RESEARCH PAPERS: Gas Turbines: Ceramics

Elevated-Temperature “Ultra” Fast Fracture Strength of Advanced Ceramics: An Approach to Elevated-Temperature “Inert” Strength

[+] Author and Article Information
S. R. Choi

Cleveland State University Cleveland, OH 44115 and Senior Resident Research Scientist NASA Lewis Research Center 21000 Brookpart Road, MS 24-1, Cleveland, OH 44135

J. P. Gyekenyesi

NASA Lewis Research Center, 21000 Brookpart Road, MS 24-1, Cleveland, OH 44135

J. Eng. Gas Turbines Power 121(1), 18-24 (Jan 01, 1999) (7 pages) doi:10.1115/1.2816306 History: Received April 01, 1998; Online November 19, 2007


The determination of “ultra” fast fracture strengths of five silicon nitride ceramics at elevated temperatures has been made by using constant stress-rate (“dynamic fatigue”) testing with a series of “ultra” fast test rates. The test materials included four monolithic and one SiC whisker-reinforced composite silicon nitrides. Of the five test materials, four silicon nitrides exhibited the elevated-temperature strengths that approached their respective room-temperature strengths at an “ultra” fast test rate of 3.3 × 104 MPa/s. This implies that slow crack growth responsible for elevated-temperature failure can be eliminated or minimized by using the “ultra” fast test rate. These ongoing experimental results have shed light on laying a theoretical and practical foundation on the concept and definition of elevated-temperature “inert” strength behavior of advanced ceramics.

Copyright © 1999 by The American Society of Mechanical Engineers
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