Magdalena Jażdżewska

Bio: Magdalena Jażdżewska is an academic researcher from Gdańsk University of Technology. The author has contributed to research in topics: Titanium alloy & Laser. The author has an hindex of 6, co-authored 16 publications receiving 79 citations.

Electrophoretic Deposition and Characterization of Chitosan/Eudragit E 100 Coatings on Titanium Substrate

Abstract: Currently, a significant problem is the production of coatings for titanium implants, which will be characterized by mechanical properties comparable to those of a human bone, high corrosion resistance, and low degradation rate in the body fluids This paper aims to describe the properties of novel chitosan/Eudragit E 100 (chit/EE100) coatings deposited on titanium grade 2 substrate by the electrophoretic technique (EPD) The deposition was carried out for different parameters like the content of EE100, time of deposition, and applied voltage The microstructure, surface roughness, chemical and phase composition, wettability, mechanical and electrochemical properties, and degradation rate at different pH were examined in comparison to chitosan coating without the addition of Eudragit E 100 The applied deposition parameters significantly influenced the morphology of the coatings The chit/EE100 coating with the highest homogeneity was obtained for Eudragit content of 025 g, at 10 V, and for 1 min Young’s modulus of this sample (2477 ± 550 GPa) was most comparable to that of human cortical bone The introduction of Eudragit E 100 into chitosan coatings significantly reduced their degradation rate in artificial saliva at neutral pH while maintaining high sensitivity to pH changes The chit/EE100 coatings showed a slightly lower corrosion resistance compared to the chitosan coating, however, significantly exceeding the substrate corrosion resistance All prepared coatings were characterized by hydrophilicity

Surface structure and properties of Ti6Al4V alloy laser melted at cryogenic conditions

Abstract: Purpose: The research work has been to determine whether surface melting of the Ti6Al4V bioalloy with the high power laser, when immersed in liquid nitrogen, would result in an appearance of hard and thick surface layer, containing new structural constituents. Design/methodology/approach: The laser melting of the Ti6Al4V alloy has been made by the CO2 laser at different laser beam energy and scan rate. The specimens have been immersed in liquid nitrogen bath during laser treatment. The Vickers microhardness of cross-sections of the surface layer has been measured, and the microscopic examinations have been performed with the SEM. Findings: The laser melting at cryogenic conditions has resulted in creation of the modified surface layer, up to 1.5 mm thick with HAZ, of properties and structures different from those of the base metal. The layer has been well adjacent to base metal, its microhardness being significantly higher. The numerous zones have been observed within the surface layer, with nitrogen-containing martensite and titanium nitride structures. The negative effect has been an initiation of surface cracks. The laser beam energy has influenced the presence of different zones, their thickness, and number of cracks. Research limitations/implications: So far research has shown that proposed technique can create thick and hard surface layer, containing new structural important components. The new research is necessary in order to establish the laser treatment parameters which permit to avoid cracking and determine the phase constituents and crystallinity within the surface layer. Practical implications: The elaborated technique may be useful in order to improve the surface properties of the Ti alloys for biomedical applications. Originality/value: The paper shows original in the world-scale results of laser treatment of the Ti bioalloy at cryogenic conditions.

Hydroxyapatite deposition on the laser modified Ti13Nb13Zr alloy

Abstract: Abstract The Ti13Nb13Zr alloy was subjected to laser modification with the Nd:YAG laser provided that such treatment would increase the surface roughness followed improved adhesion of hydroxyapatite (HAp) coatings The hydroxyapatite was deposited by electrophoretic method in suspension of 0.5 g HA powder and 100 ml ethyl alcohol. The deposition was carried out for 10 min at 10 V voltage followed by drying at room temperature for 24 h and heating at 800°C for 1 h in vacuum. The thickness of the HAp coatings was found as of about 4.06 μm to 9.05 μm. The examinations of surfaces were carried out at each stage of the experiment with the ultra-high resolution scanning electron microscope. The measurements of surface roughness after laser treatment and after HAp deposition were performed with the Hommel Etamic Waveline profilograph.

The Possibility Of Use Of Laser-Modified Ti6Al4V Alloy In Friction Pairs In Endoprostheses

Abstract: The purpose of this paper is to show results of laser treatment at cryogenic conditions of the Ti6Al4V alloy used for orthopedic applications. That modification process ought to bring beneficial changes of microstructure and residual stresses in the surface layer. The paper presents the abrasive wear of the base and laser remelted material in association with ceramics Al2O3. Despite the surface cracking after laser treatment the tribological properties in simulated body fluid have been substantially improved.

Cryogenic manufacturing processes

Abstract: Cryogenically assisted manufacturing processes are emerging as environmentally-benign, toxic-free, hazardless operations, producing functionally superior products. This paper presents an overview of major cryogenic manufacturing processes, summarizing the state-of-the-art and significant developments during the last few decades. It begins with a summary of historic perspectives, including definitions, scope, and proceeds to analysis of process mechanics and material performance covering tribological and thermo-mechanical interactions, followed by surface integrity, product quality and performance in cryogenic manufacturing. Process analysis and applications includes machining, forming and grinding. Economic, safety and health issues are then discussed. Finally, progress in developing predictive performance models and future outlook are presented.

Dentistry 4.0 Concept in the Design and Manufacturing of Prosthetic Dental Restorations

Abstract: The paper is a comprehensive but compact review of the literature on the state of illnesses of the human stomatognathic system, related consequences in the form of dental deficiencies, and the resulting need for prosthetic treatment. Types of prosthetic restorations, including implants, as well as new classes of implantable devices called implant-scaffolds with a porous part integrated with a solid core, as well as biological engineering materials with the use of living cells, have been characterized. A review of works on current trends in the technical development of dental prosthetics aiding, called Dentistry 4.0, analogous to the concept of the highest stage of Industry 4.0 of the industrial revolution, has been presented. Authors’ own augmented holistic model of Industry 4.0 has been developed and presented. The studies on the significance of cone-beam computed tomography (CBCT) in planning prosthetic treatment, as well as in the design and manufacture of prosthetic restorations, have been described. The presented and fully digital approach is a radical turnaround in both clinical procedures and the technologies of implant preparation using computer-aided design and manufacturing methods (CAD/CAM) and additive manufacturing (AM) technologies, including selective laser sintering (SLS). The authors’ research illustrates the practical application of the Dentistry 4.0 approach for several types of prosthetic restorations. The development process of the modern approach is being observed all over the world. The use of the principles of the augmented holistic model of Industry 4.0 in advanced dental engineering indicates a change in the traditional relationship between a dentist and a dental engineer. The overall conclusion demonstrates that it is inevitable and extremely beneficial to implement the idea of Dentistry 4.0 following the assumptions of the authors’ own, holistic Industry 4.0 model.