Bonded sapphire, and method of making same

Details Bonded sapphire, and method of making same Bonded sapphire, and method of making same

1997-10-16

1999-08-24

Speer, Timothy M.

Stock material or miscellaneous articles

Composite

Of inorganic material

428701, 428702, 264 121, 264 17, 264235, 264345, B32B 1700

Patent

active

059423439

ABSTRACT:
A large, monolithic sapphire structure for use in mid-IR military applications, such as, for example, a window or screen for radar detection equipment. The structure is made by bonding together two or more smaller sapphire panes by a method including the steps of coating a surface of each of the panes with a magnesia vapor and contacting the magnesia-coated surfaces with each other in the presence of a hydrogen-containing gas at a temperature (e.g., about 1500.degree. C. and 2000.degree. C.) and for a time period (e.g., about 45 minutes to about ten hours) sufficient to form a continuous magnesia-alumina spinel interlayer bond between the panes.

REFERENCES:
patent: 5201977 (1993-04-01), Aoshima
patent: 5702654 (1997-12-01), Chen

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