US9437342B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9437342-B2 |
| Application number | US-201314389444-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 29, 2013 |
| Priority date | Mar 30, 2012 |
| Publication date | Sep 6, 2016 |
| Grant date | Sep 6, 2016 |
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The present invention relates to a new method for preparing a silver-based electrical contact material, comprising following steps of: (a) providing a carbonaceous mesophase solution; (b) adding a silver source into the carbonaceous mesophase solution and stirring to obtain a compound; (c) removing a solvent from the compound to obtain a solid; (d) performing a heat treatment on the solid, and obtaining a silver-based electrical contact material. The silver source is silver powder prepared by means of a chemical method. By means of the method, a uniform carbonaceous coating on silver is implemented, the silver is uniformly distributed in a nanometer scale, and a diamond is generated in situ of a material after being sintered. The silver-based electrical contact material processed by means of this method shows an excellent mechanical wear resistance and electrical property.
Opening claim text (preview).
The invention claimed is: 1. A method for preparing a silver-based electrical contact material, comprising the following steps: (a) providing a carbonaceous mesophase solution; (b) adding a silver source to the carbonaceous mesophase solution under stirring to obtain a mixture; (c) removing a solvent from the mixture to obtain a solid; and (d) subjecting the solid to a heat treatment to obtain a silver-based electrical contact material, wherein the silver source is silver powder prepared by a chemical method; and wherein carbon in the form of diamond is generated in the electrical contact material. 2. The method according to claim 1 , wherein the silver powder has a particle size in the range of from 100 nm to 100 μm. 3. The method according to claim 1 , wherein the carbonaceous mesophase comprises biomass-derived carbonaceous mesophase. 4. The method according to claim 1 , wherein the concentration of the carbonaceous mesophase solution is 0.005 to 6% by weight. 5. The method according to claim 1 , comprising a step of adding a catalyst to the carbonaceous mesophase solution during step (a), step (b) or both. 6. The method according to claim 5 , wherein the catalyst is selected from the group consisting of: iron salts, cobalt salts and nickel salts. 7. The method according to claim 1 , wherein the heat treatment is sintering. 8. The method according to claim 7 , wherein the sintering is performed in a hydrogen-containing atmosphere. 9. The method according to claim 7 , wherein the sintering is performed at a temperature in the range of from 600° C. to 950° C.
Preparation (by using ultra-high pressure B01J3/06; by crystal growth C30B29/04) · CPC title
Micron size particles, i.e. above 1 micrometer up to 500 micrometer · CPC title
Alloys based on silver · CPC title
containing carbon particles or fibres · CPC title
Processes characterised by the sequence of their steps · CPC title
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