TRANSPARENT ALUMINUM OXYNITRIDE AND METHOD OF MANUFACTURE
Assignee
SURMET, CORP
Filed
Mar 20, 1985
Granted
Jan 19, 1988
Location
ACTON MA US
Abstract
An article of manufacture is provided comprising a polycrystalline cubic aluminum oxynitride having a density of at least 98% of theoretical density, and being transparent to electromagnetic radiation in the wavelength range from 0.3 to 5 micrometers with an in-line transmission of at least 20% in this range. A method of preparing the optically transparent aluminum oxynitride is also provided comprising the steps of forming a green body of substantially homogeneous aluminum oxynitride powder and pressureless sintering said green body in a nitrogen atmosphere and in the presence of predetermined additives which enhance the sintering process. Preferred additives are boron and yttrium in elemental or compound form.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Dec 16, 1985
Rescinded
Jul 23, 1987
Duration
1 year, 7 months
Inventor
- 1RICHARD L. GENTILMAN
Record Details
- Patent number
- US 4720362
- Application
- 06714223
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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