冷喷涂制备纳米结构FeAl金属间化合物涂层
Fabrication of Nano-structure FeAl Intermetallic Compound Coating by Cold Spraying
王洪涛, 纪岗昌, 王若宇, 崔一博
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作者单位：(九江学院 机械与材料工程学院 九江市绿色制造重点实验室, 江西 九江 332005)
中文关键字：冷喷涂； FeAl； 纳米结构； 机械合金化； 热处理
英文关键字：cold spraying; FeAl; nano-structure; mechanical alloying; heat treatment
中文摘要：利用机械合金化制备纳米结构FeAl固溶体合金粉末，采用冷喷涂沉积Fe(Al)固溶体合金涂层并结合后热处理原位反应制备了纳米结构FeAl金属间化合物涂层。通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)等研究了机械合金化Fe(Al)固溶体合金粉末、喷涂态Fe(Al)合金及热处理后FeAl金属间化合物涂层的组织结构特征。结果表明，球磨Fe(Al)合金粉末具有精细的层状结构， 喷涂态Fe(Al)合金涂层具有不同于传统热喷涂涂层的独特层状结构，保留了与原始粉末类似的纳米结构；在500 ℃热处理后涂层中Fe(Al)固溶体转变为FeAl金属间化合物，其晶粒尺寸约为30 nm。
英文摘要：The nano-structure FeAl solid solution alloy powder was prepared using mechanically alloyed and assisted with post-heat treatment. Nano-structure FeAl intermetallic compound coating was in-situ prepared by cold spraying. The microstructure of mechanically alloyed Fe(Al) solid solution alloy powder, the as-sprayed coating and as-annealed coating were characterized by SEM, TEM and XRD. The results show that the milled Fe(Al) alloy powder exhibits lamellar microstructure and the cold spraying can completely transplant the structure of the milled powder to the coating. The Fe(Al) as-sprayed coating exhibites unique lamellar microstructure and is different from that of the conventional thermal spraying coating. The Fe(Al) solid solution transforms to FeAl intermetallic compound with the grain size about 30 nm after annealing at 500 ℃.