A novel method for quantitative phase determination of cristobalite in ceramic cores using differential scanning calorimeter

Abstract

The present research aims at developing a new quantitative thermal analysis method based on differential scanning calorimeter for determination of cristobalite phase content in ceramic cores. For this purpose, various control samples with different amounts of cristobalite phase were made based on the chemical composition of silica-based ceramic cores and analyzed via differential scanning calorimetry (DSC) technique. The surface area under the a ? b cristobalite transition peak in the DSC curves was calculated via numerical integral of the peaks area, and the ratio of this area to the samples weight (A/W) was calibrated by cristobalite content of the samples. Afterward, for determining the cristobalite content of some industrial samples, the DSC patterns were plotted, and the A/W ratio of these samples was determined by the same method. Then the A/W ratios of the industrial samples were fitted on the calibration line, and the cristobalite content was derived using the equation of the calibration line. The method showed good accuracy, and the error values of the estimated cristobalite content of the industrial samples were below 2 %.

Investigation on Nano-Fused Silica in Silica-Based Ceramic Cores for Investment Casting

“…Cristobalite plays a significant role in the silica based ceramic core for the investment casting [5]. Takayanagi and Katashima [6] studied the crystallization of the fused silica flour, indicating that the crystallization control of fused silica is the most important for preventing the hot deformation of the ceramic core used to make the hollow-shaped investment casting.…”

Effect of Pre-Added Cristobalite Content on the Properties of Silica-Based Ceramic Cores

“…Generally, additives, such as zircon, zirconium, corundum, cristobalite, mullite, which have effect on the phase composition of the pre-heated ceramic cores, are needed in the preparation of silica-based ceramic cores [3]. Many efforts have been carried out [4][5][6][7].…”

“…Cristobalite plays a significant role in the silica based ceramic core for the investment casting [5]. Kim et al [6] studied the crystallization of the fused silica flour, indicating that the crystallization control of fused silica is the most important for preventing the hot deformation of the ceramic core.…”