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Individual implants of a loss of palate fragments fabricated using SLM equipment

Dobrzański L. A., Dobrzańska-Danikiewicz A., Gaweł T. G.

Journal of Achievements in Materials and Manufacturing Engineering

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2016

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Vol. 77, nr 1

24--30

EN

Purpose: The aim of the article is to present the new conception of design and manufacturing individual implants of a loss of palate fragments using Selective Laser Melting equipment. Design/methodology/approach: The designed virtual model of scaffolds have been produced in a process of selective laser melting (SLM). For their preparation titanium alloy powder - Ti6Al4V of suitable granulation and shape has been used. Thus obtained scaffolds have been observed in a scanning electron microscope. The structure of the pores is compatible with the shape of a designed unit cell. The outcarried EDS analysis has confirmed the chemical composition of the tested material. Findings: In the framework of research innovative porous biomimetic materials called scaffolds with the well-defined regular structure of open pores have been used. Virtual implant models have been made using Computer Aided Materials Design. They have the geometrical dimensions corresponding to a fragment of a loss of a human palate. Porous and regular structure with defined geometric dimensions and shape are designed in the form of the unit cell, which has then been subjected to the multiplication process. Practical implications: The scaffolds fabricated in the SLM process create conditions for their application as implants of a loss of palate fragments. Originality/value: Implants for the whole palate or its part, required due to mechanical injuries, tumorous diseases or cleft palate are original at the basis of a literature review.

2

Comparative analysis of mechanical properties of scaffolds sintered from Ti and Ti6Al4V powders

Dobrzański L. A., Dobrzańska-Danikiewicz A. D., Achtelik-Franczak A., Dobrzański L. B.

Archives of Materials Science and Engineering

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2015

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Vol. 73, nr 2

69--81

EN

Purpose: The aim of the article is to present and compare the results of studies into mechanical properties, including mainly tensile and compressive strength of scaffolds fabricated from Ti and Ti6Al4V in Selective Laser Sintering (SLS) for specific sintering conditions. Design/methodology/approach: Titanium scaffolds characterised by the different size of pores were fabricated on the basis of 3D CAD models of samples for tensile and compressive strength examinations prepared with AutoFab software for a selected unit cell. The so prepared samples were subject to tensile and compressive strength examinations with a universal tensile testing machine Zwick 020. Findings: The results of examinations of mechanical properties of pristine titanium and its alloy Ti6Al4 showing differences in the strength of the two materials and allowing to characterise each of them. The size of pores and the shape and manner of arrangement of a unit cell building the scaffold influences substantially the strength properties of titanium scaffolds. Practical implications: The scaffolds with specific strength properties fabricated in the SLS process create conditions for their application in dental engineering and in jaw-face reconstructions. Originality/value: The original results of tensile and compressive strength examinations of the created scaffolds. The innovative application of the rapid manufacturing technology for the purpose of regenerative medicine may greatly influence the development of this field of medicine.

3

Influence of selected parameters of Selective Laser Sintering process on properties of sintered materials

Stwora A., Skrabalak G.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 61, nr 2

375--380

EN

Purpose: Presented researches aimed at determining the influence of parameters of Selective Laser Sintering (SLS), such as: laser power, point distance, scanning speed and exposure time on the density and compression strength of sintered material. Design/methodology/approach: Researches were performed using EOS 250XT (with maximum laser power of 250 W) and Renishaw AM 250 (with maximum laser power of 400W) systems for additive manufacturing. Investigated material was EOS - DirectSteel H20. There was prepared plan of the experiment incorporating above mentioned parameters of the sintering process. According to the DOE, samples for 25 sets of parameters were built, and later on investigated in order to measure and observe their densities and compression strength. Findings: Results of the performed studies enabled to work out the basis of the methodology for finding and optimizing parameters of the SLS process depending on the optimization criteria (i.e. physic-mechanical properties of the sample, sintering time, quality of the sintered surface). Basing on the knowledge gained during performed investigations, it can be stated that the sintering technologies supplied by the manufacturers of additive manufacturing systems can be significantly improved by modifying selected parameters. Practical implications: As the additive manufacturing allows to produce almost any shape, without limits existing in case of subtractive machining methods, it might be applied in the tooling industry for manufacturing moulds for injection moulding. Results of performed studies will find its application in making moulds with conformal cooling channels of durability comparable with solid / base materials. Originality/value: Selective Laser Sintering and Selective Laser Melting processes the additive manufacturing methods, are booming with its possible application fields, however it is still limited due to the main limitations of the process concerning durability and strength of sintered elements. The paper presents approach and test methodology enabling relatively simple and low cost (due to not large number of samples) optimization of SLS process enabling reaching properties of sintered elements comparable with those built of solid materials.

4

Kształtowanie metodami przyrostowymi modeli użytkowych z tworzyw polimerowych

Zimniak P., Zimniak J.

Inżynieria i Aparatura Chemiczna

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2006

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Nr 3 sp.

98-100

EN

Some problems concerning shaping of plastic functional models and products have been revealed in the paper. The methods like stereolithography (SL) and selective laser sintering (SLS) have been analysed in details indicating their limitations and possibilities of further development.