Silver catalytic effect on flash sintering of ceramics

Isabela R. Lavagnini; Bola Yoon; Viviana Avila; Sanjit K. Ghose; Rishi Raj; Eliria M.J.A. Pallone; Lílian M. Jesus; João V. Campos

Open Ceramics (Mar 2024)

Silver catalytic effect on flash sintering of ceramics

Isabela R. Lavagnini,
Bola Yoon,
Viviana Avila,
Sanjit K. Ghose,
Rishi Raj,
Eliria M.J.A. Pallone,
Lílian M. Jesus,
João V. Campos

Affiliations

Isabela R. Lavagnini: Departamento de Engenharia de Biossistemas, Universidade de São Paulo, USP AV. Duque de Caxias Norte, 225, Pirassununga, SP, Brazil; Department of Materials Engineering, Federal University of Sao Carlos, 13635-905, Sao Carlos, SP, Brazil; Department of Mechanical Engineering, University of Colorado at Boulder, Colorado, 80309-0427, USA
Bola Yoon: Department of Mechanical Engineering, University of Colorado at Boulder, Colorado, 80309-0427, USA
Viviana Avila: Department of Mechanical Engineering, University of Colorado at Boulder, Colorado, 80309-0427, USA
Sanjit K. Ghose: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA
Rishi Raj: Department of Mechanical Engineering, University of Colorado at Boulder, Colorado, 80309-0427, USA
Eliria M.J.A. Pallone: Departamento de Engenharia de Biossistemas, Universidade de São Paulo, USP AV. Duque de Caxias Norte, 225, Pirassununga, SP, Brazil; Postgraduate Programme in Materials Science and Engineering, University of São Paulo, USP/FZEA, Av. Duque de Caxias Norte, 225, 13635-900 Pirassununga, Brazil
Lílian M. Jesus: Group of Advanced Functional Materials (MAFA), Department of Physics, Universidade Federal de São Carlos (UFSCAR), São Carlos, SP, 13565-905, Brazil
João V. Campos: Department of Materials Engineering, Federal University of Sao Carlos, 13635-905, Sao Carlos, SP, Brazil; Department of Mechanical Engineering, University of Colorado at Boulder, Colorado, 80309-0427, USA; Corresponding author. Department of Materials Engineering, Federal University of Sao Carlos, 13635-905, Sao Carlos, SP, Brazil.

Journal volume & issue: Vol. 17
p. 100565

Abstract

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We investigated the use of metallic silver as a catalyst for flash sintering on hydroxyapatite/zirconia (HZ) composites. Adding 3 wt% of silver to the ceramic powder reduced the flash onset temperature (from 1084 °C to 925 °C) and also the electric field (from 300 V cm−1 to 150 V cm−1) used in the process. We attribute this behaviour to the formation of a silver percolation path that acts as a heat source, accelerating the thermal runaway. As a result, both the flash temperature and the required electric field were reduced. Furthermore, the results suggest that the temperatures along the percolation paths are high enough to reach the boiling point of silver, forming a gaseous phase that leaves the sample.

Published in Open Ceramics

ISSN: 2666-5395 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Chemical technology: Clay industries. Ceramics. Glass
Website: https://www.journals.elsevier.com/open-ceramics

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