热处理对MOA用ZnO电阻片电气性能的影响

采取提高热处理温度、延长保温时间等措施,改善直径大且厚的电阻片老化性能,取得了较好的效果。试验证明,热处理工艺可使电阻片的压比明显降低;在0.75U1mA下的阻性电流除少数外均有不同程度的增大,总的规律是尺寸大的比小的增大得多;热处理可明显提高电阻片的方波通流能力,并改善其稳定性。欲通过热处理使电阻片的性能获得最佳,必须根据电阻片的尺寸、烧成制度等调试热处理炉的温度制度及装片密度,选定较合理的工艺。采用再次热处理的方法使已抽查试验的电阻片性能得到恢复。通过X衍射试验,从微观上探讨了热处理改善ZnO陶瓷电气性能的原因。

Impact of Heat-treatment on Electrical Performance of ZnO Resistor for MOA

Good results have been achieved for improving ageing performance of ZnO resistor of large diameter and height through enhancing heat-treatment temperature and maintaining duration. Test proved that heat-treatment makes apparent reduction of voltage ratio of resistor and certain increase of resistive current at 0.75 U1mA beside a few exceptions. For resistor of large dimension, the increasement appear to be more than that of smaller dimension. The heat-treatment may also apparently increase the discharge capacity of resistor at rect-angular surges and its stability. For optimizing the resistor performance it is essential the heating procedure and loading density in heating oven in accordance with resistor dimension and its sintering procedure. Restoration of performance of tested resistor may be obtained using secondary heat-treatment procedure. The mechanism of electrical performance improvement of ZnO ceramics though heat-treatment is approached.