Ag-4wt%TiB_2复合材料复压复烧工艺

Recompacting and Resintering Process of Ag-4wt%TiB_2 Electrical Contact Material

采用粉末冶金法制备了Ag-4%TiB2复合材料,研究了复压复烧工艺对Ag-4%TiB2复合材料组织和性能的影响。结果表明:复压复烧可改善第二相增强颗粒在基体银中的分布,使组织更加致密。随着保压时间的延长,Ag-4%TiB2复合材料的致密度、硬度和导电率呈先上升后下降的趋势;保压120s时,该复合材料的致密度、硬度和导电率达到最大值,分别为85%、115HB和50%IACS。与未复压复烧相比,Ag-4%TiB2复合材料的致密度、硬度和导电率分别提高了5.6%、6.48%和11.53%。

Ag-4%TiB2 composite was prepared by powder metallurgy technique,and the effects of recompacting and resintering process on the microstructure and properties of the composite were studied.The results show that the recompacting and resintering technique can improve the distribution of second phase particles in the matrix silver,and the composite can be more dense.The density,hardness and electric conductivity of the composite first increase and then decrease with the increase of pressure holding time.When the holding time is 120 s,the density,hardness and electric conductivity of the composite reach the maximum values of 85%,115 HB and 50%IACS,respectively.Compared with Ag-4% TiB2 composite without recompacting and resintering process,the density,hardness and electric conductivity of recompacted-resintered Ag-4%TiB2 composite increases by 5.6%,6.48% and 11.53%,respectively.