Personality in Science
Nanotechnologies
R&D Projects
News Of Science
Engineering
International Research & Education
Science & Technology Articles
MRC.ORG.UA

MRC ENGINEERING AND MANUFACTURING
ABOUT US PRODUCTS DESIGN PRODUCTION GALLERY VIDEO ARTICLES PARTNERS VACANCIES SITEMAP

Follow us:



MRC SCIENCE AND TECHNOLOGY
R&D PROJECTS PERSONALITY IN SCIENCE International research and education Methods of testing and research Standardization and Certification NANOTECHNOLOGY NEW ENERGY SCIENCE AND TECHNOLOGY ARTICLES


JOURNAL "DOM"
NEWS OF SCIENCE NEWS OF ENGINEERING


LINKS
Materials Research Centre Ltd. DREXEL UNIVERSITY DNI Carbon materials LINKS Yandex Search

Journal of the European Ceramic Society 15 (1995) 271-281
1995 Elsevier Science Limited
Printed in Great Britain. All rights reserved
0955-2219/95/9.50

Deformation and Strength of Engineering Ceramics and Single Crystals
G. A. Gogotsi & I. Yu. Ostrovoy
Institute for Problems of Strength, National Academy of Sciences of Ukraine, 2 Timiryazevskaya str., Kiev 252014, Ukraine

(Received 12 November 1993; revised version received 29 June 1994; accepted 9 August 1994)

Abstract

A comparative investigation has been performed of the laws of deformation and strength of engineering silicon nitride-, alumina-, and zirconia-based ceramics, as well as zirconia crystals. The specimens were tested in four-point bending in air over a temperature range from ambient to 1400C. The materials' mechanical behaviour was analyzed by load versus deflection diagrams (deformation diagrams). It has been found that above the brittle-to-ductile transition temperature, TBD, for the ceramics studied it is possible to choose such combinations of temperature and deformationrate, which would ensure the same path of deformation diagrams, i.e. equivalent injluence of those two parameters on the mechanical behaviour of ceramics is observed. The mechanism of inelastic deformation of the ceramics studied is shown to be associated with the development of two processes: viscous flow of the grain boundary phase and crack propagation to a critical size, with one of them prevailing at dtyerent load levels. In contrast to ceramics, the strength of zirconia crystals remained practically unchanged (partially-stabilized crystals) up to 1400C or even increased (fully-stabilized crystals). For all the crystals, static elasticity moduli were independent of the number of repeated-static loading cycles at high temperatures (their values remained constant), while for ceramics a reduction was observed. Partiallystabilized zirconia crystals, as compared to other investigated materials, exhibited practically no creep up to 1400C at loads close to limiting ones. This allows them to be considered as a promising engineering material for high- temperature application.

pdf pdf      html html

 

MRC ltd. / Kiev MATERIALS RESEARCH CENTRE    
www.dom.ua    

 Contact information
MRC Ltd. Materials research centre
Kiev, Krzhizhanovskogo, 3
Tel.: +38 (044) 233-24-43
Tel.: +38 (044) 237-71-87
Fax: +38 (044) 502-41-49
E-mail:
We work: Mon - Sat 10:00 - 18:00
 Creative Commons

Photos of the projects implemented by MRC TM "", as well as articles and videos are published under the Creative Commons Attribution with preservation of terms
(Attribution-ShareAlike) 3.0 Unported. You can freely copy, distribute, modify the materials with link to the author.

  
name=Contacts face= 0.11