材料科学
碳热反应
多孔性
化学工程
炭黑
陶瓷
复合材料
复合数
碳纤维
天然橡胶
碳化物
工程类
作者
Shijie Wang,Haonan Chen,Yong Li,Haoxuan Ma,Xinhong Liu,Shaowei Zhang,Quanli Jia
标识
DOI:10.1016/j.jeurceramsoc.2023.02.070
摘要
In this work, pure ZrB2-SiC composite powders were obtained using ZrO2, SiO2, B4C and carbon black as raw materials via a boro/carbothermal reduction (BCTR) reaction process at 1500 °C for 2 h in vacuum condition. Based on this finding, porous ZrB2-SiC ceramics were in-situ synthesized via a novel and facile boro/carbothermal reaction process templated pore-forming (BCTR-TPF) method. The phase composition, linear shrinkage, and pore size distribution were also methodically studied. Results show that the porous ZrB2-SiC ceramics with controllable porosity of 67–78%, compressive strength of 0.2–9.8 MPa and thermal conductivity of 1.9–7.0 W·m−1K−1 can be fabricated by varying of ZrO2 and B4C particle sizes. The formation of ZrB2 grains was controlled via solid-solid and solid-liquid-solid growth mechanisms, the growth process of SiC grains was mainly regulated by solid-solid, vapor-vapor and vapor-solid growth mechanisms during the overall synthesis process. Finally, the pore-forming mechanism of porous samples prepared via the BCTR-TPF method was gases combined with template pore-forming mechanism, i.e., B4C and carbon black acted as pore-forming templates, and gaseous products generated in the BCTR reaction were also applied as gas pore-forming agent.
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