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Wpływ ciśnienia formowania materiałów kompozytowych na ich właściwości magnetyczne

Jakubas A., Seme S.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

2017

Nr 54

97--100

Miękkie kompozyty magnetyczne SMC są często stosowane w projektowaniu przetwornic i maszyn elektrycznych. Swoją popularność zawdzięczają łatwości formowania i możliwości dostosowania do konkretnych zastosowań. W p racy przedstawiono właściwości magnetyczne rdzeni wykonanych z proszku żelaza i suspensyjnego polichlorku winylu. Próbki przygotowywano przez prasowanie na gorąco mieszanki proszku PVC/Fe przy różnych ciśnieniach formowania. Na podstawie wykonanych pomiarów można stwierdzić, że wraz ze wzrostem ciśnienia formowania następuje polepszenie właściwości magnetycznych.

Soft magnetic composites are often used in the design of electromagnetic converters and electrical machines. Their popularity is due to the ease of molding and the ability to adapt to specific applications. The paper presents magnetic properties of cores made of iron powder and suspension polyvinyl chloride. The samples were prepared by hot compression of the PVC / Fe powder mix at various forming pressures. Measurement of magnetic parameters revealed an improvement in magnetic properties with increasing molding pressures. The presented measurement data show that it is possible to produce of SMC cores with good magnetic properties, using readily available components and in uncomplicated production processes. Cylindrical cores were made at different molding pressures, respectively: 234 MPa (30T), 390 MPa (50T), 507 MPa (65T). For the prepared samples we have determined their basic magnetic properties. The analysis of collected measurement data showed a significant relationship between SMC sample forming parameters and their magnetic properties. In addition, the measurements showed a poor dependence of the magnetic properties in developed SMC samples on the excitation frequency. The method of producing a polymer-metal composite described in the article is the subject of patent application P.420850.

The Influence Of The Temperature Of Liquid Nitrogen On The Physical Properties Of Powder Magnetic Composites

Kapelski D., Jankowski B., Przybylski M., Ślusarek B.

Archives of Metallurgy and Materials

2015

Vol. 60, iss. 2B

1323--1326

The paper presents the physical properties of soft magnetic iron composites and Nd-Fe-B bonded permanent magnets measured at room temperature and at liquid nitrogen. The objective of research was a determination of influence of liquid nitrogen temperature on the magnetic properties, resistivity and mechanical properties of different powder magnetic materials. Research was carried out for three powder materials: soft magnetic, i.e. Somaloy 700, AncorLam and hard magnetic powder MQP-B used for production of bonded magnets. Composite specimens were prepared by compression moulding technology.

Determination Of Power Loss In Fe-Based Soft Magnetic Composites

Jankowski B., Kapelski D., Ślusarek B., Szczygłowski J.

Archives of Metallurgy and Materials

2015

Vol. 60, iss. 2B

1411--1415

The magnetic properties of Fe-based composite materials with different particle sizes were investigated. The results of energy loss density were obtained from measurements of the static (DC) hysteresis cycles ranging from 0,2 to 1,4 T. In turn, the results of power loss density were obtained from measurements of the dynamic (AC) hysteresis cycles ranging from 20 to 400 Hz and at the maximum flux density 0,3; 0,9 and 1,3 T. Two sets of specimens was analyzed in the investigation: the specimens compacted under pressure of 800 MPa and hardened at 500°C and the specimens compacted under different pressure and hardened at 500°C. Specimens of the second set had the same density. The study confirmed the influence of particle size distribution on magnetic properties of Fe-based soft magnetic composites.