The object of this paper is to examine the optimum sintering condition which have excellent mechanical properties compared to the conventional oilless bearing. It is shown that the sintering rate is the most excellent at 850°C, especially KAB-23, KAB-23G, PBF-8 specimens. With increasing the nitrogen injection rate, the apparent porosity increased gradually. In contrast, with increasing the hydrogen injection rate, the apparent porosity decreased gradually. It is shown that the apparent porosity is very useful in the range of nitrogen injection rate 2Nm 3 and hydrogen injection rate 10Nm 3 .

• 권일현(Member, Department of smart automobile engingeering, Wonkwang University) | Il-Hyun Kwon Corresponding author
• 이정권(Changwon Metal Industry) | Jeong-Kwon Lee