摘要
采用 5 k W连续 CO2 激光器对经等离子喷涂的 Ni Co Cr Al Y结合层和 Zr O2 陶瓷层进行二次重熔处理 ,并利用金相显微镜、扫描电镜和电子探针对激光熔敷涂层进行了显微结构和元素分布观察与测试。结果表明 :激光熔敷涂层中基体对 Ni Co Cr Al Y合金层产生稀释 ,形成成分和组织偏析。加入了 Ti O2 - Al- Ti添加剂的 Zr O2 陶瓷层激光重熔后得到了无裂纹的定向生长柱状晶 ,并且呈现一次枝晶平均间距为 2 .3μm的表层和平均间距为 3.
A new type of thermal barrier coatings was developed for metal atomizing jet on stainless steel. The method involved precoating by a plasma-spraying and subsequent laser remelting. A 5kW CW CO2 laser was used to produce NiCoCrAlY bond coating and zirconia ceramic coating with double remelting. The results show that the NiCoCrAlY alloy coatings are diluted by the substrate, and are found chemical composition and microstructure excursion. The microstructure of ZrO2 coatings with TiO2-Al-Ti dopants is oriented columnar grains, whose space between dendrites is respectively 2.3μm of top layer and 3.8μm of subsurface layer.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2003年第1期27-29,共3页
Journal of Materials Engineering
