Effect of Compaction Pressure on Microstructure and Magnetic Properties of Nd2Fe14B Alloys by Powder Metallurgy Process

Abstract

This work used powder metallurgy to fabricate a Neodymium Iron Boron magnet from neodymium, iron, and boron powders. This study aims to determine how compaction pressure affects the magnetic characteristics and phase structure of Nd12 Fe14 B. Sintering samples are airtight and resistant to oxidation by the surrounding environment due to the vacuum sealing process. Under compaction pressures of 40 MPa, the maximum hardness of the Nd12 Fe14 B magnet was 741.99 micro Vickers Hardness, with the maximum coercivity (Hc) of 386 kOe. On the other hand, a compaction pressure of 30 MPa resulted in a maximum remanence induction (Br) of 0.33 T. However, porosity remains obvious in the microstructure data, affecting the hardness and magnetic properties of Nd12 Fe14 B magnets.