EP0477511B1 - Heizkammer und Verfahren zu ihrer Herstellung - Google Patents

Heizkammer und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP0477511B1
EP0477511B1 EP19910113416 EP91113416A EP0477511B1 EP 0477511 B1 EP0477511 B1 EP 0477511B1 EP 19910113416 EP19910113416 EP 19910113416 EP 91113416 A EP91113416 A EP 91113416A EP 0477511 B1 EP0477511 B1 EP 0477511B1
Authority
EP
European Patent Office
Prior art keywords
heating chamber
layer
heating
precipitated
graphite
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
EP19910113416
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0477511A1 (de
Inventor
Klaus Müller
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.)
Airbus Defence and Space GmbH
Original Assignee
Daimler Benz Aerospace 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
Application filed by Daimler Benz Aerospace AG filed Critical Daimler Benz Aerospace AG
Publication of EP0477511A1 publication Critical patent/EP0477511A1/de
Application granted granted Critical
Publication of EP0477511B1 publication Critical patent/EP0477511B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/62—Heating elements specially adapted for furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/02—Surface coverings of combustion-gas-swept parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B17/00—Furnaces of a kind not covered by any of groups F27B1/00 - F27B15/00
    • F27B17/02—Furnaces of a kind not covered by any of groups F27B1/00 - F27B15/00 specially designed for laboratory use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0804—Non-oxide ceramics
    • F05C2203/0808—Carbon, e.g. graphite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres

Definitions

  • the invention relates to a heating chamber for heating systems for the controlled melting of metallic workpieces and samples, consisting of a cylindrical container, the wall of which consists of heating coils made of an electrically conductive material and of an insulation surrounding the heating coils, and also relates to a method for producing such a heating chamber.
  • HFT turbine blades Heating Facility
  • the turbine blades are individually introduced into a heating chamber of the type mentioned at the outset and melted in a controlled manner in the latter and then cooled.
  • the heating chambers used usually consist of a spirally wound tantalum wire, on which beads made of aluminum oxide ceramics are drawn for insulation. By melting these beads on the tantalum wire, caused by the evaporation of the sample materials that are in the heating chamber, such a heating chamber can easily lead to electrical short circuits and thus to the failure of the entire system.
  • the object of the invention is therefore to design a heating chamber of the type mentioned at the outset in such a way that a reliable operating sequence is ensured and, moreover, that the specified temperature or temperature distribution is maintained as precisely as possible. It is also an object of the invention to provide a method for producing such a heating chamber.
  • the problem is solved by a heating chamber with the characterizing features of claim 1.
  • the heating chamber according to the invention also has the advantage that it can deliver a uniformly high heating output over a longer period of time.
  • EP-A-0 193 192 has already disclosed a production process for vapor deposition crucibles made of pyrolytic boron nitride, in which this boron nitride is deposited from the gas phase onto a graphite mold, the mold is removed again after the vapor deposition process has ended and the crucible obtained in this way made of pure boron nitride does not have a heating device integrated into the crucible wall, as is the case with the heating chamber according to the invention. Rather, in order to vaporize materials for epitaxial processes, this known crucible must additionally be provided with an external heating spiral, for example made of tantalum wire, in which the problem already described can occur.
  • FIGS. 1a to c the manufacture of the inner wall layer 1 of the heating chamber, which consists of pyrolytic boron nitride, is shown.
  • a negative form consisting of a graphite mandrel 2
  • Boron nitride 3 is deposited on this in a vacuum evaporation system from the gas phase and then, also by vapor deposition, a graphite layer 4 is deposited, the upper edge surface and the end surface being covered by a corresponding one cover protected, not vaporized with graphite.
  • the resulting blank 5 is removed from the mandrel 2 after solidification and cooling.
  • FIGS. 2a to c The further stages of the manufacturing process are shown in FIGS. 2a to c.
  • the already cylindrical blank 5 has an initially continuous coating 4 made of graphite on the inner boron nitride carrier layer 1. Spiral heating tracks 6 are milled into these mechanically, as shown in FIG. 2b.
  • a second layer 7 of boron nitride two contact shells 9, 10 made of carbon fiber-reinforced carbon (CFRP) are placed on the radially divided lower edge strips 8, 8 'of the graphite layer which have been left open during sealing by a corresponding cover a lead wire 11, 12 made of tantalum was previously soldered for the power supply. The latter takes place at a temperature of approximately 2500 ° C.
  • the two contact shells 9 and 10 are glued to the divided conductor tracks 8 and 8 ′ using a graphite adhesive.
  • Fig. 3 shows the installation of the finished heating chamber 13 in a high temperature heating system.
  • the heating chamber 13 is inserted into a support tube 14 made of tantalum sheet metal and is fixed in the radial direction in this by an insulating ring 15 which bears against the contact shells 9 and 10 from the outside.
  • the support tube 14 is surrounded by several layers 16 of a tantalum foil.
  • the connecting wires 11 and 12 are provided with an insulation 17, 18 made of aluminum oxide beads, to an electrical supply unit, not shown in the figure.
  • the heating chamber 13 is through a flange 19th closed, which also serves as a holder for a workpiece to be treated.
  • the heating chamber described above can also be extended period of time at temperatures up to 2000 o C operated, without causing mechanical failure or thermal output to phenomena which would adversely affect the production process of a workpiece.
  • the heating device variable By vapor deposition of the graphite layer and the subsequent shaping of the heating coils, it is possible to make the heating device variable, the resistance can be changed by varying the layer thickness and the temperature distribution in the heating chamber can be influenced in a targeted manner by the shape of the milled tracks. In this way, a heating chamber with a particularly high power density can be produced, which is suitable, inter alia, for use in a system for processing and directional solidification of turbine blades.
  • the advantage here is the pyrolytic coating of the heating tracks, the heater is encapsulated and resistant to any evaporation of the sample materials.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physical Vapour Deposition (AREA)
  • Furnace Details (AREA)
EP19910113416 1990-09-27 1991-08-09 Heizkammer und Verfahren zu ihrer Herstellung Expired - Lifetime EP0477511B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4030540 1990-09-27
DE19904030540 DE4030540C1 (enrdf_load_stackoverflow) 1990-09-27 1990-09-27

Publications (2)

Publication Number Publication Date
EP0477511A1 EP0477511A1 (de) 1992-04-01
EP0477511B1 true EP0477511B1 (de) 1995-07-05

Family

ID=6415073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910113416 Expired - Lifetime EP0477511B1 (de) 1990-09-27 1991-08-09 Heizkammer und Verfahren zu ihrer Herstellung

Country Status (2)

Country Link
EP (1) EP0477511B1 (enrdf_load_stackoverflow)
DE (1) DE4030540C1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103192062A (zh) * 2013-04-01 2013-07-10 东方电气集团东方汽轮机有限公司 一种用于高温合金单晶叶片制造的模壳

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA918247A (en) * 1970-04-28 1973-01-02 United Aircraft Corporation Single crystal casting
DE3422333C2 (de) * 1984-06-15 1986-04-24 Seico Industrie-Elektrowärme GmbH, 3012 Langenhagen Isolierte Wärmekammer, insbesondere Hochtemperatur-Anlagen
DE8431735U1 (de) * 1984-10-30 1985-02-07 Linn Elektronik GmbH, 8459 Hirschbach Schmelztiegel zum schmelzen kleiner mengen eines metalles oder einer metall-legierung
JPS61201607A (ja) * 1985-02-28 1986-09-06 Denki Kagaku Kogyo Kk 熱分解窒化ホウ素物品およびその製造方法
JPS61268442A (ja) * 1985-05-23 1986-11-27 信越化学工業株式会社 多層構造の耐熱容器
GB2192643A (en) * 1986-07-14 1988-01-20 Universal High Technologies Method of coating refractory vessels with boron nitride
DE3915116C1 (en) * 1989-05-09 1990-11-15 Sintec Keramik Gmbh, 8959 Buching, De Electrically non-conducting crucible - includes pyrolytic carbon layer and aluminium nitride or aluminium oxide-contg. ceramic

Also Published As

Publication number Publication date
EP0477511A1 (de) 1992-04-01
DE4030540C1 (enrdf_load_stackoverflow) 1991-11-28

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