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An overview of method for studying and quantification of wear
Řeháková, Bára ; Urban, Filip (referee) ; Galas, Radovan (advisor)
This bachelor thesis describes ASTM test methods for determination of wear in accordance to their usefulness to ÚK in FSI VUT in Brno. The beginning concerns with types of wear and their mechanisms and with creation of new test methods. The main section deals with each of the test methods normally used by ÚK and their exact procedures. In the last part of this thesis, comparisons of these are made due to their use according to the type of material.
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Synthesis and fabrication of lead-free piezoceramics
Řeháková, Bára ; Pouchlý, Václav (referee) ; Částková, Klára (advisor)
The topic of this thesis is synthesis and preparation of lead-free pizoceramic with perovskite structure, in particular potassium-sodium niobate (KNN). In theoretical part are described possibilities of KNN synthesis and of it’s shaping and sintering. Experimental part deals with three types of synthesis described in the theretical part – solid state reaction, hydrothermal synthesis, sol-gel synthesis, and subconsequentional shaping of prepared powders by uniaxial pressing, cold isostatic pressure method, sintering (classical in oven, in some cases SPS – spark plasma sintering) of such green body and their following properties like relative density, grain size or charge constant. Preparation of KNN powder by each described method took place, followed by shaping and sintering. Best properties were shown by SPS sintered samples, which reached the highest density and lowest grain growth.
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Synthesis and fabrication of lead-free piezoceramics
Řeháková, Bára ; Pouchlý, Václav (referee) ; Částková, Klára (advisor)
The topic of this thesis is synthesis and preparation of lead-free pizoceramic with perovskite structure, in particular potassium-sodium niobate (KNN). In theoretical part are described possibilities of KNN synthesis and of it’s shaping and sintering. Experimental part deals with three types of synthesis described in the theretical part – solid state reaction, hydrothermal synthesis, sol-gel synthesis, and subconsequentional shaping of prepared powders by uniaxial pressing, cold isostatic pressure method, sintering (classical in oven, in some cases SPS – spark plasma sintering) of such green body and their following properties like relative density, grain size or charge constant. Preparation of KNN powder by each described method took place, followed by shaping and sintering. Best properties were shown by SPS sintered samples, which reached the highest density and lowest grain growth.
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An overview of method for studying and quantification of wear
Řeháková, Bára ; Urban, Filip (referee) ; Galas, Radovan (advisor)
This bachelor thesis describes ASTM test methods for determination of wear in accordance to their usefulness to ÚK in FSI VUT in Brno. The beginning concerns with types of wear and their mechanisms and with creation of new test methods. The main section deals with each of the test methods normally used by ÚK and their exact procedures. In the last part of this thesis, comparisons of these are made due to their use according to the type of material.
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