Oxidation resistance of Ni-base single crystal superalloy is substantially improved when melted using a CaO crucible compared to that an Al2O3 crucible. In order understand the underlying mechanism, sulfur segregation at oxide/substrate interfaces was characterized aberration corrected scanning transmission electron microscope with energy dispersive X-ray spectroscopy (STEM-EDS) and three-dimen...

Crucible is the indispensable vessel in smelting of superalloy, and service life crucibles quite important to development superalloy. In order extend crucible for superalloy smelting, alumina-based are prepared by slip casting, mullite fibers used as reinforcement phase. The effect on microstructure property was studied. appropriate content beneficial comprehensive performance crucibles. mechan...

Vivek A. Sujan Steven Dubowsky Massachusetts Institute of Technology Department of Mechanical Engineering Cambridge, Massachusetts 02139 Abstract. The basic technology for a robotic system is developed to automate the packing of polycrystalline silicon nuggets into fragile fused silica crucible in Czochralski (melt pulling) semiconductor wafer production. The highly irregular shapes of the nugg...

A theoretical procedure for the creation of a stable drop-like static meniscus, appropriate for the growth of a single crystal tube, with a priori specified inner and outer radius, is presented. The method locates the controllable part p of the pressure difference across the free surface. It consists in a set of calculus, which leads to the determination of the melt column height between the ho...

he global ocean is the last physical frontier on Earth. Covering 70 percent of the planetary surface, it is the largest, most complex biome we know. The ocean is a huge, mobile reservoir of heat and chemical mass. As such, it is the " engine " that drives weather-climate systems across the ocean basins and the continents, directly affecting food production , drought, and flooding on land. Water...