材料科学
氧化剂
碳热反应
热解
陶瓷
钛
电阻率和电导率
热分解
分解
碳纤维
化学工程
电导率
热导率
复合材料
冶金
碳化物
物理化学
有机化学
化学
电气工程
工程类
复合数
标识
DOI:10.1016/j.jeurceramsoc.2019.06.020
摘要
In this study, high temperature resistant Si-O-C-Ti has been successfully prepared based on the pyrolysis of polysiloxane (PSO) and titanium (IV) isopropoxide (TTIP) at 1200–1400 °C. PSO can homogeneously mix with TTIP to enhance its conversion to TiC. The carbothermal reactions between TiO2 (product of thermal decomposition of TTIP) and carbon result in the formation of TiC. All the Si-O-C-Ti composites pyrolyzed at 1200–1300 °C are stable up to 1000 °C in an oxidizing air atmosphere. TiC leads to high electrical conductivity at elevated temperatures; the maximum conductivity is 1176.55 S/m at 950 °C, which is the first reported value of >1000 S/m conductivity for Si-O-C-Ti ceramics. However, too high a pyrolysis temperature, such as 1400 °C, can potentially ‘destabilize’ the Si-O-C-Ti system by consuming the free carbon and result in lower conductivities.
科研通智能强力驱动
Strongly Powered by AbleSci AI