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Uniaxial viscosity of low-temperature cofired ceramic (LTCC) powder compacts determined by loading dilatometry

Xie, Rong-Jun and Zuo, Ruzhong and Aulbach, Emil and Mackens, Uwe and Hirosaki, Naoto and Rödel, Jürgen (2005):
Uniaxial viscosity of low-temperature cofired ceramic (LTCC) powder compacts determined by loading dilatometry.
In: Journal of the European Ceramic Society, pp. 417-424, 25, (4), ISSN 09552219, [Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2004.01.022],
[Article]

Abstract

This paper reports on the experimental determination of the uniaxial viscosity of two commercially available low-temperature cofired ceramic (LTCC) powder compacts, Ceramtape GC (glass-ceramic) and Ferro A6M (glass), by loading dilatometry. Isothermal sintering of cylindrical green compacts was carried out at temperatures ranging from 720 to 840 °C and under varying uniaxial compressive loads of 0–50 N (corresponding to 0–0.5 MPa). Both instantaneous radial and axial strains were measured during sintering. These data were analyzed by using constitutive laws for a porous sintering body and the uniaxial viscosity was calculated as a function of relative density. The activation energy for viscosity was independent of relative density and showed an average value of 668±76 kJ/mol for the Ceramtape material but was not accessible for the Ferro material. The viscosity data were compared with several theoretical models.

Item Type: Article
Erschienen: 2005
Creators: Xie, Rong-Jun and Zuo, Ruzhong and Aulbach, Emil and Mackens, Uwe and Hirosaki, Naoto and Rödel, Jürgen
Title: Uniaxial viscosity of low-temperature cofired ceramic (LTCC) powder compacts determined by loading dilatometry
Language: English
Abstract:

This paper reports on the experimental determination of the uniaxial viscosity of two commercially available low-temperature cofired ceramic (LTCC) powder compacts, Ceramtape GC (glass-ceramic) and Ferro A6M (glass), by loading dilatometry. Isothermal sintering of cylindrical green compacts was carried out at temperatures ranging from 720 to 840 °C and under varying uniaxial compressive loads of 0–50 N (corresponding to 0–0.5 MPa). Both instantaneous radial and axial strains were measured during sintering. These data were analyzed by using constitutive laws for a porous sintering body and the uniaxial viscosity was calculated as a function of relative density. The activation energy for viscosity was independent of relative density and showed an average value of 668±76 kJ/mol for the Ceramtape material but was not accessible for the Ferro material. The viscosity data were compared with several theoretical models.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 25
Number: 4
Uncontrolled Keywords: Dilatometry; Sintering; Porosity; Glass; Glass ceramics; LTCC
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 May 2011 15:19
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2004.01.022
Identification Number: doi:10.1016/j.jeurceramsoc.2004.01.022
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