航天继电器用AgCuONiO电接触材料的电寿命服役性能研究

Electrical Life Performance of AgCuONiO Electrical Contact Materials Applied in Aerospace Relay

目的 探究一种可替代AgCdO的高性能且环境友好的新型电接触材料,以提升航天继电器的可靠性。方法 在一定条件下以合金内氧化法制备AgCuONiO电接触材料,并与商用AgCdO电接触材料进行对比,利用电寿命模拟试验分析2款材料的电寿命循环服役性能,分析其失效机理。结果 AgCuONiO材料的总质量损失为0.000 88 g,平均燃弧时间、燃弧能量、熔焊力、回跳次数、回跳时间、回跳能量分别为4 222μs、694 mJ、0.049 N、1.799次、592.999μs、63.892 mJ,均大于商用AgCdO电接触材料,但其接触电阻低,且稳定,失效模式为无法分断电弧,而商用AgCdO电接触材料为粘连失效。AgCuONiO电接触材料的电寿命服役周期为44073次,是AgCdO电接触材料的3倍左右,因此可以显著提高航天继电器的可靠性。结论AgCuONiO电接触材料的一些电寿命服役性能虽然不如商用AgCdO电接触材料,但其电寿命服役周期明显强于商用Ag Cd O电接触材料,可作为替代AgCdO的较佳候选材料之一,应用于服役寿命要求更长的航天继电器。

The work aims to prepare a high-performance and environmentally friendly electrical contact material that can replace AgCdO to improve the reliability of aerospace relays.The AgCuONiO electrical contact material was prepared by the alloy internal oxidation method,and compared with the commercial AgCdO material.The electrical life simulation experiment was conducted to evaluate the electrical life performance of the two kinds of materials.The results showed that the total mass loss of the AgCuONiO material was 0.00088 g,and its average arcing time,arcing energy,welding force,bounce cycles,bounce time and bounce energy were 4222μs,694 mJ,0.049 N,1.799 times,592.999μs and 63.892 mJ respectively,which were all larger than those of the commercial AgCdO material,but its contact resistance was much lower and stabler.And its failure mode was failure of arc segmentation,while that of the commercial AgCdO electrical contact material was adhesion failure.The electrical service life of the AgCuONiO material was 44073 times,which was about triple that of the AgCdO material,so it can significantly improve the reliability of aerospace relays.Although some electrical life service performances of the Ag-CuONiO electrical contact material are not as good as those of the commercial AgCdO electrical contact material,its electrical service life is significantly stronger than that of the commercial AgCdO electrical contact material.Hence it can be used as one of the better candidate materials to replace AgCdO for aerospace relays with longer service life.