Stock material or miscellaneous articles – Composite – Of bituminous or tarry residue
Patent
1987-04-01
1989-08-15
Henry, Jon W.
Stock material or miscellaneous articles
Composite
Of bituminous or tarry residue
350609, 428448, G02B 508, G02B 718
Patent
active
048568872
ABSTRACT:
A lightweight mirror comprises a silicon carbide (SiC) foam core having a bulk density of approximately five percent. The mirror further comprises two solid facesheets each of which is integrally formed upon a surface of the SiC foam core, the facesheets being comprised of SiC. Upon a machined surface of one or both of the facesheets a further layer of SiC is deposited to reinforce the SiC facesheet and to provide an optically polishable surface. This outer layer of SiC may be deposited by chemical vapor deposition (CVD) techniques. After depositing this reinforcing layer of SiC, the layer is machined and polished to provide a mirror surface having a desired flatness and optical quality.
REFERENCES:
patent: 4035065 (1977-07-01), Fletcher et al.
patent: 4142006 (1979-02-01), Choyke et al.
patent: 4214818 (1980-07-01), Choyke et al.
patent: 4388344 (1983-06-01), Shuskus et al.
patent: 4397901 (1983-08-01), Warren
patent: 4444467 (1984-04-01), Shuskus et al.
patent: 4501777 (1985-02-01), Rose
patent: 4657359 (1987-04-01), Thompson et al.
W. J. Choyke et al, "SiC: A New Material for Mirrors . . . ", Applied Optics, vol. 15, No. 9, pp. 2006-2007, Sep. 1976.
Brown Kenneth M.
Gresko Lawrence S.
Wakugawa Jason M.
Henry Jon W.
Hughes Aircraft Company
Karambelas A. W.
Streeter W. J.
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