Densification and microstructure evolution of W-TiC-Y2O3 during spark plasma sintering

作者：Zhou, Yu-Fen; Zhao, Zhi-Yuan; Tan, Xiao-Yue; Luo, Lai-Ma^*; Xu, Yue; Zan, Xiang; Xu, Qiu; Tokunaga, Kazutoshi; Zhu, Xiao-Yong; Wu, Yu-Cheng^*

来源：International Journal of Refractory Metals and Hard Materials, 2019, 79: 95-101.

DOI：10.1016/j.ijrmhm.2018.11.014

• Spark plasma sintering (SPS)
• W-TiC-Y2O3 composite
• Densification process
• Surface diffusion
• Grain boundary diffusion

Spark plasma sintering (SPS) is one of the methods used to achieve the low-temperature densification of refractory metal materials. In this study, powder prepared through a wet chemical method was consolidated via SPS at 1100 degrees C, 1200 degrees C, 1350 degrees C, 1600 degrees C, and 1800 degrees C to obtain a high-performance W-TiC-Y2O3 composite material. Densification was studied by analyzing the densification curve and changes in the microstructure of the samples. This process could be divided into three stages: the bonding stage, the sintering neck growth stage, and the shrinkage and spherification stage of closed pores. Surface diffusion and grain boundary diffusion played different roles in densification. The density, grain size, and Vickers hardness of the tungsten material increased significantly as temperature increased. This study evaluated the sintering process and provided a basis for obtaining high-performance tungsten materials through SPS.

• 出版日期2019-2
• 单位合肥工业大学