Abstract
Abstract In order to clarify the effect of TiB 2 particle size on the arc erosion behavior of Ag-TiB 2 composite, Ag-4wt%TiB 2 composite reinforced by different grain-sized TiB 2 particles was prepared by mechanical milling and powder metallurgy. The microstructures of Ag-4wt%TiB 2 composites were analyzed, and the global distribution of TiB 2 particles was quantitatively evaluated by the enumeration method. The vacuum arc erosion of Ag-4wt%TiB 2 composite was tested in a modified TDR240A single crystal furnace. The surface morphology of the Ag-4wt%TiB 2 composite after arc erosion was characterized. The mass losses before and after arc erosion were measured. 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 as well. The results show that with the decrease of TiB 2 particle size, the TiB 2 particles are more uniformly dispersed in the Ag matrix, and Ag-4wt%TiB 2 composite presents less mass loss, shorter arc duration, larger arc erosion area and shallower erosion pits. It suggests that fine TiB 2 particle can effectively improve the arc erosion resistance of the Ag-4wt%TiB 2 composite.
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