GB2236117A - Process for preparing silver powder - Google Patents
Process for preparing silver powder Download PDFInfo
- Publication number
- GB2236117A GB2236117A GB8921253A GB8921253A GB2236117A GB 2236117 A GB2236117 A GB 2236117A GB 8921253 A GB8921253 A GB 8921253A GB 8921253 A GB8921253 A GB 8921253A GB 2236117 A GB2236117 A GB 2236117A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silver powder
- silver
- surface area
- specific surface
- preparing
- 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.)
- Withdrawn
Links
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 17
- 229910052709 silver Inorganic materials 0.000 claims abstract description 14
- 239000004332 silver Substances 0.000 claims abstract description 14
- 229940071575 silver citrate Drugs 0.000 claims abstract description 11
- QUTYHQJYVDNJJA-UHFFFAOYSA-K trisilver;2-hydroxypropane-1,2,3-tricarboxylate Chemical compound [Ag+].[Ag+].[Ag+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O QUTYHQJYVDNJJA-UHFFFAOYSA-K 0.000 claims abstract description 11
- 229920005862 polyol Polymers 0.000 claims abstract description 8
- 150000003077 polyols Chemical class 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- 238000000354 decomposition reaction Methods 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000003985 ceramic capacitor Substances 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract description 15
- 238000006243 chemical reaction Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 4
- -1 Ag+ ions Chemical class 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 239000011164 primary particle Substances 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 229910001961 silver nitrate Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 description 1
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 229960004667 ethyl cellulose Drugs 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229940116411 terpineol Drugs 0.000 description 1
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
- H01G4/0085—Fried electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/30—Making metallic powder or suspensions thereof using chemical processes with decomposition of metal compounds, e.g. by pyrolysis
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention is related to a process for preparing silver powder with high specific surface area, the powder obtained, the use of the powder for preparing silver containing layers and the products obtained by this use. The process comprises decomposing silvercitrate in water, a polyol or mixtures thereof, at a temperature of at least 80 DEG C.
Description
Process for preparing silver powder.
The present invention is directed to a process for preparing silver powder. More in particular the invention is concerned with the production of spherical submicron silver powder.
Submicron silver particles are generally applied in the form of thick-film pastes. There are two types of thickfilm pastes: - high temperature thick-film pastes, and - polymer thick-film paste.
The majority of the silver powders used in high temperature thick-film pastes has a spherical morphology. The pastes is applied to a ceramic substrate by screen printing.
Subsequently the paste is dried and fired to remove all organic material and to obtain a sintered silver pattern.
In general there are four main routes for the production of submicron silver powder. These routes are -reduction of Ag+ ions with an organic reducing agent; -reduction of Ag+ ions with an inorganic reducing agent; -electrodeposition; and -plasma techniques.
The present invention is concerned with the firstmentioned main route, namely reduction of Ag+ ions with an organic reducing agent.
An important aspect in the preparation of silver powders is the final value of the specific surface area, or, in other words, the particle size of the silver powder. For specific purposes it is preferred to prepare powders with a very high specific surface area, e.g. more than 4 m2/g, preferably more than 6 m2/g, more preferably more than 8 m2/g.
In Derwent Abstract 86-112046/17 of SU-A 627,883 a process is described wherein dissolved silver nitrate was mixed with glycerol and heated at high temperature. This yields a metallic silver powder with a relatively low specific surface area.
The present invention aims at obtaining a process for preparing a silver powder with high specific surface area, and comprises decomposing silver citrate in water, in a polyol or in mixtures thereof at a temperature of at least 800 C. The process temperature is preferably between 80 and 1250C.
Surprisingly it has been found that it is possible to obtain silver powders having a high specific surface area, by the very easy method as described hereinabove.
Particularly preferred is a method, whereby silver citrate is decomposed in glycerol at a temperature of at least 1000C, preferably at about 1100C to about 1200C, whereby silver powders are obtained having a specific surface area as high as 11 m2/g. As far as applicant is aware, such silver powders with a specific surface area of > 10.5 m2/g are novel, and do also form part of the invention.
According to another aspect of the invention, silver citrate is decomposed in water at temperatures of 80-1250C, preferably 90-1050C, whereby silver powders are obtained having a specific surface area of 9 m2/g.
According to another embodiment it is possible to use mixtures of polyol and water in the decomposition bath.
A particularly convenient expedient of the present invention lies therein, that by changing the time of decomposition it has become possible to obtain various values of surface area of the silver powder, without influencing the yield. For example decomposition of silver citrate in a polyol can be carried out with 100% yield in 15 minutes, giving a silver powder having a specific surface area of 11 m2/g. Using the same reaction conditions, but with a decomposition time of 50 minutes, the specific surface area changes to 4-5 m2/g.
The process of the present invention can be carried out by dissolving and/or suspending a suitable amount of silver citrate, such as 0.05 to 0.25 mol/l in the solvent to be used which has been preheated to the decomposition temperature. This can be water, a polyol, such as ethylene glycol or glycerol or mixtures thereof. The liquid is maintained at this temperature for the required time. The silver powder can be filtered off and washed in a conventional manner.
In the process of the present invention it is possible to use minor amounts of co-solvents, other than those already specified, provided that these co-solvents do not interfere with the process.
During decomposition the reactor is conventionally stirred.
The silver powder thus obtained can then be mechanically comminuted into smaller agglomerates. The silver powders thus obtained are almost free of organic carbon residues and are build up of spherical primary particles with a narrow primary particle size distribution.
The silver powder can be used for preparing pastes, such as conductive thick-film pastes, which are used for preparing multilayer ceramics, ceramic capacitors, but also for conductive patterns on ceramic or polymeric substrates. In view thereof the present invention also covers the use of silver powders for preparing silver layers on various substrates, such as ceramic and polymeric materials and products thus obtained. Depending on the type of application, the applied film of silver powder containing paste is dried, and optionally sintered. This last embodiment is of course only possible when sinter resistant substrates have been used.
During sintering the silver powder particles form a conductive silver layer.
Suitable high temperature thick-film paste compositions contain ethyl-cellulose, a glass-forming material, terpineol or comparable material and the silver powder, optionally in combination with other metal powders such as palladium.
The composition, which may contain other additives is prepared by mixing and/or milling the components to a paste. The paste is brought onto the surface of a substrate by suitable means, such as a screen printing apparatus.
The printed material can subsequently be dried and, depending on the use, be fired to burn the organic material of the ink. Suitable firing terperatures are between 900 and 11000C.
The present invention is now elucidated on the basis of some examples, which are not intended to limit the invention.
Examples 1 and 2
Silver citrate was prepared by mixing 125 ml of a 0.6 M ammonium citrate solution with 125 ml of a 1.8 M silver nitrate solution. After 5 min. reaction the slurry was filtered over a Bchner-filter and washed 3 times with water and 3 times with ethanol. The precipitate was dried during one night under vacuum at room temperature.
The silver citrate was added to glycerol preheated to 1150C in a 250 ml stirred reaction vessel in an amount corresponding to 0.065 M of Ag+. After 10 min. the reaction was stopped. A spherical powder having a specific surface area of 11 m2/g was obtained.
A repetition of this experiment, wherein the reaction was stopped after 60 min., gave a powder having a specific surface area of 4.5 m2/g.
Example 3
The silver citrate was added to water preheated to 950C in a 250 ml stirred reaction vessel in an amount corresponding to 0.065 M of Ag+. After 10 min. the reaction was stopped. A spherical powder having a specific surface area of 6 m2/g was obtained.
In all experiments the specific surface area was determined using nitrogen adsorption at one nitrogen partial pressure according to the method of Brunauer-Emmet-Teller,
Metals Handbook, 9th Ed., Vol. 7; Powder Metallurgy, pp. 262267.
Claims (13)
1. Process for preparing silver powder, comprising decomposing silver citrate in water, a polyol or mixtures thereof at a temperature of at least 800C.
2. Process according to claim 1, wherein the temperature is at most 2500C.
3. Process according to claim 1 or 2, wherein a polyol is used at a temperature of at least 1000C.
4. Process according to claims 1-3, wherein the silver citrate concentration is between 0.05 and 0.25 mol/l.
5. Process according to anyone of claims 1-4, wherein a polyol, preferably glycerol, is used.
6. Process according to claims 1-5, wherein the decomposition time is between 10 and 60 minutes.
7. Process according to claims 1-6, wherein the specific surface area of the silver powder is regulated by variation of dicomposition time.
8. Process for preparing silver powder as claimed in claim 1, substantially as described hereinbefore, especially with reference to the examples.
9. Silver powder prepared in accordance with the process of claims 1-8.
10. Silver powder having a specific surface area, as determined by N2-adsorption, of at least 10.5 m2/g.
11. Use of the silver powder according to claims 9 or 10 for preparing silver containing layers.
12. Use according to claim 11, for preparing conductive patterns on ceramic and polymeric substrates, and/or in ceramic capacitors.
13. Products obtained by the use of silver powder according to claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8921253A GB2236117A (en) | 1989-09-20 | 1989-09-20 | Process for preparing silver powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8921253A GB2236117A (en) | 1989-09-20 | 1989-09-20 | Process for preparing silver powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8921253D0 GB8921253D0 (en) | 1989-11-08 |
| GB2236117A true GB2236117A (en) | 1991-03-27 |
Family
ID=10663353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8921253A Withdrawn GB2236117A (en) | 1989-09-20 | 1989-09-20 | Process for preparing silver powder |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2236117A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5759230A (en) * | 1995-11-30 | 1998-06-02 | The United States Of America As Represented By The Secretary Of The Navy | Nanostructured metallic powders and films via an alcoholic solvent process |
| WO2000035616A1 (en) * | 1998-12-16 | 2000-06-22 | Celsia S.P.A. | Process for the production of tungsten-copper composite sinterable powders |
| US6197814B1 (en) * | 1997-10-10 | 2001-03-06 | Nvid International, Inc. | Disinfectant and method of making |
| US7435438B1 (en) | 2003-05-16 | 2008-10-14 | Pure Bioscience | Disinfectant and method of use |
| US7601755B2 (en) | 2000-04-06 | 2009-10-13 | Pure Bioscience | Process for treating water |
| RU2389808C1 (en) * | 2008-09-01 | 2010-05-20 | Государственное образовательное учреждение высшего профессионального образования "Курский государственный университет" | Procedure for production of nano-particles of noble metals |
| US7732486B2 (en) | 2003-08-28 | 2010-06-08 | Pure Bioscience | Anhydrous silver dihydrogen citrate compositions |
| RU2424339C1 (en) * | 2009-12-22 | 2011-07-20 | Государственное образовательное учреждение высшего профессионального образования Курский государственный технический университет | Procedure for production of nano particles of gold from iron ore stock |
| RU2430169C2 (en) * | 2006-12-20 | 2011-09-27 | Сервисьос Административос Пеньолес С.А. Де К.В. | Manufacturing method of nanometre, monodisperse and stable metallic silver and products obtained from it |
| RU2455120C1 (en) * | 2010-11-03 | 2012-07-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Юго-Западный государственный университет" (ЮЗГУ) | Method to produce metal nanoparticles protected against oxidation |
| RU2516153C2 (en) * | 2012-03-20 | 2014-05-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Юго-Западный государственный университет" (ЮЗГУ) | Method of production of gold nanoparticles from raw material containing iron and non-ferrous metals |
| RU2566240C1 (en) * | 2014-04-25 | 2015-10-20 | Федеральное государственное бюджетное учреждение науки Институт проблем химической физики Российской академии наук (ИПХФ РАН) | Method of production of gold nanoparticles |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU411961A1 (en) * | 1972-05-10 | 1974-01-25 | Ю. И. Химченко , Л. С. Радкевич | METHOD OF OBTAINING SMALL-DISPERSED METAL POWDERS |
-
1989
- 1989-09-20 GB GB8921253A patent/GB2236117A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU411961A1 (en) * | 1972-05-10 | 1974-01-25 | Ю. И. Химченко , Л. С. Радкевич | METHOD OF OBTAINING SMALL-DISPERSED METAL POWDERS |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5759230A (en) * | 1995-11-30 | 1998-06-02 | The United States Of America As Represented By The Secretary Of The Navy | Nanostructured metallic powders and films via an alcoholic solvent process |
| US6197814B1 (en) * | 1997-10-10 | 2001-03-06 | Nvid International, Inc. | Disinfectant and method of making |
| US7803407B2 (en) | 1997-10-10 | 2010-09-28 | Pure Bioscience | Disinfectant and method of making |
| WO2000035616A1 (en) * | 1998-12-16 | 2000-06-22 | Celsia S.P.A. | Process for the production of tungsten-copper composite sinterable powders |
| US7601755B2 (en) | 2000-04-06 | 2009-10-13 | Pure Bioscience | Process for treating water |
| US7763297B2 (en) | 2003-05-16 | 2010-07-27 | Pure Bioscience | Disinfectant and method of use |
| US7435438B1 (en) | 2003-05-16 | 2008-10-14 | Pure Bioscience | Disinfectant and method of use |
| US7732486B2 (en) | 2003-08-28 | 2010-06-08 | Pure Bioscience | Anhydrous silver dihydrogen citrate compositions |
| RU2430169C2 (en) * | 2006-12-20 | 2011-09-27 | Сервисьос Административос Пеньолес С.А. Де К.В. | Manufacturing method of nanometre, monodisperse and stable metallic silver and products obtained from it |
| RU2389808C1 (en) * | 2008-09-01 | 2010-05-20 | Государственное образовательное учреждение высшего профессионального образования "Курский государственный университет" | Procedure for production of nano-particles of noble metals |
| RU2424339C1 (en) * | 2009-12-22 | 2011-07-20 | Государственное образовательное учреждение высшего профессионального образования Курский государственный технический университет | Procedure for production of nano particles of gold from iron ore stock |
| RU2455120C1 (en) * | 2010-11-03 | 2012-07-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Юго-Западный государственный университет" (ЮЗГУ) | Method to produce metal nanoparticles protected against oxidation |
| RU2516153C2 (en) * | 2012-03-20 | 2014-05-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Юго-Западный государственный университет" (ЮЗГУ) | Method of production of gold nanoparticles from raw material containing iron and non-ferrous metals |
| RU2566240C1 (en) * | 2014-04-25 | 2015-10-20 | Федеральное государственное бюджетное учреждение науки Институт проблем химической физики Российской академии наук (ИПХФ РАН) | Method of production of gold nanoparticles |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8921253D0 (en) | 1989-11-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR960010247B1 (en) | Method for preparing palladium and palladium oxide powder by aerosol decomposition | |
| US4463030A (en) | Process for forming novel silver powder composition | |
| KR100333466B1 (en) | Base coating paste, its manufacturing method and its use | |
| US4186244A (en) | Novel silver powder composition | |
| DE69132237T2 (en) | HIGH TEMPERATURE BURNING PASTE | |
| GB2236117A (en) | Process for preparing silver powder | |
| EP0662521B1 (en) | Method for making silver-palladium alloy powders by areosol decomposition | |
| US4333966A (en) | Method of forming a conductive metal pattern | |
| EP0517738B1 (en) | Improved ceramic dielectric compositions and method for enhancing dielectric properties | |
| DE69118172T2 (en) | DIELECTRIC CERAMIC COMPOSITION AND METHOD FOR THEIR PRODUCTION | |
| EP0120243B1 (en) | Process for the removal of carbon residues during sintering of ceramics | |
| KR100258007B1 (en) | Process for preparing metal powder | |
| KR101927476B1 (en) | Silver powder and manufacturing method of the same | |
| EP0249366B1 (en) | Process for the production of silver-palladium alloy fine powder | |
| EP1301434A2 (en) | Nanoscale corundum powders, sintered compacts produced from these powders and method for producing the same | |
| JPWO2005123307A1 (en) | Nickel powder and method for producing the same | |
| EP3670028A1 (en) | Silver powder and production method thereof | |
| WO2009026789A1 (en) | Process for preparing powder of niobium suboxides or niobium | |
| JP7272834B2 (en) | Silver powder and its manufacturing method | |
| US20230134905A1 (en) | Method for preparing silver-copper mixture powder of core-shell structure using wet process | |
| JPS621807A (en) | Metal powder manufacturing method | |
| KR900004108B1 (en) | How to form a solid solution | |
| JP2021152216A (en) | Phosphorus-containing silver powder and conductive paste containing the silver powder | |
| KR102017177B1 (en) | A method for preparing high-purity silver nano powder using wet process | |
| GB2236116A (en) | Nodular silver powder and process for preparing silver powder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |