公开(公告)号：JPH02294405A

公开(公告)日：1990-12-05

申请号：JP9659190

申请日：1990-04-13

Applicant: BASF AG

Inventor： MARUTEIN BUREMAHAA ,  RAINHORUTO SHIYUREEGERU ,  DEIITAA BUAINANTO

IPC: B22F3/10 ,  B22F3/22 ,  C22C33/02

Abstract: PURPOSE: To reduce desired time for dewaxing an injection molded part and to improve the density of the sinetred parts, at the time of pelletizing a mixture of metal powder and a binder, executing injection molding, thereafter removing the binder and executing sintering, by adding a metallic oxide to the mixture of the metal powder and the binder. CONSTITUTION: Carbonyl iron powder is mixed, as a binder, with polyethylene and the low molecular weight wax thereof and is furthermore mixed with iron oxide powder by 2 to 30 wt.% to the carbonyl iron powder. This iron oxide is the powdery one with an approximately spherical shape and 10 to 120 m /g specific surface area obtd. by burning Fe(CO3 )5 in the presence of surplus oxygen. The mixture of the carbonyl iron powder, binder and iron oxide is pelletized and is thereafter subjected to injection molding into a desired shape by an injection molding machine. The molded part is heated in an inert gas atmosphere such as N2 , the binder is removed by the presence of the iron oxide, moreover, C in the carbonyl iron powder is decarburized, and, by the subsequent sintering, ferrous sintered parts having high density can be produced.