Magnesium aluminate transparent ceramic having low...

Details Magnesium aluminate transparent ceramic having low... Magnesium aluminate transparent ceramic having low...

2011-01-25

2011-01-25

Group, Karl E (Department: 1793)

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

C427S212000, C501S120000, C423S490000

Reexamination Certificate

active

07875311

ABSTRACT:
A ceramic having at least about 90% by weight magnesium aluminate and having a bulk scattering and absorption loss of less than about 1/cm at any wavelength in a range of about 0.23 to about 5.3 microns or 0.2/cm at any wavelength in a range of about 0.27 to about 4.5 microns. A method of making a ceramic by providing a plurality of particles having a magnesium aluminate core and a fluoride salt coating; heating the particles in an oxidizing atmosphere to a temperature in the range of about 400° C. to about 750° C.; and sintering the particles to form a solid ceramic.

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