稀土氧化物对β-SiAlON陶瓷的致密化和力学性能的影响

Effect of Rare Earth Oxides on Densification and Mechanical Properties in β-SiAION Ceramics

在Dy-β-SiAlON组份中，分别以Sm3+和Y3+部分取代Dy3+，观察混合稀土添加剂对致密化行为、显微结构和力学性能的影响．研究结果表明，以Sm3+取代Dy3+有助于材料的致密化和力学性能的提高，而以Y3+取代Dy3+则没有明显的效果．研究中还发现，稀土元素Sm3+的加入，有助于抑制β’晶粒生长．

The effects of mixed rare earth oxides on densification, microstructure and mechanical properties Dy-β-SiAlON ceramics were investigated. It was found that the densities and mechanical properties were improved while Dy'+ was half replaced by Sm3+, but there was no such effect found while replaced by Y3+. It was also observed that the growth of β-SiAlON grains was restrained while Sm2O3 was added.