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Furuya, Satoshi,Ozoe, Nobuaki 한국주조공학회 2022 한국주조공학회지 Vol.42 No.3
This study aims to improve the machinability of gray cast irons in high speed cutting by using nonmetallic inclusions. In this research, small quantities of AL and Mg were added to conventional gray cast irons without influencing their mechanical characteristics and castability to investigate the effects of these nonmetallic inclusions in the gray cast irons on tool wear in high speed cutting. During the high speed turning of gray cast iron containing Al and Mg using a cermet tool, protective layers consisting of Al, Mg, Si, Mn, S and O were detected on the flank face and rake face of the tool, and flank and crater wear were significantly reduced compared to the turning of conventional gray cast iron and gray cast iron added with Al. The effect of inclusions on tool wear increased with increasing cutting speed, and flank and crater wear was the smallest at the cutting speed of 700m/min. Moreover, in face milling, the addition of Al and Mg drastically decreased the wear rate, and wear hardly progressed even in prolonged cutting length after initial wear. The amount of adhesion on tool faces increased as the cutting speed increased. This increase in cutting speed resulted in the formation of a thick protective layer and the reduction of tool wear. Furthermore, the addition of small amounts of Al and Mg prevented thermal cracks in the face milling of gray cast irons.
ALAM MOHAMMAD SAYED,Yoshihisa Ozoe,Dong-Ung Lee 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.1
A series of 1-(2,6-dichloro-4-trifluoromethylphenyl)-1H-1,2,3-triazole analogues have been tested for antimicrobial activity against thirteen bacteria and three fungi in order to observe the broad spectrum activity. Among the compounds tested, the C-4-chloropropyl derivative exhibited potent antibacterial and antifungal activities. The C-4-substituted regioisomers of 1-(2,6-dichloro-4-trifluoromethylphenyl)-1H-1,2,3-triazole exhibited moderate selectivity to broad spectrum activity, compared to that of 5-substituted regioisomers.