BaTiO_3基PTCR瓷的关键原料TiO_2的化学组成和显微结构对PTC性能影响

Influence of Chemical Compositions and Microstructure of Key Raw Material TiO 2 for BaTiO 3 Based PTCR Ceramics on PTC Properties

本文对不同种类ＴｉＯ２原料（中国和日本）的化学组成（不同种类微量杂质及其含量）和显微结构（所属晶型颗粒形貌和颗粒尺寸分布曲线）进行了分析。上海东升厂的ＴｉＯ２原料与日本的所含微量杂质种类和含量相接近。它们属于金红石晶型，具有规则的颗粒形貌，颗粒大小在１μｍ左右，制得的ＰＴＣＲ瓷具有良好的ＰＴＣ性能。

Chemical compositions and microstructure of various TiO 2 materials made in China and Japan have been analysed. The chemical composition of TiO 2 made in Donsheng Factory of China approaches the TiO 2 from Japan. It is of rutile crystal type and has regular morphology of grains, the size of which is about 1μm. The results show that PTCR ceramics made from this kind of raw material have higher performance.