EP0597284B1 - Isolationsverfahren für weichmagnetische Bänder - Google Patents
Isolationsverfahren für weichmagnetische Bänder Download PDFInfo
- Publication number
- EP0597284B1 EP0597284B1 EP93116910A EP93116910A EP0597284B1 EP 0597284 B1 EP0597284 B1 EP 0597284B1 EP 93116910 A EP93116910 A EP 93116910A EP 93116910 A EP93116910 A EP 93116910A EP 0597284 B1 EP0597284 B1 EP 0597284B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- salts
- solution
- semi
- salt
- magnesium
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
- C23C18/1208—Oxides, e.g. ceramics
- C23C18/1216—Metal oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
- H01F1/18—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
Definitions
- the invention relates to a method for manufacturing an electrically insulating coating made of magnesium and / or Alumina on a surface of a soft magnetic semi-finished product.
- Soft magnetic in a variety of applications Semi-finished products, such as sheets, strips or parts, it is necessary the semi-finished product with an electrically insulating Cover.
- the individual layers of the magnetic material be electrically isolated from each other.
- a suitable one Isolation process for this application is for example known from U.S. Patent 2,796,364.
- a solution of magnesium in an alcohol made from the Group methyl alcohol, ethyl alcohol and propyl alcohol is selected, applied.
- the tapes or parts to be insulated can, for example be immersed in the solution. In a subsequent one Drying evaporates all volatile components and there remains a layer that is only about 0.5 ⁇ m thick back from magnesium oxide insulation. Should be a higher one Layer thickness can be achieved is a multiple pass required.
- the tapes or parts coated in this way can be retrofitted due to the small layer thickness Machining without excessive tool wear.
- the high system engineering is disadvantageous Effort due to explosion protection measures and the toxicity of methanol.
- it is Resistance to such layers to a maximum of approximately Limited to 1000 ° C.
- the use of the analog aluminum connection in such a procedure fails because of the even more pronounced sensitivity to moisture this connection.
- a method is known from US Pat. No. 2,904,975 which is a solution of a resin, magnesium hydroxide, Bentonite, alcohol and water in certain weight ratios is applied. The solution is towards that applied to coating surfaces and at a Temperature of about 150 ° C dried and cured. The sheets treated in this way become a sheet stack layered on top of each other and then heat treated at a temperature above 900 ⁇ C in subjected to a reducing atmosphere. This will Resin is removed from the layer and one remains Magnesium oxide and bentonite coating.
- DE-AS 21 30 274 and DE-AS 21 46 344 address the problem of tool life when processing coated electrical sheets. According to DE-AS 21 30 274, the tool life is to be extended in that the insulating coating contains a mixture of sodium or potassium silicate together with calcium silicate. DE-AS 21 46 344 proposes a certain roughness of the electrical sheet and / or the organic insulation coating.
- US-A-3 073 722 discloses the application of a suspension of a carboxylic acid and magnesium hydroxide on the surface a silicon steel strip material and the following Drying the suspension to adhere to the material To leave film essentially consisting of magnesium hydroxide so that the material is processed into magnetic cores can be annealed at 950-1200 ° C.
- oxide ceramics Dispense particles such as B. silanol or Titanium insulation can be provided for the intended Purpose of use either because of an intolerance of the insulation medium with the usual soft magnetic Nickel or cobalt alloys or because of too little Resistance to glow in a reducing atmosphere is not deploy.
- the object of the invention is therefore an insulation method indicate that the insulation is soft magnetic Tapes allowed, especially after application the insulation solution still further shaping processing steps be made.
- the procedure is supposed to the otherwise usual direct use of oxide ceramic There are no insulation grains and therefore a reduction of the inevitable tool wear. Furthermore, the process is said to be flammable or toxic otherwise unsafe working or auxiliary materials dispense.
- the object is achieved with the method specified in claim 1 solved.
- the method according to the invention is based on the use of water-soluble organic or inorganic Salts of aluminum and / or magnesium.
- the corresponding oxides are formed only by a downstream heat treatment. This is it possible mechanical processing before the formation of the actually perform insulating ceramic oxide grain and thus increase the service life of the tools.
- the method according to the invention is therefore initially a relatively ductile, very good adhesion, with salts of Aluminum and / or magnesium pigmented paint film applied to the semi-finished products to be insulated.
- the solution can also binders, wetting agents and rheological Contain additives.
- Organic insulation materials are preferred Salts of aluminum and / or magnesium are used.
- the salts of Formic, acetic or benzoic acid With these salts there is high water solubility and good Temperature resistance up to a temperature range from approx. 150 - 200 ° C. This enables a largely decomposition-free drying of the pigmented with salts Solution film. Above the temperatures mentioned there is a gradual decomposition of the described Salts in aluminum or magnesium oxide with elimination of free organic acid. This will be given at appropriate Temperatures or in the hydrogen flame of the Protective gas is oxidatively split into carbon dioxide and water. So there are none during the annealing treatment corrosive or harmful fission products. In addition, there is especially when using the formic acids Salts a particularly favorable ratio between the used soluble salt and the resulting resistant part of the insulation.
- the proportion of salt in the solution is preferably at least 4% by weight.
- nonionic or anionic dispersion polymers of Acrylic or methacrylic esters are used.
- Methacrylic dispersions stand out for this application due to a very high pigment binding ability and due to good depolymerization behavior during the Glowing off.
- a suitable ester the film hardness of the insulation film necessary processing conditions within wide limits to adjust.
- a water- or alkali-soluble Polymers e.g. polyvinyl alcohol or Polymethacrylic acid
- This behavior can occasionally clean the coating systems used simplify considerably.
- binders e.g. B. based on polyvinyl acetate or polystyrene dispersions or similar connections is also possible.
- Emulsifiers for setting a defined wetting behavior and the smallest possible surface tension of the Coating solution are essentially non-ionic Emulsifiers in question.
- Emulsifiers from the group of Alkylphenyl polyglycol ether used. These emulsifiers are characterized by very good emulsifying effects only moderately pronounced foam formation.
- the degree of ethoxylation can be varied Emulsifier properties vary within wide limits. Products with medium and high degree of ethoxylation. The use of other, non-ionic Emulsifiers are also possible.
- the viscosity of the coating solution can be in the range from a few mPas to a few 10 Pas practically infinitely the used Adjust the application process to the circumstances required.
- the application process was both a simple immersion process (Vacuum impregnation) as well as various continuous processes used. To achieve very Thin layers can be made especially with a simple Continuous process to be worked.
- the coating solution is used without thickener additive.
- Such a method typically uses layer thicknesses obtained in the range below 1 ⁇ m. Should be bigger Layer thicknesses are realized, for. B. the possibility the thickened insulation solution by means of profiled rubber rollers on the strip to be coated to apply. The layer thickness essentially becomes on the viscosity of the coating solution and the Profile depth of the coating rollers used determined. In this test, layer thicknesses were determined using this method between approx. 2 and 8 ⁇ m. The usage other order processes, e.g. B.
- a rotary screen printing or spraying process is basically possible.
- Pretreatment of the semi-finished products to be coated is in usually not required.
- One from possibly previous ones Rolling processes of customary oil covering of a crystalline strip material to be coated usually caused no problems. Should be in individual cases achieved a particularly good adhesion of the coating there is the possibility of a degreasing treatment of the tapes the adhesive strength of the coating to further increase.
- amorphous Alloy tapes are usually not the liability of the Coating impurities available.
- a solution was used for the insulation of soft magnetic amorphous tapes based on cobalt (VITROVAC 6030) from: salt Al triformiate 4% by weight Wetting agent Arkopal N100 0.05% by weight water rest
- the formulation described has a current one Viscosity of approx. 4 - 4.5 Pas and a pH between 3,5 and 4.
- the resulting from the aluminum formate Alumina is up to temperatures around 1200 ° C can be used as an insulator practically without burning and therefore for example for the isolation of crystalline nickel-based alloys suitable.
- insulation layer thicknesses below or around 1 ⁇ m can be achieved in one pass without profile rollers: salt Al triformiate 4 - 8% by weight Wetting agent Arkopal N 100 0.2% by weight binder Plextol B 500 1.0% by weight water Rest.
- a mixture of basic magnesium acetate and magnesium benzoate, for example, is also particularly suitable for dip insulation.
- the salts were produced directly by reacting chemically pure magnesium oxide and the organic acids mentioned.
- the solution was thus prepared from the following components (rest of water): insulator Magnesium oxide 3.0% by weight acetic acid 7.0% by weight Benzoic acid 1.5% by weight Wetting agent Arkopal N 100 0.05% by weight.
- aqueous solutions described can by a Combination of aluminum and magnesium salts as well through other binders or wetting agents in diverse To be modified.
- organic anions of the insulator salt with a of the alloy elements from the material to be insulated establish a difficultly soluble connection and so one corrosive attack of the insulation solution on the to prevent or minimize insulating tape / part.
- special corrosion inhibitors are required add or compliance with a certain pH range by adding special buffer substances ensure.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Power Engineering (AREA)
- Chemical Treatment Of Metals (AREA)
Description
Nach der DE-AS 21 30 274 soll die Werkzeugstandzeit dadurch verlängert werden, daß die isolierende Beschichtung ein Gemisch aus Natrium- oder Kaliumsilikat zusammen mit Kalzium-Silikat enthält. In DE-AS 21 46 344 wird eine bestimmte Rauhigkeit des Elektroblechs und/oder des organischen Isolationsüberzugs vorgeschlagen.
Salz | Al-triformiat | 4 Gew.-% |
Netzmittel | Arkopal N100 | 0,05 Gew.-% |
Wasser | Rest |
Salz | Al-triformiat | 24,7 Gew.-% |
Netzmittel | Arkopal N 300 | 1,25 Gew.-% |
Binderdispersion | Plextol B 500 | 6,3 Gew.-% |
Binderdispersion | Rohagit SD 15 | 8,9 Gew.-% |
Verdicker | Cullulose H 30 000YP | 0,7 Gew.-% |
Wasser | Rest |
Salz | Al-triformiat | 4 - 8 Gew.-% |
Netzmittel | Arkopal N 100 | 0,2 Gew.-% |
Binder | Plextol B 500 | 1,0 Gew.-% |
Wasser | Rest. |
Isolator | Magnesiumoxid | 3,0 Gew.-% |
Essigsäure | 7,0 Gew.-% | |
Benzoesäure | 1,5 Gew.-% | |
Netzmittel | Arkopal N 100 | 0,05 Gew.-% . |
Claims (10)
- Verfahren zur Herstellung eines elektrisch isolierenden Überzugs aus Magnesium- und/oder Aluminiumoxid auf einer Oberfläche eines weichmagnetischen Halbzeugs durch Aufbringen einer wäßrigen Lösung auf die Oberfläche, die ausschließlich gelöstes Magnesium- und/oder Aluminium-Salz enthält, durch anschließende Durchführung formgebender Bearbeitungsschritte und einer erst nach diesen Bearbeitungsschritten folgenden Wärmebehandlung des Halbzeugs bei einer Temperatur oberhalb der Zersetzungstemperatur des Salzes zur Bildung des Magnesium- und/oder Aluminiumoxids.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Lösung weiterhin Bindemittel, Netzmittel und/oder rheologische Additive enthält.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß es sich um organische Salze handelt.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß es sich um Salze der Ameisen-, Essig- oder Benzoesäure handelt.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Anteil der Salze in der Lösung mehr als 4 Gew.-% beträgt.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die mit der Lösung versehenen Halbzeuge zunächst getrocknet und einer formgebenden Bearbeitung wie z.B. Stanzen, Schneiden oder Teilen unterzogen werden bevor die Wärmebehandlung bei einer Temperatur oberhalb der Zersetzungstemperatur der Salze durchgeführt wird.
- Verfahren nach Anspruch 6, dadurch gekennzeichnet , daß weiterhin eine Glühbehandlung zur Verbesserung der weichmagnetischen Eigenschaften durchgeführt wird.
- Verfahren nach Anspruch 7, dadurch gekennzeichnet , daß die Wärmebehandlung zur Zersetzung des Aluminium- und/oder Magnetsiumsalzes in die Glühbehandlung zur Verbesserung der weichmagnetischen Eigenschaften nach der formgebenden Bearbeitung integriert ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet , daß es sich um Halbzeug aus Nickel- oder Kobaltbasislegierungen handelt.
- Anwendung des Isolationsverfahrens nach einem der vorhergehenden Ansprüche in einem Verfahren zur Herstellung von Magnetkernen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4238150 | 1992-11-12 | ||
DE4238150A DE4238150A1 (de) | 1992-11-12 | 1992-11-12 | Isolationsverfahren für weichmagnetische Bänder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0597284A1 EP0597284A1 (de) | 1994-05-18 |
EP0597284B1 true EP0597284B1 (de) | 1998-01-21 |
Family
ID=6472680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93116910A Expired - Lifetime EP0597284B1 (de) | 1992-11-12 | 1993-10-20 | Isolationsverfahren für weichmagnetische Bänder |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0597284B1 (de) |
DE (2) | DE4238150A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10324910A1 (de) * | 2003-05-30 | 2004-12-23 | Vacuumschmelze Gmbh & Co. Kg | Metallischer Gegenstand mit elektrisch isolierender Beschichtung sowie Verfahren zur Herstellung einer elektrisch isolierenden Beschichtung |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19754996C2 (de) * | 1997-12-11 | 2000-07-06 | Krupp Vdm Gmbh | Verfahren zur Beschichtung magnetischer Bänder oder Bleche |
DE102006019613B4 (de) * | 2006-04-25 | 2014-01-30 | Vacuumschmelze Gmbh & Co. Kg | Magnetkern, Verfahren zu seiner Herstellung sowie seine Verwendung in einem Fehlerstromschutzschalter |
DE102020134300A1 (de) * | 2020-12-18 | 2022-06-23 | Vacuumschmelze Gmbh & Co. Kg | Wasserbasierte alkalische Zusammensetzung zum Bilden einer Isolationsschicht eines Glühseparators, beschichtete weichmagnetische Legierung und Verfahren zum Herstellen eines beschichteten weichmagnetischen Bandes |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3073722A (en) * | 1961-03-30 | 1963-01-15 | Gen Electric | Process for coating ferrous material and material coated by such process |
JPS6487779A (en) * | 1987-09-29 | 1989-03-31 | Hoya Corp | Formation of metal oxide film |
EP0508399A2 (de) * | 1991-04-08 | 1992-10-14 | Mitsubishi Gas Chemical Company, Inc. | Verfahren zur Herstellung von Substraten mit dünner Film-Beschichtung |
-
1992
- 1992-11-12 DE DE4238150A patent/DE4238150A1/de not_active Withdrawn
-
1993
- 1993-10-20 DE DE59308035T patent/DE59308035D1/de not_active Expired - Fee Related
- 1993-10-20 EP EP93116910A patent/EP0597284B1/de not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10324910A1 (de) * | 2003-05-30 | 2004-12-23 | Vacuumschmelze Gmbh & Co. Kg | Metallischer Gegenstand mit elektrisch isolierender Beschichtung sowie Verfahren zur Herstellung einer elektrisch isolierenden Beschichtung |
DE10324910B4 (de) * | 2003-05-30 | 2005-05-25 | Vacuumschmelze Gmbh & Co. Kg | Metallisches Halbzeug mit elektrisch isolierender Beschichtung sowie Verfahren zur Herstellung einer elektrisch isolierenden Beschichtung |
Also Published As
Publication number | Publication date |
---|---|
DE59308035D1 (de) | 1998-02-26 |
EP0597284A1 (de) | 1994-05-18 |
DE4238150A1 (de) | 1994-05-19 |
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