【摘要】 铝、钢双金属复合材料低电阻铝端环电枢用于新型滑差电磁调速电机,可使其转速增加,效率提高,电机体积缩小,自重减轻,材料节省,达到高速、轻型、高效率。采用钢基表面热渗铝后浇注纯铝的方法使铝、钢熔合,工艺可靠,结合牢固,研究了渗铝温度和时间对铝、钢结合强度的影响,本试验中的主要强度指标已达到:σ_b～2.5Kg/mm²,τ_max～6.6kg/mm²。用光学显微镜,扫描电镜和电子探针观察和检验了熔合界面的微观结构。铝、钢熔合过程符合反应扩散的规律。反应扩散层为金属间化合物Fe₂Al₂。硅对铁和铝之问的扩散有阻碍作用,钢基表面电镀元素Cu、Cr 和Ni 对铝、钢的结合强度的影响不明显。更多还原

【Abstract】 The low resistance aluminium top ring armature called aluminium-steel bimetal composite material is mainly applied in the new type of electro-magnetic slip speed control motor.It canincrease the motor speed or decrease the slip frequency,increase the efficiency,decrease both ofvolume and weight of motor itself,and save the raw material for manufacturing motor.Consequently,It makes the speed control motor light duty,high speed and high efficiency.First the steel was immersed into the liquid aluminium bath,after the surface of steel waspenetrated with aluminium,put it into the metallic mould,then pour pure liquid aluminium on thepenetrated surface,thus the aluminium and steel would be made metallurgical Combining.Thistechnology is reliable and the combining is secure.The effects of penetrating temperature and time on the combining strength have been investigated,and the microstructures in the interface are also examined by using optical microscope,SEM andelectron microprobe.In this work,the combining trength can reach 2.gkg/mm^?and the τ_m?is about 6.6kg/mm²。The combining process of aluminium and steel obeys the laws of reacting diffusion.The structureof reacting diffusion layer is metallic compound Fe₂Al,.The silicon obstructs the diffusion betweniron and aluminlum The surface of steel electroplated with copper,chromium,or nickel has littleinfluence on the combining strength between aluminium and steel.更多还原