热压烧结对Co－Mn－Ni－O热敏材料电性能的影响

Effect of Hot Press Sintering of Co Mn Ni O System Thermosensitive Materials on Their Electric Praperties

研究了不同热压压力、热压方式对Ｃｏ－Ｍｎ－Ｎｉ－Ｏ热敏材料电性能的影响。热压烧结能够提高材料的电阻率及Ｂ值。Ｘ射线衍射分析表明，热压烧结材料有ＭｎＣｏ２Ｏ４、ＮｉＭｎ２Ｏ４和ＣｏＮｉＯ２三相组成。从扫描电镜照片可见，热压烧结材料晶粒细小、均匀、气孔率少，是提高其电性能的主要原因。

Effect of different hot press pressures and methods on electric properties of Co Mn Ni O system thermosensitive materials is reseached. Resistivity and B value of these materials can be increased through hot press sintering. X ray diffraction analysis shows that hot press sintered materials consist of three phases: MnCo 2O 4,NiMn 2O 4 and CoNiO 2.As viewed from SEM micrograph the hot press sintered materials have fine and uniform grains and a few porosity which are main factors to improve electric properties of the materials. These properties can be effectively controlled through adjustment of hot press pressure.