石墨-陶瓷复合材料电热特性的研究  

Study on Electrothermal Characteristics of Graphite-ceramic Conductive Composites

作　　者：郑昕[1] 白佳海[1] 刘俊成[1] 杨东亮 

机构地区：[1]山东理工大学材料科学与工程学院,淄博255049 [2]山东皇冠新材料研究所,淄博255086

出　　处：《硅酸盐通报》2008年第5期982-985,990,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家科技型中小企业技术创新基金资助(06C26213701384)

摘　　要：利用低温快烧工艺制备石墨-陶瓷电热复合材料,首先测定材料的室温电阻率,然后在样品两端施加220V交流电,测定了材料样品表面不同点的温度变化和电流变化,探讨了材料表面温度随时间的变化规律以及材料的电阻-温度特性。结果表明:试样的升温速率与电阻率有关,电阻率越小,升温速率越快,表面发热温度越高;在通电初期,复合导电材料随温度的升高呈现明显的NTC效应。随着温度的升高,材料的电阻率迅速降低,当温度达到最高时,电阻率最小;随着通电时间的延续,温度略有降低,而电阻率有所回升。当复合材料中石墨含量减少时,NTC效应减弱直至消失。Graphite-ceramic conductive composites with different graphite content were prepared by low temperature fast sintering method. At first, the resistivity of the graphite-ceramic composites at room temperature were measured. Then the samples were charged with 220 VAC, the current through the samples and its surface temperature involution were measured. It is found that the smaller the resistivity, the faster the heating rate, and the higher the surface temperature. The NTC effect is very obvious at the initial stage when the samples were charged with electricity. As the temperature rises, the resistivity decreases acutely. When the temperature reaches its summit, the resistivity gets its minimum value. Then the resistivity increases slowly, but the temperature decreases a little.

关 键 词：复合导电材料 电阻率 表面温度 电阻-温度特性 

分 类 号：TB332[一般工业技术—材料科学与工程]