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

A thermal formation sintering composition comprising:

• a binder;
• a sinterable powder material having a first average particle size;
• and
• a pore formation material having a second average particle size, a beginning draining temperature and a complete draining temperature, wherein the pore formation material does not soften or melt in mixing step or injection molding step applied to the thermal formation sintering composition,
• wherein the binder comprises:
• a low-temperature draining component which melts during thermal formation of the thermal formation sintering composition, the low-temperature draining component beginning draining at a temperature lower than the beginning draining temperature of the pore formation material, and completely draining at a temperature lower than the complete draining temperature of the pore formation material;
• and
• a high-temperature draining component which melts during thermal formation of the thermal formation sintering composition, the high-temperature draining component beginning draining at a temperature higher than the beginning draining temperature of the pore formation material, and completely draining at a temperature higher than the complete draining temperature of the pore formation material,
• wherein a content of the pore formation material is 60 to 80 volume % in the thermal formation sintering composition.