Ultrasonic testing of the hardening kinetics of epoxy resins used for foundry patterns
Journal Title: Archiwum Odlewnictwa - Year 2010, Vol 10, Issue 3
Abstract
The study presents the results of investigations on the hardening kinetics of modern pattern materials which, among others, include also epoxy resins. Tests were carried out using a new ultrasonic technique developed by the author of the present study. On the example of the EPO 999 resin, the run of the hardening process at temperatures of 10, 20 and 30oC was shown. This is the temperature range applied during production of foundry patterns. The time of the preliminary hardening amounted to 800 min at a temperature of 10oC, and to only 180 min at a temperature of 30oC. Using ultrasonic technique, the effect of temperature on the modulus of elasticity Ed of the examined resin was determined. The temperature has been observed to exert a linear effect on the value of the modulus Ed. When the resin pattern is preheated in the range of temperatures from 20 to 50oC, the value of the modulus Ed decreases by 30%. The drop in the value of the modulus Ed, as well as the resin hardness decreasing from 18 to 9,0HB at the increasing temperature reduce the applicability of this material for patterns operating at high temperatures (moulding sands).
Authors and Affiliations
J. Zych
Keywords
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