Sumco Corporation

Japan Super Quartz Corporation

Shinsuke Yamazaki

Toshiaki Sudo

Koichi Suzuki

Takuma Yoshioka

Taira Sato

Shuichi Ikehata

Manabu Shonai

Takuji Nishi

Takaya Satou

Ken Kitahara

A method of manufacturing a vitreous silica crucible includes: a taking-out process of taking out the vitreous silica crucible from the mold, a honing process of removing the unfused silica powder layer on the outer surface of the vitreous silica crucible, and further comprising, after the taking-out process and before the honing process, a marking process of marking an identifier comprised of one or more groove line on the outer surface of the vitreous silica crucible, wherein the groove line after the honing process has a cross-sectional shape of an inverse trapezoid and a depth of 0.2 to 0.5 mm, and a width of 0.8 mm or more at the opening of the groove line. The groove line is formed by repeating shifting a focal point of a laser.

Vitreous silica crucible and method of manufacturing the same

The present invention provides a method of manufacturing a vitreous silica crucible including: a taking-out process of taking out the vitreous silica crucible from the mold, a honing process of removing the unfused silica powder layer on the outer surface of the vitreous silica crucible, and further comprising, after the taking-out process and before the honing process, a marking process of marking an identifier comprised of one or more groove line on the outer surface of the vitreous silica crucible, wherein the groove line after the honing process has a depth of 0.2 to 0.5 mm, and a width of 0.8 mm or more at the opening of the groove line.

The present invention provides a method of manufacturing a vitreous silica crucible having a transparent layer by use of waste vitreous silica. According to the present invention, there is provided a method of manufacturing a vitreous silica crucible for manufacturing a monocrystalline or polycrystalline silicon ingot, including a process of vitrifying a silica powder sintered body having a crucible shape in the whole or part of the thickness direction by arc fusing the silica powder sintered body from the inner surface side, wherein the method further includes at least one means of (1) depressurizing the silica powder sintered body from the outer surface side during the arc fusing, and (2) forming a synthetic vitreous silica layer on the inner surface by spraying synthetic silica powder onto the inner surface of the silica powder sintered body during the arc fusing.

Method of manufacturing vitreous silica crucible, vitreous silica crucible

Provided is a vitreous silica crucible, which is resistant to deformation and corrosion even when heated at high temperature for a long time. There is provided a vitreous silica crucible of the present invention including a substantially cylindrical straight body portion, a curved bottom portion, and a corner portion smoothly connecting the straight body portion and the bottom portion, wherein a wall of the vitreous silica crucible includes, from an inner surface side, a transparent layer and a bubble-containing layer, and a ratio of a thickness of the bubble-containing layer with respect to a thickness of the transparent layer at an intermediate position between an upper end and a lower end of the straight body portion is 0.7 to 1.4.

Vitreous silica crucible with specific ratio of transparent layer and bubble-containing layer thicknesses

The present invention provides a method of manufacturing a vitreous silica crucible having a transparent layer by use of waste vitreous silica, and silica powder suitable for the manufacturing. According to the present invention, there is provided a method of manufacturing granulated silica powder comprising a process for pulverizing waste vitreous silica generated in the manufacturing process of a crucible to form silica fine powder having an average particle diameter of 100 &#x3bc;m or less, and a process for granulating the silica fine powder to obtain granulated silica powder having an average particle diameter of 50 &#x3bc;m or more under helium atmosphere.

Growing community of inventors

Akita, Japan

Shinsuke Yamazaki