CN103614578A - Preparation method of palladium-tungsten alloy - Google Patents
Preparation method of palladium-tungsten alloy Download PDFInfo
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- CN103614578A CN103614578A CN201310643111.XA CN201310643111A CN103614578A CN 103614578 A CN103614578 A CN 103614578A CN 201310643111 A CN201310643111 A CN 201310643111A CN 103614578 A CN103614578 A CN 103614578A
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Abstract
The invention relates to a preparation method of a palladium-tungsten alloy, which comprises the following steps: (1) cleaning raw materials, and carrying out special casting mold surface passivation treatment; (2) adding the raw materials into a high-frequency induction smelting furnace, carrying out high-temperature vacuum smelting, alloying, degassing, and casting into the treated casting mold in the step (1); and (3) carrying out heat treatment, hot working and cold working on the cast ingot to obtain the product. Compared with the prior art, the palladium-tungsten alloy prepared by the method has favorable chemical components and mechanical properties, and the resistivity rho is greater than 110 mu ohm. Cm.
Description
Technical field
The present invention relates to precious metal precision resistance material, particularly relate to the preparation method of palladium tungsten based alloy.
Background technology
Palladium tungstenalloy is described as the most promising precious metal precision resistance material, there is high resistivity, low temperature coefficient of resistance, high hardness and intensity, good wear resistance and oxidation-resistance etc., because W is the metal of high-melting-point, high rigidity, high fragility, crisp in the palladium tungstenalloy course of processing, split, disconnected phenomenon is serious, processibility extreme difference, mass production difficulty.
Summary of the invention
Object of the present invention is exactly in order to overcome the defect that above-mentioned prior art exists, to provide that a kind of method is simple, the preparation method of the palladium tungsten based alloy of electricalresistivityρ >110 μ Ω cm.
Object of the present invention can be achieved through the following technical solutions: the preparation method of palladium tungsten based alloy, it is characterized in that, and the method comprises the following steps:
(1) starting material are cleaned and casting mold surface passivating treatment;
(2) by purity, be Pd >=99.99%, W >=99.95% metal charge hydrochloric acid cleaning, by composition weight percent, W is 5-15, surplus is Pd, prepare burden, drop in high-frequency induction smelting furnace high-temperature vacuum melting, alloying, the processing such as degasification, are cast in that step (1) is treated waters in injection molding;
(3) ingot casting, through Overheating Treatment, hot-work, cold working, obtains product.
Described starting material comprise high purity metal stock and foundry returns.
Described foundry returns is the materials such as product stub bar, scrap stock, pollution-free or non-oxidation.
Described starting material and foundry returns clean and adopt hydrochloric acid cleaning.
Casting mold surface passivation agent is high-purity alumina powder.
Hot-work adopts free drawing technology, and ruhmkorff coil power is 20～35KW, and drawing speed is 0.4～1.0mm/s, single pass heavy deformation >20%, total deformation >90%.
Embodiment elaborates to the present invention below in conjunction with embodiment.
Embodiment mono-
(1) by purity, be Pd >=99.99%, W >=99.95% metal charge hydrochloric acid cleaning, by composition weight percent, PdW5 prepares burden, casting mold surface passivating treatment;
(2) starting material are dropped in high-frequency induction smelting furnace, high-temperature vacuum melting, alloying, the processing such as degasification repeatedly, pours into bar etc.;
(3) ingot casting bar is through vacuum heat treatment, and on free drawing equipment, ruhmkorff coil power is 20～35KW, drawing speed is 0.4～1.0mm/s, single pass heavy deformation >20%, total deformation >90%, it is 1mm that final hot-work goes out process wire;
(4) in accurate drawing wire machine material from 1mm cold deformation to 0.06mm.
Embodiment bis-:
(1) by purity, be Pd >=99.99%, W >=99.95% metal charge hydrochloric acid cleaning, by composition weight percent, PdW10 prepares burden, casting mold surface passivating treatment;
(2) starting material are dropped in high-frequency induction smelting furnace, high-temperature vacuum melting, alloying, the processing such as degasification repeatedly, pours into bar etc.;
(3) ingot casting bar is through vacuum heat treatment, and on free drawing equipment, ruhmkorff coil power is 20～35KW, drawing speed is 0.4～1.0mm/s, single pass heavy deformation >20%, total deformation >90%, it is 1mm that final hot-work goes out process wire;
(4) in accurate drawing wire machine material from 1mm cold deformation to 0.06mm.
Embodiment tri-
(1) by purity, be Pd >=99.99%, W >=99.95% metal charge hydrochloric acid cleaning, by composition weight percent, PdW15 prepares burden, casting mold surface passivating treatment;
(2) starting material are dropped in high-frequency induction smelting furnace, high-temperature vacuum melting, alloying, the processing such as degasification repeatedly, pours into bar etc.;
(3) ingot casting bar is through vacuum heat treatment, and on free drawing equipment, ruhmkorff coil power is 20～35KW, drawing speed is 0.4～1.0mm/s, single pass heavy deformation >20%, total deformation >90%, it is 1mm that final hot-work goes out process wire;
(4) in accurate drawing wire machine material from 1mm cold deformation to 0.06mm.
The data performance of each embodiment is built table 1
The data performance of each embodiment of table 1
Claims (6)
1. a preparation method for palladium tungsten based alloy, is characterized in that, the method comprises the following steps:
(1) high purity metal stock is cleaned and casting mold surface passivating treatment;
(2) by purity, be Pd >=99.99%, W >=99.95% metal charge hydrochloric acid cleaning, by composition weight percent W, be 5-15, surplus is Pd, prepares burden, and starting material are dropped in high-frequency induction smelting furnace, high-temperature vacuum melting, alloying, degassing processing, is cast in that step (1) is treated waters in injection molding;
(3) ingot casting, through Overheating Treatment, hot-work, cold working, obtains product.
2. the preparation method of a kind of palladium tungsten based alloy according to claim 1, is characterized in that, described starting material comprise high purity metal stock and foundry returns.
3. according to the preparation method of a kind of palladium tungsten based alloy described in patent claim 2, its special type is, described foundry returns is one or more in product stub bar, scrap stock, pollution-free or non-oxidation material.
4. according to patent, require the preparation method of a kind of palladium tungsten based alloy described in 1, it is characterized in that, described starting material and foundry returns clean and adopt hydrochloric acid cleaning.
5. according to patent, require the preparation method of a kind of palladium tungsten based alloy described in 1, it is characterized in that, casting mold surface passivation agent is high-purity alumina powder.
6. according to patent, require the preparation method of a kind of palladium tungsten based alloy described in 1, it is characterized in that, hot-work adopts free drawing technology, ruhmkorff coil power is 20～35KW, drawing speed is 0.4～1.0mm/s, single pass heavy deformation >20%, total deformation >90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310643111.XA CN103614578A (en) | 2013-09-10 | 2013-12-03 | Preparation method of palladium-tungsten alloy |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310409058.7 | 2013-09-10 | ||
| CN 201310409058 CN103468985A (en) | 2013-09-10 | 2013-09-10 | Preparation method of palladium-tungsten alloy |
| CN201310643111.XA CN103614578A (en) | 2013-09-10 | 2013-12-03 | Preparation method of palladium-tungsten alloy |
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| CN103614578A true CN103614578A (en) | 2014-03-05 |
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| CN 201310409058 Withdrawn CN103468985A (en) | 2013-09-10 | 2013-09-10 | Preparation method of palladium-tungsten alloy |
| CN201310643111.XA Pending CN103614578A (en) | 2013-09-10 | 2013-12-03 | Preparation method of palladium-tungsten alloy |
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| CN 201310409058 Withdrawn CN103468985A (en) | 2013-09-10 | 2013-09-10 | Preparation method of palladium-tungsten alloy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232976A (en) * | 2014-08-26 | 2014-12-24 | 盐城市鑫洋电热材料有限公司 | Palladium alloy and preparation method thereof |
| CN104232975A (en) * | 2014-08-27 | 2014-12-24 | 昆明贵金属研究所 | Palladium alloy and preparation method thereof |
| CN107841647A (en) * | 2017-10-17 | 2018-03-27 | 昆明贵金属研究所 | A kind of palladium-base alloy resistance-strain material and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2890114A (en) * | 1952-08-19 | 1959-06-09 | Heraeus Gmbh W C | Potentiometer electrical resistance elements of palladium base alloys |
| CN102522137A (en) * | 2012-01-12 | 2012-06-27 | 昆明贵金属研究所 | Palladium-based alloy electrical contact material and preparation method for same |
-
2013
- 2013-09-10 CN CN 201310409058 patent/CN103468985A/en not_active Withdrawn
- 2013-12-03 CN CN201310643111.XA patent/CN103614578A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2890114A (en) * | 1952-08-19 | 1959-06-09 | Heraeus Gmbh W C | Potentiometer electrical resistance elements of palladium base alloys |
| CN102522137A (en) * | 2012-01-12 | 2012-06-27 | 昆明贵金属研究所 | Palladium-based alloy electrical contact material and preparation method for same |
Non-Patent Citations (1)
| Title |
|---|
| 尹俊美等: "PdW20合金组织与性能研究", 《贵金属》, vol. 34, no. 2, 31 May 2013 (2013-05-31), pages 20 - 25 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232976A (en) * | 2014-08-26 | 2014-12-24 | 盐城市鑫洋电热材料有限公司 | Palladium alloy and preparation method thereof |
| CN104232975A (en) * | 2014-08-27 | 2014-12-24 | 昆明贵金属研究所 | Palladium alloy and preparation method thereof |
| CN107841647A (en) * | 2017-10-17 | 2018-03-27 | 昆明贵金属研究所 | A kind of palladium-base alloy resistance-strain material and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN103468985A (en) | 2013-12-25 |
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Application publication date: 20140305 |