AC-HVAF和HVOF制备MCrAlY粘结层的组织结构及高温氧化性能  

Structure and High Temperature Oxidation Resistance of MCrAlY Coating Prepared by AC-HVAF and HVOF Processes

作　　者：杨二娟[1] 李太江[1] 李勇[1] 李巍[1] 刘刚[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710054

出　　处：《材料保护》2016年第2期25-29,7,共5页Materials Protection

基　　金：中国华能集团公司科学技术项目(HNKJ13-H04)资助

摘　　要：热障涂层金属粘结层的制备工艺影响涂层的微观组织结构及性能。采用活性燃烧-超音速火焰喷涂(AC-HVAF)和传统超音速火焰喷涂(HVOF)2种工艺喷涂制备NiCoCrAlTaY粘结层,并对2种粘结层的组织结构及高温氧化性能进行对比。结果表明:AC-HVAF喷涂层表面半熔颗粒的尺寸为(13.242±1.392)μm,孔隙率为(1.34±0.18)%,氧含量为0.630%,表面粗糙度为(10.12±0.36)μm;HVOF喷涂层表面半熔颗粒的尺寸为(19.438±2.413)μm,孔隙率为(5.96±2.11)%,氧含量为2.300%,表面粗糙度为(11.35±0.43)μm;AC-HVAF制备的NiCoCrAlTaY金属粘结层高温氧化后表面生成了以α-Al2O3为主的热生长氧化物(TGO),而HVOF制备的NiCoCrAlTaY金属粘结层高温氧化后表面生成了以Cr-Ni复合氧化物为主的TGO,AC-HVAF制备的金属粘结层具有更优异的抗氧化性能。NiCoCrAlTaY bonding coatings were prepared by sprayed active combustion high velocity air fuel( AC-HVAF) and conventional high velocity oxygen fuel( HVOF) processes,and the structures and high temperature oxidation resistance of two kinds of coatings were investigated and compared. Results showed that the AC-HVAF spraying coating exhibited the semi-molten particles with size of( 13. 242 ± 1. 392) μm,the porosity of( 1. 34 ± 0. 18) %,the oxygen content of 0. 630% and the surface roughness of( 10. 12 ± 0. 36) μm. While the HVOF spraying coating showed the semi-molten particles with size of( 19. 438 ± 2. 413) μm,the porosity of( 5. 96 ± 2. 11) %,the oxygen content of 2. 300%and the surface roughness of( 11. 35 ± 0. 43) μm. Besides,the thermal growth oxide( TGO) mainly composed of α-Al2O3 was formed on the surface of AC-HVAF spraying NiCoCrAlTaY bond coating,while TGO mainly composed of Cr-Ni composite oxides was formed on the surface of HVOF spraying NiCoCrAlTaY bond coating.

关 键 词：AC-HVAF HVOF NiCoCrAlTaY粘结层 组织结构 高温氧化性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]