| 摘要 |
PROBLEM TO BE SOLVED: To provide a sintered alloy exhibiting sliding frictional characteristics equal to those of a casting material and also high in strength by about 10%. SOLUTION: Cast iron powder of 40 to 60 pts.wt. composed of 2.5 to 5% C, 0.5 to 2% Si, and the balance Fe, and in which, into the structure, massive graphite is dispersed, and precipitated graphite is adhered and alloy iron powder of 60 to 40 pts.wt. composed of 0.5 to 2% Mo, 0.5 to 4% Ni, and the balance Fe are mixed, and the powdery mixture is sintered at a heating temperature for a heating time at a cooling rate by which graphite having a shape equivalent to IV to VI of ASTM A247 is dispersed into a matrix in the cast iron particle parts of the sintered body structure, and the matrix structure containing Mo and Ni mainly shows bainite.
|
