CA2278473A1 - Use of a wire mesh - Google Patents
Use of a wire mesh Download PDFInfo
- Publication number
- CA2278473A1 CA2278473A1 CA002278473A CA2278473A CA2278473A1 CA 2278473 A1 CA2278473 A1 CA 2278473A1 CA 002278473 A CA002278473 A CA 002278473A CA 2278473 A CA2278473 A CA 2278473A CA 2278473 A1 CA2278473 A1 CA 2278473A1
- Authority
- CA
- Canada
- Prior art keywords
- wire mesh
- gas purging
- channels
- gas
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
- B28B7/18—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes the holes passing completely through the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
- B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
- C04B38/065—Burnable, meltable, sublimable materials characterised by physical aspects, e.g. shape, size or porosity
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/48—Bottoms or tuyéres of converters
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0087—Uses not provided for elsewhere in C04B2111/00 for metallurgical applications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention relates to the use of a wire mesh coated with a material that can be burnt out for the production of gas flush elements, notably to form a porous network inside a ceramic matrix material after said coating material has burn out.
Description
Use of a Wire Mesh Specification The invention refers to the use of a wire mesh being coated by a material which can be burned out, and being fabricated as a self-supporting formed body.
Such a wire mesh, which, for instance, is plastic-coated, is known for constructing fences, for example.
By the present invention a totally different use of such a wire mesh is presented, that is for the production of ceramic gas purging elements and in this for forming a network of pores within a ceramic matrix material after burning out said coating material.
Several techniques are known for producing such refractory ceramic gas purging elements, mostly in the form of discrete gas purging plugs. Particularly, this concerns the formation of pores or channels through which a treating gas may be injected into the molten metal by the gas purging plug.
Basically, three different types of such gas purging elements are known, that ist:
1. gas purging plugs with undirected porosity 2. gas purging plugs with directed porosity 3. so-called gas purging plugs with slitlike channels.
The invention is directed to the second group.
It can be gathered from the DE 195 04 941 A1 that gas purging plugs are known, wherein the gas passage channels are formed with the aid of a three-dimensional network structure wich is produced within the monolithicly cast refractory workpiece with the aid of a tensioning device.
The production of that gas purging plug is described as relatively expensive.
Also, the same document refers to known purging plugs according to DE-OS 38 23 897, wherein threads or stripes are inserted into a casting mould, also with the aid of a tensioning device, which can be pulled out or burned out after the formed piece having set.
The technology describe above for forming channels of pores within refractory gas purging elements has been accepted, particularly for the following reasons: the channels (channels of pores) resulting after burning out the threads or strips mostly consisting of plastic may only have a relatively small cross section (diameter), a maximum cross section of 1 mm being envisaged in most cases. With larger cross sections the risk of infiltration of molten metal increases considerably. However, plastic threads or strips having such small cross sections have only an insufficient inherent stability so that they have to be arranged in said tensioning devices. Then, they are cast around mostly with a refractory casting material. After the refractory material is set the plastic inserts are burned out later in tempering necessary anyway in most cases and/or burning the gas purging element.
On the other hand, the invention provides a substantial technical improvement in that said tensioning devices may be omitted.
It sticks to the technology of channel formers which can be burned outs however, no threads or strips of plastic only but wire meshes being coated by a material which can be burned out are used, which have a considerable inherent stability corresponding to the stability of the metallic basic body and, accordingly, need no or no considerable additional anchorage.
If, for example, the wire mesh is fabricated having a cylindrical shape, it is simply placed on the bottom of a mould for a gas purging plug and subsequently cast around (cast over) with a refractory material. After setting and removing the mould the gas purging plug may be tempered and/or burned to eliminate the coating material which can be burned out so that annular channels result around the "wire ropes", along which the treating gas can be transported through the gas purging body.
It is evident that by selecting appropriate, mostly metallic materials with very small diameters (cross sections) a wire mesh having an appropriate inherent stability may be produced, which is sufficient to keep the formed body stable in shape while casting over the ceramic material. The coating material may be applied in a thin to very thin layer. It may consist of plastic but also of wax, paraffin or like materials which can be burned off.
Also with respect to the shape of the cross section of the individual wires, the idea of the invention is not subject to limitations. Wires having circular cross sections, angular cross sections or the like may be used.
Also, the geometry of the workpiece is almost arbitrary. So, in addition to the cylindrical shape mentioned above the wire mesh may have the shape of a cone or a truncated cone.
Cylinder-like shapes having angular cross sections are conceivable as well; but also formed bodies having a semi-circular cross section, an L-shaped or a U-shaped cross-section are part of the concept of a "formed body"
(workpiece)~ there is only the requirement that it is self-supporting, if it is placed upon a bottom, for example, and that also during the further production process for said ceramic gas purging plugs.
The coated wire meshes can be used not only for the production of cast gas purging plugs of course they can also be employed when the ceramic material is pressed.
With respect to the concrete geometry the term "wire mesh"
allows any embodiment. So, the wire mesh and thus the later structure of the channel system of pores may have a net-like shape. But also main wires (main channels) extending more or less coaxially to each other are conceivable as well, which are connected by individual transversal channels (transversal wires).
A coiled shape of individual wires, possibly on a basic body of wires, is conceivable as well.
Of course, several wire meshes of said type can be fabricated side by side or coaxially.
The wire mesh can be used not only in the area of discrete gas purging elements but also in the area of monolithic gas purging elements (gas purging devices). So, it may be inserted into the hearth bottom of an electric furnace and cast around with a monolithic ceramic mass.
Necessary gas supply elements are associated in an actually known manner.
The wire thickness (width, length or diameter) is typically 0,1 to 1,0 mm. The coating may have a very small diameter (thickness), in order to impede an infiltration of molten metal after its removal (for example by chemical reaction, fusing or burning out). The thickness may be smaller than 0, 3 mm, also smaller than 0, 1 mm. With a small slit width a relatively large cross section of purging is obtained because of the ring channel structure of the channels.
Such a wire mesh, which, for instance, is plastic-coated, is known for constructing fences, for example.
By the present invention a totally different use of such a wire mesh is presented, that is for the production of ceramic gas purging elements and in this for forming a network of pores within a ceramic matrix material after burning out said coating material.
Several techniques are known for producing such refractory ceramic gas purging elements, mostly in the form of discrete gas purging plugs. Particularly, this concerns the formation of pores or channels through which a treating gas may be injected into the molten metal by the gas purging plug.
Basically, three different types of such gas purging elements are known, that ist:
1. gas purging plugs with undirected porosity 2. gas purging plugs with directed porosity 3. so-called gas purging plugs with slitlike channels.
The invention is directed to the second group.
It can be gathered from the DE 195 04 941 A1 that gas purging plugs are known, wherein the gas passage channels are formed with the aid of a three-dimensional network structure wich is produced within the monolithicly cast refractory workpiece with the aid of a tensioning device.
The production of that gas purging plug is described as relatively expensive.
Also, the same document refers to known purging plugs according to DE-OS 38 23 897, wherein threads or stripes are inserted into a casting mould, also with the aid of a tensioning device, which can be pulled out or burned out after the formed piece having set.
The technology describe above for forming channels of pores within refractory gas purging elements has been accepted, particularly for the following reasons: the channels (channels of pores) resulting after burning out the threads or strips mostly consisting of plastic may only have a relatively small cross section (diameter), a maximum cross section of 1 mm being envisaged in most cases. With larger cross sections the risk of infiltration of molten metal increases considerably. However, plastic threads or strips having such small cross sections have only an insufficient inherent stability so that they have to be arranged in said tensioning devices. Then, they are cast around mostly with a refractory casting material. After the refractory material is set the plastic inserts are burned out later in tempering necessary anyway in most cases and/or burning the gas purging element.
On the other hand, the invention provides a substantial technical improvement in that said tensioning devices may be omitted.
It sticks to the technology of channel formers which can be burned outs however, no threads or strips of plastic only but wire meshes being coated by a material which can be burned out are used, which have a considerable inherent stability corresponding to the stability of the metallic basic body and, accordingly, need no or no considerable additional anchorage.
If, for example, the wire mesh is fabricated having a cylindrical shape, it is simply placed on the bottom of a mould for a gas purging plug and subsequently cast around (cast over) with a refractory material. After setting and removing the mould the gas purging plug may be tempered and/or burned to eliminate the coating material which can be burned out so that annular channels result around the "wire ropes", along which the treating gas can be transported through the gas purging body.
It is evident that by selecting appropriate, mostly metallic materials with very small diameters (cross sections) a wire mesh having an appropriate inherent stability may be produced, which is sufficient to keep the formed body stable in shape while casting over the ceramic material. The coating material may be applied in a thin to very thin layer. It may consist of plastic but also of wax, paraffin or like materials which can be burned off.
Also with respect to the shape of the cross section of the individual wires, the idea of the invention is not subject to limitations. Wires having circular cross sections, angular cross sections or the like may be used.
Also, the geometry of the workpiece is almost arbitrary. So, in addition to the cylindrical shape mentioned above the wire mesh may have the shape of a cone or a truncated cone.
Cylinder-like shapes having angular cross sections are conceivable as well; but also formed bodies having a semi-circular cross section, an L-shaped or a U-shaped cross-section are part of the concept of a "formed body"
(workpiece)~ there is only the requirement that it is self-supporting, if it is placed upon a bottom, for example, and that also during the further production process for said ceramic gas purging plugs.
The coated wire meshes can be used not only for the production of cast gas purging plugs of course they can also be employed when the ceramic material is pressed.
With respect to the concrete geometry the term "wire mesh"
allows any embodiment. So, the wire mesh and thus the later structure of the channel system of pores may have a net-like shape. But also main wires (main channels) extending more or less coaxially to each other are conceivable as well, which are connected by individual transversal channels (transversal wires).
A coiled shape of individual wires, possibly on a basic body of wires, is conceivable as well.
Of course, several wire meshes of said type can be fabricated side by side or coaxially.
The wire mesh can be used not only in the area of discrete gas purging elements but also in the area of monolithic gas purging elements (gas purging devices). So, it may be inserted into the hearth bottom of an electric furnace and cast around with a monolithic ceramic mass.
Necessary gas supply elements are associated in an actually known manner.
The wire thickness (width, length or diameter) is typically 0,1 to 1,0 mm. The coating may have a very small diameter (thickness), in order to impede an infiltration of molten metal after its removal (for example by chemical reaction, fusing or burning out). The thickness may be smaller than 0, 3 mm, also smaller than 0, 1 mm. With a small slit width a relatively large cross section of purging is obtained because of the ring channel structure of the channels.
Claims
1. Use of a wire mesh coated with a material which can be burned out, and fabricated as a self-supporting formed body in the production of ceramic gas purging elements for forming a network of pores within a ceramic matrix material after burning out said coating material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19701806A DE19701806C2 (en) | 1997-01-21 | 1997-01-21 | Use of a wire mesh |
| DE19701806.8 | 1997-01-21 | ||
| PCT/DE1998/000085 WO1998031646A1 (en) | 1997-01-21 | 1998-01-12 | Use of a wire mesh |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2278473A1 true CA2278473A1 (en) | 1998-07-23 |
Family
ID=7817823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002278473A Abandoned CA2278473A1 (en) | 1997-01-21 | 1998-01-12 | Use of a wire mesh |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0963363A1 (en) |
| AU (1) | AU6204998A (en) |
| CA (1) | CA2278473A1 (en) |
| DE (2) | DE19701806C2 (en) |
| WO (1) | WO1998031646A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004026959B3 (en) * | 2004-06-02 | 2006-02-16 | Girlich, Dieter, Dr. | Process for producing metallic lattice structures |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2219382B (en) * | 1986-03-28 | 1990-10-31 | Toshin Steel Co | Plug for a refining apparatus |
| DE58900091D1 (en) * | 1988-02-19 | 1991-05-29 | Veitscher Magnesitwerke Ag | GASSPUELSTEIN. |
| DE3823897A1 (en) * | 1988-07-14 | 1990-01-18 | Plibrico Co Gmbh | Apparatus and process for producing refractory blocks |
| DE4039232C2 (en) * | 1990-12-08 | 1995-01-19 | Didier Werke Ag | Process for producing a gas purging plug and gas purging plug |
| DE4312988A1 (en) * | 1993-04-21 | 1994-10-27 | Didier Werke Ag | Refractory ceramic moulding and production process |
| DE19504941C2 (en) * | 1995-02-15 | 1998-05-20 | Knoellinger Horst | Gas purging stone |
-
1997
- 1997-01-21 DE DE19701806A patent/DE19701806C2/en not_active Expired - Fee Related
-
1998
- 1998-01-12 DE DE19880039T patent/DE19880039D2/en not_active Ceased
- 1998-01-12 EP EP98904020A patent/EP0963363A1/en not_active Withdrawn
- 1998-01-12 WO PCT/DE1998/000085 patent/WO1998031646A1/en not_active Application Discontinuation
- 1998-01-12 CA CA002278473A patent/CA2278473A1/en not_active Abandoned
- 1998-01-12 AU AU62049/98A patent/AU6204998A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE19880039D2 (en) | 2000-01-05 |
| DE19701806A1 (en) | 1998-07-23 |
| EP0963363A1 (en) | 1999-12-15 |
| DE19701806C2 (en) | 1998-11-19 |
| AU6204998A (en) | 1998-08-07 |
| WO1998031646A1 (en) | 1998-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |