Sintered Nd-Fe-B magnets have a market share of more than 85 % of the total Nd-Fe-B market. The powder metallurgical production route has the advantage over other routes that simple geometries are producible in wide ranges concerning their dimensions. The pilot line is designed for the production of up to 10 kg magnetic material per run. Combined with the available analytic methods the control of chemical composition, microstructure and physical properties is possible throughout the entire production process.
To get the desired microstructure the alloy is molten inductively in the strip caster and poured onto a copper wheel. The flakes obtained by this process are decrepitated in a hydrogen autoclave and subsequently milled in a jet or target mill to fine powders with particle sizes in the range of a few micrometers. The powder is aligned and pressed in transversal magnetic field in a uniaxial press. The green compact is sintered in a sintering furnace and subjected to a final annealing for optimization of magnetic properties.