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Amorphous silicoboron carbonitride ceramic with very high viscosity at temperatures above 1500°C

Riedel, Ralf ; Ruwisch, L. M. ; An, L. ; Raj, R. :
Amorphous silicoboron carbonitride ceramic with very high viscosity at temperatures above 1500°C.
In: Journal of the American Ceramic Society. 81 (1998), S. 3341-3344, 81 (12) pp. 3341-3344.
[Artikel], (1998)

Kurzbeschreibung (Abstract)

Recently, the viscosity of a predominantly amorphous silicon carbonitride (Si1.7C1.0±0.1N1.5) alloy with an apparent glass-transition temperature (Tg) of 1400°–1500°C was studied. In this study, the creep behavior of silicoboron carbonitride (Si2B1.0C3.4N2.3), which seems to have a Tg value of >1700°C, was examined. Both materials exhibited a three-stage creep behavior. In stage I, the creep rate declined, because of densification. In stage II, the strain rate approaches a steady state. In stage III, it resumes a declining strain rate, which ultimately decreased below the measurement limit of the system. At 1550°C in stage II, the viscosity of silicoboron carbonitride was six orders of magnitude higher than that of fused silica. Among the Si-C-N ceramics, only chemical-vapor-deposited and reaction-bonded silicon carbides seem to have greater creep resistance than the silicoboron carbonitrides at temperatures >1550°C.

Typ des Eintrags: Artikel
Erschienen: 1998
Autor(en): Riedel, Ralf ; Ruwisch, L. M. ; An, L. ; Raj, R.
Titel: Amorphous silicoboron carbonitride ceramic with very high viscosity at temperatures above 1500°C
Sprache: Englisch
Kurzbeschreibung (Abstract):

Recently, the viscosity of a predominantly amorphous silicon carbonitride (Si1.7C1.0±0.1N1.5) alloy with an apparent glass-transition temperature (Tg) of 1400°–1500°C was studied. In this study, the creep behavior of silicoboron carbonitride (Si2B1.0C3.4N2.3), which seems to have a Tg value of >1700°C, was examined. Both materials exhibited a three-stage creep behavior. In stage I, the creep rate declined, because of densification. In stage II, the strain rate approaches a steady state. In stage III, it resumes a declining strain rate, which ultimately decreased below the measurement limit of the system. At 1550°C in stage II, the viscosity of silicoboron carbonitride was six orders of magnitude higher than that of fused silica. Among the Si-C-N ceramics, only chemical-vapor-deposited and reaction-bonded silicon carbides seem to have greater creep resistance than the silicoboron carbonitrides at temperatures >1550°C.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of the American Ceramic Society. 81 (1998), S. 3341-3344
Band: 81
(Heft-)Nummer: 12
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Disperse Feststoffe, Dispersive Solids
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 19 Nov 2008 16:04
Sponsoren: Supported by the Deutsche Forschungsgemeinschaft (Bonn, Germany), the Deutsche Akademische Austauschdienst (Bonn, Germany), the Fonds der Chemischen Industrie (Frankfurt, Germany), and Bayer AG (Leverkusen, Germany)., Also supported by a grant from the North American Treaty Organization and a creativity research grant in the general area of high-temperature structural ceramics from U.S. National Science Foundation, Division of Materials Research (Grant No. DMR- 9796100
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