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The preparation and characterization of porous alumina ceramics using an eco‐friendly pore‐forming agent
Author(s) -
Alzukaimi Julian,
Jabrah Rafi
Publication year - 2018
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13126
Subject(s) - materials science , porosity , microstructure , ceramic , ultimate tensile strength , composite material , scanning electron microscope , compressive strength , environmentally friendly , shrinkage , alumina ceramic , green body , ecology , biology
This work presents the preparation of porous alumina ceramics through the sacrificial phase method, using an eco‐friendly material, namely waste coffee grounds, as a pore‐forming agent. The effects of coffee grounds content in the green ceramic bodies on the linear and volumetric shrinkage, as well as the total and open porosity of the sintered product, were evaluated. The influence of the resulting porosity on mechanical properties of the prepared porous alumina was determined using Brazilian disk compression test for the determination of the indirect tensile strength of the prepared samples. Microstructure and pores morphology were characterized by scanning electron microscopy. Porosities in the range 35‐54 vol% were achieved, by varying the coffee grounds content from 0 to 50 wt% in the green bodies. The indirect tensile strength of the final obtained porous alumina ceramic decreased accordingly from 57.4 MPa to 17.7 MPa.