|Małgorzata Warmuzek, Łukasz Boroń, Adam Tchórz|
In this work the results of the application of different imaging techniques and image analysis systems for measurements of chosen either stereological parameters or geometrical features for some of morphology models occurring in the cast alloys, especially taking into account cast iron with either spheroidal or vermicular graphite have been compared and interpreted. The statistical important difference of the obtained results have been stated and recognized as caused first of all by quality of analyzed images and local geometry features of the analyzed objects. The results of the graphite particles classification according to the size class in the actual standard PN-EN ISO 945-1, using different imaging and analysis procedures.
Keywords: microstructure, image analysis, graphite, cast iron, stereological parameters, graphite classification,
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Piotr Drzymała, Piotr Długosz, Paweł Darłak
The first part of the publication presents the structure of global power industry market. Fundamental technologies of heat and electricity production in conventional coal combustion processes are considered,with special emphasis on waste manufacturing and storage. The article discusses prospects for possible utilization of fly ash in synthesis of metal matrix composites.
Keywords: power industry, coal, fly ash, waste economy, high temperature investigations, ALFA composites,
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Dariusz Rudnik, Natalia Sobczak, Andrzej Gazda, Marta Homa, Aleksandra Siewiorek, Krystyna Pietrzak, Katarzyna Makowska
This paper presents the results of measurements of thermophysical properties of automotive brake discs made from gray cast iron. The samples were tested before and after operation in the braking system. Thermal conductivity as a function of temperature was measured using one of the most advanced sets of apparatus LFA 427 (Laser Flash Apparatus) produced by Netzsch. Applying differential scanning calorimetry DSC and dilatometric technique the specific heat cp(T) and density d(T) were determined and used for the calculation of coefficients of thermal conductivity λ(T) using Netzsch LFA Analysis software. Investigations of thermophysical property allowed the identification of phase transformations occurring in solid state (eutectoidal reaction) and liquid (melting, the formation of phosphorus eutectic). Comparison of thermophysical properties for the two cast iron alloys (ST and NT) allowed to declare a slight reduction in thermophysical properties of ST, resulting from the exploitation process.
Keywords: thermal diffusivity, thermal conductivity, specific heat, DSC, Laser Flash Method, gray cast iron,
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Franciszek Pezarski, Irena Izdebska-Szanda, Elżbieta Smoluchowska, Roman Świder, Andrzej Pysz
The article presents the results of model tests and studies of the sand reclamation from waste moulding and core mixtures with an inorganic geopolymer binder, used in the trial production of pilot castings from aluminium alloys. Qualitative assessment of the obtained samples of the sand reclaim and of the post-reclamation waste was done, and possibilities of the reuse of the reclaim to replace fresh sand in the manufacture of moulding and core mixtures for aluminium castings were discussed. Guidelines were developed for the sand reclamation process from the waste moulding and core mixtures used in the production of aluminium alloy castings by small foundries.
Keywords: moulding sand, inorganic geopolymer binder, reclamation of waste moulding sand mixture, aluminium alloys,
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