钛表面改性Al/NiCu组合涂层反应机理及抗氧化性能

采用等离子结合电弧喷涂的工艺方法在工业纯钛表面制备了Al/NiCu组合涂层,在700℃的大气环境下对Al/NiCu/Ti试件进行加热处理,使得Al、NiCu复合涂层之间发生扩散反应并原位生成具有一定抗高温氧化性能的Ni-Al金属间化合物涂层.对加热改性处理前后涂层的微观组织及Ni-Al金属间化合物的形成机理进行了研究,...

Numerical Simulation and Experimental Study of Extrusion Forming of Ti-B25 Titanium Alloy Pipe

The Al/NiCu composite coatings were deposited on the surface of a pure Ti substrate by plasma spray technology and arc spray technology,and then the sprayed Al/NiCu/Ti specimen was then heated in the furnace at 700℃.A Ni-Al intermetallic compound protective coating with oxidation resistance formed through in-situ reaction between Al and NiCu composite coatings.The microstructure of the coatings before and after heat modification treatment and the formation mechanism of Ni-Al intermetallic compounds were studied.In addition,the oxidation tests of the Al/NiCu/Ti specimen(after heating and polishing treatment)and the uncoated Ti at 800℃for 100 h were conducted.The results show that,by modifying Al/NiCu spray coatings on Ti substrate with furnace heating treatment at 700℃,NiAl 3,CuAl 2,Ni 2 Al 3 and NiAl intermetallic compounds with certain Cu elements form through in-situ reaction between Al/NiCu composite coatings.However,only the NiAl intermetallic compound with high melting point can stay stable,and this intermetallic compound can protect Ti substrate under high temperature.