Patent application number | Description | Published |
20100071417 | ARC DISCHARGE METHOD, ARC DISCHARGE APPARATUS, AND FUSED SILICA CRUCIBLE MANUFACTURING APPARATUS - An arc discharge method of the present invention includes the steps of: heating and melting a non-conductive object by arc discharge using a plurality of carbon electrodes in an output range of 300 to 12,000 kVA; and setting a ratio of the distance between a contact position at which the carbon electrodes come in contact with each other and a front end to the diameter of the carbon electrode during the start of the arc discharge to be in the range of 0.001 to 0.9. | 03-25-2010 |
20100071613 | METHOD AND APPARATUS FOR MANUFACTURING FUSED SILICA CRUCIBLE, AND THE FUSED SILICA CRUCIBLE - A method of manufacturing a fused silica crucible by heating and melting a vitreous silica powder compact shaped into a mold using arc discharge of electrodes arranged around a rotation shaft of the mold, includes the steps of: arranging the electrodes in a ring shape, and setting a ratio W/R of a horizontal distance W between the electrode front end and the surface of the vitreous silica powder compact to a vitreous silica powder compact opening radius R, for at least a predetermined time during arc heating, to be in the range of 0.002 to 0.98. | 03-25-2010 |
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 |
20100165347 | METHOD AND APPARATUS FOR DETECTING COLORED FOREIGN PARTICLES IN QUARTZ POWDER MATERIAL - Colored foreign particles contained in quartz powder material are detected in a high precision with the specified detection apparatus even when the colored foreign particles are pale colored foreign particles such as iron-based refuse, organic refuse and carbon-based refuse. | 07-01-2010 |
20100176530 | MOLD FOR PRODUCING SILICA CRUCIBLE - In a mold for use in the production of a silica crucible, a mold cover corresponding to a small-diameter thinned portion of an upper part of the silica crucible is detachably disposed on a mold substrate corresponding to a main body of the silica crucible, and the mold cover has a barrier function against arc heating, and an inner diameter of the mold cover is smaller than that of the mold substrate but larger than that of the silica crucible. | 07-15-2010 |
20100178374 | MOLD FOR PRODUCING SILICA CRUCIBLE - In a mold for use in the production of a silica crucible, a cylindrical rim member is engagedly supported through hooks to an inner side of an upper opening portion of the mold corresponding to an upper part of a silica crucible and an outer diameter of the rim member is smaller than an inner diameter of the mold but larger than an inner diameter of the silica crucible. | 07-15-2010 |
20100178375 | MOLD FOR PRODUCING SILICA CRUCIBLE - There is provided a mold for use in the production of a silica crucible by heat-fusing silica or quartz powder attached onto an inner wall of a rotating mold, wherein an inner side of an upper opening portion of the mold corresponding to an upper part of the silica crucible is ground to obtain a step portion and a ring-shaped heat insulating barrier member having an inner diameter smaller than that of the mold is disposed on the step portion through a hollow disk-shaped support member having an inner diameter equal to or somewhat larger than that of the heat insulating barrier member. | 07-15-2010 |
20100180815 | CRUCIBLE AND METHOD FOR PULLING A SINGLE CRYSTAL - A crucible for pulling a silicon single crystal has a double structure comprising a silica crucible and a graphite crucible covering an outside of the silica crucible, wherein the silica crucible is provided at its opening end portion with an inward falling prevention means for imparting a radially outward force to a body portion of the silica crucible. | 07-22-2010 |
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 |