Mechanical Characterization of Hydroxiapatite Micro/Macro-Porous Ceramics Obtained by Means of Innovative Gel-Casting Process

2009 ◽  
Vol 417-418 ◽  
pp. 565-568 ◽  
Author(s):  
Paolo Marcassoli ◽  
Marina Cabrini ◽  
Jacopo Tirillò ◽  
Cecilia Bartuli ◽  
Paola Palmero ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Mechanical Characterization ◽  
Casting Process ◽  
Maximum Size ◽  
Porous Ceramics ◽  
Critical Stress Intensity Factor ◽  
Gel Casting ◽  
Tissue Reconstruction ◽  
Mechanical Investigation

An innovative gel-casting process was developed in order to obtain macro porous ceramics scaffolds of hydroxyapatite to be used in regenerative medicine for bone tissue reconstruction. Mechanical investigation was carried out on different formulations of dense hydroxyapatite samples in order to evaluate the effect of the gel casting process parameters on the density, the elastic modulus, the tensile and the compressive strength. The fracture critical stress intensity factor (KIC) was also evaluated by means of microhardness measurements. The correlations between KIC and tensile and compressive strength were examined taking into account the average and maximum size of porosity. The mechanical properties of macro and micro-porous HA are in agreement with the model of Gibson and Ashby.

Mechanical Characterization of Hydroxyapatite-Based, Organic-Inorganic Composites

2007 ◽  
Vol 539-543 ◽  
pp. 583-588 ◽  
Author(s):  
Eric M. Rivera-Muñoz ◽  
Rodrigo Velázquez-Castillo ◽  
P. Muñoz-Alvarez
Keyword(s):  
Ir Spectroscopy ◽  
Organic Phase ◽  
Mechanical Characterization ◽  
Casting Process ◽  
Gel Casting ◽  
Inorganic Composites ◽  
Before And After ◽  
Day By Day ◽  
Made In

Hydroxyapatite-based materials have been used for dental and biomedical applications. Newly developed synthesis techniques give cause to a broad field in the study of these materials and industry demands products with better properties day by day. The purpose of the present work was to evaluate the mechanical properties of hydroxyapatite-based (HAp-based), organic-inorganic composites. HAp-based, organic-inorganic composites were obtained by modified gel casting process and organic molecules in a gelatin solution. HAp samples of different sizes and shapes were obtained with controlled micro and macro porosity and then were immersed into several gelatin solutions with different concentrations. X-ray powder Diffraction (XRD), Infra Red (IR) Spectroscopy and Scanning Electron Microscopy (SEM) techniques were used to analyze samples before and after gel casting process in order to assure that chemical and physical properties remains the same after this process. IR Spectroscopy and SEM techniques were used to characterize samples after the introduction of organic phase in order to analyze the final morphology of samples. Mechanical characterization was made in compression mode to samples without and with different concentrations of organic phase in order to establish the optimum conditions in which the highest compressive strength and Young’s modulus is reached.

The Mechanical Characterization of Al2O3 Reinforced AL6061 Metal Matrix Composite

2015 ◽  
Vol 766-767 ◽  
pp. 257-262
Author(s):  
P. Mohan ◽  
M. Kathirvel ◽  
N. Azhagesan ◽  
M. Sivapragash
Keyword(s):  
Fracture Toughness ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Material Characterization ◽  
Metal Matrix ◽  
Treatment Process ◽  
Mechanical Characterization ◽  
Casting Process ◽  
Stir Casting

The aluminium based composites are increasingly being used in the transport, aerospace, marine, automobile and mineral processing industries. The widely used reinforcing materials for these composites are silicon carbide, aluminium oxide and graphite in the form of particles or whiskers. In this study Al6061-6 & 4wt% Al2O3 based metal matrix composite were produced by mechanical stir casting process. The obtained cast metal matrix composite is carefully machined to prepare the test specimens for hardness, tensile as well as fracture toughness studies as per ASTM standards. The hardness, tensile strength and fracture toughness properties of Al6061-Al2O3 composites are explored experimentally. Finally compare the material characterization with heat treatment process sample and compare the fracture toughness of sample with mathematical approach, experimental and finite element method.

Preparation, Microstructure and Properties of ZrO2 Gradient Porous Ceramics by Freeze-Casting Process

2015 ◽  
Vol 816 ◽  
pp. 226-230 ◽  
Author(s):  
Tao Tao Ai
Keyword(s):  
Electron Microscopy ◽  
Compressive Strength ◽  
Porous Structure ◽  
Cross Section ◽  
Lamellar Structure ◽  
Sintering Temperature ◽  
Casting Process ◽  
Porous Ceramics ◽  
Freeze Casting ◽  
Scanning Electron

The ZrO2gradient porous ceramics were prepared by a novel freeze-casting process. The porous structure of the ZrO2ceramics was investigated by scanning electron microscopy (SEM). And the porosity and compressive strength were also measured. Experimental results indicated that the porous structure of the specimens was remarkably affected by the sintering temperature. The dendritic pores were obtained after sintered at 1300 °C. The porosity and compressive strength of the specimen were 56.79% and 4.37 MPa, respectively. As the sintering temperature reached to 1500 °C, a lamellar structure was obtained on the cross-section of the specimen. Meanwhile, the porosity decreased to 26.77% and the compressive strength increased to 8.26 MPa. The ceramics can be divided subsequently into three distinctive zones along the solidification direction, i.e. lamellar zone, transition zone and cellular zone.

Fabrication and properties of mullite fiber matrix porous ceramics by a TBA-based gel-casting process

2013 ◽  
Vol 33 (4) ◽  
pp. 717-725 ◽  
Author(s):  
Zhenguang Hou ◽  
Haiyan Du ◽  
Jiachen Liu ◽  
Ruihua Hao ◽  
Xue Dong ◽  
...  
Keyword(s):  
Casting Process ◽  
Porous Ceramics ◽  
Gel Casting ◽  
Mullite Fiber ◽  
Fiber Matrix

scholarly journals Development and mechanical characterization of novel ceramic foams fabricated by gel-casting

2013 ◽  
Vol 33 (9) ◽  
pp. 1567-1576 ◽  
Author(s):  
J.-M. Tulliani ◽  
M. Lombardi ◽  
P. Palmero ◽  
M. Fornabaio ◽  
L.J. Gibson
Keyword(s):  
Mechanical Characterization ◽  
Ceramic Foams ◽  
Gel Casting

scholarly journals Fabrication and Characterization of Porous MgAl2O4 Ceramics via a Novel Aqueous Gel-Casting Process

Materials ◽  
2017 ◽  
Vol 10 (12) ◽  
pp. 1376 ◽  
Author(s):  
Lei Yuan ◽  
Zongquan Liu ◽  
Zhenli Liu ◽  
Xiao He ◽  
Beiyue Ma ◽  
...  
Keyword(s):  
Casting Process ◽  
Gel Casting ◽  
Fabrication And Characterization

scholarly journals Effects of Kaolin Additives in Fly Ash on Sintering and Properties of Mullite Ceramics

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 887
Author(s):  
Marta Valášková ◽  
Veronika Blahůšková ◽  
Jozef Vlček
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Bulk Density ◽  
Porous Ceramics ◽  
Raw Material ◽  
X Ray Diffraction ◽  
Effective Utilization ◽  
Sintering Properties ◽  
Mullite Ceramics

The effective utilization of fly ash (FA) as a raw material for ceramics production is performed on the FA-kaolin mixtures containing kaolins 10% by mass. The mixtures in comparison with FA and three raw kaolins were annealed to mullite ceramics at temperatures of 1000, 1100, 1200 and 1300 °C. The main aims were to contribute to the discussion on the effect of impurity of Na,K-feldspars in kaolins and Fe2O3 in FA on sintering procedure, porous ceramics properties and mullite structural properties. The phases were characterized using X-ray diffraction and thermogravimetry DTA/TGA methods. Mercury intrusion porosimetry was used for characterization of porosity of ceramic samples. Results evidenced the influence of feldspars in kaolins and Fe2O3 in FA on the sintering temperatures and properties of mullite ceramics. The fully FA-based ceramic sintered at 1100 °C exhibited post-sintering properties of bulk density 2.1 g/cm3; compressive strength 77.5 MPa; and porosity, 2% in comparison with the FA/kaolin-based ceramics properties of bulk density 2.2 g/cm3; compressive strength, 60–65 MPa; and porosity from 9.3 to 16.4% influenced by Na,K-feldspars. The best structural and mechanical characteristics were found for the FAK3 sample, supported by the high content of kaolinite and orthoclase in the kaolin K3 additive. The FAK3 annealed at 1100 °C exhibited good compressive strength of 87.6 MPa at a porosity of 10.6% and density of 2.24 g/cm3 and annealed at 1300 °C the compressive strength of 41.3 MPa at a porosity of 19.2% and density of 1.93 g/cm3.

Influence of the Kind and the Shape of Insulating Materials on the Mechanical Properties of the Composites Plaster- Granular Cork and Plaster- Fiber Alpha

2021 ◽  
Vol 886 ◽  
pp. 241-255
Author(s):  
Youssef Maaloufa ◽  
Soumia Mounir ◽  
Khabbazi Abdelhamid ◽  
Khalid El Harrouni
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Thermal Performance ◽  
Mechanical Characterization ◽  
Mechanical Performance ◽  
Building Envelope ◽  
Insulating Materials

The objective of our work is to study the influence of nature and the shape of the insulating materials on the mechanical performance of composites based on plaster. The study aims to increase the thermal performance of the building envelope and the same time maintains sufficient mechanical properties of the composites studied. Plaster was combined with two additives (alpha fiber and granular cork). A physical and mechanical characterization of the composites plaster-fiber alpha and plaster-cork was carried on. Authors obtained an important gain in term of lightness 27 % concerning the composite plaster-fiber alpha, however for the composite plaster-cork, the value is 34 %. Concerning the mechanical properties, authors found a decrease in flexural strength of 60 % for the plaster-cork, and an increase of 33 % for the plaster-alpha fiber. For the compressive strength, a reduce of 87 % for the plaster-alpha fiber and 80% for the plaster-cork was observed. Those finding are justified by the scanning microscopic electron tests which show the distribution of the two insulators and adhesion within the plaster matrix.

Synthesis and characterization of La0.6Sr0.4−xCaxCo0.2Fe0.8O3 materials by the gel-casting process

2012 ◽  
Vol 521 ◽  
pp. 45-49 ◽  
Author(s):  
Jigui Cheng ◽  
Jie Dong ◽  
Qiumei Jiang ◽  
Rui Wang ◽  
Jianfeng Gao
Keyword(s):  
Casting Process ◽  
Synthesis And Characterization ◽  
Gel Casting
Sign in / Sign up

Export Citation Format

Share Document