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Low density ceramic foams from alumina-sucrose using magnesium nitrate as a blowing and setting agent

Published online by Cambridge University Press:  09 September 2016

Sujith Vijayan ,
Praveen Wilson  and
Kuttan Prabhakaran Open the ORCID record for Kuttan Prabhakaran [Opens in a new window]
Sujith Vijayan
Affiliation:
Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram 695 022, India
Praveen Wilson
Affiliation:
Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram 695 022, India
Kuttan Prabhakaran*
Affiliation:
Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram 695 022, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effect of magnesium nitrate on the thermo-foaming of powder dispersions in molten sucrose for the preparation of alumina foams has been studied. The magnesium nitrate decreases the melting point of sucrose from 180 to 160 °C and acts as a blowing and setting agent. The foaming time and setting time decreases with an increase in foaming temperature as well as an increase in magnesium nitrate concentration. The rapid foaming followed by foam collapse is observed beyond 140 °C. The accelerated foaming and setting is due to an increase in the rate of –OH condensation because of the catalytic effect of H+ generated by the hydrolysis of magnesium nitrate. The porosity of alumina foam increases while cell size and grain size decrease with an increase in magnesium nitrate concentration. A change in foam structure, from partially interconnected cellular to completely interconnected reticulate-like, occurs when the magnesium nitrate concentration increase from 4 to 8 wt%.

Keywords

ceramicfoamporosity
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 19 , 14 October 2016 , pp. 3027 - 3035
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Copyright
Copyright © Materials Research Society 2016 

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