摘要:
The present invention is to provide a storing container wherein Si does not drop onto a single crystal SiC substrate, and Si pressure distribution in an internal space can be made uniform. This storing container stores therein a single crystal SiC substrate to be etched by means of a heat treatment under Si vapor pressure. The storing container is formed of a tantalum metal, and has a tantalum carbide layer provided on an internal space side, and a tantalum silicide layer provided on the side further toward the internal space side than the tantalum carbide layer. The tantalum silicide layer supplies Si to the internal space. Furthermore, the tantalum silicide layer is different from adhered Si, and does not melt and drop.
摘要:
The present invention is a method for producing a silica container arranged with a silica substrate having a rotational symmetry, wherein the method comprises: a step of forming a preliminarily molded article having a prescribed shape by feeding a powdered substrate's raw material (silica particles) to an inner wall of an outer frame having sucking holes with rotating the frame, and a step of forming a silica substrate wherein the preliminarily molded article is aspirated from an outer peripheral side with controlling a humidity inside the outer frame by ventilating gases present in the outer frame with charging from inside the preliminarily molded article a gas mixture comprised of an O 2 gas and an inert gas and made below a prescribed dew-point temperature by dehumidification, and at the same time heated from inside the preliminarily molded article by a discharge-heat melting method with carbon electrodes, thereby making an outer peripheral part of the preliminarily molded article to a sintered body while an inner peripheral part to a fused glass body. With this, provided are a method for producing a silica container, having a high dimensional precision and containing extremely low amount of carbon and an OH group, with a low production cost by using main raw material powders comprised of a silica as its main component, and a silica container thereby obtained.
摘要:
An inspection method of vitreous silica crucibles, includes: a measurement step of measuring an infrared absorption spectrum or a Raman shift of a measurement point on an inner surface of the vitreous silica crucible; a determining step of predicting whether or not a surface-defect region occurs at the measurement point based on an obtained spectrum to determine a quality of the vitreous silica crucible.
摘要:
The invention relates to a crucible (1) for the formation of a crystalline material by solidification by growth on seed, comprising a base (2), at least one side wall (3) orthogonal to the base (2) of the crucible (1), and means for representing the position of at least one seed intended to be positioned at the base of the crucible, said seed comprising at least first and second faces orthogonal to the base of the crucible. The representation means comprise at least two markers (4) that extend over the inner face of the at least one side wall (3) along an axis orthogonal to the base of the crucible (1). The respective positions of at least two of the markers on at least one of the side walls (3) define, in the crystalline material, a first cutting plane tangent to the first face of said seed and a second cutting plane tangent to the second face of said seed.
摘要:
An inspection method of vitreous silica crucibles, includes: a measurement step of measuring an infrared absorption spectrum or a Raman shift of a measurement point on an inner surface of the vitreous silica crucible; a determining step of predicting whether or not a surface-defect region occurs at the measurement point based on an obtained spectrum to determine a quality of the vitreous silica crucible.
摘要:
The present invention provides a vitreous silica crucible which inhibits a deformation even when used under a high temperature condition for a long time, and a method for manufacturing the same. The vitreous silica crucible comprises: a substantially cylindrical straight body portion having an opening on the top end and extending in a vertical direction, a curved bottom portion, and a corner portion connecting the straight body portion with the bottom portion and a curvature of which is greater than that of the bottom portion, wherein, the vitreous silica crucible comprises a transparent layer on the inside and a bubble layer on the outside thereof, a compressive stress layer in which compressive stress remains in the inner surface side of the transparent layer, and a tensile stress layer in which tensile stress remains and is adjacent to the compressive stress layer at a gradual rate of change of stress.
摘要:
Devices and methods for manual and high-throughput protein crystal growth and growth of other biological and organic crystals. A microplate includes a plurality of cells and a frame that defines the cells in the microplate. In each cell there is at least one well open at top. Each well in a cell may be enclosed at bottom, or it may be open at bottom, in which case the well bottom may be sealed by a separate part, which may be, e.g., a separate film or plate (e.g., of plastic, glass or metal) or a molded part.
摘要:
Buckling of a vitreous silica crucible 12 or inward fall of a sidewall 15 is effectively suppressed. The vitreous silica crucible 12 includes the cylindrical sidewall 15 having an upward-opening rim, a mortar-shaped bottom 16 including a curve, and a round portion 17 connescting the sidewall 15 and the bottom 16. In the vitreous silica crucible 12, the per-unit area thermal resistance in the thickness direction of the sidewall 15 is higher than that of the round portion 17.
摘要:
There is provided a method for manufacturing single-crystal silicon that makes it possible to reduce occurrence of dislocation of the single-crystal silicon when the single-crystal silicon is grown using a multi-pulling method for pulling up a plurality of pieces of single-crystal silicon from a material melt in an dentical crucible. Solving Means A method for manufacturing single-crystal silicon is directed to a method for manufacturing a single-crystal silicon (1) using the multi-pulling method for pulling up a plurality of pieces of single-crystal silicon (1) from a material melt (7) in an identical crucible (8) within a chamber by a Czochralski method, the method including the step of omitting at least a part of formation of a tail part of the single-crystal silicon (1) and separating the single-crystal silicon from the material melt, wherein an amount of addition of barium formed on an inner wall of crucible (8) is controlled within a certain range.