中低温烧结超高耐压钛酸钡基BCTZ陶瓷材料的研究

Investigation of ultra-high voltage barium titanate based BCTZ ceramic materials sintered at middle-low temperature

采用传统固相反应法制备出Li^+和Na^+掺杂的(Ba_(1–x)Ca_x)(Zr_yTi_(1–-y))O_3(BCTZ)介电陶瓷材料,研究了助烧剂(Li^+和Na^+)在不同预烧和烧结温度下对BCTZ陶瓷材料相结构、介电性能和耐压特性的影响。结果表明:通过Li^+和Na^+的掺杂,BCTZ陶瓷材料均为纯钙钛矿结构,Li^+掺杂BCTZ陶瓷材料的最佳预烧温度为1250℃,烧结温度为1135℃,所得材料的相对介电常数εr为1051,介质损耗tanδ为2×10^(–4),直流击穿电压V_(DC)为15.5×10~3 V/mm,交流击穿电压V_(AC)为11.0×103 V/mm;Na^+掺杂BCTZ陶瓷材料的最佳预烧温度为1120℃,烧结温度为1135℃,所得材料的εr为1063,tanδ为4×10^(–4),V_(DC)为15.2×10~3 V/mm,V_(AC)为10.1×10~3 V/mm。

The Li＋ and Na＋ doped （Ba1_xCax）（ZryTi1-y）O3 （BCTZ） ceramics were prepared by using the conventional solid-state method. The effects of the sintering aids （Li＋ and Na＋） at different presintering and sintering temperatures on phase structure, dielectric properties and voltage properties of BCTZ ceramic materials were investigated. The results indicate that BCTZ ceramics are pure perovskite structure after the modification of Li＋ and Na＋. Moreover, when the optimum presintering temperature and sintering temperature of Li＋ doped BCTZ ceramics are 1250 ℃and 1135 ℃, the relative permittivity er, dielectric loss tanS, breakdown voltage VDc and VAC of the material are found to be 1051, 2×10-4, 15.5 ×103 Wmm and 11.0x 103 Wmm, respectively. While the optimum presintefing temperature and sintering temperature of Na＋ doped BCTZ ceramics are 1120 ℃ and 1135℃, the εr, tanδ, VDC and VAC of the material are found to be 1063, 4 ×10-4, 15.2 × 103 V/mm and 10.1× 103 V/mm, respectively.