Heating – Work chamber having heating means – Interior bell forms muffle
Patent
1988-05-16
1989-07-25
Yuen, Henry C.
Heating
Work chamber having heating means
Interior bell forms muffle
432248, 432249, 110336, F27D 2300, F27B 314
Patent
active
048508632
ABSTRACT:
The present device comprises an enclosing structure for a vacuum furnace hot zone. The enclosing structure, in a preferred embodiment, includes an outside wall (usually fabricated from stainless steel), and inside wall (usually fabricated from laminated graphite sheets) and layers of graphite felt located between the outside wall and the inside wall. The graphite felt is "cut back" so as to be shorter than both the outside wall and the inside wall, thereby creating a channel around the end of the enclosing structure. The present device further includes insert structure inserted into the channel and the insert structure comprises a backing of heat insulating rigidized material as well as a bonded front strip, in a preferred embodiment, fabricated from laminated graphite sheets. The insert seals and prevents any particles, emanating from the layers of loose fibered blanket of insulating material, from entering the hot zone, or other sections of the furnace, to contaminate the same.
REFERENCES:
patent: 3598378 (1971-08-01), Lundstrom
patent: 3940245 (1976-02-01), Smith, Jr. et al.
patent: 4013394 (1977-03-01), Witkin et al.
patent: 4039280 (1977-08-01), Kienow et al.
patent: 4151400 (1979-04-01), Smith, Jr. et al.
Cleaver William E.
Vacuum Furnaces System Corporation
Yuen Henry C.
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