Fabrication and Biological Properties of Bionic Structure Porous Alumina Ceramics with Spherical/Lamellar Pores

2015 ◽  
Vol 815 ◽  
pp. 367-372 ◽  
Author(s):  
Yu Fei Tang ◽  
Qian Miao ◽  
Ying Liu ◽  
Zi Xiang Wu ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Porous Alumina ◽  
Porous Ceramic ◽  
Biological Properties ◽  
Alumina Ceramics ◽  
Pore Connectivity ◽  
Bionic Structure ◽  
Pass Through ◽  
Fabrication Parameters ◽  
Highly Porous

In order to solve the problem that low pore connectivity of the spherical porous ceramic, bionic structure porous alumina ceramics with spherical/lamellar pores were fabricated combining the adding pore-forming agent and two step freeze casting. The effects of fabrication parameters of the samples on morphologies, porosity and pore connectivity are investigated. The mechanical and biological properties of bionic structure porous alumina ceramics are also characterized. Results show that porous alumina ceramics with spherical/lamellar pores are obtained, and the lamellar pores pass through the spherical pores, which prove the pore connectivity reach 86.2 %. The mechanical properties are improved by porosity gradient from the inside (highly porous) to the outside (less porous) of porous alumina. Bionic structure porous alumina ceramics with spherical/lamellar pores have better cell growth and absorbance than those with spherical or lamellar pores only since its high pore connectivity.

Preparation and characterization of highly porous ceramic-based nanocomposite scaffolds with improved mechanical properties using the liquid phase-assisted sintering method

2018 ◽  
Vol 233 (9) ◽  
pp. 1854-1865
Author(s):  
Mansure Kazemi ◽  
Bahareh Nazari ◽  
Jafar Ai ◽  
Nasrin Lotfibakhshaiesh ◽  
Ali Samadikuchaksaraei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Culture ◽  
Bioactive Glass ◽  
Tricalcium Phosphate ◽  
Porous Ceramic ◽  
Simulated Body Fluid Solution ◽  
Biological Properties ◽  
Glass Content ◽  
Composite Scaffolds ◽  
Highly Porous

Recent advances in the field of biomaterials have led to the development of ceramic–matrix nanocomposites with enhanced mechanical properties, which is essential for hard tissue scaffolds. In this study, the improvement in mechanical and biological properties of β-tricalcium phosphate reinforced with 45S5 bioactive glass under different sintering conditions was studied. In order to improve the thermal stability and biological responses, β-tricalcium phosphate was doped with 5 mol% strontium ions. Highly porous nanocomposites, with different weight ratios of Sr-tricalcium phosphate/bioactive glass (75/25, 50/50, 25/75), were fabricated through the foam replication method by sintering samples under various thermal conditions (1200–1250 ℃/0–1 h). The effects of bioactive glass content and sintering parameters on microstructure and mechanical behaviors of the nanocomposites were assessed. The obtained results showed that increasing 45S5 bioactive glass content, sintering temperature, and dwelling time gradually improved the mechanical properties of final products which were ascribed to the improved ceramic densification. The composites with the optimal compressive strength were selected to apply in further characterization and cell culture experiments. The selected scaffolds showed excellent bioactivity since a continuous layer of minerals covered the entire surface of composites after immersion in simulated body fluid solution for two weeks. Moreover, the cell culture studies demonstrated that the composite scaffolds could well support the attachment and proliferation of MG-63 osteoblast-like cells. This investigation clearly concluded that the appropriate incorporation of 45S5 bioactive glass into the β-tricalcium phosphate matrix can effectively promote the mechanical behavior, bioactivity, and biocompatibility of the resultant composite scaffolds.

scholarly journals Evaluation of mechanical properties of porous alumina ceramics obtained using rice husk as a porogenic agent

Cerâmica ◽  
2019 ◽  
Vol 65 (suppl 1) ◽  
pp. 70-74 ◽  
Author(s):  
G. C. Ribeiro ◽  
B. A. Fortes ◽  
L. da Silva ◽  
J. A. Castro ◽  
S. Ribeiro
Keyword(s):  
Mechanical Properties ◽  
Rice Husk ◽  
Porous Alumina ◽  
Alumina Ceramics

Mechanical strength and damage tolerance of highly porous alumina ceramics produced from sintered particle stabilized foams

2016 ◽  
Vol 42 (7) ◽  
pp. 8478-8487 ◽  
Author(s):  
Carolina Tallon ◽  
Chayuda Chuanuwatanakul ◽  
David E. Dunstan ◽  
George V. Franks
Keyword(s):  
Mechanical Strength ◽  
Damage Tolerance ◽  
Porous Alumina ◽  
Alumina Ceramics ◽  
Highly Porous

scholarly journals Microstructure and Mechanical Properties of Heterogeneous Ceramic-Polymer Composite Using Interpenetrating Network

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Eun-Hee Kim ◽  
Yeon-Gil Jung ◽  
Chang-Yong Jo
Keyword(s):  
Mechanical Properties ◽  
Fracture Strength ◽  
Porous Alumina ◽  
Porous Ceramic ◽  
Crosslinking Density ◽  
Porous Matrix ◽  
Interpenetrating Network ◽  
Polyurethane Acrylate ◽  
The Matrix ◽  
Distribution Of Stress

Prepolymer, which can be polymerized by a photo, has been infiltrated into a porous ceramic to improve the addition effect of polymer into the ceramic, as a function of the functionality of prepolymer. It induces the increase in the mechanical properties of the ceramic. The porous alumina (Al2O3) and the polyurethane acrylate (PUA) with a network structure by photo-polymerization were used as the matrix and infiltration materials, respectively. The porous Al2O3matrix without the polymer shows lower values in fracture strength than the composites, since the stress is transmitted more quickly via propagation of cracks from intrinsic defects in the porous matrix. However, in the case of composites, the distribution of stress between heterophases results in the improved mechanical properties. In addition, the mechanical properties of composites, such as elastic modulus and fracture strength, are enhanced with increasing the functionality of prepolymer attributed to the crosslinking density of polymer.

Preparation Process and Performance of Porous Alumina Ceramics

2014 ◽  
Vol 926-930 ◽  
pp. 186-189
Author(s):  
Xian Zhong Wang
Keyword(s):  
Process Parameters ◽  
Porous Alumina ◽  
Porous Ceramic ◽  
Strength Properties ◽  
Preparation Process ◽  
Alumina Ceramics ◽  
And Performance

The preparation process of porous alumina ceramics, the effect of process parameters on the performance of porous ceramic, the findings suggest that pore-forming agent sintered alumina ceramics sintered strength properties and have a greater impact; binders for ceramic porous A1203 porosity has a greater impact.

Enhanced mechanical properties and decreased thermal conductivity of porous alumina ceramics by optimizing pore structure

2018 ◽  
Vol 44 (11) ◽  
pp. 13240-13246 ◽  
Author(s):  
Jingjing Liu ◽  
Bo Ren ◽  
Tianbin Zhu ◽  
Shu Yan ◽  
Xiaoyan Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Pore Structure ◽  
Porous Alumina ◽  
Alumina Ceramics
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