Porosity Behaviour of Insulated Iron Powder Compounds

Bidulská, Jana; Bidulský, Róbert; Petroušek, Patrik; Fedoriková, Alica; Katreničová, Ivana; Pokorný, Imrich

doi:10.12693/aphyspola.131.1384

Cited by 4 publications

(4 citation statements)

References 14 publications

(17 reference statements)

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“…the dimensional characteristic D circle (representing the diameter of the equivalent circle showing the same area as the metallographic cross-section of the pore) and aspect ratio A (representing the ratio between the major axis and minor axis of an ellipse equivalent to pore) according to [21][22][23]. the aspect ratio considers the stress and the strain situation in the process of AM.…”

Section: Methodsmentioning

confidence: 99%

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Archives of Metallurgy and Materials

Bidulský,

Petroušek,

Bidulská

et al. 2021

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The main aim of the present paper is to evaluate the porosity and mechanical properties of Ti6Al4v and CoCrW alloys produced by Laser Powder Bed Fusion (L-PBF) as an additive manufacturing (AM) technology. Ti6Al4v and CoCrW alloys are attractive for medical application. the complex examination of porosity for these alloys needs the quantification of morphological and dimensional characteristics. Quantification of porosity was realized on non-etched samples. Quantitative image analysis was used to describe the dimensional and morphological porosity characteristics. the pores were evaluated by image pro plus software. the results show the significant inhomogeneity of the morphology and distribution, as well as the pore size in the investigated materials and underline the importance of pore structure for the controlling mechanism of the mechanical response.

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Section: Methodsmentioning

confidence: 99%

“…the metal powder was mixed with a binder which is then spread over patterned masks and cured layer by layer. therefore, a complex examination of porosity needs the quantification of morphological and dimensional characteristics, mainly if the proposed based alloys are used in dental applications [23].…”

mentioning

confidence: 99%

Archives of Metallurgy and Materials

Bidulský,

Petroušek,

Bidulská

et al. 2021

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“…Additionally, porosity induces non-uniform stress distribution in SMCs, thereby decreasing the load-bearing area. This increases iron loss due to plastic deformation during compression molding [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Study on Compressibility According to Mixing Ratio and Milling Time of Fe-6.5wt.%Si

Kim,

Lee

2024

Materials

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Recently, researchers have focused on improving motor performance and efficiency. To manufacture motors with performance and efficiency higher than those of motors manufactured through the additive process, compressibility verification through the parameter control of soft magnetic composites (SMCs) is essential. To this end, this study aims to select suitable powders for manufacturing high-performance, high-efficiency motors by exploring powder mixing ratios and milling times. Through physical property tests, the optimal mixing ratio is predicted using the Multi-Particle Finite Element Method (MPFEM) and powder compression molding analysis, and compressibility is predicted in view of the influence of a change in particle size as a function of the powder mixing ratio and milling time. In addition, based on the result of a comparative analysis of density through experiments and an analysis of internal defects through SEM, a 50:50 mixing ratio of hybrid atomizing and gas atomizing powders milled for 3 h provided the best compressibility. Therefore, the use of SMC cores fabricated using powder compression molding is expected to improve motor performance and efficiency.

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“…The granulometry of the powders [19,20] and the number of pores [21] in the final component are critical parameters in the SMC mixes. As for the latter, it is well known [22][23][24] that pores act as crack initiators.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

et al. 2021

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During the past 50 years, the aim to reduce the eddy current losses in magnetic cores to a minimum led to the formulation of new materials starting from electrically insulated iron powders, today called Soft Magnetic Composites (SMC). Nowadays, this promising branch of materials is still held back by the mandatory tradeoff between energetic, electrical, magnetic, and mechanical performances. In most cases, the research activity focuses on the deposition of an insulating/binding layer, being one of the critical points in optimizing the final composite. This insulation usually is achieved by either inorganic or organic layer constituents. The main difference is the temperature limit since most inorganic materials typically withstand higher treatment temperatures. As a result, the literature shows many materials and process approaches, each one designed to meet a specific application. The present work summarizes the recent advances in state of the art, analyzing the relationship among material compositions and magnetic and mechanical properties. Each coating shows its own processing sets, which vary from simple mechanical mixing to advanced chemical methods to metallurgical treatments. From state of the art, Aluminum coatings are characterized by higher current losses and low mechanical properties. In contrast, higher mechanical properties are obtained by adopting Silicon coatings. The phosphates coatings show the best-balanced overall properties. Each coating type was thoroughly investigated and then compared with the literature background highlighting. The present paper thus represents a critical overview of the topic that could serve as a starting point for the design and development of new and high-performing coating solutions for SMCs. However, global research activity continuously refines the recipes, introducing new layer materials. The following steps and advances will determine whetherthese materials breakthrough in the market.

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Porosity Behaviour of Insulated Iron Powder Compounds

Cited by 4 publications

References 14 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Study on Compressibility According to Mixing Ratio and Milling Time of Fe-6.5wt.%Si

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

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