Al_2O_3-WO_3二元系线性热敏材料研究

Investigation on Linear Thermosensitive Materials of Al 2O 3 WO 3 System

利用激光烧结工艺合成了Ａｌ２Ｏ３－ＷＯ３系列ＮＴＣ热敏陶瓷材料．研究发现，这种陶瓷材料在一定的组分范围和工艺条件下，在较宽的温区内，其阻温特性呈现良好的线性关系．Ｘ－ｒａｙ衍射分析表明，经激光烧结的ＮＴＣ热敏材料中含有Ａｌ２Ｏ３，Ａｌ２（ＷＯ４）３和ＡｌｘＷＯ３相，且此材料中的导电相为钨青铜结构的ＡｌｘＷＯ３．ＡｌｘＷＯ３相是在Ａｌ２Ｏ３－ＷＯ３二元系平衡相图中所没有的．

Ceramic materials of Al 2O 3 WO 3 system were synthesized by laser sintering technology. The experiments showed that the linearity resistance in some samples decreased with increasing temperature in a wide temperature rang. The X ray diffraction indicated that Al 2O 3,Al 2 (WO 4) 3 and Al x WO 3 phases exist in the materials by laser sintering. The conducting phase is Al x WO 3 tungsten bronze that does not exist in Al 2O 3 WO 3 equilibrium phase diagram.