中文摘要：

采用激光烧结厚膜电子浆料技术．在三氧化二铝陶瓷基板上制备厚膜正温度系数（PTC）热敏电阻。研究了激光工艺参数以及后续热处理温度对PTC热敏电阻线宽、形貌和性能的影响规律。激光烧结制得的厚膜PTC热敏电阻最小线宽为40μm．电阻温度系数（TCR）可达2965×10^-6／℃，其性能与传统的炉中烧结相当。激光功率密度和后续热处理温度对PTC热敏电阻方阻和电阻温度系数影响较大，并都存在一个最佳值。

英文摘要：

Thick-film positive temperature coefficient （PTC） thermistor on Al2O3 ceramic substrate was prepared by laser sintering of thick-film electronic paste. The effects of laser processing parameters and the temperature of post heat processing on thick-film PTC thermistor width, surface microstructure and performance were studied. The minimum linewidth of thick-film PTC thermistor by laser sintering is 40 μm. The temperature coefficients of resistivity （TCR） of PTC thermistor is around 2965 ×10^-6/℃ , and the performance is equivalent to traditional oven- fired electrical paste. The laser power density and the temperature of post heat processing have great effect on the sheet resistivity and TCR of PTC thermistor, and there exist optimum values for these parameters.