Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"Barbara Lisiecka"

Characterization of the Cr3C2-NiAl coatings on sintered duplex stainless steels DOI:10.15199/28.2018.3.2

  The extremely interesting technology used for production of structural materials from metallic powders as a result of processes of forming and sintering is powder metallurgy (PM). This method allows to modify chemical composition in a very wide range which gives the possibility of production duplex steel with a varied microstructure [1, 2]. In the case of sintered duplex stainless steel (SDSS), it is possible to obtain a structure with different proportions of the basic structural components, i.e. austenite and ferrite. Taking into account high mechanical strengths, high toughness and good corrosion resistance, the SDSSs are used in industry, especially in highly industrialized countries [3÷6]. One of the most commonly used techniques to improve surface properties of steel are the coating processes or surface treatments [7, 8]. An interesting surface modification is the formation of coating based on chromium carbide. Chromium carbides have three polymorphic structures: the cubic (Cr23C6), the hexagonal (Cr7C3) and the orthorhombic (Cr3C2). In view of the best mechanical properties and appropriate adhesion to substrate, Cr3C2 is well-known chromium carbide [9, 10]. The chromium carbide coatings are widely used in high temperature applications (i.e. shaft bearings, seals, high-temperature furnaces, nozzles and metal machining moulds) because they present unique corrosion resistance and are characterized by higher hardness and strength than other carbides at such temperature. These coatings can be produced using electron beam physical vapour deposition (EB-PDV), atmospheric plasma spraying (APS) and high velocity oxy fuel (HVOF) [11÷13]. The method that enjoys unflagging interest is atmospheric plasma spraying (APS). In plasma spraying process, the powder (e.g. Cr3C2) is introduced into the plasma jet, which issue from a plasma torch. In the jet the powder is melted and propelled towards a substrate, where the formed a deposits [...]

Corrosion resistance of composites Ti-6Al-4V/Al2O3 obtained by spark plasma sintering DOI:10.15199/40.2016.7.3

  Attempts to develop materials for manufacturing of medical implants which combine biocompatibility, porosity and certain strength parameters involve substantial difficulties. One of the most recent materials are metallic-ceramic composites that show strength parameters connected with high bioactivity of various materials. This paper presents an analysis of the structure and corrosion resistance of new composites of Ti-6Al-4V with various additions of ceramics (Al2O3). Keywords: metallic-ceramic composites, SPS Odporność korozyjna kompozytów Ti-6Al-4V/Al2O3 otrzymanych metodą SPS Próby opracowania materiałów do produkcji implantów medycznych, które łączą parametry biozgodności, porowatość oraz odpowiednie parametry wytrzymałościowe zwiazane są z poważnymi trudnościami. Jedną z najnowszych propozycji materiałowych są kompozyty metaliczno-ceramiczne łączące własności wytrzymałościowe wraz z wysoką bioaktywnością różnego typu materiałów. W niniejszym artykule zaprezentowano analizę struktury oraz odporności korozyjnej nowych kompozytów Ti6Al4V z różnym dodatkiem ceramiki (Al2O3). Słowa kluczowe: kompozyty metaliczno-ceramiczne, SPS.1. Introduction Due to the sedentary lifestyles and ageing of population, contemporary societies are exposed at risk of degenerative bone diseases and muscle and joint problems. Therefore, the demand for medical products made of ceramics, polymers and metallic materials is increasing [3]. The progressing civilization development also encourages the research on new solutions for engineering materials. The most effective and relatively new metal materials for biomedical applications are titanium and its alloys, which were initially designed for the army and aviation and have been gradually modernized and used as titanium biomaterials [2, 5, 8]. Titanium and its alloys represent modern and prospective implantation materials [13]. The use of these compounds is increasing due to unique functional properties, such [...]

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