Fabrication of fully dense zirconia based composites for dental applications
Mariusz Andrzejczuk, Małgorzata Lewandowska, Tomaž Kosmač, Krzysztof J. Kurzydłowski Politechnika Warszawska, Wydział Inżynierii Materiałowej, ul. Wołoska 141, 02-507 Warszawa, Poland
Quarterly No. 4, 2007 pages 165-169
DOI:
keywords: ceramic-polymer composites, Y-TZP, mechanical properties
abstract The aim of this work was to study the influence of polymer infiltration of yttria stabilized ZrO2 on the mechanical pro¬perties and microstructure of the composites. Two grades of powder (TZ-3YSB-E - Coarse and TZ-3YB-E - Fine) with different crystallite size and surface area were used. A series of porous zirconia ceramics with an open porosity around 3537% were produced by biscuit-sintering dry pressed pellets at two different temperatures in an ambient air atmosphere. Thermosetting BisGMA/TEGDMA and polysilazane resins were used during infiltration process. Sample sintered from the fine powder (lower temperature of sintering) reveals fine grained structure with small pores. Ceramic with this type of structure had better mechanical properties. The influence of the polymer infiltration process on the flexural strength and hardness HV10 was determined. It was found that the polymer infiltration leads to an improvement of the mechanical properties of the composites. Flexural strength of composites was 60% higher than that of the porous ceramic. Higher increase in mechanical properties obtained for ceramic infiltrated by BisGMA/TEGDMA resin. The microstructure observation, under high magnification, has shown occurring flaws and inhomogeneities at the interphase boundary. However, they did not influence pro¬perties of composite.