CN105463235A - Preparation method for silver-iron-rhenium electric contact material - Google Patents
Preparation method for silver-iron-rhenium electric contact material Download PDFInfo
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- CN105463235A CN105463235A CN201510977497.7A CN201510977497A CN105463235A CN 105463235 A CN105463235 A CN 105463235A CN 201510977497 A CN201510977497 A CN 201510977497A CN 105463235 A CN105463235 A CN 105463235A
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- Prior art keywords
- powder
- silver
- conducted
- rhenium
- iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/06—Alloys based on silver
-
- 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
- B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
- B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0466—Alloys based on noble metals
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Powder Metallurgy (AREA)
- Contacts (AREA)
Abstract
The invention discloses a preparation method for a silver-iron-rhenium electric contact material. The preparation method is characterized by comprising the following specific steps that a, powder is mixed; b, roasting is conducted; c, reduction is conducted; d, ball-milling and sieving are conducted; e, powder is mixed, 320 meshes of 99.99% silver powder and 200 meshes of iron-rhenium alloy powder are mixed through a ploughing blade type powder mixing machine; f, isostatic pressing is conducted, an oil medium is subjected to cold isostatic pressing molding, the working pressure is 160-180 MPa, the pressure maintaining time is 90-120 seconds, and the size of a molded bar ingot is phi90x400 mm; g, sintering is conducted at the temperature of 800-850 DEG C, and ammonia dissociation gas protection is conducted; h, extrusion is conducted through a 880 ton extruding machine to obtain the required specification; i, rolling is conducted, a phi250 two-roll mill is adopted, and the thickness deformation quantity of a strip material is smaller than 80%; j, annealing is conducted, the temperature is 550-650 DEG C, ammonia dissociation gas protection is conducted for 1-2 hours; k, finish rolling is conducted, a phi60x240/250 four-roll mill is adopted, and the thickness deformation quantity of the strip material is smaller than 70%; and l, strip splitting is conducted to reach the required size of a precious metal layer of the silver copper composite strip material.
Description
Technical field
The present invention relates to a kind of preparation method of contact material, particularly relate to a kind of preparation method of silver-colored iron rhenium contact material.
Background technology
As everyone knows, electrical contact refers to and contacts with each other between two conductors, and realizes a kind of physics, the chemical phenomenon of current delivery or Signal transmissions by contact interface.Two conductors of delivered current or conveying signal are called contact or contact.Along with development that is scientific and technical and industrial automation, output and the kind of rly., contactor and switch increase by a wide margin, and thereupon, grow with each passing day to electrical contact quantity required and quality.
Electrical contact is the core parts of device for switching, affect the key factor of device for switching as the break-make transfer capabilities such as all kinds of air switch, rly., alternating current contactor and reliability, be widely used in all kinds of air switch, rly., the low voltage electrical apparatus industries such as AC/DC contactor, relate to the every field such as civilian, industrial, military, the space flight in modern society, aviation, information.Electrical contact is in use in open and close state frequently, therefore to electric contact material electrical property and mechanical property requirements very high, its salient features shows as: good conductivity; Good resistance fusion welding; Resistance to electrical wear is good; Contact resistance is low.
Domestic have GB/T5588-2002 " silver-colored nickel, silver-colored ferroelectric contacts Technology condition ", because silver-colored iron is immiscible, its preparation method adopts chemical codeposition, powder mixing machine or mechanical alloying, and obtained powder, by compacting, sintering, extruding and following process, can obtain required material.Silver iron alloy has good processing characteristics, and obtained material has many good qualities, and the little and contact resistance of resistivity is stablized, and has good anti-scorching, anti-melting welding and wear resistance, can under Different climate condition reliable operation.
And add the hardness that a small amount of rhenium metal can improve contact material, strengthen the anti-fusion welding property of contact material and wear resistance, increase the service life, be particularly useful in the alternating current contactor under the loading condiction that starting is frequent, disconnection times is more, heavier, this product is Siemens switch company customization research and development product, also be applicable to below 20A, in general rly., press button, can AgNi10 be replaced in some cases.
But, the fusing point of rhenium metal 3186 DEG C, the fusing point 1535 DEG C of iron, boiling point 2750, silver point 960 DEG C, boiling point 2213 DEG C, because the fusing point of rhenium is higher than iron and silver-colored boiling point, silver iron rhenium alloys can not be realized by melting technology, again because silver-colored iron is immiscible, so be difficult to produce silver-colored iron rhenium alloys, reach and add the hardness that a small amount of rhenium metal can improve contact material, strengthen the anti-fusion welding property of contact material and wear resistance, the object increased the service life.
Summary of the invention
The object of the invention is to provide a kind of preparation method that can realize a kind of silver-colored iron rhenium contact material of silver-colored iron rhenium material to overcome the deficiencies in the prior art.Its concrete grammar is as follows:
A, mixed powder: by 99.99% high-purity rehenic acid ammonium 7.6 mass parts and 99.95% carbonyl iron dust 92.4 mass parts, mix powder machine by V-type and carry out mixed powder, rotating speed 60-80 rev/min;
B, roasting: mixed powder at temperature 400-450 DEG C of Roasting Decomposition, its reaction formula:
2NH
4ReO
4→Re
2O
7+2NH
3↑+H
20↑
3Fe+2O
2→Fe
3O
4
C, reduction: ferric oxide and Fe forms rhenium mixed powder pass into hydrogen shield and reduce, and the time is 1-3 hour, obtain iron content 94.915% and rhenium-containing 5.085% iron rhenium alloys powder, its reaction formula:
Re
2O
7+7H
2→2Re+7H
20↑
Fe
3O
4+3H
2→3Fe+4H
20↑
D, ball milling, to sieve: after powder cooling, after ball mill grinding 12-24 hour, sieve 200 orders, stand-by;
E, mixed powder: by 320 object 99.99% silver powder and-200 object iron rhenium alloys powder, mix powder machine with plough shovel form and mix powder, the time is 1-3 hour, rotating speed 60 revs/min;
F, isostatic pressed: oily medium cold isostatic compaction, operating pressure 160-180MPa, dwell time 90-120 second, moulding stick ingot size Φ 90 × 400mm;
G, sintering: temperature 800-850 DEG C, ammonolysis craft gas shield;
H, extruding: 880 tons of extrusion machines, extrude required specification;
I, rolling: adopt Φ 250 two-roller mill, thickness of strip deflection is less than 80%;
J, annealing: temperature 550-650 DEG C, ammonolysis craft gas shield, time 1-2 hour;
K, finish rolling: adopt Φ 60 × 240/250 four-high mill, thickness of strip deflection is less than 70%;
L, itemize: point size that the layer of precious metal switching to silver-copper composite strip needs.
Said V-type is mixed powder machine and is carried out mixed powder, and its mixing time is 48-60 hour.
Said Roasting Decomposition, its time is 2-4 hour.
Said reduction, its temperature is 1000-1250 DEG C.
Said sintering, its time 3-5 hour.
As can be seen from technical scheme of the present invention, due to by first high-purity rehenic acid ammonium and carbonyl iron dust being carried out roasting, reduction obtains iron rhenium alloys powder, again silver powder and iron rhenium alloys powder are carried out mixed powder, static pressure, sintering, extruding, rolling, annealing, the techniques such as finish rolling define a kind of silver-colored iron rhenium contact material, thoroughly solve rhenium metal can not with iron, silver forms the technical difficulty of alloy, silver-colored iron rhenium alloys prepared by the present invention, overcome silver, iron, the shortcoming that rhenium three metal is immiscible, comparatively adopt silver powder, iron powder, the preparation method that rhenium powder directly mixes powder compares, rhenium particle is more evenly distributed in silver matrix, tiny, improve Drawing abillity and electrical contact performance.Fully meet the goal of the invention that the present invention can realize silver-colored iron rhenium material.
Embodiment
Embodiment 1, a kind of preparation method of silver-colored iron rhenium contact material.Its concrete grammar is as follows:
A, mixed powder: by 99.99% high-purity rehenic acid ammonium 7.6 mass parts and 99.95% carbonyl iron dust 92.4 mass parts, mix powder machine by V-type and carry out mixed powder 60 hours, rotating speed 60 revs/min;
B, roasting: mixed powder at temperature 400 DEG C of Roasting Decompositions, its reaction formula:
2NH
4ReO
4→Re
2O
7+2NH
3↑+H
20↑
3Fe+2O
2→Fe
3O
4
C, reduction: ferric oxide and Fe forms rhenium mixed powder pass into hydrogen shield and reduce, reduction temperature 1000 DEG C, and the time is 1 hour, obtain iron content 94.915% and rhenium-containing 5.085% iron rhenium alloys powder 70.05 mass parts, its reaction formula:
Re
2O
7+7H
2→2Re+7H
20↑
Fe
3O
4+3H
2→3Fe+4H
20↑
D, ball milling, to sieve: after powder cooling, with ball mill grinding after 18 hours, sieve 200 orders, stand-by;
E, mixed powder: by 320 object 99.99% silver powder and 200 object iron rhenium alloys powder, mix powder machine with plough shovel form and mix powder, the time is 1 hour, rotating speed 60 revs/min;
F, isostatic pressed: oily medium cold isostatic compaction, operating pressure 160MPa, 90 seconds dwell times, moulding stick ingot size Φ 90 × 400mm;
G, sintering: temperature 800 DEG C, ammonolysis craft gas shield;
H, extruding: 880 tons of extrusion machines, extrude required specification 40 × 6mm;
I, rolling: adopt Φ 250 two-roller mill, thickness of strip changes: 6.0-4.0-3.0-2.5mm;
J, annealing: temperature 550 DEG C, ammonolysis craft gas shield, 1 hour time;
K, finish rolling: adopt Φ 60 × 240/250 four-high mill, thickness of strip changes: 2.5-1.5-1.25-1.0mm;
L, itemize: it is for subsequent use as the layer of precious metal of silver-copper composite strip point to switch to 4.5 × 1.0mm.
Embodiment 2, a kind of preparation method of silver-colored iron rhenium contact material.Its concrete grammar is as follows:
A, mixed powder: by 99.95% carbonyl iron dust of 1.564 kilograms 99.99% high-purity rehenic acid ammonium and 18.983 kilograms, mix powder machine by V-type and carry out mixed powder 48 hours, rotating speed 80 revs/min;
B, roasting: mixed powder at temperature 450 DEG C of Roasting Decompositions, its reaction formula:
(NH
4)
2ReO
4→Re
2O
7+2NH
3↑+H
20↑
3Fe+2O
2→Fe
3O
4
C, reduction: ferric oxide and Fe forms rhenium mixed powder pass into hydrogen shield and reduce, and reduction temperature is 1250 DEG C, and the time is 3 hours, obtain iron content 94.915% and 20 kilograms, rhenium-containing 5.085% iron rhenium alloys powder, its reaction formula:
Re
2O
7+7H
2→2Re+7H
20↑
Fe
3O
4+3H
2→3Fe+4H
20↑
D, ball milling, to sieve: after powder cooling, with ball mill grinding after 24 hours, sieve-200 orders, stand-by;
E, mixed powder: by 320 object 99.99% silver powder and 200 object iron rhenium alloys powder, mix powder machine with plough shovel form and mix powder, the time is 3 hours, rotating speed 60 revs/min;
F, isostatic pressed: oily medium cold isostatic compaction, operating pressure 180MPa, 120 seconds dwell times, moulding stick ingot size Φ 90 × 400mm;
G, sintering: temperature 850 DEG C, ammonolysis craft gas shield;
H, extruding: 880 tons of extrusion machines, extrude required specification 40 × 6mm;
I, rolling: adopt Φ 250 two-roller mill, thickness of strip changes: 6-4-3-2.5mm;
J, annealing: temperature 650 DEG C, ammonolysis craft gas shield, time 2 h;
K, finish rolling: adopt Φ 60 × 240/250 four-high mill, thickness of strip changes: 2.5-1.5-1.25-1.0mm;
L, itemize: it is for subsequent use as the layer of precious metal of silver-copper composite strip point to switch to 4.5 × 1.0mm.
Claims (5)
1. a preparation method for silver-colored iron rhenium contact material, is characterized in that: concrete grammar is as follows
A () mixes powder: by 99.99% high-purity rehenic acid ammonium 7.6 mass parts and 99.95% carbonyl iron dust 92.4 mass parts, mix powder machine and carry out mixed powder, rotating speed 60-80 rev/min by V-type;
(b) roasting: mixed powder at temperature 400-450 DEG C of Roasting Decomposition, its reaction formula:
2NH
4ReO
4→Re
2O
7+2NH
3↑+H
20↑
3Fe+2O
2→Fe
3O
4
C () is reduced: ferric oxide and Fe forms rhenium mixed powder pass into hydrogen shield and reduce, and the time is 1-3 hour, obtain iron content 94.915% and rhenium-containing 5.085% iron rhenium alloys powder, its reaction formula:
Re
2O
7+7H
2→2Re+7H
20↑
Fe
3O
4+3H
2→3Fe+4H
20↑
(d) ball milling, to sieve: after powder cooling, after ball mill grinding 12-24 hour, sieve-200 orders, stand-by;
E () mixes powder: by 320 object 99.99% silver powder and-200 object iron rhenium alloys powder, mix powder machine with plough shovel form and mix powder, the time is 1-3 hour, rotating speed 60 revs/min;
(f) isostatic pressed: oily medium cold isostatic compaction, operating pressure 160-180MPa, dwell time 90-120 second, moulding stick ingot size Φ 90 × 400mm;
G () sinters: temperature 800-850 DEG C, ammonolysis craft gas shield;
H () extrudes: 880 tons of extrusion machines, extrudes required specification;
(i) rolling: adopt Φ 250 two-roller mill, thickness of strip deflection is less than 80%;
J () is annealed: temperature 550-650 DEG C, ammonolysis craft gas shield, time 1-2 hour;
(k) finish rolling: adopt Φ 60 × 240/250 four-high mill, thickness of strip deflection is less than 70%;
(l) itemize: point size that the layer of precious metal switching to silver-copper composite strip needs.
2. the preparation method of a kind of silver-colored iron rhenium contact material according to claim 1, it is characterized in that: said V-type is mixed powder machine and carried out mixed powder, its mixing time is 48-60 hour.
3. the preparation method of a kind of silver-colored iron rhenium contact material according to claim 1, it is characterized in that: said Roasting Decomposition, its time is 2-4 hour.
4. the preparation method of a kind of silver-colored iron rhenium contact material according to claim 1, it is characterized in that: said reduction, its temperature is 1000-1250 DEG C.
5. the preparation method of a kind of silver-colored iron rhenium contact material according to claim 1, is characterized in that: said sintering, its time 3-5 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510977497.7A CN105463235A (en) | 2015-12-23 | 2015-12-23 | Preparation method for silver-iron-rhenium electric contact material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510977497.7A CN105463235A (en) | 2015-12-23 | 2015-12-23 | Preparation method for silver-iron-rhenium electric contact material |
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|---|---|
| CN105463235A true CN105463235A (en) | 2016-04-06 |
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|---|---|---|---|
| CN201510977497.7A Pending CN105463235A (en) | 2015-12-23 | 2015-12-23 | Preparation method for silver-iron-rhenium electric contact material |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5494662A (en) * | 1978-01-06 | 1979-07-26 | Hitachi Ltd | Electric contact |
| JPS56119747A (en) * | 1980-02-25 | 1981-09-19 | Nippon Telegr & Teleph Corp <Ntt> | Electrical contact material and its manufacture |
| JPH0466641A (en) * | 1990-07-05 | 1992-03-03 | Sumitomo Metal Mining Co Ltd | Silver-oxide dispersion strengthened alloy and its manufacture |
| US5422065A (en) * | 1991-05-27 | 1995-06-06 | Siemens Aktiengesellschaft | Silver-based contact material for use in power-engineering switchgear, and a method of manufacturing contacts made of this material |
| CN1161380A (en) * | 1996-02-27 | 1997-10-08 | 德古萨股份公司 | Sticked Ag-Fe electric contact material, and method for preparing same |
| CN101054654A (en) * | 2006-04-11 | 2007-10-17 | 中国科学院金属研究所 | High-strength high-conductivity oxidation-resisting low-silver copper-base alloy and preparation thereof |
| CN104112608A (en) * | 2014-07-21 | 2014-10-22 | 南通万德科技有限公司 | Switch contact with refractory metal alloy coating layer and preparation method thereof |
| CN104112609A (en) * | 2014-07-21 | 2014-10-22 | 南通万德科技有限公司 | Arc ablation resistance switch contact and production method thereof |
-
2015
- 2015-12-23 CN CN201510977497.7A patent/CN105463235A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5494662A (en) * | 1978-01-06 | 1979-07-26 | Hitachi Ltd | Electric contact |
| JPS56119747A (en) * | 1980-02-25 | 1981-09-19 | Nippon Telegr & Teleph Corp <Ntt> | Electrical contact material and its manufacture |
| JPH0466641A (en) * | 1990-07-05 | 1992-03-03 | Sumitomo Metal Mining Co Ltd | Silver-oxide dispersion strengthened alloy and its manufacture |
| US5422065A (en) * | 1991-05-27 | 1995-06-06 | Siemens Aktiengesellschaft | Silver-based contact material for use in power-engineering switchgear, and a method of manufacturing contacts made of this material |
| CN1161380A (en) * | 1996-02-27 | 1997-10-08 | 德古萨股份公司 | Sticked Ag-Fe electric contact material, and method for preparing same |
| CN101054654A (en) * | 2006-04-11 | 2007-10-17 | 中国科学院金属研究所 | High-strength high-conductivity oxidation-resisting low-silver copper-base alloy and preparation thereof |
| CN104112608A (en) * | 2014-07-21 | 2014-10-22 | 南通万德科技有限公司 | Switch contact with refractory metal alloy coating layer and preparation method thereof |
| CN104112609A (en) * | 2014-07-21 | 2014-10-22 | 南通万德科技有限公司 | Arc ablation resistance switch contact and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 吴王平，江鹏，华同曙: ""难熔金属铼及其合金的研究进展"", 《金属功能材料》 * |
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Application publication date: 20160406 |
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