CN110467480A - A kind of silver-dipping graphite contact material and preparation method thereof - Google Patents

A kind of silver-dipping graphite contact material and preparation method thereof Download PDF

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Publication number
CN110467480A
CN110467480A CN201910823177.4A CN201910823177A CN110467480A CN 110467480 A CN110467480 A CN 110467480A CN 201910823177 A CN201910823177 A CN 201910823177A CN 110467480 A CN110467480 A CN 110467480A
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graphite
silver
preparation
dipping
powder
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朱振国
于冬
白朔
徐红军
成会明
杜海峰
王硕
罗川
张继江
石建祥
王进忠
刘炜
吕树远
潘镜竹
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Institute of Metal Research of CAS
Shenyang Railway Signal Co Ltd
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Institute of Metal Research of CAS
Shenyang Railway Signal Co Ltd
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Priority to CN201910823177.4A priority Critical patent/CN110467480A/en
Publication of CN110467480A publication Critical patent/CN110467480A/en
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    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/51—Metallising, e.g. infiltration of sintered ceramic preforms with molten metal
    • C04B41/5116—Ag or Au
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    • C04B41/85—Coating or impregnation with inorganic materials
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/023—Composite material having a noble metal as the basic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes
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    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
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Abstract

The present invention relates to carbon graphite composite material field, specially a kind of relay silver-dipping graphite contact material and preparation method thereof.Density of material is 4.8 ± 0.3g/cm3, chemical component Ag content 70% ± 5%, remaining is C.Preparation method is the following steps are included: prepared by (1) graphite matrix: first by crystalline graphite powder, pitch rubber powder, carbon black and coal tar pitch kneading, compression moulding；Using roasting, graphitization processing prepares graphite matrix；(2) contracted payment is cast: graphite matrix being put into graphite jig, and uses corresponding positioning mechanism, casts in intermediate frequency furnace, is uniformly coated on metallic silver around graphite matrix.(3) thermal isostatic pressing silver leaching: the silver-colored packet graphite ingot of preparation is put into hot isostatic press, silver is soaked at the temperature, pressure of setting, and heat-insulation pressure keeping is carried out, silver-dipping graphite contact material is prepared, has the advantages that intensity height, good conductivity, long service life, resistance to ablation, anti-melting welding are good.

Description

A kind of silver-dipping graphite contact material and preparation method thereof
Technical field
The present invention relates to carbon graphite composite material field, specially a kind of relay silver-dipping graphite contact material and its system Preparation Method.
Background technique
Currently, electrical contact material used in electrical apparatus industry is largely based on silver-based material, domestic application is most wide, yield Maximum electrical contact material is AgCdO, but since cadmium metal is heavy metal, has toxicity, is used in material preparation and contact It is volatile in the process, cause environmental pollution.
In order to reduce pollution, the electrical contact material research of Ag-C series is more and more, and powder is usually used in the current country Metallurgical method prepares silver-graphite electrical contact, such as: Chinese patent (publication number CN105506342A and CN105551859A) utilizes stone Ink powder and carbonic acid silver powder are mixed, compression moulding in a mold, the processes such as are then fired, are sintered and obtaining silver-colored graphite base Ingot, further processing obtains silver-colored graphite contact material.The silver-colored graphite contact material content of graphite of invention preparation only has 1~ 6wt%, since metallic silver and graphite particle in the nonwetting material of graphite are easy to fall off, which holds in use It is also easy to produce electric arc, the risk with melting welding.Therefore, urgent need develops novel silver-colored graphite contact material and makes up above-mentioned material not Foot.
Summary of the invention
The purpose of the present invention is to provide a kind of silver-dipping graphite contact materials and preparation method thereof, soak silver using graphite matrix And electrical contact material is prepared, it is able to satisfy the requirement of high-end electric equipment products.
The technical scheme is that
A kind of silver-dipping graphite contact material soaks silver using graphite matrix and obtains, and density of material is 4.8 ± 0.3g/cm3, change A point Ag content 70wt% ± 5wt% is studied, remaining is C.
The preparation method of the silver-dipping graphite contact material, comprising the following steps:
(1) prepared by graphite matrix
Firstly, using crystalline graphite powder, pitch rubber powder, carbon black as raw material, coal tar pitch is binder, by crystalline graphite powder, drip Green rubber powder, carbon black and coal tar pitch kneading are uniform, by weight, crystalline graphite powder: pitch rubber powder: carbon black=50~60:35~ 45:3~10, coal tar pitch account for the 30%~40% of raw material and binder total weight, compression moulding；It is roasted using 850 DEG C~950 DEG C It burns, finally the graphitization processing under 2850 DEG C ± 50, prepares graphite matrix；
(2) contracted payment is cast
Graphite matrix is put into graphite jig, and uses corresponding positioning mechanism, is cast in intermediate frequency furnace, It is uniformly coated on metallic silver around graphite matrix；
(3) thermal isostatic pressing silver leaching
The silver-colored packet graphite ingot of preparation is put into hot isostatic press, silver is soaked at the temperature, pressure of setting, and kept the temperature Pressure maintaining, then cools to room temperature with the furnace, and processing obtains silver-dipping graphite contact material.
The preparation method of the silver-dipping graphite contact material, the granularity of crystalline graphite powder, pitch rubber powder and carbon black are 30 ~50 microns.
The preparation method of the silver-dipping graphite contact material, hip temperature are 1100 DEG C~1260 DEG C, and pressure is 50~100MPa, heat-insulation pressure keeping time are 0.5~2 hour.
Mentality of designing of the invention is:
The present invention designs graphite matrix ingredient and granularity first, prepares graphite-based with traditional carbon graphite material preparation process Body.Using advanced thermal isostatic pressing silver leaching process, molten metal silver can be big in filled graphite matrix at high temperature under high pressure Part hole, to prepare silver-dipping graphite contact material.
It advantages of the present invention and has the beneficial effect that:
The present invention proposes that preparing silver-dipping graphite contact material density is 4.8 ± 0.3g/cm using graphite matrix leaching silver3, change A point Ag content 70wt% ± 5wt% is studied, remaining is C.The present invention by the good electric conductivity of metallic silver and the resistance to scaling loss of graphite, go out The performances such as arc organically combine, and be prepared it is good etc. with intensity height, good conductivity, long service life, resistance to ablation, anti-melting welding The silver-dipping graphite contact material of advantage.
Detailed description of the invention
Fig. 1 is the metallographic structure (200 ×) of silver-dipping graphite contact material prepared by the embodiment of the present invention 1.
Specific embodiment
In the specific implementation process, the present invention provides a kind of silver-dipping graphite contact material and preparation method thereof, including following Step: (1) prepared by graphite matrix: first by crystalline graphite powder, pitch rubber powder, carbon black and coal tar pitch kneading, compression moulding；It passes through again Roasting is crossed, graphitization processing prepares graphite matrix；(2) contracted payment is cast: graphite matrix being put into graphite jig, and uses phase The positioning mechanism answered casts in 100KW intermediate frequency furnace, is uniformly coated on metallic silver around graphite matrix. (3) thermal isostatic pressing silver leaching: the silver-colored packet graphite ingot of preparation is put into hot isostatic press, and silver is soaked at the temperature, pressure of setting, and Certain time heat-insulation pressure keeping is carried out, silver-dipping graphite contact material is prepared.In the present invention, pitch rubber powder is that coal tar pitch passes through After calcining molding, then it is crushed, is ground up, sieved and prepares.
Below in conjunction with specific embodiment, the invention will be further elaborated, content to better understand the invention, But the present invention is not limited to following embodiments.
Embodiment 1
In the present embodiment, using crystalline graphite powder, pitch rubber powder, carbon black as raw material, coal tar pitch is binder, crystalline flake graphite The granularity of powder, pitch rubber powder and carbon black is 40 microns.By weight, crystalline graphite powder: pitch rubber powder: carbon black=50:45:5, Coal tar pitch accounts for the 35% of raw material and binder total weight, and kneading uniformly simultaneously compression moulding is roasted at 900 DEG C, then at 2800 DEG C Graphitization processing, obtaining density is 1.31g/cm3Graphite matrix.Graphite matrix is put into graphite jig, and using corresponding Positioning mechanism, cast in 100KW intermediate frequency furnace, be uniformly coated on metallic silver around graphite matrix, put Enter and soak silver in hot isostatic press at 1110 DEG C of temperature, 60MPa, time 2 h, power failure is stopped the supple of gas or steam, and cools to room temperature with the furnace.Preparation Silver-dipping graphite contact performance index be shown in Table 1.
Table 1
Project name Density (g/cm3) Silver content (Wt%) Compression strength (MPa) Resistivity (10-7Ω·m)
Embodiment 1 4.68 71 102 1.97
As shown in Figure 1, the metallographic structure (200 ×) of the silver-dipping graphite contact material prepared from embodiment 1 is as can be seen that warp After crossing thermal isostatic pressing silver leaching, metallic silver is filled with most of hole of graphite matrix, forms network-like connectivity structure, not only improves The intensity of graphite matrix, and composite material resistance rate is substantially reduced, to realize intensity height, good conductivity, service life The good advantage of long, resistance to ablation, anti-melting welding.
Embodiment 2
In the present embodiment, using crystalline graphite powder, pitch rubber powder, carbon black as raw material, coal tar pitch is binder, crystalline flake graphite The granularity of powder, pitch rubber powder and carbon black is 35 microns.By weight, crystalline graphite powder: pitch rubber powder: carbon black=60:36:4, Coal tar pitch accounts for the 40% of raw material and binder total weight, and kneading uniformly simultaneously compression moulding is roasted at 850 DEG C, then at 2850 DEG C Graphitization processing, obtaining density is 1.28g/cm3Graphite matrix.Graphite matrix is put into graphite jig, and using corresponding Positioning mechanism, cast in 100KW intermediate frequency furnace, be uniformly coated on metallic silver around graphite matrix, put Enter and soak silver in hot isostatic press at 1260 DEG C of temperature, 90MPa, the time 0.5 hour, power failure was stopped the supple of gas or steam, and cools to room temperature with the furnace.System Standby silver-dipping graphite contact performance index is shown in Table 2.
Table 2
Project name Density (g/cm3) Silver content (Wt%) Compression strength (MPa) Resistivity (10-7Ω·m)
Embodiment 2 5.05 74 116 1.32
Embodiment 3
In the present embodiment, using crystalline graphite powder, pitch rubber powder, carbon black as raw material, coal tar pitch is binder, crystalline flake graphite The granularity of powder, pitch rubber powder and carbon black is 45 microns.By weight, crystalline graphite powder: pitch rubber powder: carbon black=55:36:9, Coal tar pitch accounts for the 32% of raw material and binder total weight, and kneading uniformly simultaneously compression moulding is roasted at 950 DEG C, then at 2800 DEG C Graphitization processing, obtaining density is 1.30g/cm3Graphite matrix.Graphite matrix is put into graphite jig, and using corresponding Positioning mechanism, cast in 100KW intermediate frequency furnace, be uniformly coated on metallic silver around graphite matrix, put Enter and soak silver in hot isostatic press at 1200 DEG C of temperature, 80MPa, the time 1 hour, power failure was stopped the supple of gas or steam, and cools to room temperature with the furnace.Preparation Silver-dipping graphite contact performance index be shown in Table 3.
Table 3
Project name Density (g/cm3) Silver content (Wt%) Compression strength (MPa) Resistivity (10-7Ω·m)
Embodiment 3 4.85 73 108 1.65

Claims (4)

1. a kind of silver-dipping graphite contact material, which is characterized in that using graphite matrix soak silver obtain, density of material be 4.8 ± 0.3g/cm3, chemical component Ag content 70wt% ± 5wt%, remaining is C.
2. a kind of preparation method of silver-dipping graphite contact material described in claim 1, which comprises the following steps:
(1) prepared by graphite matrix
Firstly, using crystalline graphite powder, pitch rubber powder, carbon black as raw material, coal tar pitch is binder, by crystalline graphite powder, asphalt adhesive Powder, carbon black and coal tar pitch kneading are uniform, by weight, crystalline graphite powder: pitch rubber powder: carbon black=50~60:35~45:3 ~10, coal tar pitch accounts for the 30%~40% of raw material and binder total weight, compression moulding；It is roasted using 850 DEG C~950 DEG C, The finally graphitization processing under 2850 DEG C ± 50, prepares graphite matrix；
(2) contracted payment is cast
Graphite matrix is put into graphite jig, and uses corresponding positioning mechanism, casts in intermediate frequency furnace, makes gold Belong to silver to be uniformly coated on around graphite matrix；
(3) thermal isostatic pressing silver leaching
The silver-colored packet graphite ingot of preparation is put into hot isostatic press, silver is soaked at the temperature, pressure of setting, and carry out heat preservation guarantor Pressure, then cools to room temperature with the furnace, and processing obtains silver-dipping graphite contact material.
3. the preparation method of silver-dipping graphite contact material according to claim 2, which is characterized in that crystalline graphite powder, drip The granularity of green rubber powder and carbon black is 30~50 microns.
4. the preparation method of silver-dipping graphite contact material according to claim 2, which is characterized in that hip temperature is 1100 DEG C~1260 DEG C, pressure is 50~100MPa, and the heat-insulation pressure keeping time is 0.5~2 hour.
CN201910823177.4A 2019-09-02 2019-09-02 A kind of silver-dipping graphite contact material and preparation method thereof Pending CN110467480A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111218581A (en) * 2020-02-24 2020-06-02 昆明贵金属研究所 High-density high-strength silver-carbon composite electric contact material and preparation method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1471436A1 (en) * 1963-03-18 1969-03-13 Lorraine Carbone Process for impregnating bodies made of carbon or graphite with molten metals
CN101450871A (en) * 2007-12-07 2009-06-10 中国科学院金属研究所 Carbon graphite thermal isostatic pressing silver leaching process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1471436A1 (en) * 1963-03-18 1969-03-13 Lorraine Carbone Process for impregnating bodies made of carbon or graphite with molten metals
CN101450871A (en) * 2007-12-07 2009-06-10 中国科学院金属研究所 Carbon graphite thermal isostatic pressing silver leaching process

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周序科: "浸银石墨电刷的显微组织结构与摩擦磨损的研究", 《新型炭材料》 *
孟献梁等: "《煤炭加工利用概论》", 31 January 2018 *
徐红军: "浸银对炭材料的改性作用", 《炭素技术》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111218581A (en) * 2020-02-24 2020-06-02 昆明贵金属研究所 High-density high-strength silver-carbon composite electric contact material and preparation method thereof

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