Mechanical and electrical properties of 3Y‐TZP/TiSi 2 composites sintered at different temperatures

• Published in: International journal of applied ceramic technology 2024-05, Vol.21 (3), p.2173-2182
• Main Authors: Liu, Weikang, Huang, Ting, Chen, Yucong, Huang, Yingying, Yao, Zhenhua
• Format: Article
• Language: English
• ISSN: 1546-542X; 1744-7402
• DOI: 10.1111/ijac.14676

Various amounts of TiSi 2 (30, 40, and 50 wt.%) were added to 3 mol% yttria stabilized tetragonal zirconia polycrystals (3Y‐TZP) to fabricate 3Y‐TZP/TiSi 2 composites by vacuum sintering. The effects of the TiSi 2 added amount, as well as the sintering temperature on the microstructure, mechanical, and electrical characteristics of the 3Y‐TZP/TiSi 2 composites were examined. The sintered samples consisted of three phases: tetragonal (t‐ZrO 2 ), TiSi 2 , and reaction product Ti 5 Si 3 . The maximum bending strength and relative density of the composites, reaching 501.20 MPa and 98.59% respectively, were achieved at a TiSi 2 content of 30 wt.% and sintering temperature of 1500°C. The resistivity of 3Y‐TZP/TiSi 2 composites showed a nonlinear decrease with increasing TiSi 2 content. These results indicated that 3Y‐TZP/TiSi 2 composites had a typical percolation threshold phenomenon due to the different TiSi 2 content and a conductivity model of 3Y‐TZP/TiSi 2 composites at room temperature was founded on the generalized effective medium equation. The resistivity of the composites could optionally adjust between 10 2 and 10 −4 Ω·cm with 30–50 wt.% TiSi 2 under room temperature. Overall, the 3Y‐TZP/TiSi 2 composites show great potential for applications in the heat‐not‐burn tobacco field.