Patent ID: 9272333
Filing Date: 2016-03-01
CPC Classification: B22F,C04B,Y10T

Claim Text:
1. A method of making a porous sintered body, comprising: a pellet making step of making a compound pellet by heating and mixing a sintering compound containing a binder, a sinterable powder material and a pore formation material at a temperature causing the binder to melt but not causing the pore formation material to soften; a thermal formation step of forming the pellet made in the pellet making step into a predetermined shape at a temperature causing the binder to melt but not causing the pore formation material to deform; a degreasing step of removing the binder from a formed body obtained from the thermal formation step, at a temperature causing the pore formation material to drain and not causing a part of the binder to drain; and a sintering step of sintering a degreased body after the degreasing step, wherein the binder contains a component which melts at a temperature attained in the pellet making step and the thermal formation step and drains at a temperature higher than a temperature at which the pore formation material drains, the porous sintered body is formed during the sintering step, and a rate of porosity of the porous sintered body is 50-80%, correlating to a mixing rate of of the pore formation material in the sintering compound.