Fe高温浸渗法制备防静电3Y-TZP陶瓷及其性能研究

以3Y-TZP陶瓷为基体, 采用还原Fe粉包埋、高温浸渗的表面改性方法, 制备防静电性能与力学性能兼备的ZrO₂陶瓷。研究了浸渗时间、浸渗温度对ZrO₂陶瓷表面电阻率及硬度的影响, 结果表明：随着浸渗时间延长, 浸渗温度升高, 表面电阻率降低, 硬度下降。在1000℃浸渗4 h, ZrO₂防静电陶瓷表面电阻率由10¹⁴ ?/□以上降低至8.3×10⁷ ?/□, 硬度由12.7 GPa降低至11.23 GPa。采用XRD、SEM、XPS等方法对防静电ZrO₂陶瓷的显微结构、化学组成及防静电机理进行了分析。结果表明, 浸渗过程中, 发生由t-ZrO₂转变为m-ZrO₂相变; Fe元素以Fe₃O₄、FeO、单质Fe的形式存在晶界处, 从而使ZrO₂陶瓷具备了防静电性能。

Preparation of Antistatic Ceramics Employing Fe-infiltration in Sintered Zirconia Body

Antistatic ceramic with good mechanical performance has wide application in fields of aerospace, petrochemical engineering, electronics and textile. Antistatic ceramic ZrO₂ was fabricated via an innovative surface modification method based on embedding Fe-infiltration into the 3Y-TZP ceramic at high temperature, which showed good antistatic and mechanical properties. In addition, microstructure and morphology of as-prepared samples were characterized by XRD, SEM and XPS. Furthermore, the antistatic mechanism of ZrO₂ ceramics was investigated. The effects of infiltration temperature and infiltration time on vickers hardness and surface resistivity of specimen were evaluated. Experimental results showed that the surface resistivity and hardness decreased with the increase of infiltration temperature and infiltration time, in which the surface resistivity decreased from more than 10¹⁴ ?/□ to 8.3×10⁷ ?/□, and the hardness of ZrO₂ ceramics decreased from 12.7 GPa to 11.23 GPa after infiltration at 1000℃ for 4 h. Analysis results indicated that there was a phase transformation of ZrO₂ from t-ZrO₂ to m-ZrO₂ in the infiltration process. It was also found that Fe, Fe₃O₄ and FeO located in the interface of infiltration layer, which were attributed to the antistatic property of ZrO₂ ceramics.