0
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

Abstract

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
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In