镍基单晶铸件表面化学铣切的均匀性及深度  

Surface Uniformity and Milling Depth of Nickel-Based Single Crystal Castings after Chemical Milling

作　　者：曲彦平[1] 彭志江 王建[1] 吴俊宇[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]沈阳黎明航空发动机(集团)有限责任公司冶金所,辽宁沈阳110043

出　　处：《材料保护》2014年第3期59-60,62,共3页Materials Protection

摘　　要：镍基单晶铸件加工性能差,对此采用化学铣切工艺进行加工。通过单一变量法确定了不同浓度硝酸、盐酸、氢氟酸的化学铣切速率及变化规律,用SEM分析了不同浓度硝酸、盐酸、氢氟酸对铣切试样表面均匀性的影响。结果表明:最佳铣切工艺为120 mL/L硝酸,150 mL/L盐酸,185 mL/L氢氟酸;温度30℃,铣切表面均匀性好,且有一定的深度,铣切过程稳定可控。Chemical milling technique was adopted for the processing of Ni-based single crystal castings. The chemical milling rate and the variation pattern of different concentrations of nitric acid( HNO3),hydrochloric acid( HCl),and hydrofluoric acid( HF) were determined by single variable method.Moreover,a scanning electron microscope was performed to investigate the effect of chemical milling with different concentrations of HNO3,HCl,and HF on the surface uniformity of Nibased single crystal castings. Results indicated that the optimal concentration of various acids used for chemical milling of Ni-based single crystal castings was 120 mL /L HNO3,150 mL/L HCl,and 185 mL /L HF; and the optimal chemical milling temperature was 30 ℃. Resultant Ni-based single crystal castings after chemical milling exhibited desired surface uniformity and milling depth,while the chemical milling process was stable and readily controllable.

关 键 词：化学铣切 镍基单晶铸件 铣切速率 表面均匀性 

分 类 号：TG54[金属学及工艺—金属切削加工及机床]