Electric heating – Metal heating – By arc
Patent
1986-03-25
1987-10-06
Paschall, M. H.
Electric heating
Metal heating
By arc
219121PE, 219121P, 432 13, 419 56, 419 45, B23K 1500
Patent
active
046984810
ABSTRACT:
A system to prevent, retard or reverse the decomposition of silicon carbide articles during high temperature plasma sintering. Preferably, the system comprises sintering a silicon carbide refractory or ceramic green body in a closed sintering environment, such as a closed tube, with strategic placement of the plasma torch or torches, exhaust outlet and tube. As sintering proceeds, a silicon vapor pressure builds up within the tube, retarding the decomposition of the silicon carbide body. The plasma torch, exhaust outlet, and tubes are positioned so that buoyant convective flow is maximized to increase the heat transfer and energy efficiency. In another embodiment, a "sacrificial" source of silicon carbide is placed into the sintering furnace. The silicon carbide in the sacrificial source starts to decompose before the silicon carbide refractory or ceramic article, creating a supersaturated atmosphere of silicon vapor species in the furnace. This prevents, retards or reverses the silicon carbide decomposition reactions and thus maintains the integrity of the refractory or ceramic article being sintered. Preferably, the sacrificial source is placed in a closed sintering environment along with the silicon carbide articles being sintered.
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"Test Furnace Achieves 2200.degree. C. (4000.degree. F.) in Air, Inert Atmospheres", Presented by Harper Electric Furnace Corp., Harper Highlights, vol. 5, No. 1, Spring 85.
Katz Joel D.
Kim Jonathan J.
Kennecott Corporation
Paschall M. H.
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