| PTCR纳米陶瓷粉及其烧结体的制备 |
| Preparation of PTCR Nanosized Ceramic Powder and Its Sintering Materials |
| 作者 | 单位 | | 李东升 | 陕西省物理无机化学重点实验室,西北大学化学系,西安 710069
陕西省化学反应工程重点实验室,延安大学化学化工学院,延安 716000 | | 畅柱国 | 陕西省物理无机化学重点实验室,西北大学化学系,西安 710069 | | 吴淑荣 | 陕西省物理无机化学重点实验室,西北大学化学系,西安 710069 | | 熊为淼 | 陕西省物理无机化学重点实验室,西北大学化学系,西安 710069 | | 王尧宇 | 陕西省物理无机化学重点实验室,西北大学化学系,西安 710069 |
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| 摘要: |
| 关键词: PTCR纳米粉 Sol-Gel法 陶瓷粉体 烧结工艺 陶瓷材料 |
| 基金项目: |
| Abstract: The PTCR(positive temperature coefficient of resistance) nanosized ceramic powder was prepared by Sol-Gel process and characterized by XRD, DSC, SEM and BET techniques. The results showed that the nanopowder has an average crystallite size of 35nm with sphere-shaped, whose specific surface area is 27.80m2·g-1 and the crystal structure is abnormal cubical perovskite phase at room temperature. In addition, the nanopowder was pressed into pellets and then sintered according to improved technique which was built based on the data of thermal analysis of the PTCR green-compact to yield PTCR ceramic materials with peculiar microstructure and higher properties, which has a resistivity at room temperature of ～20Ω·cm, a temperature coefficient of resistivity of ～19%·℃-1, a withstand voltage intensity of >160V·mm-1 and a resistivity jump of >105. |
| Keywords: PTCR nanopowder Sol-Gel method ceramic powder sintering process ceramic material |
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| 李东升,畅柱国,吴淑荣,熊为淼,王尧宇.PTCR纳米陶瓷粉及其烧结体的制备[J].无机化学学报,2003,19(9):971-974. |
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