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

Title data

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 (ed.): 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 in another language

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].

Further data

Item Type: Article in a book
Refereed: Yes
Keywords: grain boundary phase distribution; silicon nitride ceramics; Sintering; soaking temperature; argon gas
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Ehemalige Professoren > Chair Materials Processing - Univ.-Prof. Dr. Monika Willert-Porada
Faculties
Faculties > Faculty of Engineering Science > Ehemalige Professoren
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 09 Oct 2017 12:59
Last Modified: 09 Oct 2017 12:59
URI: https://eref.uni-bayreuth.de/id/eprint/14526