| Fe-based amorphous nanocrystalline alloys have excellent soft magnetic properties due to low average magnetic anisotropy and magnetostriction coefficient.However,the magnetic permeability of Fe-based soft magnetic materials decreases significantly with the increase of frequency,which cannot meet the needs of electronic components at high frequencies.Therefore,this paper has carried out research on the influence of different heat treatment processes on high-frequency soft magnetic properties.In this thesis,heat treatment techniques such as conventional nitrogen protection heat treatment,hot isostatic pressing and magnetic field heat treatment are used to study different annealing temperatures to improve the soft magnetic properties of 1K107 series amorphous nanocrystalline alloys.X-ray diffractometer,precision magnetic component tester and soft magnetic AC equipment were used to measure the soft magnetic properties such as the crystal structure of the iron-based amorphous ribbon,the inductance L of the magnetic core and the magnetic loss P_sConcluded as follow:1)The best annealing temperature for nitrogen annealing of 1K107C1,1K107C2,1K107C3,1K107D,1K107J strip cores is 560℃,550℃,550℃,550℃,560℃,and the maximum low-frequency(1 k Hz)effective permeability is 147.1k,152.2k,139.4k,152.6k,123.6k,and the maximum high-frequency(100 k Hz)effective permeability is 11.5k,20.9k,24.2k,19.8k,16.1k respectively.Among them,the 1K107C2 and 1K107D strip cores have the maximum low-frequency(1 k Hz)effective permeability after nitrogen annealing.2)After the 1K107 series nanocrystalline magnetic cores undergo secondary transverse magnetic annealing,their low-frequency effective permeability decrease,and the high-frequency effective permeability increase.The best annealing temperatures for the secondary transverse magnetic annealing of 1K107C1,1K107C2,1K107C3,and 1K107D strip cores is 500℃,420℃,440℃,420℃,and the low-frequency(1 k Hz)effective permeability is 69.0k,95.7k,81.8k,75.7k,and the high-frequency(100 k Hz)effective permeability is 24.2k,29.9k,31.5k,26.3k respectively.Among them,1K107C3 strip cores have the maximum high-frequency(100 kHz)effective permeability after the secondary transverse magnetic annealing.3)After 1K107C1 and 1K107J strip cores are subjected to nitrogen annealing,the low-frequency(1 k Hz)effective permeability is 147.1k and 120.2k respectively,and the high-frequency(100 k Hz)effective permeability is 11.6k and 16.1k respectively.However,after them are subjected to hot isostatic pressing,the low-frequency(1 k Hz)effective permeability is 103.4k and 131.7k respectively,which is reduced by 29.7%and increased by9.6%compared with the former;the high-frequency(100 k Hz)effective permeability is19.0k and 13.4k respectively,which is an increase of 63.8% and a decrease of 16.8% compared with the former.The hot isostatic pressing process can improves the high-frequency soft magnetic properties of 1K107C1.4)Based on the analysis of the effect of three annealing processes on the performance of high-frequency magnetic cores,the best annealing process for the 1K107C1 cores is secondary transverse magnetic annealing,followed by hot isostatic pressing,and the worst is nitrogen annealing.The high-frequency(100 k Hz)effective permeability of 1K107C1magnetic cores is 11.6k,19.0k,and 24.2k respectively after nitrogen annealing,hot isostatic pressing,and secondary transverse magnetic annealing.However,the 1K107C2 and1K107C3 strip cores have the maximum high-frequency(100 kHz)effective permeability after secondary transverse magnetic annealing,up to 29.9k and 31.5k respectively.5)Among the magnetic core samples subjected to nitrogen annealing,1K107C2 and1K107C3 nanocrystalline cores only have good stress resistance at low frequencies,and1K107C3 and 1K107D nanocrystalline cores only have good stress resistance at high frequencies after 550℃nitrogen annealing.The 1K107 series of strip cores have been subjected to hot isostatic pressing and secondary transverse magnetic annealing respectively,and they have good anti-stress performance at low or high frequencies.Among them,the best annealing process is secondary transverse magnetic annealing. |
PDF Full Text Request