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Methodology of Determination of Electroinsulating Properties
Čanigová, Veronika ; Nevřivová, Lenka (referee) ; Sokolář, Radomír (advisor)
The core of this bachelor thesis is porcelain and electrical porcelain property specification accompanied by definition and explanation of electric conductivity. The theoretical section provides insight into electrical porcelain production from initial raw material exploitation to final stages of body baking. The experimental part compiles a number of electrical porcelain test methods based on current European standards and draft test procedures, which are followed in order to specify properties of conventional electrical porcelain as well as emerging anorthite porcelain based on aluminate cement.
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Incombustible ligtweighting agents for brick body
Suk, Vojtěch ; Stančík,, Hynek (referee) ; Sokolář, Radomír (advisor)
This diploma thesis deals with the possibility of reducing the density of the brick body using the chemical additive Vuppor for different types of soil, which are used for the production of thermal insulating products such as type THERM. Describes the availability of suitable additives (starch, carboxymethylcelullose, acrylic dispersion) that are capable of combining with the additive Vuppor to improve the observation properties.
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The effect of fibres addition on the properties of brick body
Novotný, David ; Stančík,, Hynek (referee) ; Sokolář, Radomír (advisor)
This diploma thesis will discuss possibilities of using inorganic fibers to improve the mechanical properties of the resulting physical body bricks. Assessment of the effect of fiber length, fiber thickness is in the order of micrometers. In this work we were used fibers which are commercially produced for the purpose of reinforcement, but also waste fibers, which mainly serves as an insulator.
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Frost resistance of clay roofing tiles - methodology of laboratory testing
Khongová, Ingrid ; Stančík,, Hynek (referee) ; Sokolář, Radomír (advisor)
This bachelor´s work is focusing on a frost resistance of clay roofing tiles. Frost resistance is among the most important parameters, which is derive from its resistance and lifespan. Direct laboratory methods are very time-consuming so there is a great effort to improve indirect methods, which could most likely determine if tested clay roofing tile is frost resistance or not. Main targer of this bachelor´s work is to summary present knowledge about a issue of frost resistance, description of making frost resistance brick body and description of used methods establishing frost resistance. Practical part is focused on a different tests, which give us informations about microstructure and characteristic of a ceramic body.
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The Effect of Nanofibres Dispergation on the Properties of Sintered Ceramic Body
Němec, Tomáš ; Keršner, Štěpán (referee) ; Sokolář, Radomír (advisor)
The main goal of this diploma´s thesis is to review final qualities of traditional porcelain body with using nanofibers. The theoretical part of the thesis summarizes the current knowledge of the research on ceramic composite with using nanofibers. The vast majority of these researches is engaged by reinforcing technical ceramics, on the other hand area of traditional porcelain is still unexplored area. Besides that there are shown technological ways of the production and dispersion of the most important types of nanofibers. In the practical part of this thesis is experimentaly defined the most effecient way of homogenization procedure and the most effecient dose of nanofibers for pure kaolin body. In conclusion are compared the resulting properties of traditional porcelain body with using Al2O3 and SiO2 nanofibers.
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Brick Dust Arising During Grinding of Burnt Brickwork and Possibilities of its Utilization
Kocmánek, Tomáš ; Sokolář, Radomír (referee) ; Nevřivová, Lenka (advisor)
The diploma thesis focuses on the brick dust arising during grinding of burnt brickwork and the possibilities of its utilization. In the theoretical part origin and basic properties of brick dust is described. Some published results of research on the potential utilization of brick dust in various industries are presented here. Also proposal of utilization of brick dust in the ceramic industry is presented. In the practical part two ceramic raw materials and the two brick dust with different granulometry arising during grinding of burnt brickwork (made from these two ceramic raw materials) were selected. The effect of the addition of brick dust to the ceramic raw materials on the physical - mechanical properties of ceramic body after sintering was investigated.
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The effect of reduction core on the water impermeability and frost resistance of brick body
Kučera, Tomáš ; Stančík,, Hynek (referee) ; Sokolář, Radomír (advisor)
The bachelor thesis reviews effect of reduction core on the basic physical and mechanical properties of fired roof tiles. Theoretical part summarizes the knowledge about the reduction cores effect on the properties of the brick body and describes the basic rules for the successful reduction core elimination during firing of the brick body. In the experimental part are mainly compared properties of porosity, bend strength, impermeability and frost resistance of laboratory prepared samples and those are compared based on differently developed reduction core due to different firing.
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The Combustion of Organic Lightweighting Agents in the Chamotte Materials
Smékalová, Veronika ; Keršner, Štěpán (referee) ; Sokolář, Radomír (advisor)
Lightweight chamotte products are popular building material. There are many types of lightweight chamotte on the market, but the most popular lightening options are organic ingredients. This brings some problems to the production of these products. This thesis deals with the burning of various types of lighters from shards of fireclay materials. In the theoretical part are summarized raw materials, which are necessary for production of lightweight chamotte. The results of the published research studies on the topic of lightening of organic lightening products are being described here. The practical part deals with properties of products made of clay or kaolin with the addition of a certain amount of lighter. These added lighters are spruce sawdust, beech sawdust, peat, bran, paper slurry and anthracite. All these lighters are direct. For comparison, the cenospheres, which represent indirect lightweights, were also included in the research. For all specimens, the temperature interval of burnout of specimens, refractoriness, classification temperature, bulk density, thermal conductivity coefficient and other properties were defined.
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Production and Examination of Foam Ceramic Filters
Ondrášek, Jan ; Sokolář, Radomír (referee) ; Nevřivová, Lenka (advisor)
The aim of this thesis is to describe manufacture of the ceramic foam filters and its materials. Thesis includes description of manufacture of ceramic shard, properties of ceramic suspension and testing carried out not only on materials, but also on fired ceramic filter. Furthermore this thesis includes experimental part which includes evaluation of influence of viscosity on final firmness of the filter and its contraction by desiccation and firing.
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