Catalytic Atom Recombination on ZrB2/SiC and HfB2/SiC Ultrahigh-Temperature Ceramic Composites

2004 ◽  
Vol 41 (4) ◽  
pp. 576-581 ◽  
Author(s):  
Jochen Marschall ◽  
Adam Chamberlain ◽  
Daniel Crunkleton ◽  
Bridget Rogers
Keyword(s):  
Ceramic Composites ◽  
Ultrahigh Temperature

A Perspective on Modeling Materials in Extreme Environments: Oxidation of Ultrahigh-Temperature Ceramics

MRS Bulletin ◽  
2006 ◽  
Vol 31 (5) ◽  
pp. 410-418 ◽  
Author(s):  
Angelo Bongiorno ◽  
Clemens J. Först ◽  
Rajiv K. Kalia ◽  
Ju Li ◽  
Jochen Marschall ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
Atomistic Simulation ◽  
Extreme Environments ◽  
Protective Layer ◽  
Ceramic Composites ◽  
Atomistic Modeling ◽  
Temperature Oxidation ◽  
Simulation Techniques ◽  
Oxidation Resistant ◽  
Ultrahigh Temperature

AbstractThe broader context of this discussion, based on a workshop where materials technologists and computational scientists engaged in a dialogue, is an awareness that modeling and simulation techniques and computational capabilities may have matured sufficiently to provide heretofore unavailable insights into the complex microstructural evolution of materials in extreme environments.As an example, this article examines the study of ultrahigh-temperature oxidation-resistant ceramics, through the combination of atomistic simulation and selected experiments.We describe a strategy to investigate oxygen transport through a multi-oxide scale—the protective layer of ultrahigh-temperature ceramic composites ZrB2-SiC and HfB2-SiC—by combining first-principles and atomistic modeling and simulation with selected experiments.

Oxidation of ZrB2-SiC Ultrahigh-Temperature Ceramic Composites in Dissociated Air

2009 ◽  
Vol 23 (2) ◽  
pp. 267-278 ◽  
Author(s):  
Jochen Marschall ◽  
Dusan A. Pejakovic ◽  
William G. Fahrenholtz ◽  
Greg E. Hilmas ◽  
Sumin Zhu ◽  
...  
Keyword(s):  
Ceramic Composites ◽  
Ultrahigh Temperature ◽  
Dissociated Air

Catalytic and Radiative Behaviors of ZrB2-SiC Ultrahigh Temperature Ceramic Composites

2006 ◽  
Vol 43 (5) ◽  
pp. 1004-1012 ◽  
Author(s):  
Luigi Scatteia ◽  
Raffaele Borrelli ◽  
Giovanni Cosentino ◽  
Eric Beche ◽  
Jean-Louis Sans ◽  
...  
Keyword(s):  
Ceramic Composites ◽  
Ultrahigh Temperature

Thermo-mechanical simulation of ultrahigh temperature ceramic composites as alternative materials for gas turbine stator blades

2021 ◽  
Vol 47 (1) ◽  
pp. 567-580 ◽  
Author(s):  
Kourosh Vaferi ◽  
Mohammad Vajdi ◽  
Sanam Nekahi ◽  
Sahar Nekahi ◽  
Farhad Sadegh Moghanlou ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Ceramic Composites ◽  
Mechanical Simulation ◽  
Turbine Stator ◽  
Alternative Materials ◽  
Ultrahigh Temperature

Hypersonic Plasma Setup for Oxidation Testing of Ultrahigh Temperature Ceramic Composites

2020 ◽  
Vol 142 (8) ◽  
Author(s):  
Cristian Cley Paterniani Rita ◽  
Felipe de Souza Miranda ◽  
Felipe Rocha Caliari ◽  
Rosa Rocha ◽  
Alexei Essiptchouk ◽  
...  
Keyword(s):  
Thermal Flux ◽  
Protective Layer ◽  
Ceramic Composites ◽  
Vacuum System ◽  
Mechanical Resistance ◽  
Thermal Flow ◽  
Ultrahigh Temperature ◽  
Loss Of Mass ◽  
Oxidation Testing ◽  
Oxidation Mechanisms

Abstract In this study, a hypersonic plasma setup was constructed based on a vortex plasma heater with prenozzle gas-dynamic insertion. The prenozzle allows the improvement of the characteristics of the vacuum system according to the necessities of the experiments. The plasma setup produces a hypersonic thermal flow, which is capable to test the thermal oxidation of ultrahigh temperature ceramics (UHTC) composites, such as zirconium diboride (ZrB2). Thereby, ZrB2 samples were prepared with a variation of 10, 20, and 30% of silicon carbide (SiC) in volume, in order to investigate the oxidation mechanisms and microstructural properties of the samples tested under hypersonic thermal flow. The results of the oxidation tests showed that the samples with 10 and 30% of SiC undergo to the active oxidation and forms an unstable and fragile ZrO2 oxide. The formed ZrO2 does not withstand the drag force and the thermal flux of the hypersonic plasma jet, partially volatilizing the oxide layer, causing an accentuated loss of mass. For the oxidation tests of the sample with 20% of SiC, the gain of mass was observed due to the formation of ZrSiO4 passivation layer, which is a stable oxide and promotes mechanical resistance, and low degradation rate. These results can be associated with the variation of SiC, which demonstrates an ideal proportion of 20% of SiC in ZrB2, which influences the oxidation mechanisms and produce a protective layer.

Optical Emission Spectroscopy During Plasmatron Testing of ZrB2-SiC Ultrahigh-Temperature Ceramic Composites

2009 ◽  
Vol 23 (2) ◽  
pp. 279-285 ◽  
Author(s):  
Mickaël Playez ◽  
Douglas G. Fletcher ◽  
Jochen Marschall ◽  
William G. Fahrenholtz ◽  
Greg E. Hilmas ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Optical Emission ◽  
Ceramic Composites ◽  
Ultrahigh Temperature
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