Affiliation:
1. School of Materials Science and Engineering Wuhan University of Technology Wuhan China
2. New Tobacco Products Engineering Center Tobacco Hubei Industrial Co., Ltd. Wuhan China
Abstract
AbstractVarious amounts of TiSi2 (30, 40, and 50 wt.%) were added to 3 mol% yttria stabilized tetragonal zirconia polycrystals (3Y‐TZP) to fabricate 3Y‐TZP/TiSi2 composites by vacuum sintering. The effects of the TiSi2 added amount, as well as the sintering temperature on the microstructure, mechanical, and electrical characteristics of the 3Y‐TZP/TiSi2 composites were examined. The sintered samples consisted of three phases: tetragonal (t‐ZrO2), TiSi2, and reaction product Ti5Si3. The maximum bending strength and relative density of the composites, reaching 501.20 MPa and 98.59% respectively, were achieved at a TiSi2 content of 30 wt.% and sintering temperature of 1500°C. The resistivity of 3Y‐TZP/TiSi2 composites showed a nonlinear decrease with increasing TiSi2 content. These results indicated that 3Y‐TZP/TiSi2 composites had a typical percolation threshold phenomenon due to the different TiSi2 content and a conductivity model of 3Y‐TZP/TiSi2 composites at room temperature was founded on the generalized effective medium equation. The resistivity of the composites could optionally adjust between 102 and 10−4Ω·cm with 30–50 wt.% TiSi2 under room temperature. Overall, the 3Y‐TZP/TiSi2 composites show great potential for applications in the heat‐not‐burn tobacco field.