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Reaction bonding of Mullite (RBM) in Presence of Scandia Sc2O3

Mechnich, Peter and Schneider, Hartmut (2008) Reaction bonding of Mullite (RBM) in Presence of Scandia Sc2O3. Journal of the European Ceramic Society, 28 (2), pp. 473-478. Elsevier. DOI: 10.1016/j.jeurceramsoc.2007.03.010

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Abstract

The presence of 3<sup>rd</sup> group transition metal oxides yttria and lanthana has a strong accelerating influence on the reaction bonding of mullite (RBM) from silicon and alpha-alumina, even at temperatures below 1350°C. This is due to the formation of a low-viscosity transient liquid phases enhancing Si-oxidation, alumina diffusion and mullite nucleation and growth. The presence of the 3<sup>rd</sup> group transition metal oxide scandia (Sc<sub>2</sub>O<sub>3</sub>) does not show a significant influence on the RBM process up to 1350°C. Sc<sub>2</sub>O<sub>3</sub> does not form low viscous Sc-Al-Si-O liquid phases which enhance reactivity. Instead, a direct formation of Sc-disilicate Sc<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> is observed. At temperatures between 1350°C and 1550°C, a slightly enhanced mullite formation due to accelerated solid state diffusion, and the formation of a ternary Sc-rich aluminosilicate is evident.

Item URL in elib:https://elib.dlr.de/51795/
Document Type:Article
Title:Reaction bonding of Mullite (RBM) in Presence of Scandia Sc2O3
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mechnich, PeterUNSPECIFIEDUNSPECIFIED
Schneider, HartmutUNSPECIFIEDUNSPECIFIED
Date:2008
Journal or Publication Title:Journal of the European Ceramic Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:28
DOI :10.1016/j.jeurceramsoc.2007.03.010
Page Range:pp. 473-478
Publisher:Elsevier
Status:Published
Keywords:mullite, reaction-bonding, scandia
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Combustion Chamber Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional Ceramics
Deposited By: Mechnich, Dr.rer.nat. Peter
Deposited On:16 Nov 2007
Last Modified:27 Apr 2009 14:28

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