The Research Of High Saturation Magnetic Flux Density Bs, Low Loss Soft Magnetic

Soft magnetic materials as basic function materials of electronic information and electronic industry have been used extensively in communication, power supply, computer and various electrionic product fields. With the improvement of information technique and the digital of electronic producs, the new demand of soft magnetic materials and component was put forward, such as miniaturization, high saturation magnetic flux density Bs and low loss Ps etc., At present, the investigation focus on the soft magnetic alloy is how to gain low loss under of high saturation magnetic flux density Bs.Fe-based, FeCo-based and Co-baed amorphous alloys were prepared by casting and rapid quenching. FeAl and FeSiAl crystalline materials were prepared by casting. The phase structures of the as-cast and quenched alloys were analyzed by XRD. The loop, Bs, Hc and Ps were measured by the soft magnetic equipment MATS-2010S. The samples were heated in the the tube type heat treatment stove. This thesis researched the effects of alloy element and heat treatment on the properties of the samples. The high saturation magnetic flux density Bs and low loss soft magnetic had been made. Important conclusions were as follows:â‘ With the increasing of the content of Co, the saturation magnetic flux density of the amorphous increased firstly, and then decreased. When the increasing of the content of Co in a little range, the intersection of function of border upon atom will increase, then the exchange of border upon atom will increase with it. This is the reason of the increase of the saturation magnetic flux density of the amorphous in some range. But this increase only is in limited confine, when the content of Co preponderate over 15%, the saturation magnetic flux density begins fall.Si can take place B as a glass formation element, but with the addition of silicon, saturation magnetic flux density will decline, and coercive intensity and loss will increase. Nb also can take place B as a glass formation element. With its increase, saturation magnetic flux density will decline more,and coercive intensity and loss will increase more. Adding appropriate Ni element to FeSiAl, the hardness of alloy will decline and the properties of machining and ductility enhanced, so alloy can be mechanical machining. â‘¡With the employment of transverse magnetic field during heat treatment, the directions of magnetic domain become more concentrate. The shape of loop is plat plane, the area of loop and loss decrease. With or without magnetic in the heat treatment both achieved a similitude result, also exist a best temperature. The differ only is that the area of loop is smaller and loss is lower under transverse magnetic field in heat treatment The loss of sample under the quench state is nonlinear with the change of magnetic flux density. With increasing of magnetic flux density, the increase of loss is quick. The loss of the sample which has been heat treated is linear with the change of magnetic flux density in a wide range. But the loss of crystalline soft magnetic always is nonlinear with the change of magnetic flux density.â‘¢T he loss value of the preparative amorphous sample Fe_4.7Co_75.3Si₄B₁₆ under quench state is(magnetic flux density is 1.0T, frequency is 10KHz)99.36W/kg . The loss value of the preparative amorphous sample Fe₇₂Co₈Si₅B₁₅ under heat treatment(magnetic flux density is 1.0T, frequency is 10KHz)39.67W/kg,and saturation magnetic flux density B10 is1.537T, the heat treatment is heat preservation 30 minutes at 380℃and transverse magnetic field in heat treatment is 500Oe. The similarity properties of magnetic as the two samples were not reported.