Comparative Study Of Static And Cyclic Fatigue Of Zrb2-Sic Ceramic Composites

Keywords

Bridging; Crack; Cyclic effect; Fatigue; ZrB -SiC ceramic composite 2

Abstract

Room temperature static and cyclic fatigue of ZrB2-32 vol% SiC and ZrB2-45 vol% SiC particulate ceramic composites has been studied. It was established that the presence of grain bridging plays an important role in the lifetime and time dependent mechanical performance of ZrB2-SiC composites. It was also established that the cohesive strength of grain boundaries of the composites was a determining factor if grain bridging would occur during crack growth, as the grain boundaries strength would determine the pathway of the moving crack. Grain bridging was limited in ZrB2-32 vol% SiC leading to the absence of a cyclic fatigue effect, while grain bridging indeed occurred in ZrB2-45 vol%SiC contributing to a cyclic fatigue effect which limits the lifetime of the composite. Such differences were responsible for the occurrence of R-curve behavior in ZrB2-SiC ceramic composites.

Publication Date

4-1-2018

Publication Title

Journal of the European Ceramic Society

Volume

38

Issue

4

Number of Pages

1128-1135

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.jeurceramsoc.2017.12.024

Socpus ID

85039062495 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85039062495

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