Investigation On Thermal Stability And Low Temperature Soft Magnetic Properties Of Two Kinds Of Fe-base Amorphous Strips

Fe-based amorphous strips have better soft magnetic properties than other materials.Based on the optimization of Fe-based amorphous strips'components and preparation process,this paper accumulates experimental experience and analyzes the different components and preparation processes.The influence of the properties of Fe-based amorphous strips,and further development of Fe-based amorphous strips with good performance.In this paper,the amorphous strip under low temperature soft magnetic properties and thermal stability of the amorphous strip conditions are studied.Two types of strips have been prepared using different preparation processes.They are:one is the Fe_70.43Nb_10.77Si_15.77Cu_2.34B_0.69.69 amorphous strip prepared by the gravity method and the pressure method;the other is the pressure method Three different thicknesses of Fe_70.43Nb_10.77Si_15.77Cu_2.34B_0.69.69 pressure-type amorphous strip and two different thickness Fe_70.43Nb_10.77Si_15.77Cu_2.34B_0.69.69 pressure-type amorphous strips to be annealed were prepared.The two types of Fe-based amorphous strips prepared using differential scanning calorimeter?DSC?,vibrating sample magnetometer?VSM?and annealing equipment are used to improve the soft magnetic properties and thermal stability of Fe-based amorphous strips.Preliminary analysis and summary.The following conclusions are drawn:1.The experimental results of Fe_70.43Nb_10.77Si_15.77Cu_2.34B_0.69.69 amorphous strips are as follows:?1?After the strips are prepared in the same proportion of master alloys,the actual ratio of amorphous strips is different.?2?The surface of the tape sample is rougher than the free surface.The reason may be that the surface of the copper roller is worn due to contact with the molten mother alloy.The surface of the amorphous strip has obvious directionality,that is,the rotation of the single roller drives the directionality of the internal structure of the strip.?3?In the tensile test,most of the strip samples are brittle fractures,and a few are plastic fractures.There are multiple crack sources distributed on the cross section of the strip,and there are several metal droplets on the crack.In addition,research and analysis of the amorphous strip with a small amount of Nb element can improve the plastic toughness of the strip.2.Three different thickness Fe_70.43Nb_10.77Si_15.77Cu_2.34B_0.69.69 pressure-type amorphous strips are obtained through the experimental results:?1?The three types of pressure-type strip samples with different thicknesses are in the amorphous state,which is the same as the previous Fe-B-Si,Fe-B-Si-Nb-P DSC experiment results are similar.From the experimental results,it is found that in the amorphous strip samples with different thicknesses,the thinner the strip thickness,the larger the supercooled liquid region.?2?Test the soft magnetic properties of three types of pressure amorphous strip samples with different thickness.In the low temperature test,the23?m thick strip has the best magnetic properties.3.Two different thickness Fe_70.43Nb_10.77Si_15.77Cu_2.34B_0.69.69 pressure amorphous alloys are annealed to test the low temperature soft magnetic properties of the strip samples after annealing.The study found that the 25?m thick strip had the best magnetic performance parameters at 672.12K annealing temperature.In general,the thinning of the strip is beneficial to improve the thermal stability and soft magnetic properties of the amorphous strip.In this topic,the thinning of the strip is improved by improving the preparation process,and the surface quality of the strip is improved,and the low temperature soft magnetic properties and heat are obtained.Amorphous strip with better stability.Picture[17]Table[14]Reference[99]...