Some aspects of silicate bonding with and without CO2

Somayajulu, B V and Mohan, Jatinder and Bhatnagar, S S (1961) Some aspects of silicate bonding with and without CO2. NML Technical Journal, 3 (3). pp. 15-19.

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The paper embodies results of comprehensive investigation work carried out on the hardening characteristics of silicate bonded sands with and without CO2, so as to assess the possibilities of effecting economics in the CO2 process of hardening moulds and crores by other gases such as oxygen, nitrogen and atmospheric air. The properties obtained in each case were compared with those exhibited by the conventional oil sand cores. It was found that any attempt to dilute the CO2 by air, oxygen or nitrogen tends to lower strength values of the sand mixtures. When air or oxygen is passed alone, the sand mix does not develop any strength at all. While hardening the silicate bonded sand by the application of heat alone, the binder requirement was more than when the sands were hardened by CO2 or a mixture of CO2 with other gases. A comparative study of the strength values obtained by various methods showed that the strength values obtainable with silicate bonded and dried specimens were comparable to and in fact higher than the values obtainable in the case of dried oil sand specimens. Addition of sucrose along with sodium silicate imparted still higher values of compressive strength. (Mr. B.V. Somayajulu, Junior Scientific Officer; Mrs Jatinder Mohan and S.S. Bhatnagar, Senior Scientific Officers, National Metallurgical Laboratory)

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Silicate bonded; hardening moulds-CO2 process
Divisions:Director Office
ID Code:1423
Deposited By:Dr. A K Sahu
Deposited On:09 Aug 2010 17:05
Last Modified:08 Feb 2012 12:49
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