Experimental Determination of the Thermal Conductivity Coefficients of Gradient Mold
Author of the article:ZHANG Guowei;ZHAO Gaozhan;WANG Mingjie;DONG Ying
Author's Workplace：College of Material Science and Engineering,North University of China,Taiyuan 030051,China;59th Institute of China Weapons Industry,Chongqing 400000,China
Key Words：the resin sand the zircon sand the graphite powder Maxwell model thermal conductivity
Abstract：
Graphite powder and zirconium sand were added into resin sand, and thermal conductivity coefficients of sand mold was measured by thermal conductivity meter. The influence of the content of zirconium sand and graphite powder on the thermal conductivity of the mold was studied. Experimental verification was carried out and the thermal conductivity calculated by Maxwell model was compared. The results show that the thermal conductivity of the sand mold reached the maximum when graphite powder content is 8% and zirconium sand content is 30%, which is 90% higher than that of the resin sand mold. The grain size of mixed sand mold is 4 microns finer than that of resin sand mold. The tensile strength of the castings obtained by pouring the mixed sand mold is 3% ~4% higher than that of the resin sand mold, and the elongation decreased by 0.8%~0.9%.
