Fabrication, Sinterability, and Mechanical Properties of Lead Zirconate Titanate/Silver Composites

High‐toughness and high‐strength lead zirconate titanate (PZT) composites that contain fine silver particles were successfully fabricated at low sintering temperatures. Addition of silver to a PZT matrix did not result in unwanted reaction phases; however, some silver diffused toward the perovskite...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1999-09, Vol.82 (9), p.2417-2422
Main Authors: Hwang, Hae Jin, Yasuoka, Masaki, Sando, Mutsuo, Toriyama, Motohiro, Niihara, Koichi
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Diffusion
Electrotechnical and electronic ceramics
Exact sciences and technology
Lead zirconate titanates
Particulate composites
Residual stress
Shape
Silver
Sinterability
Technical ceramics
Toughening
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Summary:High‐toughness and high‐strength lead zirconate titanate (PZT) composites that contain fine silver particles were successfully fabricated at low sintering temperatures. Addition of silver to a PZT matrix did not result in unwanted reaction phases; however, some silver diffused toward the perovskite crystal structure. A small quantity of silver accelerated the sinterability of the PZT composites. The formation of oxygen vacancies due to the partial substitution of silver appeared to enhance the sinterability of the PZT. Fracture toughness depended on the size and degree of sphericity of the silver particles, and SEM observations on crack propagation suggested that the toughening mechanism in the PZT/Ag composites involves crack bridging resulting from the ductile behavior of silver particles. It is proposed that high fracture strength in PZT/1 to 5 vol% Ag composites results from the relaxation of transformation‐induced internal stress by the silver particles.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1999.tb02099.x