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사출성형용 Nylon 6계 Nd - Fe - Co - Zr - B 펠렛의 자기특성
최승덕(S. D. Choi),이우영(W. Y. Lee),양충진(C. J. Yang) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.1
Nylon 6 based magnetic pellets for injection molding were produced using plasma arc melt-spun Nd_(10.5)Fe_(79)Co₂Zr_(1.5)B_7 powders. Two sorts of bonded magnets made of two different sizes of particles (38~75㎛ and 75~150㎛) were prepared to determine critical volume fraction of magnet powders, and the magnetic properties of the magnets were discussed as a function of density. For the nylon 6 based Nd-Fe-Co-Zr-B pellets made of 38~75㎛ particles, the critical volume fraction of powders 0.7 was obtained with the pellet density which is 90% of theoretical density while the magnets of 75~150㎛ showed the density of 87% of the theoretical value with the same volume fraction. The nylon 6 magnets with the addition of 0.5wt.% silicon oil only exhibited the best magnetic properties to have iHc=8.8 kOe, Br=5.1 kG and (BH)max=5.2 MGOe which are of world class. An empirical relationship in predicting the magnet density with a known fraction (Vs) of loading powders was obtained such as ρ(g / ㎤) = 1.1 + K Vs where the K ranges over 5.3~5.6 being dependent upon the particle size loaded.