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State of the art paper on development of electric porcelain insulators from Ugandan raw materials
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Mechanical Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Mechanical Metallurgy.
(English)Manuscript (preprint) (Other academic)
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5865OAI: oai:DiVA.org:kth-5865DiVA: diva2:10386
Note
QC20100706Available from: 2006-05-31 Created: 2006-05-31 Last updated: 2010-11-22Bibliographically approved
In thesis
1. Assessment of ceramic raw materials in Uganda for electrical porcelain
Open this publication in new window or tab >>Assessment of ceramic raw materials in Uganda for electrical porcelain
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Clay, quartz and feldspar are widely available in Uganda. The location and properties of various clay deposits are reported in the literature, but little is reported on feldspar and quartz deposits. In this work an extended literature on ceramics and porcelains in particular, is documented. Samples from two deposits of feldspar and two deposits of quartz are characterised and found to possess requisite properties for making porcelain insulators. Sample porcelain bodies are made from materials collected from selected deposits using different mixing proportions of clay, feldspar and quartz. Their properties in relation to workability, firing temperature, dielectric and bending strengths are studied. It is found that a mixture consisting of 30% Mutaka kaolin, 15% Mukono ball clay, 30% Mutaka feldspar and 25% Lido beach flint yields a body with highest mechanical strength (72MPa) and dielectric strength (19kV/mm) when fired at 1250°C. The strength (both mechanical and dielectric) is found to decrease with increasing firing temperature. At high firing temperatures, the undissolved quartz in the body decreased, the glass content increases and pores are formed. Mullite content on the other hand does not change at temperatures above 1200°C but there are significant differences in the morphologies of the mullite crystals in the samples. Optimum mechanical and electrical properties are found at maximum virtification and a microstructure showing small closely packed mullite needles.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. ii, 20 p.
Series
KTH/MSE--06/45--SE+MEK/AVH
Keyword
porcelain, characterisation, bending strength, dielectric strength, Uganda
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-4013 (URN)91-7178-408-X (ISBN)
Presentation
2006-06-02, Konferensrum K408, KTH, Brinellvägen 23, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101122Available from: 2006-05-31 Created: 2006-05-31 Last updated: 2010-11-22Bibliographically approved

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Citation style
  • apa
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More styles
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More languages
Output format
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