Application of transparent polycrystalline body with high ultrav

Details Application of transparent polycrystalline body with high ultrav Application of transparent polycrystalline body with high ultrav

1988-04-22

1991-01-08

Chaudhuri, Olik

Compositions: ceramic

Ceramic compositions

Refractory

501153, 264 65, 264 12, C04B 3502

Patent

active

049835556

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 0.4 microns to 0.8 microns and a transmittance at some wavelength in the wavelength 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. A number of applications of the magnesia-alumina spinel body are disclosed for which the material is advantageous.

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