Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 22, Issue 13, Pages 2165-2171Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0955-2219(02)00031-6
Keywords
Ag; Al2O3-ZrO2-Ag; composites; mechanical properties; toughness
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Al2O3/ZrO2/Ag composites were obtained by intense attrition milling of silver and alumina powders with TZP balls. The characteristics of mixtures and the mechanical properties of sintered samples were investigated. Milling in acetone for 7 h results in a homogeneous submicron mixture, Ag composites (10 vol.%) CIPed at 300 MPa contain 8.1 vol.% tetragonal zirconia and 8.0 vol.% silver after sintering in air for 2 h at 1550 degreesC. Fracture toughness and bending strength as high as 5.44 MPa m and 586 MPa were obtained (645 MPa by post-HIPing). The incorporation of more silver (20 vol.%) is detrimental to microstructure quality and strength, but fracture toughness remains high thanks to crack bridging effects developed by ductile metallic inclusions. (C) 2002 Elsevier Science Ltd. All rights reserved.
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