| The Fe73.5Cu1Nb3Si15.5B7nanocrystalline ribbon with thickness of32μm was widely used in inverter welder main transformer. The high frequency loss led to the limitation of the application as its thicker thickness, simultaneously, the ribbon has high prime cost as its constituent element Nb, and the main transformer core has a risk of magnetic bias as the high permeability. The crystallization kinetics of1K107B ribbon with different thickness and FeCuMoSiBNi amorphous ribbon used for inverter welder main transformer was studied in this paper. The activation energy of crystallization Ep1, EP2of several kinds of ribbon was calculated using Kissinger equation and Doyle equation respectively. The results show that the relative error of the crystallization kinetics which calculated from Kissinger equation and Doyle equation was rather low, the thermal stability of the ribbon was effected by ribbon thickness,1K107B ribbon with different thickness has the different crystallization kinetics, the crystallization activation energy Ep1, EP2of Fe72.5Cu1Mo3Si15.5B7Ni1amorphous ribbon was less than Fe73Cu1Mo3Si13.5B9Ni0.5. The width of the peak of crystallization ΔTp of the ribbon with the same composition was stable under different heating rate relatively. The ΔTp of the ribbon elevated slightly with the thickness increased, the23μm thickness ribbon has the biggest ΔTp. The initial crystallization temperature Tx, the first peak crystallization temperature Tpi and the second peak crystallization temperature TP2of the ribbon increased with the increasing of heating rate β, they had a linear relationship with Inβ, it can be expressed as T=AT+Brlnβ after fitting by least square.The optimal heat treatment of cores wounded with different thickness1K101and1K107B ribbon was studied, meanwhile, the dynamic magnetic properties, static magnetic properties of cores wounded with different thickness of ribbon was studied. It was found that, the1K101cores were not suitable for high frequency as its higher high-frequency core loss. The optimal heat treatment was different for cores wounded with different thickness ribbon, the dynamic loss, coercivity and remanence of the cores reduced gradually with the decrease of the ribbon thickness, meanwhile, the initial permeability increased. The inverter welder main transformer wounded with thinner nanocrystalline ribbon can obtain lower loss and lower residual magnetism under the same operating frequency, so the transformer can obtain lower temperature rise and higher operation stability. Cores wounded with thinner nanocrystalline ribbon meet the requirement of the inverter welder miniaturization, provides a better plan for the development of energy conservation and environmental protection of inverter welder, shows a great potential in the field of high-end application. Simultaneously, thinner ribbon can improve the efficiency of core winding and machining efficiency of thermal-treated cores effectively as its better toughness before and after heat treatment.The soft magnetic properties, the best heat treatment of Fe73CuiMo3Si13.5B9Ni0.5and Fe72.sCu1Mo3Si15.5B7Ni1cores were studied. The results show that, the loss of cores change a little compared with cores wounded with32μm1K107B ribbon, the cores can completely meet the performance requirements of inverter welder main transformer, simultaneously, lower permeability and lower residual magnetism improved the anti magnetic bias ability of inverter welder main transformer. The core shows excellent temperature stability as its loss, permeability and residual magnetism reduced gradually with the temperature rising between the range of-50～140℃. The prime cost of ribbon reduced10%at least after substituting Mo for Nb. It improves the competitiveness of the nanocrystalline materials used for inverter welder generally, on the other hand, ribbon substituting Mo for Nb obtain higher toughness, improved the technological properties and the mechanical properties of ribbon and the product rate of cores, shows some practical value. However, further studies are necessary as its narrow range of optimum heat treatment. |
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