CA2033759A1 - Method of applying a thermal insulation layer to an immersion nozzle and immersion nozzle - Google Patents
Method of applying a thermal insulation layer to an immersion nozzle and immersion nozzleInfo
- Publication number
- CA2033759A1 CA2033759A1 CA002033759A CA2033759A CA2033759A1 CA 2033759 A1 CA2033759 A1 CA 2033759A1 CA 002033759 A CA002033759 A CA 002033759A CA 2033759 A CA2033759 A CA 2033759A CA 2033759 A1 CA2033759 A1 CA 2033759A1
- Authority
- CA
- Canada
- Prior art keywords
- immersion nozzle
- thermal insulation
- insulation layer
- fibre composition
- ceramic
- 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.)
- Abandoned
Links
- 238000007654 immersion Methods 0.000 title claims abstract description 76
- 238000009413 insulation Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 36
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 239000000919 ceramic Substances 0.000 claims abstract description 17
- 239000007767 bonding agent Substances 0.000 claims abstract description 9
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 6
- 238000007598 dipping method Methods 0.000 claims description 2
- 239000011214 refractory ceramic Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 20
- 238000005507 spraying Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Products (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Inorganic Fibers (AREA)
- Thermal Insulation (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
Method of Applying a Thermal Insulation Layer to an Immersion Nozzle and Immersion Nozzle ABSTRACT
The method of applying a thermal insulation layer of ceramic fibres to an immersion nozzle of refractory ceramic material is to be simply effectable. For this purpose a ceramic fibre composition of highly viscous consistency and containing an organic bonding agent is applied to the immersion nozzle. The fibre composition is subsequently dried on the immersion nozzle.
The method of applying a thermal insulation layer of ceramic fibres to an immersion nozzle of refractory ceramic material is to be simply effectable. For this purpose a ceramic fibre composition of highly viscous consistency and containing an organic bonding agent is applied to the immersion nozzle. The fibre composition is subsequently dried on the immersion nozzle.
Description
3 21[)337~
Method of Applying a Thermal Insulation Layer ,;
to an Immersion Nozzle and Immerslon Nozzle ~
DESCRIPTION ; ,~ , The invention relates to a method of applying a thermal insulation layer of ceramic fibres to an~immersion -" ,' nozzle of refractory, ceramic material. The invention also relates to such an immersion nozzle. ~ ;
Liquid metal melt is guided out of a melt vessel into a further melt vessel through an immersion nozzIe. At ,~
the beginning of pouring a considerable temperature shock occurs in the immersion nozzle which ;can result in the liquid metal melt freezing and the~ immersion nozzle being damaged. In order to avoid this it is '~
known to heat the immersion nozzle beore the start of pouring. This can occur, for instance, in a~furnace at ` ~,, about 1200C or by means of a gas burner. In the time ~
which necessarily elapses between the pre-heating of ~ ; ,, the immersion nozzle ~and the beginning of pouring~the immersion nozzle cools~down,again so that the~;mel~t~c~an;~
freeze in~the~ immersion nozzle~and~ the~ refractory~
material of~the~immersion nozzle 15 sub~ected~to; a~
temperature shock. ,In order to mai~ntain the temperature to which the immersion nozzle is pre-heated~
for as long as;possible and as high~as possible,~it i9:`~
known to secure~ a thermal insulating cer~am~lc fibre~
paper to the immersion nozzle. ; ~, Securing pre-fabricated ceramic fibre paper ~o ~the immersion nozzle is;~expensive. The ceramic,~fibre~paper~
must be cut to~size in accordance with the shape~of~the~
4 2~337 immersion nozzle. The more complicated the shape of the immersion nozzle the more expensive this becomes.
Immersion nozzles have, for instance, oval shapes, openings, undercuts and a differing diameter over their length. After the cutting to size the ceramic fibre paper must be adhered to the immersion nozzle by means of a special adhesive. This all makes the immersion nozzle more expensive.
:
An immersion nozzle is described in DE 3805334 A1 which is provided with an inner coating of fibre or foam ceramic material as a protection for the start of pouring. Such an inner coating cannot prevent the cooling down of the immersion nozzle between the pre-heating and the beginning of pouring since the immersion nozzle can radiate heat outwardly.
A method of producing paste-like ceramic fibre compositions is described in DE 3225161 C2.
It is the object of the invention to propose a method of the type referred to above which simplifies the application of the thermal insulatlon layer to the immersion nozzle. It is also the object of the invention to proposé an immersion nozzle on which the thermal insulation layer may simply be produced and the service life of the thermal insulation layer is also increased.
In accordance with the invention the above ob~ect is solved if a ceramic fibre composition of highly viscous consistency containing an organic bonding agent is applied to the immersion nozzle and if the fibre ~ `
'; ~':
. . ` :, - ' ' ':
~, , : ~ .
., ~,. . .. . . . . . ..
~33~7S~ :
composition on the immersion nozzle is subsequently dried. In this manner the thermal insulation layer may be applied to the immersion nozzle with the expense of little time and work, even if it is of geometrically complicated shape, that is to say has, for instance, an oval shape or openings and undercuts. Ceramic fibre paper does not need to be cut to size and nor does adhesive need to be applied.
Surprisingly, it has been found that the bonding agent of the fibre composition results at the same time also in a very good firm bonding of the dried fibre composition to th~ immersion nozzle.
~, Due to the higher bonding strength of the dried composition an exact positioning, for instance, when automatically, mechanically replacing the immersion nozzle is ensured.
In a preferred embodiment of the invention~the fibre composition is sprayed onto the immersion nozzle. The fibre composition may however also be~applied to ~the~
immersion nozzle by dipping it into a bath containing~
the ~flbre ~composltion.
An immersion nozzle in accordance with the invention of refractory, ceramic material with a thermal insulation layer of bonding agent and ceramic ~fibres ~is ;;~-characterised in that the bonding agent, which bonds the ceramic fibres, also connects the thermal insulation layer to the immersion nozzle. The~thermal insulation layer abuts the immersion nozzle~uniformly~
closely and tightly. It forms a thermal insulation for .
. ~ . .. . .. : ::
,: -.:. . . .
~:~. ; ' :, :: : . , . : .
:': ~ : : :
6 ~33759 the immersion nozzle so that it only cools down slowly after being heated up. At the same time, ~he thermal insulation layer also forms a protective layer against oxidation of the surface of the immersion nozzle. In connection with e.g. tundish replacement with relatively long residence times (5-15 min.) a further advantage is seen in that the thermal insulation layer survives many usages.
Further advantageous features of the invention will be apparent from the dependent claims and the following description. The Figure is a schematic sectional view of an immersion nozzle.
The composition of an immersion nozzle (1i is based e.g. on alumina or zirconium oxide (ZrO2) or magnesite (MgO~ and the remainder comprises carbonO Such a material is known commercially under the brand designation Grasanit, Grazettral or Gramagal of the applicants. A fibre composition as is described in DE 3225161 C2 and is known under the trade name 'iPyrostop ~Coating" is used as the ceramic ;;fibre composition. Such a fibre composition contains,~ for instance, 100 parts by weight ceramic fibres~, 110 parts by weight bentonite as bonding clay and~5 parts by weight starch as organic bonding agent and~also water and optionally colloidal SiO2. Depending on the application of the immersion nozzle and on the requirements placed on the fibre composition, fibre qualities with differing chemistry and differing classification temperatures can be used. The fibre composition is sprayed with a spraying device onto the exterior of the immersion nozzle (1). A plurality, for :
: ~
_ . .
. : .. . . ~ . . ...... . . : . . ;
.: . : : . .. , . , ~ . . . ~: : .
-.:. . ..... .. ,. . ~ .~. : . :
X033~5~ ::
instance four, layers are sprayed on top of one another. The multi-layer spraying is favourable for the thermal insulation properties since continuous ~`
thermal bridges ormed by the fibres are substantially avoided.
The sprayed on fibre composition is subsequently dried at about 110C to 140C. ~hereafter it is firmly connected to the immersion nozzle (1~ and thus has considerable advantages during transport of the immersion nozzle and when it is pre-heated. It has been found that the thermal insulation layer ~2) even adheres firmly to the immersion nozzle (1) if the outer surface (3) of the immersion nozzle (1) is glazed in order to avoid oxidation. The thermal insulation layer -(2) for its part forms an additional protection against oxidation of the immersion nozzle ~1) during pouring operation.
A simple shape of the outer sur~ace ~3) of the immersion nozzle (1) is shown in the Figure. The~~ `
desired~ thermal insulation layer is also~produced without difficulty if the immersion nozzle~ is~of~
complex geometrical shape, such as in the casé~of thin slab immersion nozzles.
In the exemplary embodiment shown in the Figure the thermal insulation layer (2) is provided only on the outer sur~ace ~3) of the immersion nozzle ~1). It is however also possible to provide the thermal insulation layer t2) also on the inner surface (4) of the~
immersion nozzle ~1). For this purpose~the~ fibre~
composition is sprayed onto the inner surface ~4). ~Due , :~:
,: ~
. .
. .: . ~ -.: . ~ . ., .. , .
.: ~ . .. ., .,, ; : . . . :
, : . , ~, :
:
. : .- - .
, ~:
2C)3375~ ~ :
to its low thermal conductivity and low thermal capacity it forms there an additional protection for the start of pouring which inhibits freezing of the melt.
The thickness of the thermal insulation layer (2) is, for instance, at least 1mm. It can be up to 4mm.
In a further exemplary embodiment of the invention the immersion nozzle (2) is dipped into a bath containing the fibre composition and subsequently lifted out of the bath and dried. The fibre composition sticks to the immersion nozzle (1~ and forms the ~hermal insulation layer (2). If the inner surface (4) of the immersion nozzle (1) is to remain free of fibre composition during the immersion, then the openings are closed by plugs.
. :
A comparison of the cooling rates between two externally thermally insulat~d immersion nozzles ~(in this case of the so-called Type WO 60), in one case , with the fibre spraying composition (A) in accordance with the invention, 2mm thick, on the other hand~with ~ -~
fibre paper (B), 2mm thick, illustrates the~advantages of thP fibre spraying composition.
Both immersion nozzles were heated up to a starting temperature of 700C and then the temperature-was determined after predetermined cooling times.
~, :
:
-, , ~ '' ~337~
~A) (B) .
Starting temperature700C 700C :
Temperature after 30 mins. 460C 400C ~:
60 mins. 320C 260C
120 mins. 170C 110C
180 mins, 115C 65C.
~, , ~ ~ :
' :' : ' , .
' :
, ' ` ~
,, _ . .
,. r: ~ . ~ ' . .
'' ' " ` ' ' , ' ~ ' "' ~ ~, ,
Method of Applying a Thermal Insulation Layer ,;
to an Immersion Nozzle and Immerslon Nozzle ~
DESCRIPTION ; ,~ , The invention relates to a method of applying a thermal insulation layer of ceramic fibres to an~immersion -" ,' nozzle of refractory, ceramic material. The invention also relates to such an immersion nozzle. ~ ;
Liquid metal melt is guided out of a melt vessel into a further melt vessel through an immersion nozzIe. At ,~
the beginning of pouring a considerable temperature shock occurs in the immersion nozzle which ;can result in the liquid metal melt freezing and the~ immersion nozzle being damaged. In order to avoid this it is '~
known to heat the immersion nozzle beore the start of pouring. This can occur, for instance, in a~furnace at ` ~,, about 1200C or by means of a gas burner. In the time ~
which necessarily elapses between the pre-heating of ~ ; ,, the immersion nozzle ~and the beginning of pouring~the immersion nozzle cools~down,again so that the~;mel~t~c~an;~
freeze in~the~ immersion nozzle~and~ the~ refractory~
material of~the~immersion nozzle 15 sub~ected~to; a~
temperature shock. ,In order to mai~ntain the temperature to which the immersion nozzle is pre-heated~
for as long as;possible and as high~as possible,~it i9:`~
known to secure~ a thermal insulating cer~am~lc fibre~
paper to the immersion nozzle. ; ~, Securing pre-fabricated ceramic fibre paper ~o ~the immersion nozzle is;~expensive. The ceramic,~fibre~paper~
must be cut to~size in accordance with the shape~of~the~
4 2~337 immersion nozzle. The more complicated the shape of the immersion nozzle the more expensive this becomes.
Immersion nozzles have, for instance, oval shapes, openings, undercuts and a differing diameter over their length. After the cutting to size the ceramic fibre paper must be adhered to the immersion nozzle by means of a special adhesive. This all makes the immersion nozzle more expensive.
:
An immersion nozzle is described in DE 3805334 A1 which is provided with an inner coating of fibre or foam ceramic material as a protection for the start of pouring. Such an inner coating cannot prevent the cooling down of the immersion nozzle between the pre-heating and the beginning of pouring since the immersion nozzle can radiate heat outwardly.
A method of producing paste-like ceramic fibre compositions is described in DE 3225161 C2.
It is the object of the invention to propose a method of the type referred to above which simplifies the application of the thermal insulatlon layer to the immersion nozzle. It is also the object of the invention to proposé an immersion nozzle on which the thermal insulation layer may simply be produced and the service life of the thermal insulation layer is also increased.
In accordance with the invention the above ob~ect is solved if a ceramic fibre composition of highly viscous consistency containing an organic bonding agent is applied to the immersion nozzle and if the fibre ~ `
'; ~':
. . ` :, - ' ' ':
~, , : ~ .
., ~,. . .. . . . . . ..
~33~7S~ :
composition on the immersion nozzle is subsequently dried. In this manner the thermal insulation layer may be applied to the immersion nozzle with the expense of little time and work, even if it is of geometrically complicated shape, that is to say has, for instance, an oval shape or openings and undercuts. Ceramic fibre paper does not need to be cut to size and nor does adhesive need to be applied.
Surprisingly, it has been found that the bonding agent of the fibre composition results at the same time also in a very good firm bonding of the dried fibre composition to th~ immersion nozzle.
~, Due to the higher bonding strength of the dried composition an exact positioning, for instance, when automatically, mechanically replacing the immersion nozzle is ensured.
In a preferred embodiment of the invention~the fibre composition is sprayed onto the immersion nozzle. The fibre composition may however also be~applied to ~the~
immersion nozzle by dipping it into a bath containing~
the ~flbre ~composltion.
An immersion nozzle in accordance with the invention of refractory, ceramic material with a thermal insulation layer of bonding agent and ceramic ~fibres ~is ;;~-characterised in that the bonding agent, which bonds the ceramic fibres, also connects the thermal insulation layer to the immersion nozzle. The~thermal insulation layer abuts the immersion nozzle~uniformly~
closely and tightly. It forms a thermal insulation for .
. ~ . .. . .. : ::
,: -.:. . . .
~:~. ; ' :, :: : . , . : .
:': ~ : : :
6 ~33759 the immersion nozzle so that it only cools down slowly after being heated up. At the same time, ~he thermal insulation layer also forms a protective layer against oxidation of the surface of the immersion nozzle. In connection with e.g. tundish replacement with relatively long residence times (5-15 min.) a further advantage is seen in that the thermal insulation layer survives many usages.
Further advantageous features of the invention will be apparent from the dependent claims and the following description. The Figure is a schematic sectional view of an immersion nozzle.
The composition of an immersion nozzle (1i is based e.g. on alumina or zirconium oxide (ZrO2) or magnesite (MgO~ and the remainder comprises carbonO Such a material is known commercially under the brand designation Grasanit, Grazettral or Gramagal of the applicants. A fibre composition as is described in DE 3225161 C2 and is known under the trade name 'iPyrostop ~Coating" is used as the ceramic ;;fibre composition. Such a fibre composition contains,~ for instance, 100 parts by weight ceramic fibres~, 110 parts by weight bentonite as bonding clay and~5 parts by weight starch as organic bonding agent and~also water and optionally colloidal SiO2. Depending on the application of the immersion nozzle and on the requirements placed on the fibre composition, fibre qualities with differing chemistry and differing classification temperatures can be used. The fibre composition is sprayed with a spraying device onto the exterior of the immersion nozzle (1). A plurality, for :
: ~
_ . .
. : .. . . ~ . . ...... . . : . . ;
.: . : : . .. , . , ~ . . . ~: : .
-.:. . ..... .. ,. . ~ .~. : . :
X033~5~ ::
instance four, layers are sprayed on top of one another. The multi-layer spraying is favourable for the thermal insulation properties since continuous ~`
thermal bridges ormed by the fibres are substantially avoided.
The sprayed on fibre composition is subsequently dried at about 110C to 140C. ~hereafter it is firmly connected to the immersion nozzle (1~ and thus has considerable advantages during transport of the immersion nozzle and when it is pre-heated. It has been found that the thermal insulation layer ~2) even adheres firmly to the immersion nozzle (1) if the outer surface (3) of the immersion nozzle (1) is glazed in order to avoid oxidation. The thermal insulation layer -(2) for its part forms an additional protection against oxidation of the immersion nozzle ~1) during pouring operation.
A simple shape of the outer sur~ace ~3) of the immersion nozzle (1) is shown in the Figure. The~~ `
desired~ thermal insulation layer is also~produced without difficulty if the immersion nozzle~ is~of~
complex geometrical shape, such as in the casé~of thin slab immersion nozzles.
In the exemplary embodiment shown in the Figure the thermal insulation layer (2) is provided only on the outer sur~ace ~3) of the immersion nozzle ~1). It is however also possible to provide the thermal insulation layer t2) also on the inner surface (4) of the~
immersion nozzle ~1). For this purpose~the~ fibre~
composition is sprayed onto the inner surface ~4). ~Due , :~:
,: ~
. .
. .: . ~ -.: . ~ . ., .. , .
.: ~ . .. ., .,, ; : . . . :
, : . , ~, :
:
. : .- - .
, ~:
2C)3375~ ~ :
to its low thermal conductivity and low thermal capacity it forms there an additional protection for the start of pouring which inhibits freezing of the melt.
The thickness of the thermal insulation layer (2) is, for instance, at least 1mm. It can be up to 4mm.
In a further exemplary embodiment of the invention the immersion nozzle (2) is dipped into a bath containing the fibre composition and subsequently lifted out of the bath and dried. The fibre composition sticks to the immersion nozzle (1~ and forms the ~hermal insulation layer (2). If the inner surface (4) of the immersion nozzle (1) is to remain free of fibre composition during the immersion, then the openings are closed by plugs.
. :
A comparison of the cooling rates between two externally thermally insulat~d immersion nozzles ~(in this case of the so-called Type WO 60), in one case , with the fibre spraying composition (A) in accordance with the invention, 2mm thick, on the other hand~with ~ -~
fibre paper (B), 2mm thick, illustrates the~advantages of thP fibre spraying composition.
Both immersion nozzles were heated up to a starting temperature of 700C and then the temperature-was determined after predetermined cooling times.
~, :
:
-, , ~ '' ~337~
~A) (B) .
Starting temperature700C 700C :
Temperature after 30 mins. 460C 400C ~:
60 mins. 320C 260C
120 mins. 170C 110C
180 mins, 115C 65C.
~, , ~ ~ :
' :' : ' , .
' :
, ' ` ~
,, _ . .
,. r: ~ . ~ ' . .
'' ' " ` ' ' , ' ~ ' "' ~ ~, ,
Claims (9)
1. Method of applying a thermal insulation layer of ceramic fibres to an immersion nozzle of refractory, ceramic material, characterised in that a ceramic fibre composition of highly viscous consistency containing an organic bonding agent is applied to the immersion nozzle (1) and that the fibre composition on the immersion nozzle (1) is subsequently dried.
2. Method as claimed in claim 1, characterised in that the fibre composition is sprayed onto the immersion nozzle (1).
3. Method as claimed in claim 2, characterised in that the fibre composition is sprayed onto the immersion nozzle in a plurality of layers.
4. Method as claimed in claim 1, characterised in that the immersion nozzle (1) is dipped into a bath containing the fibre composition.
5. Method as claimed in claim 4, characterised in that openings in the immersion nozzle (1) are closed before the dipping into the fibre composition.
6. Method as claimed in one of the preceding claims 1 to 4, characterised in that the fibre composition is applied to the inner surface (4) of the immersion nozzle (1).
7. Immersion nozzle of refractory, ceramic material with a thermal insulation layer of ceramic fibres and bonding agent, characterised in that the bonding agent, which bonds the ceramic fibres, also connects the thermal insulation layer (2) to the immersion nozzle (1).
8. Immersion nozzle as claimed in claim 7, characterised in that the thickness of the thermal insulation layer (2) is about 1mm to 4mm.
9. Immersion nozzle as claimed in claim 7 or 8, characterised in that the thermal insulation layer (2) is also provided on the inner surface (4) of the immersion nozzle (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4000276.4 | 1990-01-08 | ||
| DE4000276 | 1990-01-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2033759A1 true CA2033759A1 (en) | 1991-07-09 |
Family
ID=6397697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002033759A Abandoned CA2033759A1 (en) | 1990-01-08 | 1991-01-08 | Method of applying a thermal insulation layer to an immersion nozzle and immersion nozzle |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0438652A1 (en) |
| JP (1) | JPH04210866A (en) |
| KR (1) | KR910014164A (en) |
| BR (1) | BR9100032A (en) |
| CA (1) | CA2033759A1 (en) |
| ZA (1) | ZA909237B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102171699B1 (en) * | 2018-11-05 | 2020-10-29 | 한국세라믹기술원 | Method for manufacturing 3d shaped ceramic using 3d printing and electron beam curing |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2085544A1 (en) * | 1970-04-30 | 1971-12-24 | Produits Refractaires | Nozzle tip - for teeming liquid metal at high temp |
| FR2364082A1 (en) * | 1976-09-10 | 1978-04-07 | Sepr | Casting pipe contg. a tube impermeable to gas - and used in the low pressure casting of metals and alloys |
| DE2646707C3 (en) * | 1976-10-13 | 1984-01-26 | Mannesmann AG, 4000 Düsseldorf | Immersion nozzle made of refractory material for the continuous casting of steel |
| BE851026A (en) * | 1977-02-02 | 1977-05-31 | Centre Rech Metallurgique | PROCESS FOR IMPROVING THE QUALITY OF CONTINUOUS METAL CASTING BUSETS AND BUSETTE OBTAINED BY MEANS OF THIS PROCEDURE |
| FR2617157B1 (en) * | 1987-06-26 | 1991-01-11 | Vesuvius Crucible Co | INSULATING COATING FOR REFRACTORY BODIES, COATING METHOD AND ARTICLE THEREOF |
| GB8722442D0 (en) * | 1987-09-24 | 1987-10-28 | Foseco Int | Pouring tubes |
| DE3805334A1 (en) * | 1988-02-20 | 1989-08-31 | Didier Werke Ag | Refractory wearing part for the nozzle on metallurgical vessels and a protective sleeve for initial casting with a wearing part of this kind |
-
1990
- 1990-11-14 EP EP90121764A patent/EP0438652A1/en not_active Withdrawn
- 1990-11-16 ZA ZA909237A patent/ZA909237B/en unknown
- 1990-12-22 KR KR1019900021416A patent/KR910014164A/en not_active Application Discontinuation
- 1990-12-27 JP JP2418306A patent/JPH04210866A/en active Pending
-
1991
- 1991-01-07 BR BR919100032A patent/BR9100032A/en unknown
- 1991-01-08 CA CA002033759A patent/CA2033759A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| BR9100032A (en) | 1991-10-22 |
| EP0438652A1 (en) | 1991-07-31 |
| JPH04210866A (en) | 1992-07-31 |
| ZA909237B (en) | 1991-09-25 |
| KR910014164A (en) | 1991-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6051058A (en) | Protective coating comprising boron nitride for refractory material members of an ingot mold for continuous casting of metals | |
| EP0371098B1 (en) | Clad precious metal bushing | |
| AU7705194A (en) | Coating compositions for articles of graphite-alumina refractory material | |
| US6559082B1 (en) | Insulating refractory material | |
| CN113549862B (en) | High-energy laser protection multilayer composite material coating structure and manufacturing method thereof | |
| KR100647858B1 (en) | Binding structure of refractory sleeve for inner hole of nozzle for continuous casting | |
| US7090918B2 (en) | Externally glazed article | |
| JPH0585853A (en) | Monolithic refractory material, process for producing same and refractory material product formed therefrom | |
| CA2033759A1 (en) | Method of applying a thermal insulation layer to an immersion nozzle and immersion nozzle | |
| JP2017122531A (en) | Heat insulation structure of refractory | |
| US6479175B1 (en) | Ceramic composite | |
| JPH04225785A (en) | Method of coating dipping tap hole with heat-insulating layer and dipping tap hole | |
| EP1492639B1 (en) | Thermal shock resistant casting element and manufacturing process thereof | |
| JP6372539B2 (en) | Thermal insulation coating material for continuous casting nozzle | |
| JPS6224178B2 (en) | ||
| JPS63160761A (en) | Nozzle for continuous casting | |
| JP3242169U (en) | Refractory adhesion prevention structure | |
| WO2022163293A1 (en) | Fusion prevention structure for refractory material | |
| JPH09301782A (en) | Ceramic fiber formed article excellent in molten nonferrous metal resistance and its manufacture | |
| Morikawa et al. | Fibre-Free Sprayable Foaming Insulation Coat for Continuous Casting Nozzles | |
| JP2017194191A (en) | Heat insulation structure for refractory item | |
| JP3739566B2 (en) | Tundish stopper for continuous casting | |
| JPH10263764A (en) | Nozzle for continuous casting | |
| KR100704854B1 (en) | Long nozzle for mold molden steel casting made heat insulation coating layer | |
| JP2004277779A (en) | Method for bonding thermal-sprayed layer to steel member |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |