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Verification of computer simulation in the field of thermal properties of foundry moulds
Šupa, Jan ; Rusín, Karel (referee) ; Cupák, Petr (advisor)
This diploma thesis deals with thermal qualities of moulding mixtures of foundry mould of various types of sand grains and a computer simulation of the solidification of the cast. The aim of this work is to compare the values of thermal qualities of moulding materials bonded with water glass taken in experimental measurements to the values of thermal qualities of moulding materials connected with organic binding agent contained in simulation software. A sample cast will be moulded in order to evaluate cooling capacities of individual moulding mixtures according the shift of thermal axis. These results will consequently be compared to the results of the simulation.
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Influence of type of base sand on strength of geopolymer sand mixture
Kudr, Martin ; Šupálek, Milan (referee) ; Cupák, Petr (advisor)
The goal of this research is to find out the effect of different types of opening material on bending strength geopolymer’s moulding mixture. Four different silical opening material were used along with two types of binder. To solve the selected problem I have used the test of bending strength. At first I have prepared the moulding mixture and after its induration, I have tested the bending strength. The times were always the same 60, 120 and 1440 minutes. The highest level of bending strength was achieved at opening material SH-34 when using binder Geopol 618. The value of bending strength level was 0,881MPa. The results of this research could help the foundries during implementing technology of geopolymer moulding mixture, which would help particulary when looking for a proper opening material.
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Bigots Curve for the Determination of Plastic Body Properties
Suk, Vojtěch ; Nevřivová, Lenka (referee) ; Sokolář, Radomír (advisor)
This bachelor thesis is focused on the use of the Bigot curve as a tool for assessing the performance of plastic ceramic materials. The theoretical thesis is a form of research of available literature. It elaborates a general view on the Bigot curve and possible application properties which derive from it for some specific soil. In the experimental part were determined properties of plastic ceramic material from location Jirčany from which were formed samples made of plastic dough with different moisture content, with the addition of grog and additives. Properties such as shape of Bigot curve, critical moisture value, size of drying shrinkage and drying sensitivity of the soil were monitored on the samples.
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Thermoproperties of foundry moulds in dependence on different used foundry sands
Šuráň, Jiří ; Rusín, Karel (referee) ; Cupák, Petr (advisor)
The project elaborated in frame of engineering studies is submitting the study of thermal properties of holding mixtures using different types of sand. Were tested a total of 5 sands: zirkon, ŠH22, chromite, olivine and dunite. Molding compounds were tested for thermal capacity, thermal conductivity and heat accumulation. The highest heat capacity was achieved in dunite sand. The largest heat accumulation had mixture with chromite sand and the best thermal conductivity was found in a mixture with olivine sand.
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Brickmaking grogs and their thermo-dilatometric determination
Hladík, Václav ; Skotal, Zbyněk (referee) ; Sokolář, Radomír (advisor)
Main focus of the bachelor´s thesis is use of rock waste fraction as an alternative raw material to traditional quartz sand. Effect of this substitution on ceramic produts properties is outlined. Key properties are water absorption, flexural strength and compressive strength. The practical part traces the potential of alternative grogs. Their behavior is monitored by DKTA analysis, water absorption tests and strength tests. Thesis includes author´s suggestion of an optimal grog based on publications and results of the practical part.
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Comparison of technological, environmental and economical properties of various binder systems of mould sand mixtures
Ambrož, Ondřej ; Rusín, Karel (referee) ; Cupák, Petr (advisor)
This bachelor thesis is focused on a comparison of technological, environmental and economical properties of various binder systems of mould sand mixtures. The thesis comprises basic overview of the systems used in foundry practice and the individual systems are described properties, advantages, disadvantages and applications. There are mentioned harmful substances which are generated during the preparation of the sand mixture and during casting. Requirements for ecological production castings are a prerequisite for the development of new methods which are environmentally friendly and are also characterized by favorable technological and economic characteristics.
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Assessment of resistance castables to chemically aggressive environments.
Mátl, Daniel ; Henek,, Milan (referee) ; Nevřivová, Lenka (advisor)
There are applications of refractory concretes for places where these are exposed to corrosive environments. This bachelor thesis deals with both description the corrosive effects and methodology of their testing. One of the most important properties of materials, affecting the chemical corrosion resistance, is their density. The practical part of the thesis is focused on testing the grogs which are currently used for production of refractory concrete. The aggregates were tested for the resistance to sulfuric acid.
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Recycling of clay bricks dust as granulate
Prokopová, Zdeňka ; Pavelka, Oldřich (referee) ; Sokolář, Radomír (advisor)
The bachelor thesis is focused on recycling of brick sanding dust in the form of granulate produced on a pelletizing plate. The theoretical part describes the grog used in brick technology and possible methods of testing them. There are also examples of published experiments of how to produce or use artificial grog in the brick technology. There are also several examples of artificial grog that is currently available on the market. In the theoretical part, the behavior of the produced granulate from brick sanding dust on a pelletizing plate in a plastic dough was verified in laboratory conditions, then especially its behavior after passing through a laboratory roller mill. The change in granulometry and shape of the grog was evaluated. The distribution, granulometry and shape of the grog and the thermal conductivity of the fired shard were evaluated. For comparison, the standard used grog was used, namely quartz sand and quarry stone. Based on the results, it can be said that brick sanding dust granulate can at least partially replace another type of grog, but more extensive research is needed.
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Recycling of clay bricks dust as granulate
Prokopová, Zdeňka ; Pavelka, Oldřich (referee) ; Sokolář, Radomír (advisor)
The bachelor thesis is focused on recycling of brick sanding dust in the form of granulate produced on a pelletizing plate. The theoretical part describes the grog used in brick technology and possible methods of testing them. There are also examples of published experiments of how to produce or use artificial grog in the brick technology. There are also several examples of artificial grog that is currently available on the market. In the theoretical part, the behavior of the produced granulate from brick sanding dust on a pelletizing plate in a plastic dough was verified in laboratory conditions, then especially its behavior after passing through a laboratory roller mill. The change in granulometry and shape of the grog was evaluated. The distribution, granulometry and shape of the grog and the thermal conductivity of the fired shard were evaluated. For comparison, the standard used grog was used, namely quartz sand and quarry stone. Based on the results, it can be said that brick sanding dust granulate can at least partially replace another type of grog, but more extensive research is needed.
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Brickmaking grogs and their thermo-dilatometric determination
Hladík, Václav ; Skotal, Zbyněk (referee) ; Sokolář, Radomír (advisor)
Main focus of the bachelor´s thesis is use of rock waste fraction as an alternative raw material to traditional quartz sand. Effect of this substitution on ceramic produts properties is outlined. Key properties are water absorption, flexural strength and compressive strength. The practical part traces the potential of alternative grogs. Their behavior is monitored by DKTA analysis, water absorption tests and strength tests. Thesis includes author´s suggestion of an optimal grog based on publications and results of the practical part.
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