镍基高温合金单晶的生长和氧化行为  

Bridgman Growth and Oxidation Behavior of Ni-Base Superalloy Single Crystals

作　　者：梁肖肖 童健 马昕迪 雷云 陈媛芝 武英[2] 徐家跃 LIANG Xiaoxiao;TONG Jian;MA Xindi;LEI Yun;CHEN Yuanzhi;WU Ying;XU Jiayue(Institute of Crystal Growth,School of Materials Science and Engineering,Shanghai Institute of Technology,Shanghai 201418,China;Advanced Technology & Materials Co.,Ltd.,China Iron & Steel Research Institute Group,Beijing 100081,China)

机构地区：[1]上海应用技术大学材料科学与工程学院晶体生长研究所,上海201418 [2]中国钢研科技集团有限公司安泰科技股份有限公司,北京100081

出　　处：《应用技术学报》2019年第2期119-124,共6页Journal of Technology

基　　金：国家自然科学基金(51572175)资助

摘　　要：采用改进型坩埚下降法生长了镍基高温合金单晶,使用氧化铝坩埚和〈001〉方向的籽晶,生长得到直径为30~40mm、长度260mm的晶棒。采用异型氧化铝坩埚,生长出特殊形状且中空的高温合金单晶涡轮机叶片构件。腐蚀显示所生长的晶体具有典型的镍基高温合金单晶形貌,在枝晶区域有少量的γ′/γ共晶,枝晶的平均间距是367μm,γ′相是立方结构且分布均匀。研究了晶体在900和1000℃氧化200h的氧化行为,氧化120h后其增重达到一个恒定值。Ni-base superalloy single crystals have been grown by the modified vertical Bridgman method.Using Al 2O 3 ceramics crucible and〈001〉-orientated seed,single crystals up to 30-40 mm in diameter and 260 mm in length were obtained.Special-shaped Al 2O 3 crucible was used and turbine blades were grown successfully.The morphology demonstrated the typical microstructure of the Ni-base superalloy single crystal with a minor ofγ′/γeutectic in the interdendritic region.The average dendrite arm space was 367μm and theγ′phase was cubical and distributed uniformly.The oxidation behavior was investigated at 900 and 1 000℃for 200 h,and the weight gain reached nearly a constant value when oxidized for 120 h.

关 键 词：NI基高温合金 晶体生长 微观结构 坩埚下降法 氧化行为 

分 类 号：TN216[电子电信—物理电子学]