Abstract
The effect of the carbon content and sintering conditions on the wear resistant properties of ferrous sintered materials were investigated in order to develop rotary engine side seal. Wear test was conducted using cast iron as the mating material. The specimens were made by pressing the mixture of reduced iron powder and natural graphite powder. The compacts were sintered in H2 at 1393 K for 1.2 ks. In the wear test, the wear amount of the couple "3mass%C specimen and cast iron disk" was minimum.
The specimen of 3 mass% C showed the brittleness, which have a Fe3C network structure and nodular α phase iron. The brittleness of this specimens was overcome changing the structures into spheroidal Fe3C and redusing a phase iron by special heat treatment. The heat treatment is that specimens were hold or slow cooling around the spherodizing of Fe3C and the carbon potential was kept in the range from 0.7% to 0.9%. The specimens sintered on these conditions were rolled into side seals of the rotary engines with 1.0 mm in thickness and 186 mm in radius of curvature.
