Apparatus and method for heating materials with a laser heat sou

Details Apparatus and method for heating materials with a laser heat sou Apparatus and method for heating materials with a laser heat sou

1985-03-21

1987-06-09

Paschall, M. H.

Electric heating

Metal heating

By arc

219349, 219121LP, 219121LQ, 219121FS, 219121LM, B23K 2600

Patent

active

046721690

ABSTRACT:
An apparatus and method for heating materials with photoelectric radiant energy include directing photoelectric radiant energy onto a reflective conical member positioned at one focal line of an ellipsoidal reflective surface. The radiant energy is dispersed by the conical member and directed to the reflective wall. Radiant energy is further reflected by the ellipsoidal surface to an opposite focal line creating an area of intense radiant energy. Materials to be heated are introduced into the area of intense photoelectric radiant energy. Embodiments of the present invention are applicable to reacting silane and ammonia to form silicon nitride by laser pyrolysis.

REFERENCES:
patent: 3427435 (1969-02-01), Webb
patent: 3817710 (1974-06-01), Mizutani et al.
patent: 4058699 (1977-11-01), Van Bloten
patent: 4188519 (1980-02-01), Berg
patent: 4547650 (1985-10-01), Arditty et al.

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