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Reinforced ceramic fiber enclosure and method of making same
| Details |
Inventors: Holbeck, John H.; Roy, Richard D.;
Assignee: Degussa-Ney Dental, Inc. (Bloomfield, CT)
Primary Examiner: Copenheaver; Blaine
Assistant Examiner: Singh; Arti R.
Attorney, Agent or Firm:
A reinforced ceramic fiber enclosure for muffle furnaces and the like defining a cavity therewithin includes a perforate metallic skeleton defining at least a portion of the peripheral wall of the enclosure and fibrous insulation encapsulating the skeleton with fibers of the insulation extending through the perforations of the skeleton. In some embodiments the enclosure is of rectangular cross section with base, top and side walls. The top and side walls generally extend over only a portion of the length of the enclosure, and mounting and support flanges are desirably provided on at least the front end of the skeleton. To make the enclosure, the skeleton is supported on the exterior of a vacuum mold in spaced relationship thereto, and the mold and skeleton are immersed in slurry of ceramic fibers and a bonding agent therefor. The vacuum drawn through the mold causes the fibers and bonding agent to deposit on the mold and encapsulate the skeleton with fibers extending through the perforations of the skeleton. |
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DETAILED DESCRIPTION It has now been found that the foregoing and related objects may be readily attained in a reinforced ceramic fiber enclosure for muffle furnaces and the like defining a cavity therewithin.
The enclosure comprises a perforate metallic skeleton defining at least a portion of the peripheral wall of the muffle and having front and rear ends, and fibrous insulation encapsulating the skeleton with fibers of the insulation extending through the perforations of the skeleton.
Generally, the enclosure is of rectangular cross section with base, top and side walls.
In larger models, the base wall of the skeleton extends substantially over the length of the base wall of the enclosure, and the skeleton extends over only a portion of the length of the top and side walls of the enclosure.
The enclosure will normally include a back wall, and the skeleton may include a perforate back wall.
Desirably, the skeleton has an outwardly extending flange at the front end of the enclosure for attachment to the support structure of a muffle furnace or the like.
The skeleton also includes an outwardly extending flange at the rear end thereof, and desirably includes a base wall with depending flanges extending along the length of the sides of the bottom of the enclosure.
In the method of making the ceramic fiber enclosure for muffle furnaces and the like, the steps comprise forming a perforate metallic skeleton defining at least a portion of the desired peripheral configuration for the enclosure.
The skeleton is supported on the exterior of a vacuum mold and in spaced relationship thereto, and the mold and skeleton are immersed in a slurry of ceramic fibers and a bonding agent therefor.
A vacuum is drawn through the mold to cause the fibers and bonding agent to deposit on the mold and encapsulate the skeleton with ceramic fibers extending through the perforations of the skeleton.
The fibers and bonding agent deposited on the mold are dried to provide a form-sustaining structure which is then removed from the mold
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Manufacturing Materials 
