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[en] Yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) is a popular material for dental restoration because of its outstanding mechanical properties and biocompatibility. Cold isostatic pressing (CIP) and slip casting are among several consolidation methods for Y-TZP. These methods produce Y-TZP with high mechanical properties. This study aims to enhance the mechanical properties of Y-TZP by combining slip casting and CIP. Y-TZP samples were fabricated using CIP, slip casting, and their combination. Subsequently, the green bodies of the samples were sintered at 1600 degree Celcius. Their mechanical properties (density and hardness) were tested and their microstructures were scrutinized under a scanning electron microscope. Compared with the other two methods, the combined method significantly improved the mechanical properties of Y-TZP. In addition, the combined method also produced a compact and homogeneous microstructure. Therefore, the combination of slip casting and CIP is recommended in the production of Y-TZP with high mechanical properties for dental crown applications. (author)
Journal
Malaysian Journal of Analytical Sciences; ISSN 1394-2506; 
; v. 20(3); p. 642-650
; v. 20(3); p. 642-650
[en] The pore generation technology using PAHM (Poly-acrylonitrile Hollow Microsphere) was studied in order to reduce the weights of tableware. In this study, we verify the property of modified slurry and plasticity of green body by adding PAHM. The modified slurry was prepared by adding 25∼55vol% of PAHM to the slurry for whiteware. The viscosity of slurry was controlled to be low value (25∼45vol%). However, the viscosity of modified slurry increased and the plasticity of modified green body decreased inside the 45∼55vol% range. The formed specimen by slip casting was fired at 1225 deg. C, 1240deg. C. As the amount of PAHM content increased, the weight decreased and the addition of 45vol/% of PAHM resulted in a weight drop of 39%. However, when the PAHM content increased, the strength decreases over 50%. This is caused by the presence of a large volume of surface defects (pores) and defects from the agglomeration of PAHM.
Journal
IOP Conference Series. Materials Science and Engineering (Online); ISSN 1757-899X; ; v. 18(22); [4 p.]
; v. 18(22); [4 p.]
[en] The behaviour of titanium-oxide (TiO2) and barium titanate used in slip casting with plaster moulds is studied. Some data in several tests, as well as materials and methods applied are presented. (M.J.C.)
[pt]
Estuda-se o comportamento do oxido de titanio (TiO2) e titanato de bario (BaTiO3) na obtencao de suspensoes (barbotinas) defloculadas para colagem de pecas em molde de gesso. Apresentam-se os valores encontrados nos diversos ensaios efetuados, como tambem os materiais e metodos utilizados. (M.J.C.)Journal
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