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Purpose: The article focuses on the production of polymer nanofibres from poly(lactic acid) using the electro-spinning method, i.e. the technique of forming fibres in an electrostatic field. The main aim of the publication was to analyse the influence of the distance between electrodes on the morphology of one-dimensional polymeric materials obtained. Design/methodology/approach: In the practical...
Purpose: The aim of this study was to present the influence of mass concentration of the reinforcement phase on the structure and optical properties of the obtained composite thin films with a polymer matrix reinforced by SiO2, TiO2 and Bi2O3 nanoparticles, produced by the spin-coating method. Design/methodology/approach: To produce composite materials, 10% wt. polymer solutions of polyacrylonitrile...
Purpose: The aim of the work is to present the results of own investigations concerning the geometric optimisation of constructional elements working in the environment of cavitation wear together with a computer numerical analysis. The engineering material used for constructional elements working in the environment of cavitation wear is steel, commonly used for pressure devices working at elevated...
Purpose: In the present study, the effect of ECAP die and number of ECAP pressings on the structure evolution and hardness of AlMg3 aluminium alloy was investigated. Design/methodology/approach: Commercial AlMg3 aluminium alloy in the as-cast condition was processed by Equal Channel Angular Pressing method through route A using two different ECAP dies – conventional and modified with additional twist...
Purpose: In the present study, the effect of ECAP die and number of ECAP pressings on the structure evolution and hardness of AlMg3 aluminium alloy was investigated. Design/methodology/approach: Commercial AlMg3 aluminium alloy in the as-cast condition was processed by Equal Channel Angular Pressing method through route A using two different ECAP dies – conventional and modified with additional twist...
Purpose: Main purpose of the paper is results share of AlSi9Cu and AlSi9Cu4 cast aluminium alloys treatment investigation. Processing was performed using CAE-PVD method in order to obtain gradient coatings. Design/methodology/approach: CAE-PVD method was used to obtain gradient coatings on AlSi9Cu and AlSi9Cu4 cast aluminium alloys after heat treatment. Investigation of resulting material was performed...
Purpose: The investigations have been carried out on test pieces of 316L stainless steel parts fabricated by Selective Laser Sintering technique. The effect of selective laser sintering parameters such as power output, laser distance between the points sintered metal powder during additive manufacturing as well as the orientation of models relative to the laser beam and substrate on the roughness,...
Purpose: This work presents the research results on the structure of gradient/monolithic coatings (Ti/Ti(C,N)/CrN, Cr/CrN/TiN) deposited onto the magnesium alloy substrate by cathodic arc evaporation method. Design/methodology/approach: The investigations were performed using scanning and transmission electron microscopy (with different image techniques) for the microstructure determination. The morphology...
Purpose: This work present experimental determination of the elastic-plastic condition of the magnesium alloy depending on the temperature and pace of the sample tensile stress. Design/methodology/approach: At the acoustic emission (next denoted the „AE”) use, tensile tests at high temperatures may, among other things, be used for analysis of the AE signal sources and set, in more detail, the temperature...
Purpose: The presented paper deals with method for determination of mean flow stress (MFS) which contributes to better knowledge of forming processes of hot formed magnesium alloys. Design/methodology/approach: An experiment leading to obtaining the model of the mean flow stress (MFS) of magnesium alloy AZ31 was realized in laboratory rolling mill. It resulted from mathematical and statistical processing...
Purpose: This article presents results of investigation of laser alloyed cast aluminium alloys after standard heat treatment. In general into the aluminium matrix there are fed different types of ceramic particles including aluminium oxide. The purpose of this work was also to determine the laser treatment conditions for surface hardening of the investigation alloys, like laser power, as well the...
Purpose: The goal of this work is to determine residual stresses of coats obtained in PVD and CVD process with the use of finite elements method and comparative analysis with results obtained by laboratory investigations. Design/methodology/approach: Article introduces the usage of finite elements method for simulation of stresses measurement process in Ti/Ti(C,N)/CrN, Ti/Ti(C,N)/(Ti,Al)N, Ti/(Ti,Si)N/(Ti,Si)...
Purpose: Scanning electron microscopy and light microscopy with polarization has been used for observation cross sectioned samples of nanocomposites with developed layered region, visible in the polarized light; Purpose of this work was to focus on investigation of nanocomposites, with polyolefin matrix and nanometric 2:1 silicate reinforcement, as future engineering materials, Design/methodology/approach:...
Purpose: The aim of this paper was investigated structure and properties of gradient coatings produced in PVD process on AlSi9Cu aluminium alloys. Design/methodology/approach: The following results concern the structures of the substrates and coatings with the application of electron transmission and scanning microscopy; phase composition of the coatings using X-ray diffraction and grazing incident...
Purpose: The aim of this work was to predict the mechanical properties of the cast magnesium alloys of the MCMgAl12Zn1, MCMgAl9Zn, MCMgAl6Zn and MCMgAl3Zn type, by appliance of artificial neural networks. Design/methodology/approach: In this work there were performed investigations concerning the influence of chemical composition of the Mg-Al-Zn alloys onto the structure and mechanical properties,...
Purpose: There are presented in this paper the investigation results of microstructure of the cast aluminium alloys in the as cast state as well after laser treatment used for alloying with carbide and oxide ceramic powders like aluminium oxide and silicon carbide, titanium carbide, vanadium carbide and tungsten carbide. The purpose of this work was also to determine the laser treatment conditions...
Purpose: The aim of this work was to improve the properties of the surface layer of the MCMgAl12Zn1 cast magnesium alloy. This improvement can be achieved by modification of surface layer microstructure by melting and simultaneous feeding the silicon carbide particles into the weld pool. Design/methodology/approach: Laser alloying of the MCMgAl12Zn1 magnesium alloy with the silicon carbide was carried...
Purpose: The purpose of this paper is to assess the strategic perspectives of laser treatment of casting magnesium alloys such as MCMgAl12Zn1 MCMgAl9Zn1, MCMgAl6Zn1, MCMgAl3Zn1 using carbide TiC, WC, VC, SiC and Al2O3 oxide powders. The type of powder was taken as a criterion for the technology groups distinguishing in that way five groups of technologies for further research studies. Design/methodology/approach:...
Purpose: The aim of this work was to improve the surface layer cast magnesium cast alloys by laser surface treatment, determine the laser treatment parameters and examine structure and properties. Design/methodology/approach: The laser treatment of magnesium alloys with alloying SiC and TiC powders with the particles size below 75 μ m and over 6.4 μm was carried out using a high power diode laser...
Purpose: The aim of this work was to improve the surface layer cast magnesium cast alloys by laser surface treatment and determine the laser treatment parameters. Design/methodology/approach: The laser treatment of magnesium alloys with alloying SiC powder with the particle size below 75 μm was carried out using a high power diode laser (HPDL). The resulting microstructure in the modified surface...
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