Abstract
The effect of Niobium (in the form of a 70% Niobium Fe-Nb alloy) added to a sintered permanent magnet alloy of the Alnico 5 type, (8.3% Al, 15% Ni, 24% Co, 3% Cu, the remainder Fe) has been studied, cpartiulary, in relation to their linear shrinkage, density, magnetic properties, transverse rupture strength, pore size, and microstructure. Experimental results indicate that the addition of 0.35∼0.70% of Niobium improves the qualtities of Alnico 5 type alloys prepared by sintering in pure Hydrogen, but large percentage additions causes pore aggregation, rapid grain growth, and detrimental effects on rupture strength and magnetic properties.
