K Geetha
Articles written in Bulletin of Materials Science
Volume 23 Issue 4 August 2000 pp 243-248 Refractory Cements
Ceramic joining through reactive wetting of alumina with calcium aluminate refractory cements
K Geetha A M Umarji T R N Kutty
Compositions in CaO-Al2O3 system have been prepared by gel-to-crystallite conversion method. Reactive powders of 1 : 2, 1 : 1, 2 : 1 and 3 : 1 of CaO and2O3 compositions were obtained by calcining the product at 800–1200°C. Fine grained powders were used as refractory cement for joining alumina ceramics. An optimum temperature of 1450°C for 4 h produced joints of satisfactory strength. The microstructure and X-ray phase analysis of the fractured joint surface clearly indicate reactive wetting of the alumina ceramics. This wetting enhances the joining of alumina substrates and can be attributed to the formation of Ca12Al14O33 liquid phase. The results are explained by using CaO-Al2O3 phase diagram.
Volume 23 Issue 6 December 2000 pp 491-494 Oxide Ceramics
Thermal expansion behaviour of barium and strontium zirconium phosphates
P Srikari Tantri K Geetha A M Umarji Sheela K Ramasesha
Ba1.5-xSrxZr4P5SiO24 compounds with
Volume 45, 2022
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Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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