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Preparation and properties of YAG@TiC-ZrO2 conductive composite ceramic with a network structure
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.jallcom.2024.178222 Zhaobo Qin, YiYang Liu, Zhongbin Ma, Jiaxing Li, Hongqiang Ru, Xinyan Yue
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.jallcom.2024.178222 Zhaobo Qin, YiYang Liu, Zhongbin Ma, Jiaxing Li, Hongqiang Ru, Xinyan Yue
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The titanium carbide-zirconia (TiC-ZrO2) composite ceramics are good room-temperature electrical conductors and possess excellent mechanical properties. However, the low-temperature pressureless sintering of the conductor phase TiC remains challenging. To achieve the pressureless sintering of TiC at low temperatures, this study employed an aluminium nitrate-yttrium nitrate (Al(NO3)3-Y(NO3)3) co-precipitation coating treatment to form a layer of liquid phase sintering aid yttrium aluminum garnet (YAG) on the surface of TiC powder. Based on the YAG-coated TiC (YAG@TiC), the YAG@TiC-ZrO2 conductive composite ceramic with a network structure was prepared. The research showed that the coating treatment forms a structurally complete aluminium hydroxide-yttrium hydroxide (Al(OH)3-Y(OH)3) coating layer through heterogeneous precipitation. The coating layer transformed into YAG upon calcination. The coating treatment effectively improved the sintering performance of TiC, and enhanced the fracture toughness of the YAG@TiC-ZrO2 conductive composite with network structure. Meanwhile, the coating treatment also reduced the TiC content required to form an interconnected conductive network in the composite. The conductive percolation threshold of the YAG@TiC-ZrO2 composite was less than 6.6 vol. %. When the volume percentage of the TiC phase was 14.8, the resistivity of the composite reached 1.5 × 10-6 Ω∙m at room temperature. The electric resistance of the YAG@TiC-ZrO2 composites mainly originated from the grain boundary effect, and the resistance of the grain boundaries gradually decreased as the TiC content increased. At a TiC content of 14.8 vol. %, the volt-ampere characteristic curve of the YAG@TiC-ZrO2 composite was close to a straight line.
更新日期：2024-12-20
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