论文部分内容阅读
采用固相反应法合成La1-xSrxMnO3粉末,通过丝网印刷在95氧化铝瓷基板上,经1100~1300℃烧制成陶瓷厚膜。通过X射线衍射测试了粉体的晶相组成;采用扫描电镜观测了膜层的显微结构;测试了膜体的电热性能。研究结果表明:LSM膜体具有明显的负温特性;膜体经1200℃烧成具有最佳的电导率和最高的表面发热量;当LSM膜的烧结温度高于1300℃时,膜体的导电性能降低;通过调节工作电压或者改变膜体电阻可以有效的控制膜体的电热性能。
The La1-xSrxMnO3 powder was synthesized by the solid-state reaction method and was screen printed on a 95 alumina ceramic substrate and fired at 1100-1300 ° C into a ceramic thick film. The crystal phase composition of the powder was tested by X-ray diffraction. The microstructure of the film was observed by scanning electron microscopy. The electrothermal properties of the film were tested. The results show that the LSM film possesses obvious negative temperature characteristics. The film has the best conductivity and the highest surface calorific value after being sintered at 1200 ℃. When the sintering temperature of the LSM film is higher than 1300 ℃, Reduce the performance; by adjusting the working voltage or change the membrane resistance can effectively control the electrothermal performance of the membrane.