Ag/La_2NiO_4复合触点材料的制备与性能

Preparation and Performance of Ag/La_2NiO_4 Composite Contact Materials

利用传统的陶瓷制备工艺制成La2NiO4类金属导电陶瓷,将其与银粉混合制成Ag/La2NiO4复合触点材料,该材料具有电阻率较小,加工性好等特点。X射线衍射分析发现La2NiO4陶瓷在电弧烧蚀作用下相结构不发生变化,具有高的化学稳定性。模拟电寿命实验测得触点材料转移和烧蚀量小,表面抗烧蚀性好。与通用的Ag/CdO和Ag/SnO2触点材料比较,Ag/La2NiO4性能较佳,是一种可以取代Ag/CdO的新型触点材料。

The La2NiO4 metalloid conductive ceramics produced by conventional ceramic preparation technique were added into fine silver powders to form Ag/La2NiO4 composite contact materials. It is found by XRD that the phase structure of La2NiO4 ceramics did not change after arc erosion and exhibited a high chemical stability. The test results of model life and mechanical and physical properties show that the mass transfer and erosion is less and the performance of surface anti-erosion is more favorable for the contacts, resulting in the small resistivity and good mechanical properties. The Ag/La2NiO4 contacts exhibit an excellent performance compared with the Ag/CdO and Ag/SnO2 contact materials and very possible for the new type of contact materials as environmentally acceptable alternative to Ag/CdO.