Pd对K17合金低压固体粉末包埋渗铝工艺的影响  

Influence of Palladium on Aluminizing Process by Low Press Packing Cementation for K17 Superalloy

作　　者：张光业[1] 张华 张厚安[1] 尹何迟[1] 郭建亭[2] 

机构地区：[1]湖南科技大学机械设备健康维护省重点实验室,湖南湘潭411201 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《贵金属》2006年第4期47-52,共6页Precious Metals

基　　金：国家自然科学基金重大项目(No.59895152);"863"高技术项目(No.863-715-005-0030)

摘　　要：研究了在高温合金K17表面上低压固体粉末包埋(LPPC)渗铝工艺。实验结果表明:在合金表面电镀Pd-20wt%Ni合金后,在950℃和1050℃渗铝制备铝化物涂层,与未经过电镀处理的样品相比,其渗铝速度得到提高,形成铝化物涂层的动力学在950℃和1050℃时符合抛物线规律。在950℃时,“S”渗铝量占总渗铝量的比例略大于18%,在1050℃时该比例为44.2%～47%,和渗铝温度有关,与样品预处理状态无关;提高渗铝温度,“S”渗铝比例提高。Pd元素加快了元素的扩散速度,促进了涂层的生长。The aluminizing process by low press packing cementation （LPPC） on the surface of K17 superalloy was investigated in this paper. The results indicated that the aluminizing rate for the specimen with electric plating of Pd-20wt%Ni is faster than that of pure K17 superalloy at the tested temperatures. The kinetic curves obey the relation of parabolic at 950℃ and 1050℃, respectively. The proportion of aluminizing content of ＂S＂ to the total aluminizing content is over 18% and 44.2%-47% at 950℃ and 1050℃ respectively. With the increasing aluminizing temperature, the proportion of ＂S＂ aluminizing content becomes larger, it only depends on the process. The diffusive rate of elements becomes faster and the growth rate of coating is improved because of modification of palladium.

关 键 词：金属材料 高温合金 铝化物涂层 低压固体粉末包埋渗铝 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TG156.86[金属学及工艺—合金]