Formation of filaments directly from an unconfined source of mol

Details Formation of filaments directly from an unconfined source of mol Formation of filaments directly from an unconfined source of mol

1976-11-30

1978-11-07

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

Utilizing centrifugal force or rotating forming zone

264164, 264165, 164 87, B01J 202

Patent

active

041246640

ABSTRACT:
The invention comprises methods and apparatus for forming filamentary material directly from a pendant drop of molten material, and provides for a significant improvement in the quench rate. A typical method of making filamentary material according to the invention, comprises the steps of: (a) heating a solid material, typically, a metal or metal alloy, so as to form a pendant molten drop of the material which is at a temperature within 25 percent of its equilibrium melting point in .degree.K, said molten material having a surface tension of 10 to 2500 dynes/cm. and a viscosity of 0.001 to 1.0 poise at said temperature; (b) rotating a hollow cylindrical member about its longitudinal axis at a peripheral speed in excess of 3 feet per second, said member having a circumferential, heat-extracting lip projecting from its inner periphery, and said lip having a narrow peripheral edge of arcute cross section; and, (c) bringing the surface of said pendant molten material drop and said peripheral edge of the lip into contact so as to withdraw a solidifying filament from the drop while maintaining the form and stability of the drop. Typically, said lip is located at one end of said cylindrical member. The heat-extracting lip may typically be substantially V-shaped, with the apical region of the V-shape comprising said narrow peripheral edge of the lip; and typically, said edge may possess at least one indentation disposed to attenuate said filamentary material into discontinuous fiber.

REFERENCES:
patent: 2825108 (1958-03-01), Pond
patent: 3838185 (1971-09-01), Maringer et al.
patent: 3843762 (1974-10-01), Sleigh
patent: 3861450 (1975-01-01), Mobley et al.
patent: 3863700 (1975-02-01), Bedell et al.
patent: 3881540 (1975-05-01), Kavesh
patent: 3881542 (1975-05-01), Polk et al.
patent: 3896203 (1975-07-01), Maringer et al.
patent: 3904344 (1975-09-01), Maringer et al.
"Method of Producing Rapidly Solidified Filamentors Castings" by Pond et al., Trans. of Metal Soc. of AIME, vol. 245, pp. 2475, 2476, Nov. 1969.

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