Method of making a porous sintered body, a compound for making the porous sintered body, and the porous sintered body

摘要

A method of making a porous sintered body includes a formation step S102 where a sintering compound which contains a binder and a sinterable powder material is into a predetermined shape; a degreasing steps S103, S104 and S105 where the binder is removed from a formed body obtained in the formation step; and a sintering step S108 where a degreased body after the degreasing step is sintered into a sintered body. The binder contains a component which drains at a temperature higher than a draining temperature of the pore formation material drains. The pore formation material is drained in the degreasing step, with part of the binder remaining un-drained. The present invention enables to manufacture porous sintered bodies which are highly porous, and highly accurate in shape and dimensions. The present invention also enables to manufacture porous sintered bodies which offer functionalities not available before.

主权项

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.