Download or read book Development of Ferrite coated Soft Magnetic Composites written by Katie Jo Sunday and published by . This book was released on 2017 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soft magnetic composites (SMCs) comprised of ferrite-coated ferrous powder permit isotropic magnetic flux capabilities, lower core losses, and complex designs through the use of traditional powder metallurgy techniques. Current coating materials and methods are vastly limited by the nonmagnetic properties of organic and some inorganic coatings and their inability to withstand high heat treatments for proper stress relief of core powder after compaction. Ferrite-based coatings are ferrimagnetic, highly resistive, and boast high melting temperatures, thus providing adequate electrical barriers between metallic particles. These insulating layers are necessary for reducing eddy current losses by increasing resistivity in order to improve the overall magnetic efficiency and subsequent frequency range. The goals of this work are to correlate ferrite-coated Fe powder composites microstructure for the coating and core powder to magnetic properties such as permeability, coercivity, and core loss. We first explore the relevant concepts of SMC materials from their composition to processing steps to pertinent properties. This thesis employs a suite of characterization techniques for powder and composite properties. We use X-ray diffraction, scanning electron microscopy, and transmission electron microscopy to provide a complete understanding of the effect of processing conditions on ferrite-coated Fe-based SMCs. Magnetic, mechanical, and electrical properties are then analyzed to correlate microstructural features and determine their effect on such properties. In the second part of this thesis, we present a proof of concept study on Al2O3- and Al2O3- Fe3O4-coated Fe powder composites, illustrating magnetization is highly dependent on ferromagnetic volume. We then expand on previous work to compare an ideal, crystalline state using Fe3O4-Fe thin film heterostructures to a highly strained state using bulk powder studies. Fe3O4-coated Fe composites are produced via mechanical milling and analyzed for magnetic core loss dependence on particle size, cure temperature, and microstructure of both coating and core powder. We present a significant increase in core loss related to eddy current loss from coating particles sintering and Fe grain growth. Lastly, a more resistive coating material, NiZnCu-ferrite, is applied for improved resistivity, which leads to lower eddy current loss and improved magnetic performance. By highlighting the importance of microstructure and composition on magnetic properties, a closer look at interfacial features and local microstrain are necessary and accomplished in this work. Future developments of ferrite-based SMC coatings are required to transform the use of electromagnetic devices in today's society.
Download or read book Soft Magnetic Materials written by Tian Biao Zhang and published by Trans Tech Publications Ltd. This book was released on 2011-07-27 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). The objective of this special collection was to provide a forum for researchers, educators, engineers and government officials, involved in the general areas of soft magnetic materials, soft ferrites, powder cores, composite materials, thin films, metamaterials, magnetic measurements and instrumentation, to disseminate their latest research results and to exchange views on the future research directions of these fields.
Download or read book Development of Iron based Soft Magnetic Composites with Novel Coating Materials written by Benjamin Dyer and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Sintered Lamellar Soft Magnetic Composites written by Patrick Lemieux and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Research carried out over the last ten years has shown that Soft Magnetic Composite (SMC) materials are potentially good candidates to replace laminated steel sheets in electric motors. Indeed, their increased isotropy, combined with a near net shape forming technology, will allow motor designers more flexibility for the efficient design of electric motors. Literature already reports many new designs with higher power to weight, or power to volume, ratios of motors, while simultaneously decreasing their assembling costs. However, SMC materials that are currently available in the marketplace do not have sufficiently good mechanical and magnetic properties to fully benefit from the design advantages brought about by the SMC approach. They are based on irregular shaped water atomized iron particles, an intricate and expensive process. By combining three different technologies; a) the direct casting of iron ribbons, b) thin coating (Sol-Gel/ PVD) and c) powder metallurgy, it should be possible to produce a low cost magnetic material with superior mechanical and magnetic properties. This new composite material is referred to as a Sintered Lamellar Soft Magnetic Composite (SL-SMC). All the technological barriers in the SL-SMC process have been addressed during the course of this doctoral study. In the first part of this thesis, the mathematical modeling of a new direct casting technology adapted to the base ribbon required for the SL-SMC is first reported and the results discussed. A few casting experiments were performed in order to validate the model of this new casting approach and the results compared to similar experiments reported in the literature. The most important parameters were determined. The second part of the thesis focusses on the development of an economic coating technology to insulate individual particles of the SL-SMC composite. The third part of the thesis concerns the development of a viable mass production, net shaping technology, based on standard powder metallurgy compaction techniques. Finally, SL-SMC behaviour, mechanical and magnetic properties as a function of the numerous processing conditions tested with different base alloys and additives are presented, and compared to the best SMC's and Standard Lamination solutions presently available in the marketplace.The thesis is completed by a modelling experiment and some calculations of the potential improvements of different kinds of motors by using SL-SMC's. Avenues for further optimization are considered and presented." --
Download or read book Development of Nanostructured Soft Magnetic Composite Materials Using the Field Assisted Sintering Technique written by Bowen Dong and published by . This book was released on 2021 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, the development of nanostructured soft magnetic composite materials using the field-assisted sintering technique (FAST) from core-shell powders has been investigated. FAST consolidation experiments have been performed on a series of core/shell powders. The crystal structure, microstructure, relative density, resistivity, and magnetic properties of the compacted samples were characterized. Through the study on the FAST consolidation of core/shell Fe/SiO2 (30-50 nm, SiO2 thicknesses) powders, the upper limit of the sintering temperature when using graphite tooling for Fe-based core/shell powder was determined to be 1050 oC. A processing condition of 25 MPa loading pressure, 800 oC sintering temperature, and 10 minutes holding time was successfully used for FAST consolidation of core/shell Fe/SiO2 (30-50 nm, SiO2 thicknesses) powders. An `edge effect' of deteriorated magnetization (drop by up to 6.6% within the 2 mm distance to the edge) and coercivity (increase by up to 140% within the 2 mm distance to the edge) on the radial direction of the compacted Fe/SiO2 (30-50 nm, SiO2 thicknesses) samples sintered at 850 oC, 950 oC, and 1050 oC for 1 hour was discovered. This effect was found to be connected to the decreasing relative density achieved (drop by up to 4.5% within the 2 mm distance to the edge) in the compacts at the locations near the circumference. For the 1050 oC sintered Fe/SiO2 compact, this phenomenon was the most pronounced. Within the 2 mm distance in the radial direction approach to the edge, the magnetization of the sample dropped by 6.6% from the averaged value of 212 Am2/kg of the whole compact, and coercivity increased about 200% from the averaged value of 591 A/m, while the relative density decreased from the averaged value of 99% for the compact to 94%. The decreasing relative density is attributed to two factors: (1) The temperature gradient that led to lower local sintering temperature at the position approaching the edge. (2) The lower stress distributed on the area near the edge during the consolidation process. The study on the FAST consolidated of Fe/SiO2 (30-50 nm, 800 nm, and 1.2μm SiO2 thicknesses), nanocrystalline Fe/SiO2 (30-50 nm, SiO2 thicknesses), and nanocrystalline FeCo/SiO2 (30-50 nm, SiO2 thicknesses), showed a microstructure with SiO2 shell debris distributing in bulk formed by Fe and FeCo. This microstructure cannot provide separation of the conductive magnetic alloy particles from each other, still less than the insulation to diminish the eddy current. The formation of this microstructure is explained by the mismatch of the thermal expansion coefficients of the Fe and FeCo in the core and the SiO2 in the shell of the composite powders. This explanation is supported by the SEM/EDS experiments results performed on as-received Fe/SiO2 (1.2μm SiO2 thicknesses) powder, Fe/SiO2 powder (1.2μm SiO2 thicknesses) pressed at room temperature, and Fe/SiO2 powder (1.2μm SiO2 thicknesses) encapsulated in an ampoule of Ar atmosphere and annealed at 400oC for 1 hour. Formation of cracks is found on the 400oC annealed Fe/SiO2 (1.2μm SiO2 thicknesses) powder but not seen on the as-received and room temperature 25 MPa pressed powders. By performing a `back-of-the-envelope' calculation on the SiO2 thickness and dielectric strength, the possibility of the destruction of the SiO2 shell due to the electric field in the FAST consolidation is precluded. The possible solutions to the issue are to use pliable shell material and by further increasing the content of the shell material. The possible solutions tested by the consolidation of the FeCo/BN nanosheet (1wt.%, 3wt.%, and5 wt.% BN nanosheet contents), and the FeCo/MnZn ferrite (5.01wt.%, 7.33wt.%, 11.56wt.%, and 17.10wt.% MnZn ferrite contents). Microstructure with FeCo phases separated by the matrix formed by the shell materials has been achieved. The FeCo/MnZn ferrite core/shell powders were also used to develop the full exchange-coupled bulk composite compact. A reaction between FeCo and the MnZn ferrite, which results in a rock salt phase with poor magnetic properties, was observed. The thermodynamics of the reaction has been investigated and revealed a driving force of 10 ~ 21 kJ/mol for MnxZn1-xFe2O4 (0
Download or read book Advances in Powder Metallurgy written by Isaac Chang and published by Elsevier. This book was released on 2013-08-31 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Powder metallurgy (PM) is a popular metal forming technology used to produce dense and precision components. Different powder and component forming routes can be used to create an end product with specific properties for a particular application or industry. Advances in powder metallurgy explores a range of materials and techniques used for powder metallurgy and the use of this technology across a variety of application areas. Part one discusses the forming and shaping of metal powders and includes chapters on atomisation techniques, electrolysis and plasma synthesis of metallic nanopowders. Part two goes on to highlight specific materials and their properties including advanced powdered steel alloys, porous metals and titanium alloys. Part three reviews the manufacture and densification of PM components and explores joining techniques, process optimisation in powder component manufacturing and non-destructive evaluation of PM parts. Finally, part four focusses on the applications of PM in the automotive industry and the use of PM in the production of cutting tools and biomaterials. Advances in powder metallurgy is a standard reference for structural engineers and component manufacturers in the metal forming industry, professionals working in industries that use PM components and academics with a research interest in the field. Discusses the forming and shaping of metal powders and includes chapters on atomisation techniques Highlights specific materials and their properties including advanced powdered steel alloys, porous metals and titanium alloys Reviews the manufacture and densification of PM components and explores joining techniques
Download or read book Ferrites and Ceramic Composites written by Rajshree B. Jotania and published by Trans Tech Publications Ltd. This book was released on 2013-05-27 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters BCI (WoS). The Ferrite term is used to refer to all magnetic oxides containing iron as major metallic component. Ferrites are very attractive materials because they simultaneously show high resistivity and high saturation magnetization, and attract now considerable attention, because of the interesting physics involved. Typical ferrite material possesses excellent chemical stability, high corrosion resistivity, magneto-crystalline anisotropy, magneto-striction, and magneto-optical properties. Ferrites belong to the group of ferrimagnetic oxides, and include rare-earth garnets and orthoferrites. Several new hard and soft ferrites, garnets and their composite systems have been developed during recent years, with very large potential applications, which include bio-sensors, targeted drug delivery, magnetic imaging pigments, anti radar coating, microwave components, transparent magnetic plastics, etc. From physical point of view, ferrites present an extremely interesting class of systems with challenging problems. Hence this special volume was prepared with focus on some of these topics of interest to university researchers and entrepreneurs in industry.
Download or read book Handbook of Magnetic Measurements written by Slawomir Tumanski and published by CRC Press. This book was released on 2016-04-19 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collecting state-of-the-art knowledge from information scattered throughout the literature, this handbook describes magnetic materials and sensors, the testing of magnetic materials, and applications of magnetic measurements. It presents an up-to-date, accessible account of modern magnetic measurement techniques. The book discusses the fundamentals of magnetism and covers contemporary magnetic materials and sensors. It also explores applications of magnetic diagnostics in medicine, magnetoarcheology, and magnetic imaging. An extensive list of references is included at the end of each chapter.
Download or read book Concise Encyclopedia of Magnetic and Superconducting Materials written by K.H.J. Buschow and published by Elsevier. This book was released on 2005-12-28 with total page 1361 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic and superconducting materials pervade every avenue of the technological world – from microelectronics and mass-data storage to medicine and heavy engineering. Both areas have experienced a recent revitalisation of interest due to the discovery of new materials, and the re-evaluation of a wide range of basic mechanisms and phenomena.This Concise Encyclopedia draws its material from the award-winning Encyclopedia of Materials and Engineering, and includes updates and revisions not available in the original set -- making it the ideal reference companion for materials scientists and engineers with an interest in magnetic and superconducting materials. - Contains in excess of 130 articles, taken from the award-winning Encyclopedia of Materials: Science and Technology, including ScienceDirect updates not available in the original set - Each article discusses one aspect of magnetic and superconducting materials and includes photographs, line drawings and tables to aid the understanding of the topic at hand - Cross-referencing guides readers to articles covering subjects of related interest
Download or read book Physics of Ferromagnetism 2e written by Soshin Chikazumi and published by Oxford University Press, USA. This book was released on 2009-04-30 with total page 669 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a textbook for graduate students and researchers who are interested in ferromagnetism. The emphasis is primarily on explanation of physical concepts rather than on a rigorous theoretical treatment.
Download or read book Modern Ferrite Technology written by Alex Goldman and published by Springer Science & Business Media. This book was released on 2006-09-28 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Revision of a classic reference on ferrite technology Includes fundamentals as well as applications Covers new areas such as nanoferrites, new high frequency power supply materials, magnetoresistive ferrites for magnetic recording
Download or read book Proceedings of 3rd International Conference and Expo on Ceramics and Composite Materials 2017 written by ConferenceSeries and published by ConferenceSeries. This book was released on with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: June 26-27, 2017 Madrid, Spain Key Topics : Ceramics and Glasses, Advanced Ceramic Materials, Ceramics and Composites, Composite Ceramic Materials, Ceramic Coatings, Advanced Materials and Technologies, Materials and Innovative Processing Ideas, Nanostructured Ceramics, Porous Ceramics, Sintering, Crystalline Materials, Ceramics Applications, Bioceramics and Medical Applications, Functional Ceramics and Inorganics, Ultra-High Temperature Ceramics, Entrepreneurs Investment Meet, Ceramic Compounds: Ceramic Materials, Ceramics in Biology and Medicine, Ceramic Industry and Environment, Non-oxide Ceramics, Nuclear Ceramics, Sols, Gels and Organic Chemistry,
Download or read book Magnetic Oxides and Composites written by Rajshree B. Jotania and published by Materials Research Forum LLC. This book was released on 2018-05-10 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book focuses on the relevant basic concepts of Magnetic oxides, as well as on synthesis routes and important applications of spinel ferrites, hexaferrites and magnetic oxide nanomaterials. Keywords: Magnetic Oxides, Spinel Ferrites, Hexaferrites, Magnetoelectric Ceramic Composites, Soft Ferrites, Nano-Size Spinel Ferrites, Magnetic Nanoparticles, Device Miniaturization.
Download or read book Development of Strontium Ferrite polyamide 12 Composites for Magnetic Devices Using Additive Manufacturing written by Maria Camila Belduque Correa and published by . This book was released on 2021 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Ferrite Magnetic Materials written by FERROXCUBE CORP OF AMERICA SAUGERTIES NY. and published by . This book was released on 1953 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ferrites and Ceramic Composites II written by Rajshree B. Jotania and published by Trans Tech Publications Ltd. This book was released on 2015-10-13 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: This special volume on Ferrites and Ceramic Composites II contains a wide range of issues pertaining to nanomaterials. The volume will be of special interest to scientists and researchers who deal with Nanoparticles. The book covers a wide range of topics: Nanoparticles Synthesis and Properties, Nanoferrites, Ferrite Fibres and Nanofibres, Biomedical Applications.
Download or read book Magnetic Properties of Metals and Alloys written by American Society for Metals and published by . This book was released on 1959 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
