BrainMap

Gyorgy Thalmaier

- UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA

Teaching staff

Web of Science ResearcherID: A-7529-2012

Expertise & keywords

Fibres based soft magnetic composites prepared by cold pressing and spark plasma sintering Call name: P 1 - SP 1.1 - Proiecte de cercetare pentru stimularea tinerelor echipe independente
PN-III-P1-1.1-TE-2016-0649 2018 - 2020

Role in this project:

Coordinating institution: UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA

Project partners: UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA (RO)

Affiliation: UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA (RO)

Project website: https://neamtubogdan.wixsite.com/fsmc

Abstract:

The aim of this project is to develop a new family of SMC that is Fibres based Soft Magnetic Composites (FSMC). The main idea consists in the replacement of ferromagnetic particles by long and thin Fe fibres (ranging from few cm to tens of cm). This new family of materials should have lower core losses as compared to magnetic cores based on Fe-Si laminates and higher magnetic permeability and mechanical strength as compared to SMC`s. Pure Fe fibres available under the form of iron wool will be used. The Fe fibres will be covered by an insulating layer, compacted into toroidal shapes and then characterised from morphological, chemical, mechanical and electromagnetic point of view. Concerning the insulating layer, we propose a systematic approach that will lead to three different FSMC compacts: (i) compacts prepared from Fe fibres coated with silicon-based resin cold pressed; (ii) compacts prepared by fibres coated by a hybrid insulating layer that consist of an inorganic layer (phosphate, surface oxidised, SiO2) and a silicon-based resin layer. The two coatings should complement each other; (iii) spark plasma sintered (SPS) compacts based on Fe fibres coated with NiZn or MnZn ferrites. The use of ferrites as the coating material is justified by their high electrical resistivity and the fact that they have also magnetic properties. In such a case, the loss of magnetic permeability and saturation induction that is induced by insulating layer in classic SMC is partially eliminated. As compaction techniques, we propose uniaxial cold pressing (for first two types of compacts) and SPS (for the third type). SPS will be used to produce high-density compacts and to reduce/eliminate the reaction of the ferrite shell with the Fe core. It will be investigated the influence processing parameters on the electromagnetic characteristics of the compacts (permeability, core loss, saturation induction, coercivity, cutting frequency etc.) and mechanical strength.

Improving "eco-friendly" ceramic blocks fabrication technology Call name: P 2 - SP 2.1 - Transfer de cunoaștere la agentul economic „Bridge Grant”
PN-III-P2-2.1-BG-2016-0203 2016 - 2018

Role in this project:

Coordinating institution: UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA

Project partners: UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU TEHNOLOGII IZOTOPICE SI MOLECULARE I N C D T I M (RO); CEMACON - S.A. (RO)

Affiliation: UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA (RO)

Project website: https://constructii.utcluj.ro/files/2016-2017/bridge_grant/

Abstract:

The project is set to improve the ceramic material produced by CEMACON Zalau Company, by optimizing the existing technology of fabrication in order to reduce the energy demand in operation and implicitly the embodied energy in nZEBs.

The target is to improve both, the thermal characteristics and cost, by adding recycled materials and pore generating additives into the fabrication recipes. In the first stage, the basic raw materials that compose the ceramic masonry blocks will be analyzed from microstructural point of view. In the second stage, the microstructural, thermal and mechanical characteristics of some reference samples produced by CEMACON Company following the existing fabrication recipes will be defined. In the third stage the existing recipes will be optimized and the newly obtained products will be analyzed from thermal and physical-mechanical point of view. The improvement of quality control will be targeted by developing a methodology able to identify the structural deficiencies of the ceramic blocks through synchronous thermography detection. In the last stage, cost-benefit and environmental impact analyses will be performed, following the anti-seismic design regulations and the nZEB standards.

FILE DESCRIPTION	DOCUMENT
List of research grants as project coordinator or partner team leader
Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects