Abstract: A carbon component having a hole therein and an outer surface covered with a ceramic coating, and a method for manufacturing the carbon component are provided. The carbon component includes two carbon plate members joined together. The hole is defined by a groove formed on a mating surface of at least one of the carbon plate members and a mating portion of the other of the carbon plate members, which opposes the groove. An inner surface of the hole including a surface of the groove is entirely covered with a ceramic coating.

Abstract: An apparatus for bottom pouring into an investment cast includes a container that holds a melted casting material, where the container moves from a first container position to a second container position. In the first container position, holes on a stationary nozzle are not exposed to the interior of the container, and the melted casting material remains in the container. In the second container position, holes on the stationary nozzle are exposed to the interior of the container, and the melted casting material flows out the bottom of the container through the stationary nozzle. A temperature detection device determines the temperature of the melted casting material, and a heating device heats the melted casting material to a specified temperature.

Abstract: This invention relates to a two or three-stage apparatus and method of use to produce high purity silicon, such as for use in solar panels and/or photovoltaics. The device of this invention includes a melting apparatus with a delivery device, a holding apparatus with a tipping or transfer mechanism, and at least one solidification apparatus for receiving a molten feedstock. The optimized designs of individual apparatuses function efficiently in combination to produce high purity silicon.

Abstract: Disclosed is a multilayer structured quartz glass crucible, for pulling up silicon single crystal, whose structure has at least three layers comprising: a translucent outer layer made of naturally occurring quartz glass and having a large number of pores, a translucent intermediate layer, made of synthetic quartz glass and having a large number of pores, and a transparent inner layer substantially free from pores and made of a synthetic quartz glass. Thermal convection within the silicon melt is suppressed by use of the quartz glass crucible, thereby preventing oscillation on the surface of the silicon melt. A method for producing the quartz glas crucible is also disclosed.

Abstract: A casting ladle for improving the technique in the pour process of metallurgical molding. The casting ladle includes a bowl portion that has a bottom wall and a peripheral wall. The peripheral wall extends upwardly from a perimeter edge of the bottom wall such that the peripheral wall and the bottom wall define an interior space. The present invention has an open top such that the interior space is adapted for receiving molten metal. A spout outwardly extends from the peripheral wall such that the spout is adapted for controlling pouring of the molten metal.

Abstract: The invention concerns a resistance-heated vaporizer boat for vaporizing metal. According to the invention, a reduced temperature is generated in the edge region, i.e., along the longitudinal edge of the vaporizer boat, such that there is only a very slight wetting tendency along this longitudinal edge. Consequently, the melt can be localized such that it cannot overflow over the longitudinal edges of the vaporizer boat, without a cavity necessarily having to be provided in the vaporization surface of the vaporizer boat. As a result, optimum wetting and constantly targeted vaporization of the metal upwards towards the area to be vapor-deposited are attained.

Abstract: A unibody, monolithic, one-piece negative draft crucible for a MBE effusion cell. The crucible maximizes capacity, uniformity and long term flux stability, and minimizes oval defects, depletion effects, and short term shutter-related flux transients. The invention also provides a method and mandrel apparatus for making a unibody containment structure, such as a crucible formed of PBN, having a negative draft, via chemical vapor deposition.

Abstract: In order to reduce concentrations of impurities in an inner layer of a quartz crucible for pulling a silicon single crystal which comprises an outer layer made of quartz glass and an inner layer formed on the inner surface of the outer layer, a migration-preventing layer is formed between the outer and inner layers, wherein the migration-preventing layer prevents migration of the impurities such as alkaline metals included in the natural quartz glass in the outer layer to the synthetic quartz glass in the inner layer.

Abstract: A unibody, monolithic, one-piece negative draft crucible for a MBE effusion cell. The crucible maximizes capacity, uniformity and long term flux stability, and minimizes oval defects, depletion effects, and short term shutter-related flux transients. The invention also provides a method and mandrel apparatus for making a unibody containment structure, such as a crucible formed of PBN, having a negative draft, via chemical vapor deposition.

Abstract: There is disclosed a crucible assembly comprising: (a) an electrically conductive tube having a first end portion and a second end portion and defining an opening in the surface of the tube, wherein the tube defines an imaginary horizontal line which bisects the cross-sectional dimension of the tube and an imaginary vertical line which bisects the cross-sectional dimension of the tube; and (b) at least one power connection area, operatively associated with the first end portion of the tube, wherein for the crucible assembly having only one power connection area associated with the first end portion, the one power connection area is positioned above the imaginary horizontal line on the same side of the horizontal line as the opening in the tube surface, wherein for the crucible assembly having at least two power connection areas associated with the first end portion, the at least two power connection areas permit coupling of at least two power cables.

Abstract: An inexpensive crucible capable of obtaining a high analytical accuracy is provided. A circular projection is formed in a portion above a portion having an intermediate height on an inner circumferential surface of the graphite crucible to prevent contamination of the sample gases.

Abstract: A lid for a susceptor in which a crystalline material is melted by induction heating to form a pool or melt of molten material from which a dendritic web of essentially a single crystal of the material is pulled through an elongated slot in the lid and the lid has a pair of generally round openings adjacent the ends of the slot and a groove extends between each opening and the end of the slot. The grooves extend from the outboard surface of the lid to adjacent the inboard surface providing a strip contiguous with the inboard surface of the lid to produce generally uniform radiational heat loss across the width of the dendritic web adjacent the inboard surface of the lid to reduce thermal stresses in the web and facilitate the growth of wider webs at a greater withdrawal rate.

Abstract: An enclosable vessel for containing a silicon nitride article during sintering in a furnace to protect the silicon nitride article from thermal decomposition and contamination reactions with furnace materials comprises a closeable walled container formed of a reaction bonded silicon nitride material having an opening to allow interior placement of the silicon nitride article within the walled container. This box is used to replace silicon nitride powder which has heretofore been used to cover silicon nitride articles during sintering.

Abstract: A pyrolytic boron nitride crucible is provided. The crucible contains at least five wall layers consisting of first and second wall layers. The thickness of each of the first wall layers is 5 to 100 microns and the thickness of each of the second wall layers is 1/50 to 1/1 of that of the first wall layer. The total thickness of the entire wall layers is 0.5 to 3 mm. The first wall layer is bonded to and laminated alternately with the second wall layer.

Abstract: A pyrolytic boron nitride crucible is provided. The crucible contains at least five wall layers consisting of first and second wall layers. The thickness of each of the first wall layers is 5 to 100 microns and the thickness of each of the second wall layers is 1/50 to 1/1 of that of the first wall layer. The total thickness of the entire wall layers is 0.5 to 3 mm. The first wall layer is bonded to and laminated alternately with the second wall layer.

Abstract: Vapor sources for vacuum evaporators in which the evaporation rate has hitherto been adjusted by varying the temperature of the vessel containing the evaporative substances, have a very large time constant, and an approximately exponential control characteristic. The invention substantially reduces the time constant in an effusion evaporator cell by providing that the rate is adjusted by means of a mechanical slide, preferably of boron nitride or graphite, placed in front of the vapor escape aperture or apertures of the evaporator vessel.

Abstract: A crucible useful for continuous preparation of single crystals with selected crystal orientation or for depositing thin films of crystalline materials such as silica on substrates such as graphite by the pendant drop growth (PDG) method, the crucible base being tapped with one or more capillary bores having a length equal to or greater than the retention height of the molten liquid used to prepare the crystal of film at the temperatures and pressures used, the crucible being improved by "capping" its bottom with a conical baffle plate supported by feet on the bottom of the crucible, the improved crucible providing single crystals having high dimensional regularity and containing no bubbles or unmelted inclusions and the single crystals being broadly useful in jewelry, horology, and electronics.

Abstract: A melting crucible for small amounts of material has a plurality of pouring openings for the discharge of material selectively from the crucible, or comprises a ring member which is connected to a lower crucible portion containing the material, and which has at least one pouring opening for selective discharge of material from the crucible portion.

Abstract: A crucible used with a precision casting device, especially used for dental purposes, which is vertically or axially divided into a plurality of segments, these segments being held together to form a complete crucible during heating and melting steps and readily released to discharge the contents downwards during casting step.

Abstract: A Joule effect electric furnace for goldsmith, dental and the like melting processes comprises a graphite crucible which constitutes by itself an electric resistance element suitable for the Joule effect heating and is connected to an electric power supply.

Abstract: The evaporation boat comprises superposed upper and lower sheets. The upper sheet includes a upwardly convexed central section and a pair of side sections bent back toward the central section and the lower sheet includes a downwardly convexed central section and a pair of side sections bent inwardly toward the upper sheet. The upper and lower sheets are superposed each other such that the central sections of the upper and lower sheets define a substantially closed chamber for accomodating source material to be evaporated, that slit shaped vapor passages are formed between the upper and lower sheets or the opposite sides of the chamber and that any straight line drawn between any point on the surface of the source material and any point in the passages intersects the inner wall of the upper or lower sheets.