含MgO-Lu_2O_3-Re_2O_3三元添加剂Si_3N_4陶瓷摩擦磨损性能的研究

Study on Wear Behavior of Si_3N_4 Ceramics Sintered with MgO-Lu_2O_3-Re_2O_3 Ternary Additives

利用球盘式摩擦磨损试验机,研究了含MgO-Lu2O3-Re2O3(La2O3,Sm2O3,Gd2O3,Er2O3)三元添加剂Si3N4陶瓷的摩擦磨损性能。结果表明:机械磨损和摩擦化学反应为主要磨损机理。在三元添加剂中,随着第二稀土离子Re3+半径的增加,粘附层增加,Si3N4摩擦系数降低。基于横向断裂理论模型,Si3N4陶瓷单位磨损率随着1/(K1/2RH5/8)的增加而增加,其中含有第二相Lu-LuS m和SN-LuE r优于此线性关系,表现出更好的)4Si2N2O7的样品SN抗磨损性能。

The wear behavior of Si3N4 ceramics sintered with MgO-Lu203-Re203 ternary additives was investigated by the friction and wear testers. The results show that the mechanical wear and tribochemieal reaction were the main wear mechanisms. With the increment of the radius of Re3＋ among the ternary additives, the adhesion layer increases and the frictional coefficient decrease. Based on the Lateral-crack chipping model, the specific wear rate increased with the increment of the （1/K 1/2/R H5/8）The sample SN-LuSm and SN-LuEr with second phase Lu4Si2N207 show better wear resistant than the liner relation.