Microcracking and mechanical properties of YBa2Cu3Ox ceramics

J.W. Severin; G. With, de

Microcracking and mechanical properties of YBa2Cu3Ox ceramics

Materials and Interface Chemistry

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

Abstract

Elasticity, hardness and fracture data have been measured on superconducting YBa, Cu3 O~ ceramics with a relative density ranging from 87 to 93% and a grain size from about 10 to 2411m. For the 93% dense material a value of 112 GPafor the Young’s modulus and a hardness value of about 4.5 GPa are obtained. The strength andfracture toughness are dependent on cooling rate. A strength of 86 and 117 MPa are obtained for ‘fast’ and ‘slow’ cooling rates respectively. The corresponding fracture toughness measurements yielded 1•2 and 1•4 MPa. m1. The fracture toughness can be sign~cantly lower, as observed on some specimens, probably by reaction with water at the grain boundaries. Extensive microcracking, in agreement with theoretical expectations, was observed by microscopy. Further evidence from mercury intrusion porosimetry and N, adsorption analysis is presented. Possible consequences are discussed.

Original language	English
Title of host publication	Superconducting ceramics
Editors	R. Freer
Place of Publication	Stoke-on-Trent
Publisher	The Institute of Ceramics
Pages	249-256
Publication status	Published - 1988

Publication series

Name	British Ceramic Proceedings
Volume	40
ISSN (Print)	0268-4373

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Cite this

@inproceedings{60dc1f891f034f9c86fe7c864e1e9dfa,

title = "Microcracking and mechanical properties of YBa2Cu3Ox ceramics",

abstract = "Elasticity, hardness and fracture data have been measured on superconducting YBa, Cu3 O~ ceramics with a relative density ranging from 87 to 93% and a grain size from about 10 to 2411m. For the 93% dense material a value of 112 GPafor the Young{\textquoteright}s modulus and a hardness value of about 4.5 GPa are obtained. The strength andfracture toughness are dependent on cooling rate. A strength of 86 and 117 MPa are obtained for {\textquoteleft}fast{\textquoteright} and {\textquoteleft}slow{\textquoteright} cooling rates respectively. The corresponding fracture toughness measurements yielded 1•2 and 1•4 MPa. m1. The fracture toughness can be sign~cantly lower, as observed on some specimens, probably by reaction with water at the grain boundaries. Extensive microcracking, in agreement with theoretical expectations, was observed by microscopy. Further evidence from mercury intrusion porosimetry and N, adsorption analysis is presented. Possible consequences are discussed.",

author = "J.W. Severin and {With, de}, G.",

year = "1988",

language = "English",

series = "British Ceramic Proceedings",

publisher = "The Institute of Ceramics",

pages = "249--256",

editor = "R. Freer",

booktitle = "Superconducting ceramics",

}

TY - GEN

T1 - Microcracking and mechanical properties of YBa2Cu3Ox ceramics

AU - Severin, J.W.

AU - With, de, G.

PY - 1988

Y1 - 1988

N2 - Elasticity, hardness and fracture data have been measured on superconducting YBa, Cu3 O~ ceramics with a relative density ranging from 87 to 93% and a grain size from about 10 to 2411m. For the 93% dense material a value of 112 GPafor the Young’s modulus and a hardness value of about 4.5 GPa are obtained. The strength andfracture toughness are dependent on cooling rate. A strength of 86 and 117 MPa are obtained for ‘fast’ and ‘slow’ cooling rates respectively. The corresponding fracture toughness measurements yielded 1•2 and 1•4 MPa. m1. The fracture toughness can be sign~cantly lower, as observed on some specimens, probably by reaction with water at the grain boundaries. Extensive microcracking, in agreement with theoretical expectations, was observed by microscopy. Further evidence from mercury intrusion porosimetry and N, adsorption analysis is presented. Possible consequences are discussed.

AB - Elasticity, hardness and fracture data have been measured on superconducting YBa, Cu3 O~ ceramics with a relative density ranging from 87 to 93% and a grain size from about 10 to 2411m. For the 93% dense material a value of 112 GPafor the Young’s modulus and a hardness value of about 4.5 GPa are obtained. The strength andfracture toughness are dependent on cooling rate. A strength of 86 and 117 MPa are obtained for ‘fast’ and ‘slow’ cooling rates respectively. The corresponding fracture toughness measurements yielded 1•2 and 1•4 MPa. m1. The fracture toughness can be sign~cantly lower, as observed on some specimens, probably by reaction with water at the grain boundaries. Extensive microcracking, in agreement with theoretical expectations, was observed by microscopy. Further evidence from mercury intrusion porosimetry and N, adsorption analysis is presented. Possible consequences are discussed.

M3 - Conference contribution

T3 - British Ceramic Proceedings

SP - 249

EP - 256

BT - Superconducting ceramics

A2 - Freer, R.

PB - The Institute of Ceramics

CY - Stoke-on-Trent

ER -