Microstructure and mechanical properties of (Ti, W)C cermets prepared by ultrafast spark plasma sintering. Issue 11 (1st June 2022)

• Record Type: Journal Article
• Authors: Wang, Zhiyong; Wang, Jianping; Xu, Yongsai; Yi, Mingdong; Xiao, Guangchun; Chen, Zhaoqiang; Zhang, Jingjie; Chen, Hui; Xu, Chonghai
• Is Part Of: Ceramics international. Volume 48:Issue 11(2022)
• Page Start: 15613
• Page End: 15621
• Publication Date: 2022-06-01
• Subjects: Spark plasma sintering -- Grain size -- Heating rate -- Mechanical properties -- Grain growth; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.02.095
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: To explore the impact of the sintering rate on the microstructure and mechanical properties of cermets, the preparation of (Ti, W)C cermets by ultrafast sintering via spark plasma sintering (SPS) is reported. Compared with a slow heating rate, the electric field produced by an ultrafast heating rate enhances the liquid phase mass transfer of the metal binder phase, thus achieving rapid densification of (Ti, W)C cermets and effectively inhibiting abnormal grain growth. However, an excessive heating rate will lead to an "overflow" phenomenon, which reduces the grain growth difficulty and the bonding strength between grains. The results show that when the heating rate is 500 °C/min, the liquid phase mass transfer is moderate, the densification degree is the highest and the mechanical properties are excellent. The flexural strength, Vickers hardness and fracture toughness are 1340.90 ± 23.55 MPa, 18.42 ± 0.46 GPa and 11.96 ± 0.23 MPa∙m 1/2, respectively.