Original title: Vysoce porézní keramické materiály připravené metodou Spark Plasma Sintering
Translated title: Highly porous ceramic materials prepared by Spark Plasma Sintering
Authors: Barančíková, Miriama ; Spusta, Tomáš (referee) ; Salamon, David (advisor)
Document type: Master’s theses
Year: 2021
Language: slo
Publisher: Vysoké učení technické v Brně. Fakulta strojního inženýrství
Abstract: [slo] [eng]
Porézna keramika je výnimočná variabilitou fyzikálnych vlastností, nízkou hustotou a priepustnosťou. Častým problémom u nej býva vytvorenie stabilného tvaru pri zachovaní vysokej porozity v kombinácii s veľkým špecifickým merným povrchom. V tejto práci boli testované možnosti zachovania vysokého špecifického merného povrchu poréznych SiO2 nanovlákien čiastočne spekaných metódou Spark Plasma Sintering (SPS). Zároveň bolo cieľom pripraviť mechanicky stabilný monolit. SPS bolo použité na spekanie dvoch foriem poréznych vlákien SiO2: vlákien a mletých vlákien. Testované boli rôzne teploty a časy spekania. Ako najvhodnejšia teplota spekania sa javila 600 °C s časom výdrže 5 minút pri tlaku 3 MPa a rýchlosti ohrevu 144 °C/min. Pre oba materiály bol výsledkom tvarovo stabilný obrábateľný disk so špecifickým merným povrchom do 470 m^2/g a porozitou 72 % u vlákien; a špecifickým merným povrchom do 422 m^2/g a porozitou 69 % u mletých vlákien. Porous ceramic materials are an interesting group of materials due to a wide range of physical properties, low density, and good permeability. Production of a monolith with a shape stability that would also have a high specific surface area and high porosity is a common problem with porous ceramics. The goal of this work was to maintain the high specific surface area and to produce a monolith with a shape stability. Two forms of porous silica nanofibers (as prepared and milled) were used and partially sintered using the Spark Plasma Sintering method (SPS). Different sintering times and temperatures for SPS were tested. The findings revealed that the best SPS conditions were as follows: temperature: 600 °C, sintering time: 5 minutes, pressure: 3 MPa, and the heating rate: 144 °C/min. These sintering conditions resulted in a stable silica based machinable monolith made from fibers or milled fibers. The monoliths have the specific surface area of up to 470 m^2/g and porosity of 72 %, or the specific surface area of up to 422 m^2/g and porosity of 69 % for as prepared fibers and milled fibers, respectively.
Keywords: high specific surface area; porous ceramics; porous fibers; silica; Spark Plasma Sintering

Institution: Brno University of Technology (web)
Document availability information: Fulltext is available in the Brno University of Technology Digital Library.
Original record: http://hdl.handle.net/11012/197134

Permalink: http://www.nusl.cz/ntk/nusl-442603


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Universities and colleges > Public universities > Brno University of Technology
Academic theses (ETDs) > Master’s theses