Compositions: ceramic – Ceramic compositions – Refractory
Patent
1989-06-30
1991-03-19
Chaudhuri, Olik
Compositions: ceramic
Ceramic compositions
Refractory
501153, 264 12, 264 65, C04B 3502
Patent
active
050010930
ABSTRACT:
A transparent polycrystalline body having high ultraviolet transmissivity is provided. The body is preferably a sintered magnesia-alumina spinel body having a transmittance of at least 85 percent in the wavelength range from 0.3 microns to 0.8 microns and a transmittance at some wavelength in the wave length range between about 0.2 and about 0.4 microns of at least about 86 percent and a porosity of less than about 0.001 percent. The sintered body is produced by a two-step method comprising forming a closed porosity body from a spinel powder and subjecting the closed porosity body to a hot isostatic pressure treatment. The resulting body has high transmissivity of electromagnetic radiation in the range between about 0.2 microns and about 6 microns, is resistant to abrasion or erosion, does not substantially deteriorate after exposure to ultraviolet light, and has high strength.
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Hastert James L.
Roy Donald W.
Chaudhuri Olik
Coors Porcelain Company
Griffis Andrew
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