鋳鉄粉末を用いた金属粉末射出成形体の諸特性 Properties of Metal Injection Molded Materials Using Cast Iron Powder
The metal injection molding process (MIM) is a key technology which makes it possible to form complicated 3-dimensional parts in near net shape. Cast iron has unique properties such as damping capacity. In this study, it is intented to study the properties of metal injection molded materials using cast iron powder. Water-atomized cast iron powder was deoxidized in vacuum. The deoxdized powder, spherical graphite powder, wax and resin were mixed and injected to the mold. The injected body was sintered by way of pre-sintering. The maximum tensile strength is 750 MPa which is comparable to that of ductile cast iron. The estimated damping capacity (logarismic decrement) is 450×10<sup>-4</sup>, indicating exellent value as compared with gray iron. The reasons are considered as follows : Oxygen was reduced by carbon in the cast iron powder during deoxidization. Carbon diffuses to the matrix during pre-sintering. Graphite precipitates into the spherical pores during temperature drop after sintering. The high damping capacity and high tensile strength is considered to be obtained by the structure mixed with graphite particles and pores in matrix.
- 鋳造工学 = Journal of Japan Foundry Engineering Society
鋳造工学 = Journal of Japan Foundry Engineering Society 70(2), 132-137, 1998-02