EP0386555A1 - Revêtement d'isolation pour une installation de chauffage à haute température et utilisation de celui-ci - Google Patents

Revêtement d'isolation pour une installation de chauffage à haute température et utilisation de celui-ci Download PDF

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Publication number
EP0386555A1
EP0386555A1 EP90103613A EP90103613A EP0386555A1 EP 0386555 A1 EP0386555 A1 EP 0386555A1 EP 90103613 A EP90103613 A EP 90103613A EP 90103613 A EP90103613 A EP 90103613A EP 0386555 A1 EP0386555 A1 EP 0386555A1
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EP
European Patent Office
Prior art keywords
stiffening elements
insulation
monocrystalline
temperature
consist
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.)
Withdrawn
Application number
EP90103613A
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German (de)
English (en)
Inventor
Horst Dipl.-Ing. Linn
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.)
Linn High Therm GmbH
Original Assignee
Linn High Therm GmbH
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 Linn High Therm GmbH filed Critical Linn High Therm GmbH
Publication of EP0386555A1 publication Critical patent/EP0386555A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • F27D1/06—Composite bricks or blocks, e.g. panels, modules
    • F27D1/08—Bricks or blocks with internal reinforcement or metal backing

Definitions

  • the invention relates to insulation for a high-temperature heating device, rod-shaped stiffening elements made of a ceramic material being provided for the insulating material to prevent bulges caused by temperature, and the use of this insulation.
  • a plate-shaped fiber material is used as the insulating material, the composition of which, for example, is based on aluminum silicate, aluminum oxide, zirconium oxide or the like. is based, and which has a density in the range between 50 kg / m3 and 600 kg / m3.
  • This fiber material can be mixed with suitable powders.
  • microporous insulating materials can also be used or insulating materials with hollow spherical particles can be used as the insulating material, insulating materials made from the last-mentioned substances having a density which corresponds to the above-mentioned density.
  • rods made of sintered aluminum oxide have been used as stiffening elements. These rods can have a full cross section or a hollow cross section.
  • Rod-shaped stiffening elements made of sintered aluminum oxide are relatively inexpensive, but they can only be used in the long term up to approx. 1600 ° C or briefly up to a maximum of approx. 1700 ° C. At temperatures above 1700 ° C, such as in furnaces for sintering oxides, nitrides, borides, carbides or the like.
  • stiffening elements made of sintered ceramic Because of the aforementioned problems when using stiffening elements made of sintered ceramic, it has previously been forced to use the stiffening elements in the insulation of a furnace or the like. to be arranged so that their temperature does not rise above the specified limit. This means certain limitations in furnace design. The same also applies to the use of metal stiffening rods, such as those mentioned in US Pat. Nos. 4,157,001, 4,429,504 and 4,381,634. Such stiffening elements can also be used only up to certain upper temperature limits, so that even when using metal stiffening elements there are limits to both the operating temperature and the design of the stoves.
  • a refractory component made of ceramic fibers which has an inner reinforcing element which can be made from a heat-resistant metal alloy, from refractory clay or from aluminum oxide.
  • this reinforcing element is not rod-shaped but channel-shaped and is embedded in the fiber insulating material, it being possible for the stiffening element to be anchored in that the stiffening element should have a mesh shape.
  • This known stiffening element also does not have the strength required in general.
  • the production and embedding of the known stiffening element is very complicated.
  • a metallic anchor for holding insulation is known, which is to be encased by a sleeve made of ceramic material.
  • the insulation can consist of a ceramic fiber material.
  • Conventional polycrystalline ceramic materials are used for the anchor sleeves, so that the problems described can be expected from sintered ceramics.
  • the invention has for its object to provide insulation of the type mentioned, which can be used up to operating temperatures of the order of 1900 ° C, without causing undesirable bending or bulging of the insulation or the stiffening elements, and also the possibility should be given to be able to design and construct the heating device largely freely.
  • stiffening elements consist of a monocrystalline ceramic material.
  • the stiffening elements made of monocrystalline material have compared to known stiffening elements made of sintered, i.e. polycrystalline material, in particular sintered aluminum oxide, has the advantage of being very temperature-resistant and up to very high temperatures in the order of magnitude around 1900 ° C. being very temperature-resistant and dimensionally stable. Insulations equipped with such stiffening elements are required for high-temperature heating devices such as Sintering furnaces can be used, the operating temperature of which can be up to 1900 ° C and more, without causing undesirable bending of the stiffening elements. Thus, the insulation stiffened by the stiffening elements is secured against unwanted bulges.
  • stiffening elements can also be arranged at locations at which comparatively high temperatures prevail, so that it is entirely possible in a procedure according to the invention to provide completely new furnace designs, in particular. Install insulation where the stiffening elements are exposed to high temperatures.
  • monocrystalline ceramic material is by no means to be seen as obvious, even if it was known that this material can withstand high temperatures. Until now, monocrystalline ceramic material has only been used because of its special optical properties and resistance to aggressive media, even at high temperatures. A use for mechanically stressed elements, which are stiffening elements, has not previously been described in Considered because monocrystalline ceramic material is extremely sensitive to mechanical stress.
  • a refractory material is known from DE-AS 24 61 801, in which single crystals are contained in a matrix in comminuted form. There, however, the single crystals are not particularly mechanically stressed, so that the known use of monocrystalline ceramic material cannot be compared with the use of corresponding material for mechanically stressed stiffening elements.
  • the stiffening elements suitably consist of a monocrystalline oxide ceramic material.
  • This oxide ceramic material is preferably monocrystalline aluminum oxide, i.e. around sapphire.
  • the stiffening elements it would also be possible for the stiffening elements to consist of a monocrystalline, non-oxide ceramic material, which can be a monocrystalline boride, nitride and / or carbide material.
  • the stiffening elements made of monocrystalline material can be provided next to the insulating material and rest against it. Another possibility is that the stiffening elements are provided in recesses in the insulating material. Regardless of whether the stiffening elements lie against the outside of the insulating material or are arranged in recesses in the insulating material provided for this purpose, the stiffening elements made of monocrystalline ceramic material have the advantage that the insulation formed in this way can withstand temperatures up to 1900 ° C. and more against unwanted ones Bulges is stable, even if these high temperatures act on the insulation for a long time. In endurance tests it was determined that such a Insulation Withstands temperatures on the order of 1900 ° C for weeks without the insulation bulging.
  • the stiffening elements can be designed with a full cross section or with a hollow cross section.
  • the insulation according to the invention can be used in conjunction with any heating or radiation source.
  • This heating or radiation source can be an electrical heating element, microwave heating, a burner, or any other infrared radiation source.
  • the insulation according to the invention has the advantage that the power connection value can be reduced to about half to a quarter of the power connection value of an infrared radiation source isolated by means of dense refractory material when using the insulation according to the invention (energy saving).
  • a preferred use of the insulation according to the invention is given in high-temperature furnaces for operating temperatures around 1900 ° C.
  • Such high-temperature furnaces are required, for example, for sintering oxide ceramics, silicon nitride or boron nitride structural parts which are used, for example, in electronics, the component industry, medical technology, rocket technology, engine development or other engineering ceramics and the like. are used.
  • Figures 1 and 2 show an insulating material 10, which is preferably a plate-shaped fiber material.
  • a fiber material for example made of aluminum silicate, aluminum oxide, zirconium oxide or the like, which can optionally be mixed with a powder
  • a microporous insulating material or an insulating material containing hollow spherical particles can also be used.
  • the density of the insulating material is between 50 kg / m3 and 600 kg / m3, preferably between 80 kg / m3 and 500 kg / m3.
  • stiffening elements 14 rest against the surface 12 of the insulating material 10, of which only one stiffening element 14 is visible in FIG. 1. It can be seen from FIG. 2 that the stiffening elements 14 are closely spaced from one another on the surface 12 of the insulating material 10.
  • the stiffening elements 14 are rod-shaped here with a round full cross section.
  • FIG. 6 shows e.g. a section of a stiffening element 14, which is strip or band-shaped and is provided with through holes 16.
  • FIGS. 3 and 4 show an embodiment of the insulation drawn in sections from a plate-shaped insulating material 10, which is a fiber material, a microporous insulating material, an insulating material or the like which has hollow spherical particles. acts, and which is provided with through recesses 18 which extend in a central portion spaced apart through the insulating material 10.
  • a stiffening element 14 is arranged in each passage recess 18, the cross-sectional dimensions of which are adapted to the clear internal dimensions of the passage recesses 18.
  • the stiffening elements 14 consist of a monocrystalline oxide ceramic or non-oxide ceramic material. Due to the monocrystalline ceramic material of the stiffening elements 14, they are dimensionally stable up to temperatures of the order of 1900 ° C. and more, so that undesired curvature of the insulation is avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Resistance Heating (AREA)
  • Thermal Insulation (AREA)
EP90103613A 1989-03-04 1990-02-24 Revêtement d'isolation pour une installation de chauffage à haute température et utilisation de celui-ci Withdrawn EP0386555A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3906986 1989-03-04
DE19893906986 DE3906986C1 (fr) 1989-03-04 1989-03-04

Publications (1)

Publication Number Publication Date
EP0386555A1 true EP0386555A1 (fr) 1990-09-12

Family

ID=6375541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103613A Withdrawn EP0386555A1 (fr) 1989-03-04 1990-02-24 Revêtement d'isolation pour une installation de chauffage à haute température et utilisation de celui-ci

Country Status (3)

Country Link
EP (1) EP0386555A1 (fr)
DE (1) DE3906986C1 (fr)
PT (1) PT93323A (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1127271B (de) * 1958-08-30 1962-04-05 Ialicenciaia Talalmanyokat Ert Feuerfester Verbundstein und Verfahren zum Herstellen desselben
FR2375476A1 (fr) * 1976-12-27 1978-07-21 Carborundum Co Flasque de serrage en ceramique refractaire
FR2529541A1 (fr) * 1982-06-30 1984-01-06 Didier Werke Ag Element de construction composite, constitue par au moins deux parties en des materiaux fibreux differents, son procede de fabrication et son utilisation
US4714072A (en) * 1986-07-18 1987-12-22 The Babcock & Wilcox Company Mechanically attached two component ceramic fiber system
EP0350647A1 (fr) * 1988-06-22 1990-01-17 Kanthal GmbH Elément de toit ou de mur autoportant et four industriel à hautes températures ainsi équipé

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2461801C3 (de) * 1974-12-30 1979-01-04 Fisitscheskij Institut Imeni P.N. Lebedeva Akademii Nauk Ssr Feuerfester Werkstoff
GB1568603A (en) * 1977-01-15 1980-06-04 Carborundum Co Ltd Furnace linings
AT392692B (de) * 1980-07-29 1991-05-27 Detrick M H Co Feuerfester, mit hohlraeumen versehener auskleidungsstein fuer industrieoefen
US4429504A (en) * 1981-03-20 1984-02-07 Manville Service Corporation Fiber blanket insulation module
US4381634A (en) * 1981-03-20 1983-05-03 Manville Service Corporation Fiber blanket insulation module
DE3228319C2 (de) * 1982-07-29 1985-02-07 Bulten-Kanthal GmbH, 6082 Mörfelden-Walldorf Haltevorrichtung für Matten oder Formteile aus keramischem Fasermaterial für einen Ofen
JPS61146797A (ja) * 1984-12-14 1986-07-04 Tateho Kagaku Kogyo Kk 窒化珪素ならびに炭化珪素の連続的製造方法
DE3803681C1 (fr) * 1988-02-06 1988-12-22 Roland Ing.(Grad.) 5828 Ennepetal De Abicht

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1127271B (de) * 1958-08-30 1962-04-05 Ialicenciaia Talalmanyokat Ert Feuerfester Verbundstein und Verfahren zum Herstellen desselben
FR2375476A1 (fr) * 1976-12-27 1978-07-21 Carborundum Co Flasque de serrage en ceramique refractaire
FR2529541A1 (fr) * 1982-06-30 1984-01-06 Didier Werke Ag Element de construction composite, constitue par au moins deux parties en des materiaux fibreux differents, son procede de fabrication et son utilisation
US4714072A (en) * 1986-07-18 1987-12-22 The Babcock & Wilcox Company Mechanically attached two component ceramic fiber system
EP0350647A1 (fr) * 1988-06-22 1990-01-17 Kanthal GmbH Elément de toit ou de mur autoportant et four industriel à hautes températures ainsi équipé

Also Published As

Publication number Publication date
DE3906986C1 (fr) 1990-07-19
PT93323A (pt) 1991-10-15

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