Patent ID: 7473296
Filing Date: 2009-01-06
Classification: B22F,C22C,Y10T

Abstract:
1. A wear-resistant sintered contact material wherein at least Cr 7 C 3 -type and/or M 6 C-type carbides which have an average particle diameter of 5 μm or more are precipitately dispersed in an amount of 20 to 50% by volume within an iron-based martensite parent phase which has a hardness of HRC 50 or more even when tempered at up to 600° C., which is sinter-bonded to an iron-based backing metal having such a shape that the upper or lower surface and inner circumferential surface of the wear-resistant iron-based sintered contact material having a cylindrical disk shape can be bonded to the backing metal, and wherein one or more gas vent lines and/or gas vent holes are formed in the wear-resistant sintered contact material and/or the iron-based backing metal, and wherein after an organic lubricant is added in an amount of 2.5 to 5 wt % of the amount of a mixed powder to be sintered, the mixed powder is heat-blended at a temperature of 60 to 150° C. and granulated to form particles having a size of 2 mm or less, and these particles are mechanically pressed under a pressure of 0.4 to 3.5 ton/cm