Preparation and Characterization of Ferrite Supported on Porous Ceramic Fiber Composites for Co2Decomposition

2002 ◽  
Vol 39 (8) ◽  
pp. 801-806 ◽  
Keyword(s):  
Porous Ceramic ◽  
Fiber Composites ◽  
Ceramic Fiber

Characterization of ceramic fibers in the SEM and TEM

1986 ◽  
Vol 44 ◽  
pp. 670-673
Author(s):  
L.C. Sawyer ◽  
R.T. Chen
Keyword(s):  
Surface Defects ◽  
Fiber Composites ◽  
Ceramic Fiber ◽  
Ceramic Fibers ◽  
Amorphous Phases ◽  
Polymer Precursors ◽  
Structural Applications ◽  
Crystallite Sizes ◽  
As Stress

Ceramic fiber composites are currently being developed for potential high temperature structural applications. Fibers for these applications are being produced from polymer precursors, such as Nicalon™ silicon carbide (SiC) fibers, commercially produced from polycarbosilane (Nippon Carbon Co.). Experimental ceramic fibers are also being produced as part of a DARPA funded government program by Dow Corning and Celanese. The physical properties of glass and ceramic fibers are well known to be controlled by microstructural features such as crystallinity and crystallite sizes, the nature of amorphous phases, porosity and internal and surface defects or flaws. Defects are known to act as stress concentrators, and the well known Griffith criteria relates their sizes to the tensile stress.

Thermal and Electrical Conductivities of Porous Carbon-Coated Ceramic Fiber Composites

2006 ◽  
Vol 317-318 ◽  
pp. 491-494 ◽  
Author(s):  
Jae Chun Lee ◽  
Jun Suh Yu ◽  
Jae Hoon Sung ◽  
Sung Park ◽  
Sung Chul Choi
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Effective Conductivity ◽  
Porous Ceramic ◽  
Pyrolytic Carbon ◽  
Fiber Composites ◽  
Nitrogen Atmosphere ◽  
Ceramic Fiber ◽  
Electrical Conductivities ◽  
Carbon Coated

Porous ceramic fiber composites were coated with pyrolytic carbon by the decomposition of infiltrated phenolic resin in a nitrogen atmosphere at 800. The amount of carbon coating was varied to tailor the electrical conductivity of the carbon-coated composites. The electrical and thermal conductivity of the composites were measured at room temperature using a two-point method and a hot-wire one, respectively. Up to 30 wt% pyrolytic carbon, the electrical conductivity σ shows linearly increasing tendency and is fitted by the effective conductivity according to the parallel rule of a mixture σeff = ΣΧi ·σi with an effective conductivity of pyrolytic carbon σc= 0.42 S/cm. The thermal conductivity of the coated composites is in the range 0.05-0.08 W/mK and increases with carbon content.

Electrical and Thermal Properties of Carbon-Coated Porous Ceramic Fiber Composites

2005 ◽  
Vol 486-487 ◽  
pp. 370-373
Author(s):  
Jun Suh Yu ◽  
Sung Park ◽  
Jae Chun Lee ◽  
In Sup Hahn ◽  
Sang Kuk Woo
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Carbon Coating ◽  
Effective Conductivity ◽  
Porous Ceramic ◽  
Pyrolytic Carbon ◽  
Fiber Composites ◽  
Nitrogen Atmosphere ◽  
Ceramic Fiber ◽  
Carbon Coated

Porous ceramic fiber composites were coated with pyrolytic carbon by the decomposition of propane in a nitrogen atmosphere at 900°C. The amount of carbon coating was varied through adjusting deposition time to tailor the electrical conductivity of the carbon-coated composites. The electrical and thermal conductivity of the composites were measured at room temperature using a two-point method and a hot-wire method, respectively. Up to 7 wt% pyrolytic carbon, the electrical conductivity σ is linearly increased to 0.02 S/cm and well fitted by the effective conductivity according to the parallel rule of a mixture σ eff = Σ Χ i ·σ i with a conductivity of pyrolytic carbon σ c= 20 S/cm .The thermal conductivity of the uncoated and coated composites is in the range 0.065-0.075 W/mK and little affected by carbon coating presumably owing to the small amount of coated carbon in this work.

Characterization of Nigerian Clay as Porous Ceramic Material

2013 ◽  
Vol 845 ◽  
pp. 256-260 ◽  
Author(s):  
M. Abubakar ◽  
A.B. Aliyu ◽  
Norhayati Ahmad
Keyword(s):  
Thermal Properties ◽  
Bulk Density ◽  
Sintering Temperature ◽  
Starch Content ◽  
Porous Ceramic ◽  
Porous Ceramics ◽  
Cassava Starch ◽  
Compaction Method ◽  
Percentage Porosity

Porous ceramics were produced by compaction method of Nigerian clay and cassava starch. The samples were prepared by adding an amount from 5 to 30%wt of cassava starch into the clay and sintered at temperature of 900-1300°C. The influence of cassava starch content on the bulk density and apparent porosity was studied. The result of XRD and DTA/TGA shows that the optimum sintering temperature was found to be 1300°C. The percentage porosity increased from 12.87 to 43.95% while bulk density decreased from 2.16 to 1.46g/cm3 with the increase of cassava starch from 5 to 30%wt. The effect of sintering temperature and cassava starch content improved the microstructure in terms of porosity and the thermal properties of porous clay for various applications which requires a specific porosity.

Characterization of orientation clustering in short-fiber composites

1990 ◽  
Vol 28 (13) ◽  
pp. 2651-2672 ◽  
Author(s):  
Sridhar Ranganathan ◽  
Suresh G. Advani
Keyword(s):  
Fiber Composites ◽  
Short Fiber

Reliability in the characterization of fiber length distributions of injection molded long carbon fiber composites

2017 ◽  
Vol 39 (12) ◽  
pp. 4594-4604 ◽  
Author(s):  
Bhisham N. Sharma ◽  
Seth A. Kijewski ◽  
Leonard S. Fifield ◽  
Yongsoon Shin ◽  
Charles L. Tucker ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Fiber Length ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Injection Molded ◽  
Long Carbon Fiber

scholarly journals Preparation and Characterization of Porous Ceramic Membranes for Micro-Filtration from Clay/CuZn Using Extrusion Methods

2018 ◽  
Vol 156 ◽  
pp. 08015 ◽  
Author(s):  
Muh Amin ◽  
Muhammad Subri
Keyword(s):  
Porous Ceramic ◽  
Ceramic Materials ◽  
Ceramic Membranes ◽  
Extrusion Process ◽  
X Ray Diffraction ◽  
Percentage Composition ◽  
X Ray ◽  
Ceramic Support ◽  
Fabrication And Characterization

In this study, fabrication and characterization of ceramic membranes preparation was carried out. Porous ceramic membranes were fabricated by extrusion process from different percentage composition of CuZn on (80 wt% Clay, 10 wt% TiO2, 5 wt% Carbon and 5 wt% PVA). The fabricated membranes were sintered at 900°C for 1 hour in an electrical box furnace with heating rate 1oC/min and holding time for 1 hour. Apparent density and porosity were determined by standar methods for ceramic materials. Phase composition of the ceramic support was established by X-Ray Diffraction analysis. SEM studies of the membranes added at different CuZn were carried out.

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