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X-ray Computed Tomography and Mercury Porosimetry for Evaluation of Density Evolution and Porosity Distribution (2000)

Lu, Peizhen ; Lannutti, John J. ; Klobes, Peter ; [et al.]

Westerville, Ohio : American Ceramics Society

Journal of the American Ceramic Society 83 (2000), S. 0

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ISSN: 1551-2916

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: X-ray computed tomography (CT) and mercury porosimetry were combined to connect density gradients and the distribution of open porosity in a sintered compact. CT clearly showed that open porosity follows the initial distribution of low-density zones. Mercury porosimetry detected three distinct levels of porosity. Microstructural examination correlated the porosity level with the coordination of (i) two to three or (ii) multiple grains around pores. This combination of techniques provides a novel tool for the study of pore and density-gradient evolution during sintering.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01227.x

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Pore formation during the pyrolysis of C-Nb2O5 and C-Ta2O5 xerogels (1997)

Klobes, Peter ; Preiss, Henry ; Meyer, Klaus ; [et al.]

Springer

Microchimica acta 125 (1997), S. 343-347

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ISSN: 1436-5073

Keywords: niobium and tantalum carbides ; gel ; adsorption isotherm ; pore size distribution ; thermal analysis

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Binary organic-inorganic gels have been prepared by mixing a carbonaceous hydrosol and a Nb2O5 or Ta2O5 sol derived by hydrolysis of the alkoxides. The gels are pyrolyzed under an inert atmosphere into precursors in which carbon and the metal oxides are mixed very intimately. High temperature treatment converts the precursors into the cubic face centered carbides. The precursors as well as the carbides have been shown to be micro- and mesoporous materials. Measurements of nitrogen adsorption reveal a characteristic change of the shapes of the isotherms (Type I → Type IV) and of the hysteresis loops (H4→H2→H1) during the thermal processes. Pore widening has been observed with rising temperature. The phenomena of crystallization, carbothermal reduction and sintering were found to control the pore shape and size. The results of the adsorption measurement correlate well with those of the thermoanalytical and X-ray diffraction studies.