摘要
实验选取高岭土作为陶瓷基体，以不同含量的鳞片石墨和碳化硅作为导电原料，充分利用炭材料优异的导电、导热性及耐高温性能和陶瓷材料优异的抗氧化性及机械强度，经混合、模压成型和烧结工艺制备出炭／陶复合电热材料。采用XRD和SEM对其物相组成和微观形貌进行分析表征，并对其通电发热性能以及抗氧化性能等进行了测试。研究了石墨以及碳化硅的含量对复合材料电热性能的影响，并对电热机理进行了初步的分析研究。本研究所制备的炭／陶复合材料具有优异的电热性能，在低电压下（10V）即可迅速升温，并在较高温度下保持相对稳定。研制的样品中最高发热温度可达631℃。通过将炭材料和陶瓷材料复合，可有效改善炭材料的抗氧化性，使其氧化失重温度升高200℃左右。
The carbon/ceramic composites, which combine superior electrical conductivity, heat conductivity, thermal stability of carbon materials, superior anti-oxidizability, and mechanical strength of ceramic materials, were prepared by blending, ball milling, die forming, and non - oxidizing sintering of raw materials, which include ceramic matrix of natural plastic ceramic materials of kaolinite and flake graphite with different contents and SiC as conductive components.The phase and micromorphology of the carbon/ceramic composites were characterized and analyzed by XRD and SEM.Their electrothermal property and antioxidation were tested.The effects of graphite and SiC contents as well as the electrothermal mechanism on performance of the carbon/ceramic composites were done.Carbon/ceramic composites prepared possess superior electric heating property, which shows a rapid increase and then a relative stability in temperature only at a low-voltage of 10V. Its best performance could rise to 631℃ .By combining carbon materials and ceramic materials, oxidation- resistance of carbon materials can be improved effectively, which rises its weight losing temperature up to 200℃ .
出处
《炭素》
2010年第3期6-11,共6页
Carbon
基金
国家自然科学基金项目（50772034）
关键词
高岭土
碳化硅
石墨
炭/陶复合电热材料
电热性能
抗氧化性
kaolinite
SiC
graphite
electric heating carbon/ceramic composites
electrothermal property
antioxidation
