BE449838A - - Google Patents
Info
- Publication number
- BE449838A BE449838A BE449838DA BE449838A BE 449838 A BE449838 A BE 449838A BE 449838D A BE449838D A BE 449838DA BE 449838 A BE449838 A BE 449838A
- Authority
- BE
- Belgium
- Prior art keywords
- objects
- precious metal
- support
- precious
- heating
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 239000010970 precious metal Substances 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000002966 varnish Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000001603 reducing Effects 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000001590 oxidative Effects 0.000 claims description 3
- 230000001464 adherent Effects 0.000 claims 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 8
- 229910052737 gold Inorganic materials 0.000 description 8
- 239000010931 gold Substances 0.000 description 8
- 150000002739 metals Chemical class 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 229910000994 Tombac Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- UIFOTCALDQIDTI-UHFFFAOYSA-N arsanylidynenickel Chemical compound [As]#[Ni] UIFOTCALDQIDTI-UHFFFAOYSA-N 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
-
- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
-
- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
- C23C10/26—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions more than one element being diffused
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Adornments (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
<Desc/Clms Page number 1>
"Procédé d'obtention de revêtements en métaux précieux sur des objets et supports métalliques".
La présente invention est relative à l'obtention de revêtements en métaux précieux sur des objets métalliques de natures les plus différentes, par exemple pour la fabrication de bijouterie, articles dentaires, ustensiles de table, boutons d'uniforme, contacts électriques, réseaux de catalyseurs, appareils de physique et de chimie, etc.
Comme métaux de revêtement, on peut utiliser par exemple, l'or, l'argent, le platine, seuls ou à plusieurs, éventuellement avec des métaux non précieux. Comme métaux de support, on peut utiliser, par exemple, le cuivre, le nickel, l'argent ou des alliages en contenant, tels que le laiton, la nickeline, le tombak, le bronze. En outre, on peut utiliser, entre autres, comme métaux de support, des alliages de fer, de zinc, d'aluminium et autres métaux légers.
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<Desc/Clms Page number 2>
Pour mettre en oeuvre l'invention, on procède en appliquant sur le métal de support les métaux précieux servant à faire le revêtement sous forme de poudre fine en suspension dans des liants appropriés, par exemple des solutions de vernis, le liant, par exemple les constituants du vernis, étant ensuite expulsé par combustion dans une atmosphère oxydante, après quoi on chauffe dans une atmosphère réductrice. Lorsqu'on met en suspension dans des solutions de vernis des métaux précieux tels que de l'or, de l'argent, du platine ou métaux analogues ou leurs alliages, qu'on les applique sur les objets métalliques à revêtir et qu'on expulse ensuite en la brûlant la substance du vernis, les métaux précieux.tels que l'or restent sous une forme relativement peu cohérente et adhérant mal.
Mais si l'on chauffe alors les objets dans une atmosphère réductrice, par exemple dans une flamme d'hydrogène, il se forme sur le métal de support, des revêtements en métaux précieux compacts, lisses, brillants et a dhérents. On peut effectuer également la réduc- tion, par exemple, en chauffant les objets dans une atmosphère, par exemple d'oxyde de carbone, d'alcool méthylique, etc.
On peut mettre en oeuvre l'invention, par exemple, en mettant en suspension le métal précieux, par exemple l'or à l'état de fine division, dans un vernis brûlant facilement, par exemple un vernis à base de nitrocellulose, en enduisant de la suspension d'or dans le vernis l'objet métallique à traiter et, après évaporation du solvant, en chauffant l'objet, par exemple dans une flamme de gaz ordinaire ou dans une soufflerie de manière telle que les constituants solides du vernis brûlant, s'en aillent par distillation ou se subliment. L'or se trouve alors sur le métal de support sous forme d'un revêtement de couleur argileuse adhérant relativement mal. Mais si l'on place l'objet dans une flamme d'hydrogène, le revêtement se transforme rapidement en une couche d'or brillante, ayant la couleur de l'or pur et qui adhère solidement sur le support.
On peut encore améliorer l'adhérence du revêtement sur le métal de support en soumettant les objets à une opération de diffusion thermique. L'opération de diffusion peut être effectuée en chauffant un peu plus longtemps dans une atmosphère réductrice.
Au cas où l'on désire une pénétration plus profonde du métal de revêtement dans le métal de support et un ancrage particu- lièrement solide du premier dans le second, on effectue, de façon avantageuse, l'opération de diffusion en plongeant les objets dans des sels en fusion qui sont chauffés à une tempé-
<Desc/Clms Page number 3>
rature convenant pour obtenir la diffusion. Le traitement ultérieur dans un sel en fusion offre l'avantage, par rapport à d'autres procédés de chauffage, que l'on peut éviter des déformations, ce qui est particulièrement important pour des objets très fins ou fragiles, tels que de la bijouterie ou objets analogues.
Pour la mise en oeuvre avec succès du procédé, il est essentiel que les objets soient chauffés, après application de la couche de métal précieux, d'abord en atmosphère oxydante, puis en atmosphère réductrice.
<Desc / Clms Page number 1>
"Process for obtaining precious metal coatings on metal objects and supports".
The present invention relates to obtaining coatings of precious metals on metal objects of the most different types, for example for the manufacture of jewelry, dental articles, table utensils, uniform buttons, electrical contacts, networks of catalysts. , physical and chemical apparatus, etc.
As coating metals, it is possible to use, for example, gold, silver, platinum, singly or in combination, optionally with non-precious metals. As support metals, it is possible to use, for example, copper, nickel, silver or alloys containing them, such as brass, nickeline, tombak, bronze. In addition, it is possible to use, inter alia, as support metals, alloys of iron, zinc, aluminum and other light metals.
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<Desc / Clms Page number 2>
To implement the invention, one proceeds by applying to the support metal the precious metals used to make the coating in the form of fine powder in suspension in suitable binders, for example varnish solutions, the binder, for example constituents of the varnish, then being expelled by combustion in an oxidizing atmosphere, after which it is heated in a reducing atmosphere. When suspending precious metals such as gold, silver, platinum or similar metals or their alloys in solutions of varnish, applying them to metallic objects to be coated and then expels the substance of the varnish by burning it, the precious metals such as gold remain in a relatively inconsistent and poorly adhering form.
But if the objects are then heated in a reducing atmosphere, for example in a hydrogen flame, compact, smooth, shiny and inherent precious metal coatings are formed on the support metal. The reduction can also be carried out, for example, by heating the objects in an atmosphere, for example of carbon monoxide, methyl alcohol, etc.
The invention can be implemented, for example, by suspending the precious metal, for example gold in the state of fine division, in a varnish which burns easily, for example a varnish based on nitrocellulose, by coating suspension of gold in the varnish the metallic object to be treated and, after evaporation of the solvent, by heating the object, for example in an ordinary gas flame or in a blower in such a way that the solid constituents of the hot varnish , go away by distillation or sublimate. The gold is then found on the support metal as a relatively poorly adhering clay-colored coating. But if the object is placed in a hydrogen flame, the coating quickly turns into a shiny gold layer, having the color of pure gold and which adheres firmly to the support.
The adhesion of the coating to the support metal can be further improved by subjecting the objects to a thermal diffusion operation. The diffusion operation can be carried out by heating for a little longer in a reducing atmosphere.
If a deeper penetration of the coating metal into the support metal and a particularly strong anchoring of the first in the second is desired, the diffusion operation is advantageously carried out by dipping the objects in. molten salts which are heated to a temperature
<Desc / Clms Page number 3>
erasure suitable to obtain the diffusion. Further processing in molten salt offers the advantage, over other heating methods, that deformation can be avoided, which is particularly important for very fine or fragile objects, such as jewelry. or similar objects.
For the successful implementation of the process, it is essential that the objects are heated, after application of the precious metal layer, first in an oxidizing atmosphere, then in a reducing atmosphere.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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BE449838A true BE449838A (en) |
Family
ID=105068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE449838D BE449838A (en) |
Country Status (1)
Country | Link |
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BE (1) | BE449838A (en) |
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0
- BE BE449838D patent/BE449838A/fr unknown
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