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

We introduce the successful fabrication of inorganic polymer derived microchannels with organic solvent resistance and optical transparency, via economic micro-molding process by using two types of source materials: commercial polyvinylsilazane (HTT1800 Kion Corp.), or allylhydropolycarbosilane (SMP-10, Starfire Co.). And we demonstrated the reliable microchemical performance in various organic solvents such as THF, DMF and acetonitrile at elevated temperatures. Knovenagel and Diels-Alder reactions were successfully run by pressured-driven flow in 2 cm and 16 cm long channel, respectively. It is proven that the developed inorganic polymer-based microchannels were obviously performed as a niche material-based microfluidic device between plastic and glass based device. In addition, we present the fabrication and characterization of ceramic microreactors composed of inverted beaded silicon carbide (SiC) monoliths with interconnected pores as catalyst supports, integrated within high-density alumina housings obtained via an optimized gel-casting procedure. These tailored macroporous SiC monoliths deposited Ru as a catalyst was run for the decomposition of ammonia with at temperatures between 450 and 1000 °C, which demonstrated a high temperature fuel cell reformer.

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Fabrication and characterization of Li1+x−yNb1−x−3yTix+4yO3 substrates using aqueous tape casting process

Ceramics International ◽

10.1016/j.ceramint.2007.12.003 ◽

2009 ◽

Vol 35 (1) ◽

pp. 421-426 ◽

Cited By ~ 21

Author(s):

Shaochun Li ◽

Qilong Zhang ◽

Hui Yang ◽

Dong Zou

Keyword(s):

Tape Casting ◽

Casting Process ◽

Fabrication And Characterization

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Mechanical Characterization of Hydroxyapatite-Based, Organic-Inorganic Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.583 ◽

2007 ◽

Vol 539-543 ◽

pp. 583-588 ◽

Cited By ~ 1

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.

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