The success of metal-ceramic restorations depends on an optimal bond between metal and ceramic. This study evaluated the effect of 3 casting atmospheres on the metal-ceramic bond strength (MCBS) of 2 Ni-Cr alloys, with beryllium (Fit Cast V) and without beryllium (Fit Cast SB). Sixty acrylic resin patterns (8 mm long and 5 mm diameter) were obtained using a fluorocarbon resin matrix. Wax was us...

In this research experiment computational fluid dynamic (CFD) models were constructed, within Ansys Fluent TM v.R1, to investigate phenomena occurring during the Vertically Upwards Continuous Casting (VUCC) of 8 mm diameter, oxygen free copper (OFCu) for alterations casting speed. The simulated influence heat transported over a 0.1 air gap formed die was investigated and value wall transfer coe...

Abstract During the solidification of binary metal alloys, chemical heterogeneities at product scale over a long distance range (1cm-1m) develop and this has detrimental effect on the resulting mechanical properties of cast products. Macrosegregation is of great concern to alloy manufacturers and end users as this problem persist. In this study, the use of process parameters namely casting spee...

Bottom-up gated filling system was performed to produce worm wheel through a sand casting of zinc alloy. It symmetrical design in which two wheels were cast at once, the erected direction gravity and had gating molten alloy poured from below. The recovery rate designed mold cavity 60%. Casting analysis check that sequentially filled without turbulent flow as passed gate. Though speed initially ...

With the increasing demand for high-efficient continuous casting, parameter optimization during high-speed casting is critical. To clarify changes in flow characteristics a multistrand tundish and principles diversion wall, numerical investigation of an eight-strand billet was carried out this paper. The simulation results were validated with physical 1:3 water model experiment. show that, same...

Mold powders used in the continuous casting of steel contain the harmful CaF2 as a main substance developing toxic gases such as SiF4 and HF at elevated temperatures. In this study, three samples of I1, I2 and I3, which contained gypsum free Portland cement clinker with different percentages of Fe2O3 (5.68, 6.83, 8.02 ...

Many phenomena in continuous casting including the formation of surface defects are greatly affected by heat transfer in the mold. The interfacial slag layers between the solidifying steel shell and the mold wall dominates the resistance to heat removal and thus controls mold heat transfer. Surface defects, such as longitudinal cracks and star cracks have been associated with variation of slag ...