US3644655A - Radiation protective jacket for a vacuum furnace - Google Patents

Radiation protective jacket for a vacuum furnace Download PDF

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Publication number
US3644655A
US3644655A US52794A US3644655DA US3644655A US 3644655 A US3644655 A US 3644655A US 52794 A US52794 A US 52794A US 3644655D A US3644655D A US 3644655DA US 3644655 A US3644655 A US 3644655A
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US
United States
Prior art keywords
metal
protective jacket
foils
vacuum furnace
layers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US52794A
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English (en)
Inventor
Helmut Vollmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Balzers Patent und Beteiligungs AG
Original Assignee
Balzers Patent und Beteiligungs AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19691934965 external-priority patent/DE1934965C/de
Application filed by Balzers Patent und Beteiligungs AG filed Critical Balzers Patent und Beteiligungs AG
Application granted granted Critical
Publication of US3644655A publication Critical patent/US3644655A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/08—Means for preventing radiation, e.g. with metal foil

Definitions

  • ABSTRACT A radiation protective jacket comprises a multiple number of layers of metal foil which are spaced apart by metal wires such as molybdenum wires.
  • the jacket is arranged around the goods to be treated within a vacuum furnace to enclose the workspace and it is supported in the furnace on supporting elements which are held from a holder, for example, which is mounted adjacent the top of the interior of the furnace.
  • An electrical heating coil is stretched to extend around the materials to be treated within the center of the radiation jacket.
  • INVENTOR Helmut Vollmer ATTORNEYS RADIATION PROTECTIVE JACKET FOR A VACUUM comprises a plurality of layers of metal foil which are spaced FURNACE apart by the manner in which they are mounted or by interd' t tal b tw SUMMARY O THE I IO me 1a e me wires arranged e een ad acent layers
  • This invention relates in general to the construction of radiation protective devices and, in particular, to a new and useful radiation protective jacket formed as an arrangement of atplurality of metal foil layers spaced apart by wire spacing elements and which is arranged within a vacuum furnace to enclose the working space thereof.
  • Vacuum furnaces nowadays are required to have a large working space, particularly for testing, annealing, degassing or v soldering in a vacuum of large workpieces, such as parts of vehicles, and particularly air and space vehicles and satellites.
  • large workpieces such as parts of vehicles, and particularly air and space vehicles and satellites.
  • furnaces For economic operation, such furnaces have to be quickly heatable and coolable, which means that they should not have great heat capacity. They also have to be safe in operation in order to prevent long periods I of idleness due to frequent repairs.
  • the working space of a vacuum furnace is surrounded by one or several, usually cylindrical, jackets of heat reflecting sheet metal material and the front sides of the cylindrical working space are covered by radiation protective sheets.
  • Suitable materials for the radiation protective sheets were metals maintaining their stability in the desired furnace temperature.
  • Tungsten, tantalum or molybdenum are used for high-temperature furnaces.
  • the radiation-protective sheets become expensive due to the high price of the metals of which they are made and because of their weight. They can only be mounted or removed from the furnace with extreme care, and by the use of lifting devices, when cleaning or repair or similar maintenance operations become necessary.
  • Tungsten and molybdenum parts because of their brittleness, frequently cause cracking and ruptures. Repairs are required rather frequently because the radiation protective cylinders easily warp under the high temperatures in the furnace space.
  • a radiation protective jacket of a vacuum furnace which does not have the disadvantages of the prior art.
  • the jacket comprises an arrangement of heat reflecting surfaces enclosing the workspace of a vacuum furnace and it includes a frame of heat-resistant material to which a plurality of layers of metal foils is secured.
  • the multiple layers of foils have proved to give a very effective radiation protection.
  • a radiation protective jacket comprising metal foils arranged in layers is easy to manufacture and, compared to the heavy metal cylinders which have been used up to the present time, they provide an enormous weight reduction in the protective shield formation by the factor of from three to six.
  • the radiation protective jacket has a considerably lesser thickness than an arrangement of several sheet metal cylinders of equal effectiveness and this results in an additional advantage of a considerably enlarged furnace workspace with the same boiler dimensions.
  • the main advantage of the invention is seen in the fact that the new radiation protective jacket is not substantially distorted even with the highest occurring temperatures.
  • a further object of the invention is to provide a vacuum furnace which includes a holder arranged within a furnace to support a radiation protective sleeve around the exterior of a work surface which is surrounded by a heating coil and wherein the protective sleeve comprises a plurality of layers of metal foil.
  • a further object of the invention is to provide a radiation protective shield which is simple in design, rugged in construction and economical to manufacture.
  • FIG. 1 is a transverse sectional view of a vacuum furnace having a radiation protective sleeve constructed in accordance with the invention.
  • FIG. 2 is an enlarged section of a portion of the shield indicated in FIG. 1.
  • the invention embodied therein, comprises a vacuum furnace boiler generally designated 1 of double-wall construction having an intermediate space la for circulation of a cooling medium, such as a liquid, therethrough.
  • the cover 2 for the boiler 1 also is of double-wall construction and a cooling medium may be circulated between the walls.
  • the vessel contains an interior support or stand surface 3 on which goods 4 to be treated in the furnace are supported by the use of supports 5.
  • An electric heating element or coil 6 extends around the working space and it is supplied with current by a current supply device 7.
  • a radiation protective jacket 8 is arranged in the furnace interior around the exterior of the heating element 6 and it is provided for the purpose of reflecting back to the work space the heat radiation coming from the heating element and from the heated goods 4.
  • the radiation protective jacket 8 is supported from a bracket or holder 9 and it is constructed of a plurality of layers of metal foil 1 1.
  • the protective shield 8 is supported from vertically extending rods 10 which also support the heating element 6 and the whole assembly is supported from the holder 9.
  • the foil protective shield 8 comprises eight separate layers of a thin tantalum foil 11 with molybdenum wires 12 inserted between the individual foils as distance pieces or spacers.
  • the foil package which fonns the jacket 8 encloses the interior space of the furnace and is secured to the supporting rods 10 at a location to be supported around the goods 4.
  • the easiest manner of installation is to sew the entire assembly of foils 11 with rods 12 to, the rods 10 by thin wires, such as individual holding wires 13.
  • the individual foil layers may also be sewed to one another with the thin wires 12 so as to impart better stability to the overall construction.
  • each foil layer 11 is less than 0.05 mm., whereby substantial savings in material is achieved with full effectiveness as a radiation reflector.
  • the spacing between the various foils 11 may be effected other than by the use of wire spacer elements, such as the wires 12. For example, then tubes or corrugated bands may be inserted between adjacent layers or the layers may be held such that they are spaced apart.
  • the front sides of the cylindrical furnace space may be constructed as radiation reflectors of known construction or foil packages may also be used for this purpose too.
  • three different assemblies of foils 14 are arranged adjacent the top of the workpiece 4 and three separate ones 15 are arranged adjacent the bottom. Each individual assembly of these groups of assemblies 14 and 15 may be constructed as indicated in FIG. 2.
  • a radiation protective jacket comprising a plurality of heat reflecting surfaces adapted to enclose the work space of a vacuum furnace, said surfaces being defined by a multilayer arrangement of metal foils, and frame means for supporting said metal foils, and metal wire means sewing together the individual layers of said metal foils and to the frame means.
  • a device according to claim 1, wherein said wires are molybdenum and said foil is tantalum.
  • a protective jacket according to claim 1, including spacer means spacing said foil layers apart.
  • a protective jacket according to claim 4, wherein said spacer means comprises individual wire elements.
  • a radiation protective jacket comprising a plurality of heat reflecting surfaces adapted to enclose the workspace of a vacuum furnace, said surfaces being defined by a multilayer arrangement of metal foils, frame means for supporting said metal foils, said frame means comprises at least one metal rod member, a plurality of metal wires located between adjacent

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Furnace Details (AREA)
US52794A 1969-07-10 1970-07-07 Radiation protective jacket for a vacuum furnace Expired - Lifetime US3644655A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691934965 DE1934965C (de) 1969-07-10 Aus mehreren Lagen einer Metallfolie aufgebauter Strahlungsschutzmantel für einen Vakuumofen

Publications (1)

Publication Number Publication Date
US3644655A true US3644655A (en) 1972-02-22

Family

ID=5739392

Family Applications (1)

Application Number Title Priority Date Filing Date
US52794A Expired - Lifetime US3644655A (en) 1969-07-10 1970-07-07 Radiation protective jacket for a vacuum furnace

Country Status (3)

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US (1) US3644655A (cg-RX-API-DMAC10.html)
FR (1) FR2054100A5 (cg-RX-API-DMAC10.html)
GB (1) GB1276396A (cg-RX-API-DMAC10.html)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973075A (en) * 1975-09-15 1976-08-03 The United States Of America As Represented By The United States Energy Research And Development Administration High temperature furnace
US4954685A (en) * 1987-07-31 1990-09-04 Tokyo Electron Limited Heating furnace for semiconductor wafers
US5987053A (en) * 1997-09-03 1999-11-16 Webb; Richard Dyson High temperature air cooled vacuum furnace
US20170074588A1 (en) * 2015-09-11 2017-03-16 T-M Vacuum Products, Inc. Vacuum furnace with heating vessel in multiple orientations and method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973075A (en) * 1975-09-15 1976-08-03 The United States Of America As Represented By The United States Energy Research And Development Administration High temperature furnace
US4954685A (en) * 1987-07-31 1990-09-04 Tokyo Electron Limited Heating furnace for semiconductor wafers
US5987053A (en) * 1997-09-03 1999-11-16 Webb; Richard Dyson High temperature air cooled vacuum furnace
US20170074588A1 (en) * 2015-09-11 2017-03-16 T-M Vacuum Products, Inc. Vacuum furnace with heating vessel in multiple orientations and method thereof

Also Published As

Publication number Publication date
FR2054100A5 (cg-RX-API-DMAC10.html) 1971-04-16
DE1934965A1 (de) 1971-01-28
GB1276396A (en) 1972-06-01
DE1934965B2 (de) 1972-08-17

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