Nd_2O_3对Al_2O_3基复合陶瓷耐磨性能及微观结构的影响

Effects of Nd_2O_3 on Wear Resistance and Micro-structure of Alumina-based Ceramics

在Ca O-Mg O-Si O2作为复合烧结助剂降低氧化铝陶瓷温度的前提下,研究不同添加量的稀土氧化物Nd2O3对陶瓷烧结温度、磨损率、显微结构的影响。通过设计Nd2O3在六铝酸钙中固溶和Nd2O3在Al2O3单晶表面扩散的实验,探索Nd2O3对氧化铝陶瓷耐磨性能影响的机理。结果表明:加入过量的Nd2O3会破坏晶界结合强度,导致陶瓷的耐磨性能变差;而少量Nd2O3的加入能有效提高晶界间结合强度和陶瓷的致密度,改善耐磨性能,耐磨性提高幅度约42.7%。

Based on a CaO-Al_2O_3-MgO-SiO_2 system can reduce the sintering temperature of alumina ceramic, the influence of Nd_2O_3 content on the sintering temperature, wear rate, and microstructure was discussed. The wear resistance mechanism were studied by two experiments including the solid solution of Nd_2O_3 in CaAl_12O_19 and the diffusion of Nd_2O_3 on the surface of Al_2O_3 crystal. The results suggest that excessive Nd_2O_3 destroys grain boundary cohesion, which makes the wear resistance of ceramic worse, while a small amount of Nd_2O_3 can increase grain boundary cohesion and the density of ceramic effectively, which can improve the wear resistance. The wear resistance of alumina ceramic increased about 42.7%.