C - Chemistry – Metallurgy – 30 – B
Patent
C - Chemistry, Metallurgy
30
B
148/1.3
C30B 13/00 (2006.01)
Patent
CA 1234035
ABSTRACT OF THE DISCLOSURE This invention provides a method for conversion of congruently melting polycrystalline fibers to single crystal fibers. The method is particularly useful for production of fibers ranging from about 30 µm to about 1,000 pm in diameter, which are capable of infrared (IR) transmission and of functioning in nonlinear optical applications. The polycrystalline fiber is converted to a single crystal fiber by creating a melt zone near one end of said polycrystalline fiber and then causing said melt zone to travel a length of said polycrystalline fiber fit least once, so that the fiber continuously melts and recrystallizes into a single crystal along the length to that such length becomes one continuous crystal. In another embodiment of the invention, the method described above is utilized to improve the surface characteristics of a single crystal. In yet another embodiment of the invention, the method disclosed above is utilized to produce a fiber comprised of a polycrystalline core surrounded by a single crystal sleeve or large grained crystal sleeve which evidences single crystal behavior. This method is particularly useful for production of fibers ranging from about 30 µm to 1,000 µm in diamter, which are capable of infrared (IR) transmission. If the sleeve is a sufficiently large proportion of the fiber produced, this method is particularly useful for production of fibers which may be capable of functioning in nonlinear optical applications.
460625
Harrington James A.
Pastor Antonio C.
Standlee Arlie G.
Turk Roger R.
Hughes Aircraft Company
Sim & Mcburney
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