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Influence of green part microstructure and sintering atmosphere on the formation of porous silicon nitride ceramics with Yb-silicate matrix

Titelangaben

Knoll, Marco ; Willert-Porada, Monika:
Influence of green part microstructure and sintering atmosphere on the formation of porous silicon nitride ceramics with Yb-silicate matrix.
In: Ohji, Tatsuki ; Wereszczak, Andrew (Hrsg.): Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials II. - Hoboken, NJ, USA : The American Ceramic Society , 2008
ISBN 9780470456224
DOI: https://doi.org/10.1002/9780470456224.ch7

Abstract

This paper summarizes results of a Study on grain boundary phase distribution and surface layer composition in porous silicon nitride ceramics with Yb-silicate utilized as liquid phase forming additive, upon sintering at ambient pressure in a silicon nitride powder bed. The lowest amount of Yb(2)SiO(5)-additive sufficient to achieve complete transformation of alpha-Si(3)N(4) to beta-Si(3)N(4) is 3.2 mol%. corresponding to 10wt%. The pure silicate is superior as additive when compared with oxide-silicate mixtures. The soaking temperature is identified as the major factor influencing the shrinkage and weight loss, while the extension of a compositional gradient of the additive within the sintered part and the composition of the surface near layers is significantly affected by the composition of the sintering atmosphere during heat up. When argon gas is used during heating up and replaced by nitrogen upon soaking the surface of the sintered ceramic is free of Yb(2)SiO(5), whereas in N(2)-atmosphere a silicate-rich coating is found as surface layer of the porous silicon nitride ceramic.

Influence of Green Part Microstructure and Sintering Atmosphere on the Formation of Porous Silicon Nitride Ceramics with YB-Silicate Matrix. Available from: https://www.researchgate.net/publication/278090206_Influence_of_Green_Part_Microstructure_and_Sintering_Atmosphere_on_the_Formation_of_Porous_Silicon_Nitride_Ceramics_with_YB-Silicate_Matrix [accessed Oct 5, 2017].

Weitere Angaben

Publikationsform: Aufsatz in einem Buch
Begutachteter Beitrag: Ja
Keywords: grain boundary phase distribution; silicon nitride ceramics; Sintering; soaking temperature; argon gas
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren > Lehrstuhl Werkstoffverarbeitung - Univ.-Prof. Dr. Monika Willert-Porada
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 09 Okt 2017 12:59
Letzte Änderung: 09 Okt 2017 12:59
URI: https://eref.uni-bayreuth.de/id/eprint/14526