Apparatus for producing improved high strength filaments

Coating apparatus – With cutting – punching or tearing of work – Web or sheet work

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118 495, 148154, 277135, 427251, C23C 1302

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active

040318516

ABSTRACT:
Fabrication apparatus is described for improving the ultimate strength of boron and other high strength filaments. In the apparatus, a gradual cooling zone is placed at the exit end of the reaction zone to prevent the sudden thermal shock normally encountered when hot boron filaments exit into the ambient atmosphere. A preheating zone can be added prior to the entrance into the reaction zone if desired. Additionally, the entrance and exit ends of the reaction zone are sealed with a molten metal, such as tin, heated to elevated temperatures close to the reaction temperature. These molten metal electrodes tend to minimize deposition of weak boron due to a low temperature region immediately following the reactor entrance and help to eliminate sudden thermal shocks to the filaments at the exit.

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