摘要
采用爆炸喷涂工艺在单晶镍基高温合金上制备NiCrAlTaY抗氧化防护涂层.借助XRD,SEM和EDS等技术对涂层的组织结构、表面硬度与粘结强度进行分析.结果显示;涂层由γ-Ni,γ’-Ni3Al,β-NiAl和喷涂过程中的氧化产物α-Al2O3组成.涂层呈典型的扁片层状结构,片层中存在柱状晶组织,层与层之间结合紧密,α-Al2O3夹在片层间.涂层内的孔洞残留存空气,涂层的显微硬度大,涂层/基体界面咬合紧密,结合力强.
Detonation gun spraying (DS) was used to deposit NiCrAlTaY oxidation resistant coating on a single crystal Ni-base superalloy. A fundamental study was carried out on the microstructure, surface hardness and adhesion strength of DS NiCrAlTaY coating by means of XRD, SEM and EDS. The experimental results show the DS NiCrAlTaY coating composes of gamma - Ni, gamma' - Ni3Al, beta - NiAl and the oxidation product alpha - Al2O3 during spraying, which disperses on the splat boundaries. Columnar crystal structure is formed in the splats under the large thermal gradient. Porosity of the as-sprayed coating contains the residual,air. Both the hardness and adhesion strength of DS NiCrAlY coating are high.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第2期185-188,共4页
Acta Metallurgica Sinica
