What effects sintered magnetic properties?
Several material and processing parameters effect magnetic performance of P/M materials. As density increases, the magnetic properties of maximum induction and permeability are increased significantly. The addition of certain alloying elements such as P and Si, improve the nearly all magnetic properties. In particular, these alloying elements tend to increase resistivity while decreasing (improving) coercive force. The presence of the interstitial elements, carbon and nitrogen, have a very potent detrimental effect on magnetic performance. Elevated levels of these elements are usually found as the result of their presence in the sintering atmosphere. Magnetic performance is also enhance by the use of higher sintering temperatures. High temperature sintering results in higher density, more refined pore structure and larger grain size, each which will improve magnetic performance.
