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TECHNICAL PAPERS: Gas Turbines: Ceramics

High Temperature Oxidation and Corrosion of Silicon-Based Non-Oxide Ceramics

[+] Author and Article Information
H. Klemm, M. Herrmann, C. Schubert

Fraunhofer IKTS Dresden, Winterbergstrasse 28, Dresden, FRG D-01277

J. Eng. Gas Turbines Power 122(1), 13-18 (Oct 20, 1999) (6 pages) doi:10.1115/1.483189 History: Received March 25, 1998; Revised October 20, 1999
Copyright © 2000 by ASME
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References

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Figures

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Failure mechanisms of Si3N4 materials during long term mechanical testing of elevated temperatures in air (SCG: slow crack growth)
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Oxidation behavior of the SSiC and the Si3N4 materials without additives at 1500°C, illustrated as the weight gain as a function of the square root of time (□ HIPSN, ▵ SSiC, 2500 h)
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SEM images of polished cross sections of the Si3N4 material (A) after 2500 h, and the SSiC material (B) after 1000 h of oxidation treatment at 1500°C
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Oxidation behavior of the Si3N4 materials with Y2O3 and Y2O3/Al2O3 as sintering additives at 1500°C, illustrated as the weight gain as a function of the square root of time (□ SNY/Al 1000 h, ▵ SNY 2500 h)
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Microstructural damage in the surface region of the Si3N4 materials with Y2O3/Al2O3, 1000 h (a) and Y2O3, 2500 h (b) as sintering additives after oxidation at 1500°C
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Oxidation behavior of the Si3N4 composites at 1500°C (□ Si3N4/SiC, ▵ Si3N4/MoSi2, 5000 h)
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Comparison of the bending strength of the Si3N4 materials as hot pressed and after 1000 h oxidation treatment at 1400, 1450, and 1500°C
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(a) Surface region of a polished and etched cross section and (b) Si2ON2 interlayer in the bulk of the SNC material after 2500 h of oxidation at 1500°C
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(a) Surface region of a polished and etched cross section and (b) Si2ON2 interlayer in the bulk of the Si3N4-MoSi2 composite material after 2500 h of oxidation at 1500°C in air
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Comparison of time-to-failure behavior of silicon-based nonoxide materials at 1400°C in bending; 1 SNMo, 2 SNC, 3 SNY, 4 SSiC

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