Silver heavy rake earth metal oxide electric contact material and its preparation process

The electric contact material is made up by using silver and heavy rare earth metal oxide through a certain metallurgical process, in which the heavy rare earth metal oxide content is (wt%) 5-18%, and its preparation process adopts chemical precipitation method or ultrasonic chemical covering method to obtain silver and rare earth metal oxide composite powder, then makes the composite powder undergo the processes of press-forming, sintering, forging or extruding, multiple-dieing, and wire-drawing to obtain the contact or contact product. Said invention is reasonable in material composition, simple in technological process, low in cost and suitable for industrial production.