Thesis Open Access

Characterization of densification and mechanical properties of ceramic tile produced with partial replacement of coffee husk ash

Fekadu Sori Geleta

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  <identifier identifierType="DOI">10.20372/nadre/21070</identifier>
      <creatorName>Fekadu Sori Geleta</creatorName>
      <affiliation>Addis Ababa Science &amp; Technology University</affiliation>
    <title>Characterization of densification and mechanical properties of ceramic tile produced with partial replacement of coffee husk ash</title>
  <publisher>National Academic Digital Repository of Ethiopia</publisher>
    <subject>Coffee husk ash, Sintering temperature, Glassy phase, Liquid sintering</subject>
    <contributor contributorType="Supervisor">
      <contributorName>Professor Chung Tae Kim</contributorName>
      <affiliation>Addis Ababa Science &amp; Technology University</affiliation>
    <date dateType="Issued">2022-03-03</date>
  <resourceType resourceTypeGeneral="Text">Thesis</resourceType>
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    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.20372/nadre/21069</relatedIdentifier>
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    <rights rightsURI="">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
    <description descriptionType="Abstract">&lt;p&gt;Nowadays, Ethiopia has been undertaking efforts to change natural assets into economic&lt;br&gt;
benefit. As literatures revealed, some industrial and agricultural wastes are suitable for&lt;br&gt;
utilization in ceramic industries, these improves the properties and bringing down&lt;br&gt;
production cost of ceramics. The research develops ceramic tile from the compositions of&lt;br&gt;
kaolin (45wt%), feldspar (40-25wt%), quartz (15wt%), and coffee husk ash (5-15wt%)&lt;br&gt;
sintered in the 1075-1200oC. Densification behavior of ceramic tile samples were&lt;br&gt;
investigated using linear shrinkage, water absorption, apparent porosity, and bulk density&lt;br&gt;
measurement as a function of coffee husk ash (CHA) and sintering temperature.&lt;br&gt;
Mechanical properties of ceramic tile samples were characterized using Vickers&lt;br&gt;
microhardness and elastic young&amp;rsquo;s modulus measurement. CHA with (5-10wt%)&lt;br&gt;
replacement for feldspar result significant effect on sintering temperature, densification&lt;br&gt;
behavior and mechanical properties of ceramic tile. Optical investigation of microstructure&lt;br&gt;
indicated that generation of significant amount of viscous phase, surrounded other phase&lt;br&gt;
increase with increasing both in sintering temperature and CHA content. CHA with 5wt%&lt;br&gt;
substitution result enhanced properties of ceramic tile such as, water absorption (1.53%)&lt;br&gt;
and Vickers microhardness (12.6Gpa) at 1200oC and with 10wt% result water absorption&lt;br&gt;
(1.68%) and Vickers microhardness (9.5Gpa) at 1150&amp;deg;C sintering temperature.&lt;br&gt;
Furthermore, substituting 10wt% of feldspar by CHA lowers sintering temperature by&lt;br&gt;
150oC. Substitution of CHA with 15wt.% deteriorates both densification and mechanical&lt;br&gt;
properties of ceramic tile.&lt;/p&gt;</description>
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