The Effect of Mullite-Forming Additives on the Properties of Porous Alumina Ceramics
2015
Ieva Zaķe-Tiļuga

Defending
02.12.2015. 15:00, Paula Valdena iela 3/7, Rīga, LV-1048, 272. telpa

Supervisor
Ruta Švinka, Visvaldis Švinka

Reviewers
Līga Bērziņa-Cimdiņa, Andris Actiņš, Nahum Travitzky

The doctoral thesis “The effect of mullite-forming additives on the properties of porous alumina ceramics” researches the impact of mullite-forming additives of different chemical compositions and dispersity rates on the ceramic, mechanical, and thermal properties of highly porous (apparent porosity >50%) Al2O3 ceramics. The doctoral thesis consists of an introduction, three main chapters (Literature Review, Materials and Methods, Experimental Results and Discussion), conclusions, a list of sources used, and appendices. The literature review, covering a period from 1924 till 2015, summarises information on the main uses and fabrication methods of porous ceramics, the widely used Al2O3 composite materials, and the possibilities for improvement of the mechanical and thermal properties of Al2O3 ceramics. The second chapter describes the materials and methods used to achieve the aims of the doctoral thesis. The experimental part studies the effect of mullite-forming additives (micro-sized SiO2 and SiC and SiC, Si3N4, Si3N4 Al2O3 Y2O3 nanopowders) on the bulk density, apparent porosity, mechanical strength, thermal shock resistance and thermal conductivity (including its dependence on the temperature) of porous Al2O3 ceramics. The relation between the microstructure of the materials and the properties mentioned above is also explained. The doctoral thesis is written in Latvian and is 149 pages in length. The thesis contains 59 figures, 9 tables, 27 equations, and 5 appendices, and there are 245 sources of reference used.


Keywords
Poraina keramika, alumīnija oksīds, mullīts, mehāniskās īpašības, siltumvadītspēja

Zaķe-Tiļuga, Ieva. The Effect of Mullite-Forming Additives on the Properties of Porous Alumina Ceramics. PhD Thesis. Rīga: [RTU], 2015. 149 p.

Publication language
Latvian (lv)
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