公开(公告)号：EP0447390A4

公开(公告)日：1991-12-11

申请号：EP88908431

申请日：1988-11-22

Applicant: COORS PORCELAIN COMPANY DBA COORS CERAMICS COMPANY

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

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

CPC classification number: H01Q1/42 ,  C04B35/443

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