2（質(zhì)量分數(shù)，下同）觸頭材料，測量了Ag-4% TiB2觸頭材料的致密度、導(dǎo)電率和硬度，并在真空下對Ag-4% TiB2觸頭材料進行了電弧侵蝕實驗。采用掃描電子顯微鏡對Ag-4% TiB2觸頭材料電弧侵蝕后的表面形貌進行了表征，采用TDS-2014雙通道數(shù)字存儲示波器記錄了燃弧波形，并計算了燃弧時間，對電弧侵蝕機理進行了探討。結(jié)果表明，Ag-4% TiB2觸頭材料的致密度、導(dǎo)電率和硬度均隨著Ag粒度的降低而增加。另外，采用細銀粉制備的Ag-4% TiB2觸頭材料具有較長的燃弧時間、較大的侵蝕面積和較淺的蝕坑，表明細小的Ag顆粒有助于電弧分散，能夠提高材料的耐電弧侵蝕性能。;The Ag-TiB2 contact materials with Ag powders of different sizes were prepared by spark plasma sintering. The relative density, electroconductivity, and hardness of Ag-4wt% TiB2 contact materials were measured, and the arc erosion behavior of the contact materials was analyzed under the vacuum condition. The surface morphologies of Ag-4wt% TiB2 contact materials after arc erosion were characterized by the scanning electron microscope. The arc duration was determined by the discharged waveform recorded by a Tektronix TDS-2014 dual channel digital memory oscilloscope, and the arc erosion mechanism was discussed. The results show that the relative density, electroconductivity, and hardness of Ag-4wt% TiB2 contact materials are increased with decreasing the Ag powder size. Furthermore, the Ag-4wt% TiB2 contact materials prepared from fine Ag powder have longer arc duration, larger erosion area, and shallower erosion pit, suggesting that the fine Ag powder is beneficial for arc dispersion and the improvement in arc erosion resistance."/>
2;Ag粉粒度;電弧侵蝕;contact material;Ag-TiB2;Ag powder size;arc erosion"/>