Optimized processing of defect-free porous alumina by gel casting process

2018 ◽  
Vol 26 (3) ◽  
pp. 619-630 ◽  
Author(s):  
Devavarapu Soumya ◽  
Santanu Bhattacharyya
Keyword(s):  
Porous Alumina ◽  
Casting Process ◽  
Gel Casting

Evaluation and Control of Crack Propagation in Dense Porcelain/ Porous Alumina Layered Structures for Dental Material Applications

2006 ◽  
Vol 317-318 ◽  
pp. 457-460 ◽  
Author(s):  
Jae Won Kim ◽  
Seong Hwan Park ◽  
Yeon Gil Jung ◽  
Hee Soo Lee
Keyword(s):  
Crack Propagation ◽  
Buffer Layer ◽  
Porous Alumina ◽  
Casting Process ◽  
Layered Structures ◽  
Alumina Powder ◽  
High Porosity ◽  
Gel Casting ◽  
And Control ◽  
Layered Samples

Layered structures of dense porcelain/porous alumina and dense porcelain/porcelainalumina/ porous alumina are designed and their crack propagation behaviors are investigated. As a substrate, the porous alumina, which is prepared by a gel-casting process using the binary slip of alumina powder and PMMA spherical micro-bead, is dried at room temperature for 24 h and then sintered at 1600 for 2 h. Porcelain is coated on the porous alumina substrate and then re-sintered at 987. Bi- and tri-layered structures are produced by the different dwell times (2 min, 10 min) at re-sintering temperature. There is no delaminating or cracks observed after re-sintering the layered samples. The crack propagation behaviors in the bi- and tri-layered structures are evaluated by micro-indentation. The indentation cracks do not propagate into the porous alumina through interface (porosity; 36~62%) except for another one (porosity; 70%) in the bi-layered samples. In the case of the high porosity bi-layered sample (porosity; 70%), cracks are scattered along the 3-D open-pore channels. However, cracks do not propagate through the interface in the tri-layered samples with a porcelain-alumina buffer layer, because the porcelain-alumina buffer layer plays an important part such as a barrier layer in crack propagation.

Porous Alumina and Zirconia Bodies Obtained by a Novel Gel Casting Process

2009 ◽  
pp. 327-338
Author(s):  
Jean-Marc Tulliani ◽  
Valentina Naglieri ◽  
Mariangela Lombardi ◽  
Laura Montanaro
Keyword(s):  
Porous Alumina ◽  
Casting Process ◽  
Gel Casting

Fabrication of porous alumina–zirconia ceramics by gel-casting and infiltration methods

2014 ◽  
Vol 63 ◽  
pp. 1-5 ◽  
Author(s):  
Ruiping Liu ◽  
Yutao Li ◽  
Chang-An Wang ◽  
Shengnian Tie
Keyword(s):  
Porous Alumina ◽  
Zirconia Ceramics ◽  
Gel Casting

Simultaneous enhancement of elasticity and strength of Al2O3-based ceramics body from cellulose nanocrystals via gel-casting process

2018 ◽  
Vol 181 ◽  
pp. 111-118 ◽  
Author(s):  
Tengfei Deng ◽  
Yanjuan Wang ◽  
Alain Dufresne ◽  
Ning Lin
Keyword(s):  
Cellulose Nanocrystals ◽  
Casting Process ◽  
Gel Casting

Preparation of MgO–Y2O3 Composite Ceramic by Aqueous Gel Casting

2021 ◽  
Vol 16 (3) ◽  
pp. 444-451
Author(s):  
Liangwen Liu ◽  
Mu Zhang ◽  
Xing’an Wang ◽  
Xudong Sun
Keyword(s):  
Casting Process ◽  
Composite Ceramic ◽  
Ethanol Solution ◽  
Zeta Potentials ◽  
Gel Casting ◽  
Modification Process ◽  
Die Pressing ◽  
Ft Ir ◽  
Temperature And Pressure ◽  
Better Than

MgO–Y2O3 composite ceramics were prepared by gel-casting technology. The surface of MgO powder is passivated with H3PO4 ethanol solution. The treated powder can be dispersed in water with a dispersant. The powder surface modification process was verified by pH, Zeta potentials, Fourier transmission infrared absorption spectroscopy (FT-IR), the absorbance of suspension and rheological properties. The obtained stable suspensions were gel cast, dried, and sintered at 1400 °C for 30 min under 35 MPa. As a comparison, the powder was compressed by die pressing and sintered at the same temperature and pressure. After sintering, the MgO–Y2O3 composite ceramic with a theoretical density of 97.29% can be prepared by aqueous gel casting process. The properties of MgO–Y2O3 composite ceramic fabricated by gel casting are better than die pressing.

Sintering behavior and electrical conductivity of Ce0.9Gd0.1O1.95 powder prepared by the gel-casting process

2003 ◽  
Vol 78 (3) ◽  
pp. 791-795 ◽  
Author(s):  
Ji-Gui Cheng ◽  
Shao-Wu Zha ◽  
Jia Huang ◽  
Xing-Qin Liu ◽  
Guang-Yao Meng
Keyword(s):  
Electrical Conductivity ◽  
Casting Process ◽  
Sintering Behavior ◽  
Gel Casting

Microstructure and mechanical properties of hydroxyapatite obtained by gel-casting process

2008 ◽  
Vol 34 (2) ◽  
pp. 359-364 ◽  
Author(s):  
Biqin Chen ◽  
Tao Zhang ◽  
Jingxian Zhang ◽  
Qingling Lin ◽  
Dongliang Jiang
Keyword(s):  
Mechanical Properties ◽  
Casting Process ◽  
Gel Casting ◽  
Microstructure And Mechanical Properties
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