N Cimpoeşu's research while affiliated with Gheorghe Asachi Technical University of Iasi and other places

Publications (5)

Article
Copper-based alloys with the addition of Al present excellent properties and can be considered a proper choice for applications as contact materials based on their good strength and fret resistance. Cu-Al alloys are used in different systems parts as bearings, gears and worm gears. The intention is to replace steel materials with new copper-based m...
Article
In the present paper, a Ni-37Ti-15Ta (wt.%) shape memory alloy was analyzed in as-cast and hot-rolled conditions, by differential scanning calorimetry, scanning electron microscopy coupled with energy-dispersive spectroscopy, x-ray diffraction and electrochemical tests into a simulated body fluid (SBF). Both processing states experienced reversible...
Article
Full-text available
3D-printing technology is part of the large group of additive manufacturing methods that present a huge potential for increase the number of new application areas in manufacturing industries. Nowadays 3D printing is only implemented in several practical applications as 3D printer farm. In all the materials applications, plastic, cellulose or metall...
Article
Full-text available
In the last 5-10 years the process of 3D printing has an incredible advanced in all the fields with a tremendous number of applications. Plastic materials exhibit highly beneficial mechanical properties while delivering complex designs impossible to achieve using conventional manufacturing. In this article the printing process (filling degree, time...
Article
Full-text available
The class of biomaterials (metallic, polymer or ceramics) has applications as implants with a temporary function. Among magnezium (high corrosion rate) and iron (slow corrosion rate) based biodegradable alloys a new class based on zinc try to fullfill the gap between the first two alloy systems concerning the degradation rate. The role of these all...

Citations

... Shape memory alloys are stimulus-responsive materials with two universal properties: superelasticity and shape memory effect [7,8]. The occurrence of martensite-to-austenite and austenite-to-martensite transitions gives rise to shape memory and superelastic responses [9,10]. ...
... At European level, according to statistics, around 26 million tons of plastic are generated every year, 80% of which is dumped in water (rivers, lakes, seas, and oceans). To implement the proposed solutions as efficiently as possible, Romania has adopted Directive (EU) 2019/904 on the reduction of the environmental impact of certain plastic products [12]. According to the European Directive, among the single-use plastic products that are considered for recycling or even reuse is the following: fishing gear; beverage bottles and bottle caps; chopsticks, chip packets, wet wipes, sanitary napkins, cutlery, straws, drink stirrers, drinking glasses, food containers [2]. ...
... The electrolyte consisted of a silicate solution (10 g/L Na2SiO3, 5 g/L KF and 2 g/L NaOH) and a phosphate solution (10 g/L Na3PO4, 5 g/ L KF and 2 g/L NaOH) with the addition of 10 g/L nano-sized ZnO particle with average particle size of 50 nm. XRD phase analysis showed the [27,28]. Data also show ZnO NPS being inertly incorporated into the PEO coating which results in low porosity surfaces and enhanced corrosion resistance, also having a major impact on coating's microstructure, morphology and phase composition [29]. ...
... Therefore, taking into account the mechanical properties, homogeneity of biodegradation and cytotoxicity typical of most Zn-Mg binary alloys intended as an initial material for biodegradable implants, a combination of cast material with subsequent forming has been sought as a solution in recent years. Several papers on biodegradable Zn-Mg binary alloys have been published in last two years concerning second phases and their significant influences on alloy properties [11], inhibition of twinning by the refined Mg 2 Zn 11 intermetallic phase [12], ultra-low concentration of Mg 0.08 wt% as the alloying element for potential biodegradable material for stent applications [13], contribution of work hardening, dynamic recrystallisation softening and grain boundary strengthening in the mechanical properties evolution, changing in a wide range of strength and elongation [14], Zn-Mg binary alloys as a suitable solution for medical or industrial applications of degradable materials that provide corrosion degradation periods ranging from those given by magnesium alloys and those derived from iron-based alloys [15,16] and the design and synthesis of microalloying Zn-Mg biodegradable metals with improved mechanical properties, which relies on the synergetic effects of both grain refinement and fast cooling [17]. A comprehensive review by Venezuela and Dargusch [18] summarizes the influence of alloying and fabrication techniques on the mechanical properties, biodegradability and biocompatibility of zinc and zinc alloys. ...