Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1983-05-02
1985-08-20
Lesmes, George F.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428408, 350 11, 423446, B32B 516
Patent
active
045364427
ABSTRACT:
Optical windows for hostile environments have been made from diamond and adamantine boron nitride compacts. The compact windows can comprise a single layer of large crystals bonded in a matrix. For example, they are made by exposing a sample of diamond (425-1700 micron) in a diamond and graphite matrix to high pressure-high temperature conditions (e.g., 50 Kbar at 1400.degree. C. to 85 Kbar at 1800.degree. C.).
A typical boron nitride reaction zone assembly (cell) is shown in FIG. 1, in which carbon heater tube 1 is surrounded by tantalum foil sleeve 2. The sample of pyrolytic boron nitride 3 is disposed between carbon discs 5, tantalum foil discs 4 and hot pressed boron nitride plugs 6.
The optical windows produced are capable of transmitting infrared light and visible light.
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Hall et al., Erosion Hardened Nose Tips for Improved Accuracy Re-Entry Vehicles 7/23/76.
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Electric Company, Re-Entry and Environmental Systems Division, Philadelphia, Pa. 19101.
Bovenkerk Harold P.
Corrigan Francis R.
Gigl Paul D.
Atkinson William M.
General Electric Company
Lesmes George F.
Little Douglas B.
Schroeder Robert R.
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