Patent application number | Description | Published |
20100077611 | METHOD OF MANUFACTURING CARBON ELECTRODE AND METHOD OF MANUFACTURING FUSED SILICA CRUCIBLE - A method of manufacturing a carbon electrode for melting an object to be melted by arc discharge, includes: a rubbing step of rubbing the surface of the carbon electrode before power is supplied with a rubbing material of the same type as the object to be melted. | 04-01-2010 |
20100095880 | Arc melting high-purity carbon electrode and application thereof - An arc melting high-purity carbon electrode is capable of forming stable arc at the time of arc discharge, and it is possible to produce a vitreous silica crucible with good properties, which does not cause local lack of the electrode and does not create black foreign materials or concave portions on the inner surface of the crucible. The arc melting high-purity carbon electrode is a carbon electrode used to heat and melt silica powder by arc discharge, in which the density of the carbon electrode is equal to or more than 1.60 g/cm | 04-22-2010 |
20100095881 | ARC DISCHARGE APPARATUS, APPARATUS AND METHOD FOR MANUFACTURING VITREOUS SILICA GLASS CRUCIBLE, AND METHOD FOR PULLING UP SILICON SINGLE CRYSTAL - The arc discharge apparatus comprises a plurality of carbon electrodes connected to respective phases of a power supply for heating a silica powder and causing it to fuse by generating arc discharge between the carbon electrodes. All of the carbon electrodes have a density in a range from 1.30 g/cm | 04-22-2010 |
20100162760 | METHOD OF PRODUCING VITREOUS SILICA CRUCIBLE - A method for manufacturing a quartz glass crucible has a deposition step of depositing quartz powder on an inner wall surface of a bottomed cylindrical mold, while rotating the mold, and a melting step of obtaining the quartz glass crucible by vitrifying the quartz powder deposited on the inner wall surface of the mold by heating and melting the quartz powder. In the deposition step, under a state where the quantity of electrostatic charge of the quartz powder is controlled to be within a range of 1.0 kV or below in absolute value, the quartz powder is applied to the inner wall surface of the mold, and the thickness of the quartz glass crucible is controlled by maintaining the density of the quartz powder deposition layer on the inner wall surface of the mold within a fixed range. | 07-01-2010 |
20100229599 | METHOD AND APPARATUS FOR MANUFACTURING VITREOUS SILICA CRUCIBLE - In order to provide method and apparatus for manufacturing a vitreous silica crucible with little mixing of foreign matter and stable arc during arc melting, the method and apparatus for manufacturing a vitreous silica crucible have a device which blows off air from the side of arc electrodes toward a melting space of a mold, and air discharge ports which discharge the air within the heating furnace, and perform forced supply of air into the melting space during melting to make the atmospheric pressure of the melting space higher than the surroundings, and preferably, form an air pressure difference of 100 Pa or more between the melting space and the surroundings, thereby performing melting. | 09-16-2010 |
20110214454 | METHOD OF MANUFACTURING CARBON ELECTRODE AND METHOD OF MANUFACTURING FUSED SILICA CRUCIBLE - A method of manufacturing a carbon electrode for melting an object to be melted by arc discharge, includes: a rubbing step of rubbing the surface of the carbon electrode before power is supplied with a rubbing material of the same type as the object to be melted. | 09-08-2011 |
20120131954 | APPARATUS AND METHOD FOR MANUFACTURING VITREOUS SILICA CRUCIBLE - There are provided an apparatus and a method for manufacturing a vitreous silica crucible which can prevent the deterioration of the inner surface property in the manufacturing process of a vitreous silica crucible. The apparatus includes a mold defining an outer shape of a vitreous silica crucible, and an arc discharge unit having electrodes and a power-supply unit, wherein each of the electrodes includes a tip end directed to the mold, the other end opposite to the tip end, and a bent portion provided between the tip end and the other end. | 05-31-2012 |
20120141622 | APPARATUS FOR MANUFACTURING VITREOUS SILICA CRUCIBLE - Provided is an apparatus for manufacturing a vitreous silica crucible which has a structure which can reduce gaps between a partition wall and electrodes inserted into through-holes formed in the partition wall while enabling electrodes to move to adjust a heating temperature of arc discharge. A plate-shaped partition wall | 06-07-2012 |
20120160155 | COMPOSITE CRUCIBLE, METHOD OF MANUFACTURING THE SAME, AND METHOD OF MANUFACTURING SILICON CRYSTAL - The purpose of the present invention is to provide a crucible which has high viscosity at high temperature, and can be used for a long time, and can be manufactured at low cost, and a method of manufacturing the same. The composite crucible | 06-28-2012 |
20120272682 | APPARATUS FOR MANUFACTURING VITREOUS SILICA CRUCIBLE - During fabrication of a vitreous silica crucible, contamination of the vitreous silica crucible due to wear particles and debris of components of an apparatus for manufacturing a vitreous silica crucible is reduced by preventing damage and wear of the components of the apparatus due to silica fume. The apparatus for manufacturing a vitreous silica crucible is divided into a lower section for accommodating a mold and a mold driving system and an upper section for accommodating an arc electrode driving system, wherein a sectioning member including one or more communication paths for allowing penetration of arc electrodes, thereby the air flow is controlled so as to reduce exchange between gas in the upper section and gas in the lower section. | 11-01-2012 |
20120272687 | APPARATUS FOR MANUFACTURING VITREOUS SILICA CRUCIBLE - Provided is an apparatus for manufacturing a vitreous silica crucible, which is capable of stably manufacturing a high quality vitreous silica crucible by stabilizing heat generation through an arc discharge. The apparatus for manufacturing a vitreous silica crucible includes a mold that defines a shape of a vitreous silica crucible, carbon electrodes that generate an arc discharge for fusing a silica powder molded body formed in the mold, and a power supply device that supplies power to the carbon electrodes. The power supply device includes a saturable reactor that is provided on a supply path of the power to the carbon electrodes and has variable reactance, and a control device that controls the power supplied to the carbon electrodes by changing the reactance of the saturable reactor. | 11-01-2012 |
20120318021 | APPARATUS FOR MANUFACTURING VITREOUS SILICA CRUCIBLE - Provided is an apparatus for manufacturing a vitreous silica crucible, which is capable of stably manufacturing a high quality vitreous silica crucible by stabilizing heat generation through an arc discharge. The apparatus for manufacturing a vitreous silica crucible includes a mold that defines a shape of a vitreous silica crucible, carbon electrodes that generate an arc discharge for fusing a silica powder molded body formed in the mold, and a power supply device that supplies power to the carbon electrodes. The power supply device includes a saturable reactor that is provided on a supply path of the power to the carbon electrodes and has variable reactance, and a control device that controls the power supplied to the carbon electrodes by changing the reactance of the saturable reactor. | 12-20-2012 |
20140352606 | SILICA GLASS CRUCIBLE AND METHOD FOR PRODUCING MONOCRYSTALLINE SILICON USING SAME - Buckling of a vitreous silica crucible or fall of a sidewall into the crucible is effectively suppressed. Furthermore, dislocations in a silicon single crystal are suppressed to enhance the yield of the single crystal. The vitreous silica crucible is used to pull single-crystal silicon and includes the cylindrical sidewall having an upward-opening rim, a mortar-shaped bottom including a curve, and a round portion connecting the sidewall and the bottom. The round portion is provided in such a manner that the curvature of the inner surface thereof is gradually increased from the sidewall toward the bottom in a section passing through the rotation axis of the vitreous silica crucible. | 12-04-2014 |