降温速度及气氛对PTC元件特性之影响

Influence of Cooling Speed and Atmosphere in Firing Process of PTC Thermistor on Their Performance

通过工艺试验，研究了ＢａＴｉＯ３陶瓷ＰＴＣ材料在烧成过程中的冷却速度及烧成气氛对其ＰＴＣ特性之影响。试验结果表明：采用适当的缓冷速度及氧气氛烧成可大大提高材料的ＰＴＣ特性，αＴ、Ｒ（２００）／Ｒ（ｍｉｎ）明显增大，室温电阻达４５Ω左右。所制元件与日本样品性能相近，完全能满足开关型元件的要求。

Influence of cooling speed and atmosphere in firing of BaTiO3-based ceramics for PTC thermistors on their performance is researched through technological experiments. It is shown, that firing the ceramics in slow-cooling speed and oxygen atmosphere significantly improves PTC performance of thermistors: their at and R200/Rmin increase obviously, temperature resistance is reached near 45Ω approaching to ones of Japan and They fully meet requirement of switching supply components.