Preparation of halloysite-based ceramic/carbon composites by hydrothermal-hot pressing coupling method and study on properties
XU Yuan-qiang1, HE Qing1, LI Chao2, WU Xue-ping1
1. School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China; 2. Hefei Kejing Materials Technology Co., Ltd., Hefei 230088, China
Abstract: Halloysite/carbon are prepared by hydrothermal method using halloysite as template and chitosan as carbon source.By adjusting the mass ratio of halloysite to chitosan,ceramic/carbon composites are prepared by hot pressing sintering.The effects of carbon content on the density,mechanical property and electrical conductivity of composites are probed by Archimedes drainage method,three-point bending test and SEM.The results show that further carbonization occurs for the deposited carbon on halloysite surface,and halloysite transfers to mullite during hot pressing.Carbon is uniformly distributed in ceramic.With the increase of carbon content on the surface of halloysite,the generation of internal microcracks in composites increases and the flexural strength of the composites decreases gradually.Adding a small amount of carbon can improve the fracture toughness of ceramic.When the mass ratio of halloysite to chitosan is 8,the fracture toughness of the composite reaches the highest,which is 12.93% higher than that of the ceramic without carbon.When the mass ratio of halloysite to chitosan is 2,the electrical conductivity of composite achieves the highest,being 23.15 S·m-1.
徐元强, 何青, 李超, 吴雪平. 水热-热压耦合法制备陶瓷/碳复合材料及其性能研究[J]. 现代化工, 2022, 42(4): 134-139.
XU Yuan-qiang, HE Qing, LI Chao, WU Xue-ping. Preparation of halloysite-based ceramic/carbon composites by hydrothermal-hot pressing coupling method and study on properties. Modern Chemical Industry, 2022, 42(4): 134-139.
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