Method and apparatus for forming refractory tubing

Details Method and apparatus for forming refractory tubing Method and apparatus for forming refractory tubing

C - Chemistry, Metallurgy

04

B

25/135, 148/1.6

C04B 35/64 (2006.01) B23K 26/067 (2006.01) B23K 26/12 (2006.01) C03B 23/04 (2006.01) C04B 35/653 (2006.01) C30B 13/24 (2006.01) H01J 9/24 (2006.01)

Patent

CA 1047743

ABSTRACT OF THE DISCLOSURE Refractory tubings, either in amorphous, polycrystal- line or single crystal form, are made by moving a preformed tub- ing of a refractory material and heating zone relative to each other, the heating zone providing sufficient heat to melt through the tubing and form a molten ring which is continuously advanced through the tubing. The heating zone is provided by focusing a plurality of laser beams in a manner to adjust the energy distri- bution of each beam to essentially equalize the absorption of the laser energy around the entire surface of the tubing. The tubings may be formed as single crystals by using appropriate seeds; and by controlling the rate of movement of the tubing sections on either side of the molten ring the wall thickness and diameter of the final tubing may be adjusted.

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