation stage, the change of growth stress of oxide scale formed on Y-implanted Co-30Cr-6Al coat- ing may be related to the influence of Y on oxidation process of the coating.