公开(公告)号：CA1325511C

公开(公告)日：1993-12-28

申请号：CA572399

申请日：1988-07-19

Applicant: COORS PORCELAIN COMPANY DOING

Inventor： ROY DONALD W ,  HASTERT JAMES L ,  COUBROUGH LAWRENCE E ,  GREEN KENNETH E ,  TRUJILLO AURELIO

IPC: C04B35/443 ,  H01Q1/42 ,  C04B35/44 ,  F41F3/04

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 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. The sintered body is useful in a variety of applications, including as a dome and window for missiles and launch tubes.