The Investigation Of Manufacture And Property For W-Cu Electrical Contact Material

The powder metallurgy process parameters, alloy component, doping of W-Cu contact material was studied in this paper. And the material was test in electrical wear to investigate the electrical wear resistance property and the electrical wear mechanism.By measuring the static performance and electrical wear extent test and using SEM and EDS analysis methods, the influence of different preparation technology and alloy component was studied scientific. The results show that:The proper manufactured process of infiltration sintering W-Cu alloy was wet milling18hâ†'hot-pressing sintering900℃×1minâ†'infiltrationâ†'repress90KN. The alloy relative density can reach95.6%. The alloy property can be improved by adding Ni or Nb. The relative density can averagely raise1.735%and hardness can averagely raise56.25HB by adding Nb. They can averagely raise1.735%and hardness can averagely raise56.25HB by adding Nb. The best effect is adding6%Nb or2%Ni. The best electrical wear resistance is W-Cu30and the worst is W-Cu20, which wear loss is twice of W-Cu30. The electrical wear resistance of W-Cu50and W-Cu40are between the two. The difference between electrical mechanisms is the main reason that makes their electrical wear resistance different. The W-Cu50electrical wear mechanism is that Cu largely wears under electrical arc activity, which caused crack in two phase junctions and extend to Cu enrichment region. The mechanism of W-Cu40is that Cu phase wear under electrical arc and W phase constituted part skeleton to inhibit electrical arc activity. The electrical wear mechanism of W-Cu30is uniform skeleton W phase inhibit arc-work phases solidify in-situ Cu phase lose heat adequately to deduce wear loss. W-Cu20has two kinds of mechanism. One is plenty of Cu lose and W form solidified layer. The other one is Cu phase loses and W phase skeleton is stripped under arc-work to form porous morphology.