Heating – Processes of heating or heater operation
Patent
1981-04-02
1983-10-25
Camby, John J.
Heating
Processes of heating or heater operation
65DIG8, 219405, 432 65, 432237, 432253, 432262, F27D 700, F27D 500, F27D 112, F27B 1410
Patent
active
044116195
ABSTRACT:
Reaction vessels, furnace tubes, heating and cooling enclosures frequently have parts such as access ports, inlet tubes, inspection windows, etc. made of thermally transparent materials such as plastic, glass, quartz, oxides, nitrides and sulfides. When these parts extend outside the hot zone, they can act as "light pipes" carrying appreciable amounts of thermal radiation which can damage thermally sensitive gaskets or other materials used to secure external couplings or end closure flanges to these parts. Thermal radiation induced gasket damage is a frequent cause of stuck flanges and couplings. This problem is avoided by inserting a thermal radiation scattering region in the thermally transparent material between the hot zone and the end closure or gaskets. The thermal radiation is scattered and dispersed, so that the end zones receive less radiation and remain cooler. Milky quartz is a suitable scattering material for use with quartz furnace tubes or bell jars.
REFERENCES:
patent: 3626154 (1971-12-01), Reed
patent: 3772134 (1973-11-01), Rau
patent: 3927697 (1975-12-01), Baumler et al.
patent: 4055219 (1977-10-01), Orlandi et al.
patent: 4318889 (1982-03-01), Schiller
Introduction to Ceramics Second Edition, W. D. Kingery et al. John Wiley & Sons N.Y. 1976, pp. 646-703.
Handbook of Electronic Materials IF1 Plenum Data Corporation, Plenum Publishing Corp., New York 1971, vols. 1, 2, and 3.
Darnell Robert D.
Goetz Carl A.
Ingle William M.
Camby John J.
Handy Robert M.
Motorola Inc.
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