Preparation and Oxidation Behaviour of an Al-Si Coating on a Ni3Al Based Single Crystal Superalloy IC21

摘要：

　　An Al-Si coating was prepared on IC21 alloy by powder pack cementation.The cyclic oxidation tests were carried out at 1150℃ in air for up to 100 h.The results indicate that the oxidation resistance of IC21 alloy is significantly improved by the Al-Si coating due to the presence of Ni2Al3 and β-NiAl enriched outer layer,and Si can effectively supress the outward diffusion of Mo.The oxide scales mainly consist of α-Al2O3,which is the favorite to the oxidation resistance.Phase transformation occurred from β-NiAl to γ′-Ni3Al and γ-Ni in the coating during oxidation.The coating still remained a certain amount of β phase after oxidation for 100h,which indicate a good protection.The microstructure change evolution was characterized,and the oxidation behavior of the coating was discussed.

关键词： Superalloy Al-Si coating High-temperature oxidation β-NiAl

作者: Yuzhuo Liu Qiong Wu Shusuo Li Yue Ma Shengkai Gong

作者单位: School of Material Science and Engineering, Beihang University, Beijing 100191, China

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 575-581

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）