Electric heating – Heating devices – Resistive element: igniter type
Patent
1978-01-10
1981-04-28
Bartis, A.
Electric heating
Heating devices
Resistive element: igniter type
13 23, 13 25, 118726, 219427, 427 50, 427113, 4272481, 428408, 432265, H05B 312, F27B 2104, C23C 1312
Patent
active
042648033
ABSTRACT:
Resistance-heated vaporization boats for the vacuum vaporization of metals, such as aluminum, chromium, copper or the like, are made by machining a boat cavity in at least one side of a graphite bar. The bar is totally encapsulated over its entire outer surface, including the boat cavity, with a continuous coating of pyrolytic boron nitride (PBN). The PBN coating is removed from areas at both ends of the bar to provide electrical contact zones for connecting the bar to a power source. The sides and ends of the boat cavity have smooth contours without sharp corners and the ends of the cavity have a hemispherical configuration to resist longitudinal expansion of the PBN coating thereby preventing separation of the PBN coating from the surface of the graphite bar. The PBN coating is deposited from a gas at a temperature of 1750.degree. C. to 2300.degree. C. and has a thickness of at least 0.010 inch.
REFERENCES:
patent: 2665229 (1954-01-01), Schuler et al.
patent: 2962538 (1960-11-01), Alexander
patent: 3063858 (1962-11-01), Steeves
patent: 3152006 (1964-10-01), Basche
patent: 3372671 (1968-03-01), Chu
patent: 3430937 (1969-03-01), Spitzer
patent: 3452970 (1969-07-01), Mayer et al.
patent: 3541301 (1970-11-01), Gallet
patent: 3544486 (1970-12-01), Passmore
patent: 3576932 (1971-04-01), Biddulph
patent: 3609829 (1971-10-01), Carrell et al.
patent: 3658032 (1972-04-01), Kohler et al.
patent: 3724996 (1973-04-01), Montgomery
patent: 3986822 (1976-10-01), Lashway
patent: 4058579 (1977-11-01), Lashway
Bartis A.
Evans J. Hart
Union Carbide Corporation
LandOfFree
Resistance-heated pyrolytic boron nitride coated graphite boat f does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Resistance-heated pyrolytic boron nitride coated graphite boat f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resistance-heated pyrolytic boron nitride coated graphite boat f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-865765