The invention discloses a preparation process of a
copper-based
powder contact. The preparation process comprises the following steps: S1, performing primary
powder mixing; S2, performing filtering and
drying; S3, performing primary pressing; S4, performing primary
sintering; S5, performing cooling: after the primary
sintering is finished, introducing room-temperature
rare gas into a furnace for 30-40 minutes, then changing the temperature of the
rare gas filled into the furnace, gradually reducing the temperature of the
rare gas to 20 DEG C from 100 DEG C in an equal difference manner at a difference value of 10 DEG C, maintaining the filling time of the rare gas at each
temperature gradient for 5 minutes, then taking out a blank
ingot after the primary
sintering, and cooling the blank
ingot through a cooling device; S6, performing secondary pressing; S7, carrying out secondary sintering; and S8, performing rolling, wiredrawing and blanking. The invention also discloses a
relay formed by the contact prepared by the preparation process. According to the method, the professional cooling step is added in the traditional
metal powder metallurgy process, so that the blank
ingot subjected to primary sintering can be completely cooled after the cooling step, and the blank ingot is prevented from generating cracks during secondary pressing to influence the property of the contact.