烧结工艺对铜基粉末冶金摩擦材料的影响

The Effect of Sintered Process on Cu-based Powder Metallurgy Friction Materials

采用粉末冶金的方法烧结铜基摩擦材料,研究烧结温度、烧结压力、保温时间和成型压力对摩擦材料性能的影响。结果表明:随着烧结温度的升高,材料的密度、强度和硬度都降低,孔隙度增大;随着烧结压力的增大,硬度先增大后减小,压力达到20 MPa时,硬度最大;随着保温时间的延长,抗压强度增大;随着成型压力的增大,抗压强度先增大后较小,成型压力为42 MPa时,抗压强度最大。当材料的物理力学性能处于最佳范围时,材料的摩擦因数才达到最大,物理力学性能过高或过低都不利于摩擦因数的提高;对偶磨损量主要取决于摩擦材料的摩擦因数,随着摩擦因数的增大而增大。

Cu-based powder metallurgy friction materials were prepared by powder metallurgy sintered method, and the effects of sintering temperature, sintering pressure, holding time, and molding pressure on the properties of friction materials were studied. The results show that,with the increasing of sintering temperature, the density, strength and hardness of the materials are reduced, and the porosity is increased. With the increasing of the sintering pressure, the hardness is first in- creased and then decreased, which reaches the maximum at the pressure of 20 MPa. With the extension of the holding time, the compressive strength is increased. With the increasing of molding pressure, the compressive strength is first in- creased and then reduced, which reaches the maximum at the pressure of 42 MPa. Only when the physical and mechanical properties of the materials are in the optimum range ,the friction coefficient of the material reaches the maximum,too high or too low physical and mechanical properties is not conducive to the improvement of friction coefficient. With the increas- ing of friction coefficient, the wear of coupling material is increased.