Papers by Keyword: Slip Casting

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Authors: Yoshio Sakka, Tohru Suzuki
Abstract: The controlled development of texture is one of the ways for effective in improving the physical and mechanical properties. We’ll demonstrate new processing of textured ceramics as an example of alumina by slip casting in a high magnetic field and subsequent heating. Susceptibility of diamagnetic α-alumina is very small, but the orientation energy of alumina particle by a high magnetic field becomes larger than the thermal energy. α-alumina of a rhombohedral structure shows anisotropic susceptibility, but this anisotropy has up to now been more or less ignored due to its very low value. However, in a high magnetic field the energy of crystal anisotropy becomes comparable to or larger than the energy of thermal motion. The degree of orientation depends on processing factors such as heating temperature, particle size, magnetic field and concentration of suspension, etc. This process technique confers several advantages and it is possible for this type of processing to be applied to other non-cubic ceramics, such as TiO2, ZnO, SnO, HAP, AlN, SiC, etc.
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Authors: J.D. Webster, M.E. Westwood, F.H. Hayes, Richard J. Day, Roger Taylor, A. Duran, M. Aparicio, K. Rebstock, W.D. Vogel
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Authors: S. Watanabe, Satoshi Tanaka, Nozomu Uchida, Keizo Uematsu
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Authors: Calambras Pulgarin Heidi, Albano Maria Patricia, Garrido Liliana Beatriz
Abstract: The ability of zirconia ceramics to develop a bioactive surface is of great importance for biomedical applications. For that, it is also required to control phase stability (i.e. to avoid the tetragonal to monoclinic phase transformation) of zirconia surfaces in order to impart a high mechanical resistance. In this work, the phase stability of dense 3 mol% yttria stabilized-zirconia (3Y-TSZ) ceramics after acid and hydrothermal treatments was examined. Ceramic discs were prepared by slip casting from well dispersed 52 vol% suspensions, and subsequently sintered to 1300-1500 °C. The effect of various synthesis parameters and 0.25 wt% alumina doping on the phase transformation after acid and hydrothermal treatments was semi-quantitatively evaluated by XRD. The 3Y-TSZ sintered to 1500°C exhibited higher t→m transformation than samples sintered at lower temperatures. The phase transformation up to10h of hydrothermal treatment occurred by nucleation and growth mechanisms in which the nucleation process predominated. The presence of 0.25 wt% alumina in 3Y-TSZ sintered at 1500°C slightly enhanced the resistance to acid treatment.
330
Authors: Yu Fei Tang, Kang Zhao, Long Hu
Abstract: Pore size gradient hydroxyapatite scaffolds with interconnected pores were fabricated using a novel template with graded polymer beads and slip casting. The microstructure, phase, porosity, and compression strength of the fabricated pore size gradient HA scaffolds were characterized. The scaffolds were also examined for their cell compatibility in vitro using human osteosarcoma (HOS) cells. By using a polymer template with graded sizes, the scaffolds showed gradually increasing pore size of approximately 177-578 μm and interconnection size ranges from 71.5-290.7 μm along the cylindrical axis. The porosity of selected sections of the pore size gradient HA scaffolds ranged from 62.4-71.2%, while the compressive strength decreased from 8.1-3.72 MPa as the pore size and NaCl content increased. HOS cells showed best growth in sections of the scaffold with pore sizes of 480-578 μm.
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Authors: Rodrigo Sampaio Fernandes, Elson de Campos, Jerusa Góes Aragão Santana, Rogério Pinto Mota
Abstract: Slip/starch casting consolidation (SSCC) is a technique for obtaining porous ceramics, which joins the forming process by starch consolidation with the slip casting method. In this work, a slip which contains ceramic powders, starch and dispersant, is poured into a porous mold and is taken to an oven so that the gelling process occurs. After sintering, it is noticed that the ceramics show different characteristics from the ones obtained exclusively by slip casting or by starch consolidation. Alumina ceramics were produced by using the three methods presented in this work. The ceramics were characterized by apparent porosity, mechanical resistance and scanning electron microscopy. The ceramics produced by SSCC presented the highest mechanical resistance value (289 MPa), while the ones produced by starch consolidation and slip casting presented values of 126 MPa and 191 MPa, respectively.
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Authors: Jin Ye Niu, Zhi Wei Chen, Liu Feng, Zheng Min Li, Min Tan
Abstract: Fused silica micro-powders with D50 of 1.8μm were firstly prepared by ball milling. Effects of milling time on particle size distribution and microstructures of the powders were discussed. Then, the green compacts with volume density of 1.86g/cm3 was obtained by slip casting with lactic acid as dispersant. Effects of lactic acid content on apparent viscosity of the slurry, thickness and density of the green compacts were investigated. Finally, fused silica ceramics with thermal expansion coefficient of 0.56∙10-6/°C, bending strength of 64MPa and volume density of 1.94g/cm3 were prepared.
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Authors: Sho Saito, Yoshio Sakka, Tohru Suzuki, Takeshi Nakata
Abstract: We have demonstrated that textured Al2O3-mullite-SiC nanocomposites can be fabricated by slip casting followed by partial oxidation – reaction sintering of mixed suspensions of Al2O3 and SiC powders in a high magnetic field. The sintered density was changed by the degree of oxidation at 1200 and 1300. The degree of orientation of alumina in the nanocomposite was examined on the basis of the X-ray diffraction patterns and scanning electron micrographs. It is confirmed that alumina-oriented nanocomposites were fabricated. The three-point bending strength at room temperature was observed for the nanocomposites.
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