4.7 Article

Use of coffee husk ash for preparation of glass-ceramics as potential sealants for solid oxide cells

Journal

CERAMICS INTERNATIONAL
Volume 48, Issue 16, Pages 23145-23150

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.04.295

Keywords

Coffee husk ash; Glass-ceramics; Sealants; Solid oxide cells

Funding

  1. Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES) [200439/2019-7]
  2. Conselho Nacional de Desenvol-vimento Cientifico e Tecnologico (CNPq/Brazil) [001]

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This study demonstrates the feasibility of obtaining glass-ceramic materials by using coffee husk ash as a source of K2O. The analysis of structural, thermal, and microstructural properties reveals that the final materials consist of diopside and nepheline crystals embedded into a glassy phase. These materials offer unique advantages for solid oxide cells, with similar thermal expansion coefficients and high Vicker's microhardness values.
In this work, glass-ceramic materials are obtained from a precursor glass in which coffee husk ash is used as a K2O source. We demonstrate an analysis based on the structural, thermal and microstructural properties of the constituent materials. The final sintered bodies consist of diopside and nepheline crystals embedded into a glassy phase. These materials offer unique advantages as sealants for solid oxide cells (SOCs), with thermal expansion coefficients similar to those of other SOC components (9-10 x 10-6 degrees C- 1) and Vicker's microhardness values of ~7 GPa. These results indicate the feasibility of obtaining glass-ceramics by an environment friendly route, using coffee husk ash instead of commercial potassium carbonate.

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