AgSnO_2电触头材料的二步烧结工艺

Two-Step Sintering Process of AgSnO_2 Electric Contact Materials

研究了AgSnO_2电触头材料的二步烧结工艺。通过讨论预烧温度、预烧时间和升温速率对AgSnO_2电触头材料性能的影响,确定了最佳的预烧温度为700℃、时间为0.5 h,最佳升温速率是预烧前15 K/min,预烧后3 K/min。对二步烧结工艺与常用一次烧结工艺制备的AgSnO_2电触头材料的性能与显微组织进行了比较。结果表明:二步烧结工艺提高了AgSnO_2粉体烧结活性,促进了粉末在高温烧结阶段的致密化,最终大大改善了AgSnO_2烧结坯的显微组织,提高了其性能。

The two-step sintering processing of AgSnO2 electric contact materials was studied. By the discussion for the effect of pre-sintering temperature, pre-sintering time and heating rate on the properties of AgSnO2 electric contact materials, we confirm that the optimal pre-sintering temperature and pre-sintering time are 700 °C for 0.5 h and the best heating rate are 15 K/min before pre-sintering and 3 K/min after pre-sintering. The comparative study on properties and microstructures of AgSnO2 electric contact materials prepared by the two-step sintering process and the traditional one-step sintering process was carried out. The results indicate that two-step sintering process increases the sintering activity of AgSnO2 powder and promotes its densification in the high-temperature-sintering stage, which eventually improves the microstructure and performance of AgSnO2 electric contact materials.