Metallurgy and Foundry Engineering
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ISSN 1230-2325
e-ISSN: 2300-8377
Issue Date
2013
Volume
Vol. 39
Number
No. 1
Description
Journal Volume
Metallurgy and Foundry Engineering
Vol. 39 (2013)
Projects
Pages
Articles
Evaluation of microstructure of steel for the power industry by means of the triafole replica method
(2013) Gwoździk, Monika
The paper presents microstructures of steel designated for the operation at elevated temperatures in the power industry. Materials were examined both in the initial state as well as after the operation. The microstructure was examined using triafol replicas to determine the degree of materials wearing out. The quality of the structure representation on triafol replicas was checked, comparing them with the images from microsections. Attempts were made to improve the structure image quality on replicas through application of various degrees of microsection etching, and observation of unshaded and shaded replicas. The paper presents also most frequently encountered technological defects originating during replica preparation.
AL$_{2}$O$_{3}$-Me layers obtained by the electrochemical method
(2013) Dobosz, Iwona; Uhlemann, Margitta; Gumowska, Wanda
Fine membranes with controlled size of pores were produced by the two step anodizing process of the aluminium in oxalic acid solution. Highly ordered Co, Fe and CoFe nanowire arrays were prepared by two electrodeposition techniques: pulsed (PED) and potentiostatic electrodeposition (DC) into the anodic alumina membrane (AAM) templates. It has been observed that both experimental methods (PED, DC) enable the embedding of Co, Fe as well as CoFe alloy into the pores of the AAM with a high aspect ratio.
BTEX emissions from BioCo2 bonded moulding sands
(2013) Loch, Joanna; Grabowska, Beata; Kaczmarska, Karolina
The aim of the research was to determine the volume of BTEX emission (benzene, toluene, ethylbenzene and xylenes) from BioCo2 bonded moulding sands. BioCo2, a new polymer binder, is a water solution of two - component polymer composition (polyacrylic acid and dextrin). Research on gas emissions were performed according to the method developed at Faculty of Foundry Engineering, AGH University of Science and Technology. The measurement of BTEX samples adsorbed on activated carbon was made with the use of gas chromatography (GC-FID) and was followed by a qualitative and quantitative analysis. The research showed that the volume of BTEX emissions was lower in BioCo2 bonded moulding sand than in resin-bonded sand Kaltharz U404.
The reclamation of spent sand bonded by polymeric binder BioCo2
(2013) Grabowska, Beata; Kaczmarska, Karolina; Dańko, Rafał
The paper presents the results of studies on reclamation of moulding sand with a new polymeric binder BioCo2. The polymeric binder of new generation – BioCo2 – is an aqueous solution of two-component polymeric composition of poly(acrylic acid) and dextrin. The aim of research was to show whether can recover sand (reclaim) from the used sand. The properties for reuse as a component of moulding sand were discussed. Used sands and reclaim were subjected to analysis designed to show the degree of reclaimability. Assessment of process was based on the following indicators: the amount of dust released during reclamation, loss on ignition, WSR index and the surface morphology of the sand grains.
Structure and electrical properties of Sn8Zn solder alloy with Ag and Ga additions
(2013) Boczkal, Grzegorz; Perek-Nowak, Małgorzata
Solder joints based on eutectic SnZn alloy were studied. The influence of Ga and Ag was analysed and compared to the basic Sn8Zn alloy as well as to the reference solder alloys Sn60Pb40 and Sn3Cu. The formation of intermetallic layer in zinc-containing alloys made mainly out of Cu5Zn8 type was noted, while in the standard solder alloys it was Cu3Sn. The resistivity measurements showed the lowest value for Sn8Zn1Ag and the worst in the case of Sn8Zn1Ga, due to the quite different incorporation of Ag and Ga atoms in the solder: Ag atoms are found in precipitates while Ga atoms are dissolved in the matrix.