Synthesis of Low Expansion Material for Coating of High Tension Electrical Insulators

Haroon Mahmood, M. A. Tindyala


Increase in flexural strength of insulators used for supporting high tension electrical cables is investigated here. A novel low expansion material, Cordierite, is synthesized for its use as a coating for insulators. Cylindrical shaped rods of cordierite were prepared from mixture of alumina, kaolin, talc, silica, potassium feldspar and bauxitic clay in different proportions by ball milling. These rods were slipcast, dried and were sintered at 1350°C and 1400°C. X-ray fluorescence was used for the determination of mineralogical composition of the raw materials. From the XRD analysis of the sintered rods it was concluded that the sample of composition 34.1% Kaolin, 19.94% Alumina, 41.62% Talc and 4.34% Silica, sintered at 1400°C formed the largest amount of cordierite i.e. 80.28% while dilatometery test revealed percentage linear change of 0.168.

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ISSN (Print): 2070-9900   ISSN (Online): 2411-6319