在研制换向器材料时,为了确保可靠的滑动接触,力求换向片具有下列性能:(1)在工作温度下有较稳定的接触特性;(2)在给定的工作条件(介质、温度、滑动速度)下,有良好的抗摩性;(3)导热率高;(4)有足够的机械强度、耐热性和可塑性;(5)运行中换向片间的间隙不发生遮蔽现象。为达到上述目的广泛采用 M_1号铜材。铜条原料供货时硬度不小于80HB,但是在 In the development of commutator materials, in order to ensure reliable sliding contact, and strive to have the following properties: (1) at work temperature has a more stable contact characteristics; (2) given the working conditions (medium, temperature , Sliding speed), good anti-friction; (3) high thermal conductivity; (4) sufficient mechanical strength, heat resistance and plasticity; (5) the operation of the gap between the commutator does not occlude the phenomenon . To achieve the above purpose widely used M_1 copper. Copper bar when the supply hardness of not less than 80HB, but in