Fe粉末添加法によるNd-Fe-B系焼結磁石の作製

抄録

Effects of Fe-powder addition on sintering behavior, magnetic properties and corrosion resistance of Nd-Fe-B sintered magnets have been investigated. Fe-powder addition to Nd-Fe-B ternary alloy powder is very useful to control the constituent phases of the sintered magnets. When Fe-powder is added to the ternary alloy powder, Fe-powder reacts with the liquid phase formed from the ternary alloy powder and generates the Nd₂Fe₁₄B main phase(T₁) during the sintering process. As a result, residual flux density (Br) of magnets prepared by the Fe-powder addition method increases with incerasing the content of T₁ phase. Furthermore, corrosion resistance of the magnets has been improved with decreasing the content of Nd-rich phase due to Fe-powder addition.