NiCoCrAlY合金粉体形态及粒度分布对超音速等离子喷涂制备合金涂层氧化行为的影响研究  

Effects of NiCoCrAlY Alloy Powder Shape and Particle Size Distribution to Oxidation Behavior of Alloy Coating Prepared by Supersonic Plasma Spraying

作　　者：周莉[1] 张会盈 王斌利[1] 

机构地区：[1]西安航空发动机(集团)有限公司

出　　处：《热喷涂技术》2011年第3期38-43,53,共7页Thermal Spray Technology

摘　　要：以不同粒度分布的四种NiCoCrAlY合金粉体为原料,采用最新开发出的高效能超音速等离子喷涂技术制备合金涂层。分别对合金涂层进行"1000℃、8h预氧化+1100℃、100h氧化"及直接"1100℃、120h"高温氧化试验。对喷涂及氧化试验后的涂层进行SEM观察及EDX分析,结果表明:四种合金涂层在形成过程中,均发生了不同程度的内氧化,原始粉末粒度分布越宽,合金涂层的内氧化程度越大,而在随后的氧化试验过程中,越容易出现热生长氧化物(TGO)生长速度过快、组织粗大且不均匀的现象。对于高效能超音速等离子喷涂而言,合金原料粉体合理的粒径范围应在35～60μm之间。Different particle size distribution of the four NiCoCrA1Y alloy powders were sprayed by means of newly developed high-performance supersonic plasma spraying technology. Two tests：＂1000℃, 8h pre-oxidation ＋1100℃ ,100h oxidation＂ and direct ＂1100℃ ,120h＂ high-temperature oxidation test were carried out on the alloy coating,which were analyzed by means of SEM and EDX. Results show that：oxidation occurs in the spraying process,which become severer with the wider particle size distribution, and thermally grown oxide （TGO） grows more fast. For high-performance supersonic plasma spraying, the alloy raw material powder particle size range of reasonable circumference should be between 35-60 μm.

关 键 词：NICOCRALY 预氧化 高温氧化 粒度分布 热生长氧化物 

分 类 号：TG174.4[金属学及工艺—金属表面处理]