The aim of this research was to investigate the effect of elevated temperatures on soft magnetic ... more The aim of this research was to investigate the effect of elevated temperatures on soft magnetic properties of the Co-modified Finemet type alloys designed for high-temperature and high-frequency applications in power electronics. The Finemet type alloys modified by Co were subjected to thermo-magnetic treatment in an external magnetic field of 160 kA/m, followed by ageing for up to 150 hours at the temperatures of 200 and 300 °C, and their AC magnetic properties have been measured. For selected alloys dependence of soft magnetic properties on temperature up to 350 °C have also been measured. The obtained results confirmed that partial substitution of Fe with Co in Finemet type alloys improves their high-temperature behaviour thus making them suitable for functional application in power electronic equipment.
Paper presents possibilities of utilizing Fe77Cr2B16Si5 amorphous alloy in development of magneto... more Paper presents possibilities of utilizing Fe77Cr2B16Si5 amorphous alloy in development of magnetoelastic tensile stresses sensors. In presented sensors the uniform distribution of tensile stresses was achieved. These stress were perpendicular to the direction of magnetizing field in the ring-shaped core. Presented results indicated high magnetoelastic sensitivity of Fe77Cr2B16Si5 amorphous alloy under tensile stresses. Moreover it was indicated, that magnetoelastic sensitivity increases due to thermal relaxation – annealing of amorphous core.
Paper presents a novel application of magnetostrictive delay lines, which give a possibility of r... more Paper presents a novel application of magnetostrictive delay lines, which give a possibility of real time monitoring of strain in ceramic components. Magnetostrictive delay line was based on highly magnetostrictive Fe-Si-B amorphous alloy ribbon, mounted outside of ceramic component, what is a new solution for increasing sensor’s sensitivity. Developed specially for this sensor, hybrid digital-analog signal processing unit covers the sample-and-hold integrated circuit. The achived sensitivity and repeatability of the sensor confirms, that such solution is suitable for ceramic machine tool monitoring.
... The most interesting magnetic properties of Finemet type alloys, in which Fe was partially re... more ... The most interesting magnetic properties of Finemet type alloys, in which Fe was partially replaced by Co ... two-phase system in nanocrystalline alloys has been discussed in detail for Finemet alloys [1, 4 ... For alloys annealed at 793 K with different Co content, the grain size varied ...
Magnetic properties of the cores made from the (Fe1−xCox)73.5Cu1Nb3Si13.5B9 alloy (x=0.136, 0.272... more Magnetic properties of the cores made from the (Fe1−xCox)73.5Cu1Nb3Si13.5B9 alloy (x=0.136, 0.272, 0.408, 0.544, and 0.680) were investigated within frequency range of 0.05–50kHz and at the environment temperatures ranging from 298 to 643K. It was found that the alloy with Co content corresponding to x=0.136 has the best high-temperature and high-frequency magnetic properties in comparison with the other alloys investigated
ABSTRACT Dynamic magnetic properties of a new FeCoNbBP alloy were measured under four types of vo... more ABSTRACT Dynamic magnetic properties of a new FeCoNbBP alloy were measured under four types of voltage excitation: sinusoidal, triangular, square and ramp. Samples were prepared in a form of toroidal cores wound from melt-spun amorphous ribbons and subjected to suitable thermo-magnetic treatment in a transverse magnetic field. The measurements were carried out within a frequency range from 1 to 50kHz using a computerized hysteresis loop tracer fitted with the function generator enabling non-sinusoidal voltage excitation. It was found that the core losses for this material clearly depend on excitation conditions and over the frequency range studied they were generally higher at triangular waveform and lower at square waveform compared to sinusoidal excitation. At the square wave voltage excitation, the differences were reaching 19%.
The aim of this research was to investigate the effect of elevated temperatures on soft magnetic ... more The aim of this research was to investigate the effect of elevated temperatures on soft magnetic properties of the Co-modified Finemet type alloys designed for high-temperature and high-frequency applications in power electronics. The Finemet type alloys modified by Co were subjected to thermo-magnetic treatment in an external magnetic field of 160 kA/m, followed by ageing for up to 150 hours at the temperatures of 200 and 300 °C, and their AC magnetic properties have been measured. For selected alloys dependence of soft magnetic properties on temperature up to 350 °C have also been measured. The obtained results confirmed that partial substitution of Fe with Co in Finemet type alloys improves their high-temperature behaviour thus making them suitable for functional application in power electronic equipment.
Paper presents possibilities of utilizing Fe77Cr2B16Si5 amorphous alloy in development of magneto... more Paper presents possibilities of utilizing Fe77Cr2B16Si5 amorphous alloy in development of magnetoelastic tensile stresses sensors. In presented sensors the uniform distribution of tensile stresses was achieved. These stress were perpendicular to the direction of magnetizing field in the ring-shaped core. Presented results indicated high magnetoelastic sensitivity of Fe77Cr2B16Si5 amorphous alloy under tensile stresses. Moreover it was indicated, that magnetoelastic sensitivity increases due to thermal relaxation – annealing of amorphous core.
Paper presents a novel application of magnetostrictive delay lines, which give a possibility of r... more Paper presents a novel application of magnetostrictive delay lines, which give a possibility of real time monitoring of strain in ceramic components. Magnetostrictive delay line was based on highly magnetostrictive Fe-Si-B amorphous alloy ribbon, mounted outside of ceramic component, what is a new solution for increasing sensor’s sensitivity. Developed specially for this sensor, hybrid digital-analog signal processing unit covers the sample-and-hold integrated circuit. The achived sensitivity and repeatability of the sensor confirms, that such solution is suitable for ceramic machine tool monitoring.
... The most interesting magnetic properties of Finemet type alloys, in which Fe was partially re... more ... The most interesting magnetic properties of Finemet type alloys, in which Fe was partially replaced by Co ... two-phase system in nanocrystalline alloys has been discussed in detail for Finemet alloys [1, 4 ... For alloys annealed at 793 K with different Co content, the grain size varied ...
Magnetic properties of the cores made from the (Fe1−xCox)73.5Cu1Nb3Si13.5B9 alloy (x=0.136, 0.272... more Magnetic properties of the cores made from the (Fe1−xCox)73.5Cu1Nb3Si13.5B9 alloy (x=0.136, 0.272, 0.408, 0.544, and 0.680) were investigated within frequency range of 0.05–50kHz and at the environment temperatures ranging from 298 to 643K. It was found that the alloy with Co content corresponding to x=0.136 has the best high-temperature and high-frequency magnetic properties in comparison with the other alloys investigated
ABSTRACT Dynamic magnetic properties of a new FeCoNbBP alloy were measured under four types of vo... more ABSTRACT Dynamic magnetic properties of a new FeCoNbBP alloy were measured under four types of voltage excitation: sinusoidal, triangular, square and ramp. Samples were prepared in a form of toroidal cores wound from melt-spun amorphous ribbons and subjected to suitable thermo-magnetic treatment in a transverse magnetic field. The measurements were carried out within a frequency range from 1 to 50kHz using a computerized hysteresis loop tracer fitted with the function generator enabling non-sinusoidal voltage excitation. It was found that the core losses for this material clearly depend on excitation conditions and over the frequency range studied they were generally higher at triangular waveform and lower at square waveform compared to sinusoidal excitation. At the square wave voltage excitation, the differences were reaching 19%.
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Papers by Aleksandra Kolano-Burian