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Transparent YAG ceramics
Nowak, Ondřej ; Šťastný, Přemysl (referee) ; Trunec, Martin (advisor)
In this bachelor thesis was done basic theoretical analysis of problems regarding transparent ceramics, their preparation and aplications. Transparent YAG ceramics was prepared with 2 methods, cold isostatic pressing (CIP) and gelcasting (GC). Green bodies were prepared with CIP at pressure 700 MPa and 1000 MPa from 2 different slurries with 2 different Al2O3 powders and 1 prepared with gelcasting method. After that green bodies were annealed to remove binderes and vacuum sintered (10-3 Pa). Sintered samples were compared based on optical properties and microstructure. Because of better optical properties, microstructure analysis was done only on sampled pressed to 1000MPa and gelcasted. In both pressed samples high level of porosity was reported, one was almost completely non-transparent, the other was ranslucent. Sample prepared by gelcasting was almost clearly transparent, but due to presence of unreacted phase Y2O3, minor scattering of light passing through the sample was observed.
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Machinable bioceramic foams prepared by gelcasting method
Šťastný, Přemysl ; Částková, Klára (referee) ; Trunec, Martin (advisor)
Diploma thesis is focused on development of method for preparation individualized bioscaffolds prepared by milling of HA foam prepared by gel casting method and consolidated via epoxy curing reaction. Diploma thesis continues in bachelor thesis Modern processing methods of porous bioceramics. Literature search is filled in the newest knowledge from the field of bioactivity enhancement of scaffolds. Experimental part of diploma thesis described development of system for individualized scaffold manufacturing from HA suspension preparation, preparation of ceramic blocks used as material for machining to final blocks machining. Pressure strength of foam were evaluated, too. Chosen samples were coated with calcium polyphosphate coating for biological response enhancement. Coated samples were given for in-vivo test to partner university in Beijing under the terms of project FP7-NMP-2013-EU-China: "Bioscaffolds"
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Machinable bioceramic foams prepared by gelcasting method
Šťastný, Přemysl ; Částková, Klára (referee) ; Trunec, Martin (advisor)
Diploma thesis is focused on development of method for preparation individualized bioscaffolds prepared by milling of HA foam prepared by gel casting method and consolidated via epoxy curing reaction. Diploma thesis continues in bachelor thesis Modern processing methods of porous bioceramics. Literature search is filled in the newest knowledge from the field of bioactivity enhancement of scaffolds. Experimental part of diploma thesis described development of system for individualized scaffold manufacturing from HA suspension preparation, preparation of ceramic blocks used as material for machining to final blocks machining. Pressure strength of foam were evaluated, too. Chosen samples were coated with calcium polyphosphate coating for biological response enhancement. Coated samples were given for in-vivo test to partner university in Beijing under the terms of project FP7-NMP-2013-EU-China: "Bioscaffolds"
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