Abstract
During sintering of hard-pressed components from copper and lead powder mixtures, sweating of lead occurs at the moment of its melting under the action of expelling capillary force. Lead oxides hinder wetting. The exuded lead reinfiltration process begins after removal of the lead oxides and changes in the wetting behavior. Addition of chromium significantly intensifies the reverse suction of the liquid phase. By sintering in argon it proceeds considerably faster than during sintering in hydrogen due to a better wetting of copper with molten lead in argon. By sintering in argon hard-pressed components made from a powder mixture of copper and lead with an admixture of chromium it is possible to obtain samples with little porosity without traces of lead on the surface.
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