급속승온공정을 이용한 사출 성형된 Fe 소결체의 미세조직 및 소결거동
Microstructure and Sintering Behavior of Injection Molded Fe Sintered Body Using Rapid Thermal Heating Process
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Abstract
Using the nano Fe powders having 50 nm in diameter, Fe compact bodies were fabricated by injection molding process. The relationship between microstructure and material properties depending on the volume ratio of powder/binder and sintering temperature were characterized by SEM, TEM techniques. In the compact body with the volume percentage ratio of 45(Fe powder) : 55(binder), which was sintered at 700℃, the relative density was about 97%, and the values of volume shrinkage and hardness were about 66.3% and 242.0 Hv, respectively. Using the composition of 50(Fe powder) : 50(binder) and sintered at 700℃, the values of relative density, volume shrinkage and hardness of Fe sintered bodies were 73.3%, 47.6% and 152.8 Hv, respectively. They showed brittle fracture mode due to the porous and fine microstructure.
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