( 中南大學 粉末冶金國家重點實驗室， 長沙 410083)
摘 要: 采用粉末冶金技術研制了一種新型無銀觸頭材料，該材料的綜合性能， 如密度、 硬度、 電阻率、 滅弧特性及溫度特性與銀氧化物觸頭材料接近。 當新型無銀觸頭材料的相對密度與銀氧化物觸頭材料的相對密度相同時， 兩者電阻率相當，而其硬度高于銀氧化物觸頭材料的； 溫升和通斷能力試驗結果表明： 所研制的無銀觸頭在許多應用領域中， 如在電力機車上可替代銀氧化物觸頭材料。 實驗表明： 該材料的相對密度大于98%， 硬度(HB)大于950MPa， 電阻率小于2.78μΩ·cm。
關鍵字: 無銀觸頭； 銀基觸頭； 特性； 性能
（ State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract: A new type of silver-free contact material was prepared by P/M technology. The properties of the material, such as density, hardness, resistivity, arc resistance and temperature characteristics, are all similar to those of the silver oxidization contact materials. The relative density and resistivity of the silver-free contact material are similar to those of the silver oxidization contact material, but the hardness of the silver-free contact material is higher than that of the silver oxidization contact material. The results of the temperature-rise test and the turn-on and turn-off ability indicate that this new material can replace silver oxidization contact materials in many applications such as in electric locomotive. The results show that the materials relative density is more than 98%, the hardness(HB) is larger than 950MPa, and the electric resistivity less than 2.78μΩ·cm.
Key words: silver-free contact; silver contact materials; characteristic properties
