中文摘要：

采用热压法制备了不同TiB2粒度增强的Ag-4%TiB2（质里分数）触头材料,研升了TiB2粒度大小对Ag-4%TiB2触头材料组织及性能的影响。利用扫描电子显微镜和激光共聚焦显微镜对Ag-4%TiB2触头材料的组织和电弧侵蚀后的形貌进行了表征,对致密度、硬度及导电率进行了测量。结果表明：热压法有助于提高Ag-4%TiB2触头材料的致密度。随着TiB2粒径的减小,硬度先增大后减小,导电率不断增大。细小弥散分布的TiB2颗粒有助于改善耐电弧侵蚀性,侵蚀面积较大,蚀坑浅,燃弧时间短。

英文摘要：

Ag-4wt%TiB2 electrical contact materials reinforced with TiB2 particles of different sizes were prepared by hot pressing, and the effects of TiB2 particle sizes on the microstructure and properties of Ag-4wt%TiB2 electrical contact materials were studied. The microstructure and arc erosion morphology of the Ag-4wt%TiB2 electrical contact materials were characterized by a scanning electron microscope and a confocal laser scanning microscope, and the relative density, hardness and electrical conductivity were tested as well. The results show that the hot pressing favors the relative density improvement. With decrease of TiB2 particle size, the electrical conductivity constantly increases, while the hardness increases and then decreases. The fine and well distributed TiB2 particles are beneficial to increase the arc erosion resistance. The Ag-4wt%TiBz contact material presents shallow erosion pits, large erosion area, and short arcing time.