Mixed powder and a method for producing quartz glass using...

Details Mixed powder and a method for producing quartz glass using... Mixed powder and a method for producing quartz glass using...

2011-03-15

2011-03-15

Group, Karl E (Department: 1731)

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

C501S014000, C501S017000, C501S018000, C501S030000, C501S054000

Reexamination Certificate

active

07905932

ABSTRACT:
A mixed quartz powder contains quartz powder and two or more types of doping element in an amount of from 0.1 to 20 mass %. The aforementioned doped elements include a first dope element selected from the group consisting of N, C and F, and a second dope element selected from the group consisting of Mg, Ca, Sr, Ba, Sc, Y, Ti, Zr, Hf, the lanthanides and the actinides. The “quartz powder” is a powder of crystalline quartz or it is a powder of glassy SiO2particles. It is made form natural occurring quartz or it is fabricated synthetically. The “quartz powder” may be doped. The compounding ratio of the total amount (M1) of the aforementioned first elements and the total amount (M2) of the aforementioned second elements as the ratio of the number of atoms (M1)/(M2) is preferably from 0.1 to 20. Al as well as the aforementioned doped elements is preferably included in a mixed quartz powder of this invention.

REFERENCES:
patent: 4097295 (1978-06-01), Chyung et al.
patent: 4186021 (1980-01-01), Chyung et al.
patent: 5576253 (1996-11-01), Osafune et al.
patent: 6329309 (2001-12-01), Kanamaru et al.
patent: 9-95771 (1976-06-01), None
patent: 9-95772 (1976-07-01), None
patent: 10-139480 (1998-05-01), None
patent: 11-228172 (1999-08-01), None
Espacenet English language abstract for JP 11-228172, Aug. 24, 1999.
Espacenet English language abstract for JP 10-139480, May 26, 1998.

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