Use of dilatometry to evalute the high temperature characteristics of silica in chromite sand
Chromite, Double skin, Glazing, Penetration, Steel casting
73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings
The steel casting industry incorporates chromite sand in their core rooms, mainly due to the desirable properties exhibited by the aggregate. Chromite sand provides a cheaper alternative to specialty aggregates such as Zircon, while reducing or eliminating casting defects associated with silica sand. However, chromite sand is associated with surface defects in heavy section steel castings, known as the double skin defect. One of the causes for this defect is the presence of impurities, such as silica or silicates, in the sand. The University of Northern Iowa Metal Casting Center conducted tests using dilatometry to analyze the high temperature characteristics of chromite at varying silica content. Additionally, sinter temperatures were calculated for the samples. The testing and results detailed may be useful to monitor chromite sand for their high temperature characteristics. The sinter temperature results can be compared with sand temperature curves from simulation software to evaluate casting applications for defects related to Chromite sand.
Material Science and Engineering
Original Publication Date
UNI ScholarWorks, Rod Library, University of Northern Iowa
Ravi, S.; Thiel, J.; Bryant, N.; Giese, S.; and Schneiter, T. J., "Use of dilatometry to evalute the high temperature characteristics of silica in chromite sand" (2018). Faculty Publications. 774.