Browsing by Subject "graphite"

Now showing 1 - 8 of 8

Access status: Open Access ,
Badania mineralogiczne ceramiki grafitowej (?), przykład – stanowisko dolinne w Thunau am Kamp, Dolna Austria
(2017) Pawlikowski, Maciej ; Karwowski, Maciej
Artykuł prezentuje wyniki badań mineralogicznych i petrograficznych ceramiki grafitowej. Wykonano badania próbek ceramiki kultury lateńskiej pochodzących ze stanowiska dolinnego w Thunau am Kamp w Dolnej Austrii. Oprócz badań grafitu (?) z ceramiki archeologicznej wykonano badania węgli kamiennych wieku karbońskiego jako potencjalnego dodatku do mas garncarskich kultury lateńskiej. Wykonano także badania grafitów z czeskiego złoża w Czeskim Krumlovie. Przeprowadzono także badania współczesnych mas garncarskich wykonanych z dodatkami węgla, które to masy wypalono w 750oC zarówno w utleniającej jak i redukcyjnej atmosferze. W badaniach stosowano metody mikroskopii stereoskopowej, polaryzacyjnej jak też mikroskopii ramanowskiej.
Access status: Open Access ,
Effect of the cooling rate on the mottled cast iron microstructure designed for the mill rolls
(2009) Krawczyk, Janusz Ryszard; Pacyna, Jerzy
The influence of the cooling rate changes on the mottled cast iron microstructure was described in the paper. The investigated material constituted mottled cast iron, spheroidal, chromium-nickel. This cast iron, according to currently binding standards was marked GJS-HV300(SiCrNi2-3). The microstructure was described both qualitatively and quantitatively. The discussion of the formation mechanisms and their influence on the morphology of structural components and phases was conducted. The heat treatment was performed in such a way as to obtain either a pearlitic or a bainitic matrix as well as a different morphology of lederburitic cementite and graphite precipitates for the same matrix.
Access status: Restricted ,
Environment-friendly binders in carbon and graphite technology.
(Data obrony: 2018-09-26) Krzemiński, Tomasz
Wydział Inżynierii Materiałowej i Ceramiki
Access status: Open Access ,
The formation, properties and use of dispersed iron-graphite metallurgical waste
(AGH University Press, 2022) Dan, Leonid; Maslov, Vladimir; Trofimova, Larisa Alekseevna; Cios, Grzegorz
Dispersed wastes containing graphite, iron, and its oxides, getting into the air and accumulating in landfills, cause serious harm to human health and the environment. Moreover, even if the issue of the localization of these wastes has been solved successfully, their disposal has not yet been fully organized. In the present study, a systematic analysis of the dispersed iron-graphite waste (IGW) conditions for the formation at metallurgical enterprises, their structure, and their properties were carried out. In this case, special attention is focused on the electrophysical properties: specific saturation magnetization and volume resistivity. The presence of magnetic properties in IGW, combined with low electrical resistivity, makes IGW a promising and inexpensive raw material for obtaining cheap composite materials with radio shielding and radio absorbing properties in the microwave range. As a result of the research, effective ways of improving the magnetic properties of IGW by high-temperature treatment were obtained. The practical result of the research was the development and implementation of a technological scheme of dispersed IGW complex processing, which makes it possible to solve a twofold task - to exclude the ingress of iron-graphite wastes into the environment and to obtain a cheap material for protection against microwave radiation.
Access status: Open Access ,
The impact of graphite on the thermal conductivity of solidified grout
(Wydawnictwa AGH, 2017) Śliwa, Tomasz; Kowalski, Tomasz Wojciech; Stryczek, Stanisław; Wiśniowski, Daniel; Bieda, Anna; Piwowarczyk, Sara; Beszłej, Jan; Naklicki, Mateusz; Sapińska-Śliwa, Aneta
The fast development of low-temperature geothermal energy affects the search for newer and newer solutions and materials used in the construction of borehole heat exchangers. One of the most important factors affecting the correct operation of heat pump systems with borehole heat exchangers is appropriately selected solidified grout. Solidifies grout has to be characterized by the highest thermal conductivity and good sealing borehole heat exchangers. The paper will present the impact of graphite on the thermal conductivity of solidified grout.
Access status: Open Access ,
The role of metallurgical defects and microstructure on failure formation in roll necks of cast iron rolls
(2007) Krawczyk, Janusz Ryszard; Pacyna, Jerzy
This work presents the examples of structural reasons for failure of the necks of cast iron rolls. The most common reason for damage of metallurgical roll necks is a presence of shrinkage porosity in their volume. Moreover, a high fraction of ledeburitic cementite can lead to the formation of a continuous net of eutectic carbides, which facilitate cracking. Even very thin net of secondary carbides, formed on the boundaries of former grain of austenite, can significantly facilitate propagation of the crack. Continuous net of ledeburitic cementite, in the case of its precipitation in a form of bands and existence of hardened areas in the alloy matrix can lead to roll neck fracture relatively easy. The use of flake graphite cast iron for metallurgical rolls increases a risk of the fracture of roll neck.
Access status: Open Access ,
X-ray tomography imaging: a necessary tool for materials science
(Wydawnictwa AGH, 2006) Babout, Laurent
This paper gives an overview on different examples of X-ray tomography applications in the field of materials science. It highlights the necessity of applying the technique to investigate scientific problem which cannot be solved with conventional imaging tools.
Access status: Open Access ,
Złoża kopalin mineralnych Pobuża, środkowa Ukraina
(Wydawnictwa AGH, 2009) Pieczonka, Jadwiga; Piestrzyński, Adam
Pobuże area is a perspective for different mineral commodities. In this area, several genetically different deposits have been identified. In the Kapitanowski Massif chromites and Ni-silicate deposits occur. Tarasowskie Zr-Ti deposit is one of the biggest the alluvial deposit in Ukraina. Maiskoje, Au-deposit is more interesting within 21 targets discovered. Zawalje graphite deposit is a world class.