Method for producing hydrogen-doped silica powder,...

Details Method for producing hydrogen-doped silica powder,... Method for producing hydrogen-doped silica powder,...

2006-07-11

2006-07-11

Sample, David (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S133000, C501S154000, C117S200000, C065S017300

Reexamination Certificate

active

07074731

ABSTRACT:
It is an object of the present invention to provide a hydrogen-doped silica powder that is useful in the formation of a quartz glass crucible that is capable of pulling a silicon single crystal without causing a state having dislocations in the silicon single crystal due to peeling of quartz glass segment. It is a further object of the invention to provide a quartz glass crucible for use in pulling a silicon single crystal whose inner surface is formed by use of the hydrogen-doped silica powder and a producing method of the silica powder.In order to achieve the objects above, the present invention provides a hydrogen-doped silica powder for use in producing a quartz glass crucible for use in pulling a silicon single crystal, wherein the silica powder is made of synthetic silica powder, natural silica powder or a mixture thereof, with a hydrogen concentration being in the range of 1×1017to 5×1019molecules/cm3, and a producing method thereof, and a quartz glass crucible for pulling a silicon single crystal whose inner surface is made of the silica powders.

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