Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


공학

한국표면공학회지 (31권4호 181-190)

Chararcteristice of Al Depositon on Nd-based Permanent Magnet Prepared by Ion Plating

이온 플레이팅에 의한 Nd계 희토류 영구자석의 Al 증착 특성

여현동;백운승;권식철;장도연;공곤승;박동원;김대룡;

경북대학교 금속공학과;한국기계연구원;성림첨단산업(주);

Abstract

Al ion plating was carried to improve corrosion resistance of Nd-based permanent magnet made by prwder molding method. The effects of applied votage, pressyre and temperature were investigated to find the reation between coating parameters and their properties. Density of coating layer increased with voltage and thus corrosion resistance improved. However when voltage was applied more than 1000V, corrosion resistance whet down because of resputtering effect. Good corrosion resistance was acquired when gas pressure was $5.0 imes10^-2$>torr, which is satisfied momentum energy of Ar, Al ions as well as quantity of plasma. The layer coated in low temperature range have better surface density and corrosion resistance than in high temperature. This result is seemed due to the characteristics of substrate itself. All coating layers were showed stong adhesion with substrate.

Keywords