EP1090149B1 - Composition for removing oxides of alloys of precious metals - Google Patents

Composition for removing oxides of alloys of precious metals Download PDF

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Publication number
EP1090149B1
EP1090149B1 EP99931119A EP99931119A EP1090149B1 EP 1090149 B1 EP1090149 B1 EP 1090149B1 EP 99931119 A EP99931119 A EP 99931119A EP 99931119 A EP99931119 A EP 99931119A EP 1090149 B1 EP1090149 B1 EP 1090149B1
Authority
EP
European Patent Office
Prior art keywords
composition
alloys
oxides
sodium borate
precious metals
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
Application number
EP99931119A
Other languages
German (de)
French (fr)
Other versions
EP1090149A1 (en
Inventor
Rosario Muto
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Individual
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Individual
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Publication date
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Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents

Definitions

  • the invention refers to compositions which allow the removal of the oxides, which are formed either superficially or inside the crystal lattice, from alloys of precious metals or similar with the advantage of stabilising the alloys themselves; the invention refers also to the process of stabilisation comprising the use of such composition.
  • oxides are formed both on the surface and inside the crystal lattice of the metals constituting the alloy. These oxides can be detrimental to the subsequent use of the objects for example by altering their external appearance or causing more serious problems.
  • parts in precious alloys commonly used in dental application capsules, bridges, pins, inlays, etc.
  • the oxides when these are implanted in the mouth of a patient the oxides can, under the saliva action, be attacked and thereafter absorbed by the patient, similarly the properties of the parts of precious alloys used in electronics can be adversely affected by the formation of oxides.
  • the present invention allows one to overcome the above said problems through the use of compositions of gelatine containing sodium borate.
  • compositions once spread on the objects to be treated and thereafter heated, allow the total removal of superficial and internal oxides possibly formed during the previous working phases of the metal alloy and allow the preparation of products which do not present any of the drawbacks caused by the presence of the oxides.
  • a precious metal or similar alloy is an alloy consisting of metals of the groups VIII and Ib of the Periodic Table of Elements, in particular alloys consisting of gold, silver, palladium, iridium, platinum, in all their different possible combinations.
  • the gelatinous product in the composition according to the invention as defined by claim 1 is a gelatinous material capable of burning completely when heated, without leaving any residue.
  • Homogeneous materials i.e. lump-free materials, are preferred since they allow a better spreading of the composition.
  • the gelatinous product is chosen from agar-agar, carrageenin or pure cellulose.
  • the two products forming the composition i.e. the gelatinous product and sodium borate, can be present each in a quantity comprised between 20 - 70% (by weight) of the total; particularly preferred is a composition consisting of 50% sodium borate and 50% gelatine (by weight).
  • the invention further relates to the use of the compositions according to claim 1 or of a composition consisting of sodium borate and gelatine in a treatment for removing oxides from alloys of precious metals.
  • compositions according to the invention can also obviously be used to remove the oxides in the case of objects wherein the precious metal alloy is combined with resins or ceramics making it possible to obtain products having enhanced brightness.
  • composition according to the invention is very simple and is performed by mixing the desired quantities of both components in a mixer, preferably equipped with microniser, under vacuum and in a nitrogen current.
  • the piece to be treated obtained by moulding the melted ingots in the appropriated mould, is cooled, polished and cleaned with vapour jet streams.
  • composition according to the invention is spread with a brush on the surface of the object and dried, normally at 500°C; after drying a white chalk-like patina forms.
  • the alloy is thereafter submitted to thermal annealing or homogenised in oven, normally at 950°C, as indicated by the producer of the alloy.
  • the object is cleaned by ultrasounds and immersion in pickling liquid or hydrofluoric acid 40%, thereafter neutralised in water with bicarbonate and washed with water.
  • alloy-ceramic products are desired the alloy is ceramised according to the usual techniques.
  • alloy-resin objects are desired the above said thermal treatment can be performed in an oven or over the flame.
  • composition according to the invention is particularly useful to remove the oxides on metal parts which must be grinded.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Dental Preparations (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • ing And Chemical Polishing (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Powder Metallurgy (AREA)

Abstract

Described are compositions which allow one to stabilise alloys of precious metals or similar by removing the oxides which are formed on the surface or inside the crystal lattice and the use of such compositions in the processes of stabilisation of the above said alloys.

Description

Field of the Invention
The invention refers to compositions which allow the removal of the oxides, which are formed either superficially or inside the crystal lattice, from alloys of precious metals or similar with the advantage of stabilising the alloys themselves; the invention refers also to the process of stabilisation comprising the use of such composition.
State of the art
It is known that during the melting processes of ingots of alloys of precious metals or similar for the moulding of different objects, both for aesthetic or industrial purposes, oxides are formed both on the surface and inside the crystal lattice of the metals constituting the alloy. These oxides can be detrimental to the subsequent use of the objects for example by altering their external appearance or causing more serious problems. For example in the case of parts in precious alloys commonly used in dental application (capsules, bridges, pins, inlays, etc.), when these are implanted in the mouth of a patient the oxides can, under the saliva action, be attacked and thereafter absorbed by the patient, similarly the properties of the parts of precious alloys used in electronics can be adversely affected by the formation of oxides.
It is therefore evident how important it is to make available a product which allows the removal of the oxides from precious metals alloys.
Detailed description of the invention
The present invention allows one to overcome the above said problems through the use of compositions of gelatine containing sodium borate.
Such compositions once spread on the objects to be treated and thereafter heated, allow the total removal of superficial and internal oxides possibly formed during the previous working phases of the metal alloy and allow the preparation of products which do not present any of the drawbacks caused by the presence of the oxides.
According to the invention a precious metal or similar alloy is an alloy consisting of metals of the groups VIII and Ib of the Periodic Table of Elements, in particular alloys consisting of gold, silver, palladium, iridium, platinum, in all their different possible combinations.
The gelatinous product in the composition according to the invention as defined by claim 1 is a gelatinous material capable of burning completely when heated, without leaving any residue.
Homogeneous materials, i.e. lump-free materials, are preferred since they allow a better spreading of the composition.
For the invention purposes, the gelatinous product is chosen from agar-agar, carrageenin or pure cellulose.
The two products forming the composition, i.e. the gelatinous product and sodium borate, can be present each in a quantity comprised between 20 - 70% (by weight) of the total; particularly preferred is a composition consisting of 50% sodium borate and 50% gelatine (by weight).
The invention further relates to the use of the compositions according to claim 1 or of a composition consisting of sodium borate and gelatine in a treatment for removing oxides from alloys of precious metals.
The compositions according to the invention can also obviously be used to remove the oxides in the case of objects wherein the precious metal alloy is combined with resins or ceramics making it possible to obtain products having enhanced brightness.
The preparation of a composition according to the invention is very simple and is performed by mixing the desired quantities of both components in a mixer, preferably equipped with microniser, under vacuum and in a nitrogen current.
Very simple is also the use of the compositions according to the invention.
The piece to be treated, obtained by moulding the melted ingots in the appropriated mould, is cooled, polished and cleaned with vapour jet streams.
The composition according to the invention is spread with a brush on the surface of the object and dried, normally at 500°C; after drying a white chalk-like patina forms.
The alloy is thereafter submitted to thermal annealing or homogenised in oven, normally at 950°C, as indicated by the producer of the alloy.
The object is cleaned by ultrasounds and immersion in pickling liquid or hydrofluoric acid 40%, thereafter neutralised in water with bicarbonate and washed with water.
If alloy-ceramic products are desired the alloy is ceramised according to the usual techniques.
If alloy-resin objects are desired the above said thermal treatment can be performed in an oven or over the flame.
The composition according to the invention is particularly useful to remove the oxides on metal parts which must be grinded.
In the case of products requiring ceramisation, after elimination of the glasure excess the composition is applied to the metallic part and is heated at a temperature largely inferior to the one requested for the ceramic burning, thereafter the same procedure described above is applied (treatment with ultrasounds, pickling, neutralisation and washing).
By operating as described it is possible, for example, to completely remove the oxides in the internal part of the ceramised dental cups making the surface particularly bright.
Example
30 g of carrageenin are placed in a mixer under vacuum and in nitrogen current and 30 g of sodium borate are added. The products are mixed up to the formation of an homogenous paste which is collected and stoked in fridge up its use.

Claims (7)

  1. Composition consisting of sodium borate and a gelatinous product chosen in the group consisting of:
    agar-agar, carrageenin or pure cellulose.
  2. Composition according to claim 1 wherein the two compounds are present each in a quantity comprised between 20 - 70% by weight calculated on the total weight of the composition.
  3. Composition according to claim 2 containing 50% of sodium borate and 50% of the other product.
  4. Process for the preparation of a composition according to Claim 1 wherein the desired quantities of both components are mixed in a mixer, preferably equipped with microniser, under vacuum and nitrogen current.
  5. Process for removing the oxides from alloys of precious metals of the VIII and Ib groups of the Periodic Table of Elements using a composition according to Claim 1 or a composition consisting of gelatine and sodium borate.
  6. Process according to Claim 5 wherein the alloy contains gold, silver, palladium, iridium, platinum, in all the possible combination.
  7. Use of the compositions according to Claim 1 or of a composition consisting of sodium borate and gelatine in a treatment for removing oxides from alloys of precious metals of the VIII and Ib groups of the Periodic Table of Elements.
EP99931119A 1998-06-22 1999-06-21 Composition for removing oxides of alloys of precious metals Expired - Lifetime EP1090149B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITFI980148 1998-06-22
IT98FI000148A ITFI980148A1 (en) 1998-06-22 1998-06-22 COMPOSITIONS FOR THE ELIMINATION OF OXIDES IN ALLOYS OF PRECIOUS METALS AND SIMILAR METALS AND THEIR USE IN THERMAL STABILIZATION PROCESSES
PCT/EP1999/004283 WO1999067431A1 (en) 1998-06-22 1999-06-21 Composition for removing oxides in alloys of precious metals or similar

Publications (2)

Publication Number Publication Date
EP1090149A1 EP1090149A1 (en) 2001-04-11
EP1090149B1 true EP1090149B1 (en) 2003-05-14

Family

ID=11352608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99931119A Expired - Lifetime EP1090149B1 (en) 1998-06-22 1999-06-21 Composition for removing oxides of alloys of precious metals

Country Status (7)

Country Link
EP (1) EP1090149B1 (en)
AT (1) ATE240411T1 (en)
AU (1) AU4774799A (en)
DE (1) DE69907909T2 (en)
ES (1) ES2200529T3 (en)
IT (1) ITFI980148A1 (en)
WO (1) WO1999067431A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2569057B2 (en) * 1987-07-10 1997-01-08 株式会社日立製作所 X-ray mask defect repair method
ITPO20120002A1 (en) * 2012-02-09 2012-05-10 Emanuele Muto FORMULATED FOR THE ATOMIC KINETIC DEGASSIFICATION TREATMENT OF NOBLE AND PRECIOUS ELEMENTS

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL110744C (en) * 1956-11-16 1900-01-01
GB1095857A (en) * 1966-02-25 1967-12-20 Albi Mfg Company Inc Improved fire-retardant coating composition
GB1229783A (en) * 1967-07-07 1971-04-28
US3661820A (en) * 1970-07-15 1972-05-09 Park Chem Co Coating composition for preventing carburization of steel parts with subsequent water wash-off capacity
GB1438296A (en) * 1972-10-26 1976-06-03 Secretary Industry Brit Prevention of corrosion in metls
DE3046334A1 (en) * 1980-12-09 1982-07-22 Etablissement Dentaire Ivoclar, Schaan INTERRUPTABLE BASE FOR PRODUCING AN INTERMEDIATE LAYER BETWEEN A HIGH-MELTING DENTAL METAL ALLOY AND TOOTHPORCELAIN
JPH068493B2 (en) * 1986-04-22 1994-02-02 三菱電機株式会社 Noble metal coating method
JPH06316744A (en) * 1993-04-30 1994-11-15 Sumitomo Special Metals Co Ltd Production of fe-ni-co series alloy parts for sealing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Ullmanns Encyklopädie der technischen Chemie, 4th edition, Vol. 8, (1974), Verlag Chemie GmbH, Weinheim (DE), 673 *

Also Published As

Publication number Publication date
WO1999067431A1 (en) 1999-12-29
EP1090149A1 (en) 2001-04-11
ES2200529T3 (en) 2004-03-01
ATE240411T1 (en) 2003-05-15
DE69907909D1 (en) 2003-06-18
AU4774799A (en) 2000-01-10
DE69907909T2 (en) 2004-03-11
ITFI980148A1 (en) 1999-12-22

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