C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/123
C04B 35/44 (2006.01) C04B 35/443 (2006.01) F41F 3/04 (2006.01) H01Q 1/42 (2006.01)
Patent
CA 1325511
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 wave length range between about 0.2 and about 0.4 microns of at least about 85 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 a high transmissivity of electro- magnetic 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. The sintered body is useful in a variety of applica- tions, including as a dome and window for missiles and launch tubes.
572399
Coubrough Lawrence E.
Green Kenneth Edward
Hastert James L.
Roy Donald W.
Trujillo Aurelio
Coors Porcelain Company Doing Business As Coors Ceramics Company
Gowling Lafleur Henderson Llp
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