Michael Gasik | Aalto University (original) (raw)

Papers by Michael Gasik

Research paper thumbnail of Design and Fabrication of Symmetric FGM Plates

Materials Science Forum, 2003

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Research paper thumbnail of Neutron Diffraction Studies of Functionally Graded Alumina/Zirconia Ceramics

Materials Science Forum, 2005

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Research paper thumbnail of Machining FGM: Residual Stresses Redistribution

ABSTRACT

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Research paper thumbnail of Optimization Sintering of Zirconia/Alumina Functionally Graded Material

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Research paper thumbnail of Modelling of processing of FGM bioimplants

Multiscale, Multifunctional and Functionally Graded Materials, 2010

ABSTRACT Bioimplants composed of metal and ceramic parts are recently widely used in medicine. It... more ABSTRACT Bioimplants composed of metal and ceramic parts are recently widely used in medicine. It was shown that properties of these implants might be substantially improved with functionally graded materials (FGM). In this work ceramics FGM are considered with emphasis on the optimal processing technique. For ceramic balls and liners of total hip replacement prosthesis optimal sintering procedure is very important irrespectively on the initially selected graded composition profile to get beneficial stresses distribution after sintering and assembling. Different examples are shown and influence of the sintering and gradient profile selection on final properties is discussed.

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Research paper thumbnail of Computer-Integrated Safe Design of FGM Component for Hip Replacement Prosthesis

Materials Science Forum, 2005

ABSTRACT

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Research paper thumbnail of Reduction of Biofilm Infection Risks and Promotion of Osteointegration for Optimized Surfaces of Titanium Implants

Advanced Healthcare Materials, 2011

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Research paper thumbnail of Corrosion Resistance of Homogeneous and FGM Coatings

Materials Science Forum, 2005

... 2Safety Technology Authority, Helsinki, Finland amarina.malinina@hut.fi, btina.sammi@tukes. f... more ... 2Safety Technology Authority, Helsinki, Finland amarina.malinina@hut.fi, btina.sammi@tukes. fi, cmgasik@pop.hut.fi ... Fig. 2 demonstrate that low-alumina homogeneous coatings have the worst corrosion resistance with a little difference between 0-75% alumina. ...

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Research paper thumbnail of Decomposition of mixed Mn and Co nitrates supported on carbon

Thermochimica Acta, 2005

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Research paper thumbnail of Rapidly solidified Fe-TiC composites: Thermodynamics and the peculiarities of microstructure formation in situ

Scripta Materialia, 1996

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Research paper thumbnail of Thermal analysis of eutectic reactions of white cast irons

Scandinavian Journal of Metallurgy, 2005

ABSTRACT

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Research paper thumbnail of Thermal expansion of silicon at temperatures up to 1100°C

Journal of Materials Processing Technology, 2009

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Research paper thumbnail of Committees and sponsors

Computer Physics Communications, 1989

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Research paper thumbnail of A constitutive model and FE simulation for the sintering process of powder compacts

Computational Materials Science, 2000

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Research paper thumbnail of Stress evolution in graded materials during densification by sintering processes

Computational Materials Science, 2002

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Research paper thumbnail of MnCo 2 O 4 Preparation by Microwave-Assisted Route Synthesis (MARS) and the Effect of Carbon Admixture

Chemistry of Materials, 2003

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Research paper thumbnail of Development and optimisation of hydroxyapatite-ß-TCP functionally gradated biomaterial

Journal of the Mechanical Behavior of Biomedical Materials, 2014

Use of hydroxyapatite (HAP) for biomaterials is widely established, often in a combination with t... more Use of hydroxyapatite (HAP) for biomaterials is widely established, often in a combination with titanium alloy substrates in orthopaedic and other implants. Porous HAP-based coatings undergo sintering and heat treatment processes to achieve proper level of density yet avoiding undesirable reactions and phase changes. Thermal expansion mismatch between constituents may also lead to cracking of the coating due to excessive thermal stresses. Thus control of mechanical properties and stress state in the coating during the whole processing cycle represents some challenges when trying to combine conflicting objectives. In this work a method of optimisation of mechanical behaviour of an FGM biomaterial coating or scaffold composed of HAP and beta-tricalcium phosphate (ß-TCP) is considered. For coating on titanium-based substrates which have anatase (TiO2) top layer, thermodynamic equilibrium was analysed and the "safe" compositional path was found to ensure preservation of original ceramic phases during processing. Experimental studies of HAP-TCP sintering kinetics of different compositions were carried out with dilatometry to obtain true shrinkage curves and thermal expansion functions. These data were integrated with thermo-mechanical calculations of stresses and strains in HAP-ß-TCP FGM during processing, which were optimised with respect to minimal stresses, stresses derivatives and curvatures. The beneficial effect of compositional gradation on behaviour of these materials is shown.

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Research paper thumbnail of Titanium implants with modified surfaces: Meta-analysis of in vivo osteointegration

Materials Science and Engineering: C, 2015

Titanium-based implants are widely used in modern clinical practice, but their &a... more Titanium-based implants are widely used in modern clinical practice, but their "optimal" properties in terms of porosity and topology, roughness and hydrophilic parameters are being a subject of intensive discussions. Recent in vitro results have shown a possibility to optimize the surface of an implant with maximal repelling of bacteria (Staphylococcus aureus, Staphylococcus epidermidis) and improvement in human osteogenic and endothelial cell adhesion, proliferation and differentiation. In this work, these different grades titanium implants were tested in vivo using the same analytical methodology. In addition to material parameters, key histomorphometrical parameters such a regeneration area, bone adaptation area and bone-to-implant contact were determined after 2 and 4weeks of implantation in rabbit animal model. Porous implants have more clear differences than non-porous ones, with the best optimum values obtained on hydrothermally treated electrophoretically deposited titanium. These in vivo data correlate well with the optimal prediction made by in vitro tests.

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Research paper thumbnail of Design and Fabrication of Symmetric FGM Plates

Materials Science Forum, 2003

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Research paper thumbnail of Neutron Diffraction Studies of Functionally Graded Alumina/Zirconia Ceramics

Materials Science Forum, 2005

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Research paper thumbnail of Machining FGM: Residual Stresses Redistribution

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization Sintering of Zirconia/Alumina Functionally Graded Material

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Modelling of processing of FGM bioimplants

Multiscale, Multifunctional and Functionally Graded Materials, 2010

ABSTRACT Bioimplants composed of metal and ceramic parts are recently widely used in medicine. It... more ABSTRACT Bioimplants composed of metal and ceramic parts are recently widely used in medicine. It was shown that properties of these implants might be substantially improved with functionally graded materials (FGM). In this work ceramics FGM are considered with emphasis on the optimal processing technique. For ceramic balls and liners of total hip replacement prosthesis optimal sintering procedure is very important irrespectively on the initially selected graded composition profile to get beneficial stresses distribution after sintering and assembling. Different examples are shown and influence of the sintering and gradient profile selection on final properties is discussed.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Computer-Integrated Safe Design of FGM Component for Hip Replacement Prosthesis

Materials Science Forum, 2005

ABSTRACT

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Research paper thumbnail of Reduction of Biofilm Infection Risks and Promotion of Osteointegration for Optimized Surfaces of Titanium Implants

Advanced Healthcare Materials, 2011

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Research paper thumbnail of Corrosion Resistance of Homogeneous and FGM Coatings

Materials Science Forum, 2005

... 2Safety Technology Authority, Helsinki, Finland amarina.malinina@hut.fi, btina.sammi@tukes. f... more ... 2Safety Technology Authority, Helsinki, Finland amarina.malinina@hut.fi, btina.sammi@tukes. fi, cmgasik@pop.hut.fi ... Fig. 2 demonstrate that low-alumina homogeneous coatings have the worst corrosion resistance with a little difference between 0-75% alumina. ...

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Research paper thumbnail of Decomposition of mixed Mn and Co nitrates supported on carbon

Thermochimica Acta, 2005

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Research paper thumbnail of Rapidly solidified Fe-TiC composites: Thermodynamics and the peculiarities of microstructure formation in situ

Scripta Materialia, 1996

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Research paper thumbnail of Thermal analysis of eutectic reactions of white cast irons

Scandinavian Journal of Metallurgy, 2005

ABSTRACT

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Research paper thumbnail of Thermal expansion of silicon at temperatures up to 1100°C

Journal of Materials Processing Technology, 2009

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Research paper thumbnail of Committees and sponsors

Computer Physics Communications, 1989

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Research paper thumbnail of A constitutive model and FE simulation for the sintering process of powder compacts

Computational Materials Science, 2000

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Research paper thumbnail of Stress evolution in graded materials during densification by sintering processes

Computational Materials Science, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of MnCo 2 O 4 Preparation by Microwave-Assisted Route Synthesis (MARS) and the Effect of Carbon Admixture

Chemistry of Materials, 2003

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Research paper thumbnail of Development and optimisation of hydroxyapatite-ß-TCP functionally gradated biomaterial

Journal of the Mechanical Behavior of Biomedical Materials, 2014

Use of hydroxyapatite (HAP) for biomaterials is widely established, often in a combination with t... more Use of hydroxyapatite (HAP) for biomaterials is widely established, often in a combination with titanium alloy substrates in orthopaedic and other implants. Porous HAP-based coatings undergo sintering and heat treatment processes to achieve proper level of density yet avoiding undesirable reactions and phase changes. Thermal expansion mismatch between constituents may also lead to cracking of the coating due to excessive thermal stresses. Thus control of mechanical properties and stress state in the coating during the whole processing cycle represents some challenges when trying to combine conflicting objectives. In this work a method of optimisation of mechanical behaviour of an FGM biomaterial coating or scaffold composed of HAP and beta-tricalcium phosphate (ß-TCP) is considered. For coating on titanium-based substrates which have anatase (TiO2) top layer, thermodynamic equilibrium was analysed and the "safe" compositional path was found to ensure preservation of original ceramic phases during processing. Experimental studies of HAP-TCP sintering kinetics of different compositions were carried out with dilatometry to obtain true shrinkage curves and thermal expansion functions. These data were integrated with thermo-mechanical calculations of stresses and strains in HAP-ß-TCP FGM during processing, which were optimised with respect to minimal stresses, stresses derivatives and curvatures. The beneficial effect of compositional gradation on behaviour of these materials is shown.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Titanium implants with modified surfaces: Meta-analysis of in vivo osteointegration

Materials Science and Engineering: C, 2015

Titanium-based implants are widely used in modern clinical practice, but their &a... more Titanium-based implants are widely used in modern clinical practice, but their "optimal" properties in terms of porosity and topology, roughness and hydrophilic parameters are being a subject of intensive discussions. Recent in vitro results have shown a possibility to optimize the surface of an implant with maximal repelling of bacteria (Staphylococcus aureus, Staphylococcus epidermidis) and improvement in human osteogenic and endothelial cell adhesion, proliferation and differentiation. In this work, these different grades titanium implants were tested in vivo using the same analytical methodology. In addition to material parameters, key histomorphometrical parameters such a regeneration area, bone adaptation area and bone-to-implant contact were determined after 2 and 4weeks of implantation in rabbit animal model. Porous implants have more clear differences than non-porous ones, with the best optimum values obtained on hydrothermally treated electrophoretically deposited titanium. These in vivo data correlate well with the optimal prediction made by in vitro tests.

Bookmarks Related papers MentionsView impact