TECHNICAL PAPERS: Gas Turbines: Ceramics

High-Temperature Properties of SiC-Si3N4 Particle Composites

[+] Author and Article Information
G. Woetting, B. Caspers, E. Gugel

CFI GmbH & Co. KG, Oeslauer Strasse 35, 96472 Roedental, Germany

R. Westerheide

FhG-IWM, 79108 Freiburg, Germany

J. Eng. Gas Turbines Power 122(1), 8-12 (Oct 20, 1999) (5 pages) doi:10.1115/1.483171 History: Received March 25, 1998; Revised October 20, 1999
Copyright © 2000 by ASME
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Microstructure of SlC-SN materials (SEM, etched; Code: see Table 1); (a) 100SC, (b) 75SC, (c) 30SC, (d) 20SC, (e) 5SC and (f ) 100SN.
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TEM investigation of the SiC/Si3N4 composite with 5 percent SiC; 1: Si3N4: 2: SiC intracrystalline; 3: SiC intercrystalline; 4: secondary phase.
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Bending strength at room-temperature and 1400°C in air of hot-pressed SiC-SN-materials
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Fracture toughness and hardness of hot-pressed SiC-SN-materials
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Young’s moduli of the hot-pressed SiC-SN-materials as a function of temperature (a) absolute values and (b) relative changes
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Flexural creep of hot-pressed SiC-SN-materials
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Oxidation of hot-pressed SiC-SN-materials (1400°C, 100 h, air)
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SEM-analysis of materials’ degradation by oxidation at 1400°C; (a) and (b) 100SN with formation of secondary pore zone; (c) 5SC/95SN without this effect (1: oxidized surface; 2: cross section through sample; 3: secondary porosity).



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