General Electric Company

Richard A Engler

Thomas R Anthony

James F Fleischer

Robert H Ettinger

Robert C DeVries

Diamond is deposited by chemical vapor deposition on two parallel substrates, by means of a plurality of filaments between said substrates. The substrates and filaments are in vertical configuration and the filaments are linear and spring-tensioned to compensate for thermal expansion and expansion caused by filament carburization. The apparatus includes at least one and preferably two temperature controlling means, usually heat sinks, to maintain substrate temperature in the range of 900.degree.-1000.degree. C., for optimum rate of diamond deposition.

Apparatus for synthetic diamond deposition including spring-tensioned

A plural substrate CVD apparatus for diamond crystal production utilizes spaced apart vertical, parallel, planar substrate panels with an electrical (direct current, D.C.) resistance filament heater therebetween. A hydrogen-hydrocarbon gas mixture flows between panels to come into contact with the heater and the panels to cause diamond crystal nucleation and growth on the substrate panels. The apparatus includes means for maintaining the spaced relationship of the heater from the substrate surfaces, comprising a rod member attached to one end of the heater and tensioned by a cable passing over a pulley member and attached to a weight.

Resistance heater for diamond production by CVD

Diamond is deposited by chemical vapor deposition on two parallel substrates, by means of a plurality of filaments between the substrates. The substrates and filaments are in vertical configuration and the filaments are prestressed to curve in a single plane parallel to the substrates, to allow for thermal expansion and expansion caused by filament carburization. The apparatus includes at least one and preferably two heat sinks to maintain substrate temperatures in the range of 900.degree.-1000.degree. C., for optimum rate of diamond deposition.

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Schenectady, NY, United States of America

Richard A Engler