Muffle furnace


Muffle furnace
An Automatic Oil Muffle Furnace, circa 1910. Petroleum is contained in tank A, and is kept under pressure by pumping at intervals with the wooden handle, so that when the valve B is opened, the oil is vaporized by passing through a heating coil at the furnace entrance, and when ignited burns fiercely as a gas flame. This passes into the furnace through the two holes, C, C, and plays under and up around the muffle D, standing on a fireclay slab. The doorway is closed by two fireclay blocks at E.

A muffle furnace (sometimes, retort furnace) in historical usage is a furnace in which the subject material is isolated from the fuel and all of the products of combustion including gases and flying ash.[1] After the development of high-temperature electric heating elements and widespread electrification in developed countries, new muffle furnaces quickly moved to electric designs.[2]

Today, a muffle furnace is (usually) a front-loading box-type oven or kiln for high-temperature applications such as fusing glass, creating enamel coatings, ceramics and soldering and brazing articles. They are also used in many research facilities, for example by chemists in order to determine what proportion of a sample is non-combustible and non-volatile (i.e., ash). Some digital controllers allow RS232 interface and permit the operator to program up to 126[citation needed] segments, such as ramping, soaking, sintering, and more. Also, advances in materials for heating elements, such as molybdenum disilicide offered in certain models by Vecstar, can now produce working temperatures up to 1800 degrees Celsius, which facilitate more sophisticated metallurgical applications.[citation needed]

The term muffle furnace may also be used to describe another oven constructed on many of the same principles as the box type kiln mentioned above, but takes the form of a long, wide, and thin hollow tube used in roll to roll manufacturing processes.[citation needed]

Both of the above mentioned furnaces are usually heated to desired temperatures by conduction, convection, or blackbody radiation from electrical resistance heating elements.[citation needed] Therefore there is (usually) no combustion involved in the temperature control of the system, which allows for much greater control of temperature uniformity and assures isolation of the material being heated from the byproducts of fuel combustion.

References

  1. ^ Bulletin - United States Geological Survey, Issues 47-54, 1889, pp. 180 (834)
  2. ^ Electric Muffle Furnace, C.A. Crowley, Popular Mechanics, 67:6, June 1937, pp. 941-945

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Look at other dictionaries:

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  • muffle furnace — noun : a furnace having its charge inside a muffle and the source of heat outside so that the charge has no contact with the flame …   Useful english dictionary

  • muffle furnace — Смотри муфельная печь …   Энциклопедический словарь по металлургии

  • muffle — /ˈmʌfəl / (say mufuhl) verb (t) (muffled, muffling) 1. Also, muffle up. to wrap or envelop in a cloak, shawl, scarf, or the like disposed about the person, especially about the face and neck. 2. to wrap with something to deaden or prevent sound:… …   Australian English dictionary

  • Muffle — A muffle furnace is (usually) a front loading box type oven or kiln for high temperature applications such as fusing glass, creating enamel coatings and ceramics. They are also used in many research facilities, for example by chemists in order to …   Wikipedia

  • Muffle — Muf fle, n. [F. moufle, prop., a mitten, from the resemblance in shape. See {Muffle}, v. t., {Muff}.] 1. Anything with which another thing, as an oar or drum, is muffled; also, a boxing glove; a muff. [1913 Webster] 2. (Metal.) An earthenware… …   The Collaborative International Dictionary of English

  • muffle — muffle1 /muf euhl/, v., muffled, muffling, n. v.t. 1. to wrap with something to deaden or prevent sound: to muffle drums. 2. to deaden (sound) by wrappings or other means. 3. to wrap or envelop in a cloak, shawl, coat, etc., esp. to keep warm or… …   Universalium

  • furnace — A stovelike apparatus containing a chamber for heating, melting, or fusing. dental f. 1. a f. used to eliminate the wax pattern from the investment mold prior to casting in metal; 2. a f. used to fuse and glaze dental porcelains. muffle f. 1. an… …   Medical dictionary

  • furnace — Synonyms and related words: Seger cone, Torrid Zone, acid kiln, atomic pile, blacksmith shop, blast furnace, bloomery, boiler, bottle gas stove, breeder reactor, brickkiln, bricks, burner, butane stove, calefactor, caliduct, cement kiln, chain… …   Moby Thesaurus

  • muffle — muf·fle (mufґəl) a part of a furnace, usually removable or replaceable, in which material may be placed for processing, without exposing it to the direct action of the heat source …   Medical dictionary


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