WO2001014279A1 - Corps moule en ceramique refractaire - Google Patents

Corps moule en ceramique refractaire Download PDF

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Publication number
WO2001014279A1
WO2001014279A1 PCT/EP2000/006834 EP0006834W WO0114279A1 WO 2001014279 A1 WO2001014279 A1 WO 2001014279A1 EP 0006834 W EP0006834 W EP 0006834W WO 0114279 A1 WO0114279 A1 WO 0114279A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaped body
body according
matrix material
refractory
offset
Prior art date
Application number
PCT/EP2000/006834
Other languages
German (de)
English (en)
Inventor
Roland Nilica
Original Assignee
Weitsch-Radex 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 Weitsch-Radex Gmbh filed Critical Weitsch-Radex Gmbh
Priority to AU65647/00A priority Critical patent/AU6564700A/en
Publication of WO2001014279A1 publication Critical patent/WO2001014279A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/013—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics containing carbon
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/053—Fine ceramics
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/111—Fine ceramics
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/44—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminates
    • C04B35/443—Magnesium aluminate spinel

Definitions

  • the invention relates to a refractory ceramic molded body.
  • the invention is directed to a refractory ceramic molded body having a high density and correspondingly low open porosity, which has a good thermal shock resistance and good Bruchzähig ⁇ ness.
  • the molded part should have good ductility in order to be able to use the products advantageously where mechanical and / or thermal stresses occur.
  • DE 44 03 869 C2 discloses a refractory ceramic mixture which, in addition to MgO sinter, contains a spinel of the Herzynite type as the refractory oxidic matrix material. When molded parts made from it fire, there is no complete, dense sintering, so that the molded body retains a certain "elasticity".
  • WO 84/00030 proposes a material based on Zr0 2 in different grain fractions.
  • One grain fraction has an average particle size of less than 4 ⁇ m, the other grain fraction has an average particle size between 4 and 25 ⁇ m.
  • EP 0 318 489 B1 proposes a refractory composite material with a porosity ⁇ 12%, which contains a matrix based on aluminum oxide and particles of zirconium dioxide dispersed in the matrix.
  • the porosity in the specified range is too high for numerous applications.
  • PCT / AU98 / 00793 describes a dense ceramic material consisting of a spinel matrix and a phase which forms microcracks, the latter being said to consist of zirconium dioxide.
  • the invention takes a completely different way of providing a refractory ceramic molded body which, in particular, has good resistance to temperature changes and good fracture toughness, and thus good ductility.
  • the basic idea of the invention is to produce the refractory ceramic molded body from a batch which, in addition to a finely divided refractory oxidic matrix material, contains a limited proportion of finely divided, platelet-shaped graphite.
  • the shaped body is fired redu ⁇ ornamental.
  • the special effect here is that the platelet-shaped graphite causes the formation of fine and evenly distributed defects in the "structure" of the fired stone.
  • the platelet-shaped graphite has the result that the sintered, finely divided matrix material is regularly interrupted by defects in angular geometry, the defects Even after the fire, they are completely or partially filled with the graphite flakes. At these edges, stress peaks and micro-cracks are initiated during loading (due to thermal or mechanical stresses). These stress peaks and micro-cracks dissipate energy and crack propagation inhibited or prevented.
  • the reducing sintering fire stimulates cation diffusion as a result of the increased formation of oxygen defect sites in the lattice.
  • the cation In the case of a refractory oxidic matrix material based on aluminum oxide or MA spinel, for example, diffusion is the rate-determining step during the sintering.
  • the defects mentioned are Wesent ⁇ Lich for nucleation, so that it is also favored.
  • ⁇ Lich for nucleation
  • a sufficient number of contact points between the primary particles of the matrix material is important for good sintering, which is why this should be used in a small grain size ⁇ 50 ⁇ m.
  • the most general embodiment of the invention then relates to a reductively fired, refractory ceramic molded body from a mixture which, in addition to a refractory oxidic matrix material with a grain size of ⁇ 50 ⁇ m, contains 1 to 7% by volume of platelet-shaped graphite with a size of ⁇ 50 ⁇ m.
  • the shaped body is adjusted so that it can have a total porosity ⁇ 5.0% by volume after firing, the total porosity according to embodiments being ⁇ 4.5% by volume or ⁇ 4% by volume.
  • the matrix material of the offset can be used in a grain size ⁇ 30 ⁇ m, according to a further embodiment ⁇ 20 ⁇ m.
  • the size of the graphite can also be reduced to values ⁇ 30 ⁇ m or ⁇ 10 ⁇ m. Due to the plate-like structure of the graphite, the “size” described describes the dimension along the main surfaces of the respective plate (D 50 value), the thickness of which is significantly smaller, for example ⁇ 10 ⁇ m or ⁇ 5 ⁇ m.
  • the fire which is typically carried out at about 1,600 up to 1,700 ° C should be conducted so that the matrix material is not reduced and a sintering ⁇ density of the molding adjusts> 95% of the pure substance density of the refractory matrix material, wherein the sintered ⁇ dense also Can be> 97%.
  • the refractory matrix material of offset can fundamentally ⁇ additionally consist of any materials, for example from one or more of the following components: MgO, A1 2 0 3, MgO-Al 2 0 3 (MA), MgO-Al 2 0 3 spinel (MA - spinel).
  • the molded parts can be burned, for example, in a coke bed.
  • the graphite can at least temporarily and locally (at the defects) protect the matrix component from the absorption of foreign oxides, since, for example, the oxides of iron, manganese, chromium or copper are reduced.
  • Another advantage of the shaped body according to the invention is its reduced wettability compared to slags and an excellent resistance to temperature changes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

L'invention concerne un corps moulé en céramique réfractaire, cuit de manière réductrice, qui comprend un mélange contenant outre une matière matricielle oxydique réfractaire dont la grosseur des grains est inférieure à 50 νm, entre 1 et 7 % en poids de graphite lamellaire dont la grosseur des grains est inférieure à 50 νm.
PCT/EP2000/006834 1999-08-19 2000-07-18 Corps moule en ceramique refractaire WO2001014279A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU65647/00A AU6564700A (en) 1999-08-19 2000-07-18 Fireproof ceramic shaped body

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999138817 DE19938817C2 (de) 1999-08-19 1999-08-19 Feuerfester keramischer Formkörper
DE19938817.2 1999-08-19

Publications (1)

Publication Number Publication Date
WO2001014279A1 true WO2001014279A1 (fr) 2001-03-01

Family

ID=7918566

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/006834 WO2001014279A1 (fr) 1999-08-19 2000-07-18 Corps moule en ceramique refractaire

Country Status (3)

Country Link
AU (1) AU6564700A (fr)
DE (1) DE19938817C2 (fr)
WO (1) WO2001014279A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62148076A (ja) * 1985-12-23 1987-07-02 Akechi Ceramics Kk 連続鋳造用ノズル
JPH0437452A (ja) * 1990-05-31 1992-02-07 Nippon Steel Corp 広幅薄肉スラブ鋳造用ノズル
GB2286184A (en) * 1994-02-08 1995-08-09 Veitsch Radex Ag Refractory ceramic mass comprising magnesia

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4130452A1 (de) * 1991-09-13 1993-03-18 Radex Heraklith Gebrannter feuerfester keramischer koerper

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62148076A (ja) * 1985-12-23 1987-07-02 Akechi Ceramics Kk 連続鋳造用ノズル
JPH0437452A (ja) * 1990-05-31 1992-02-07 Nippon Steel Corp 広幅薄肉スラブ鋳造用ノズル
GB2286184A (en) * 1994-02-08 1995-08-09 Veitsch Radex Ag Refractory ceramic mass comprising magnesia

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 377 (M - 649) 9 December 1987 (1987-12-09) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 212 (M - 1250) 19 May 1992 (1992-05-19) *

Also Published As

Publication number Publication date
DE19938817C2 (de) 2001-07-05
AU6564700A (en) 2001-03-19
DE19938817A1 (de) 2001-02-22

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