WO2019072240A1 - Procédé de préparation d'un matériau superfin de contact électrique en argent-tungstène à dispersion élevée - Google Patents

Procédé de préparation d'un matériau superfin de contact électrique en argent-tungstène à dispersion élevée Download PDF

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Publication number
WO2019072240A1
WO2019072240A1 PCT/CN2018/110061 CN2018110061W WO2019072240A1 WO 2019072240 A1 WO2019072240 A1 WO 2019072240A1 CN 2018110061 W CN2018110061 W CN 2018110061W WO 2019072240 A1 WO2019072240 A1 WO 2019072240A1
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WIPO (PCT)
Prior art keywords
silver
tungsten
powder
skeleton
electrical contact
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Application number
PCT/CN2018/110061
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English (en)
Chinese (zh)
Inventor
张秀芳
万岱
王珩
杨昌麟
李�杰
颜小芳
黄文明
黄钟
柏小平
林万焕
Original Assignee
福达合金材料股份有限公司
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Publication of WO2019072240A1 publication Critical patent/WO2019072240A1/fr

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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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/09—Mixtures of metallic powders
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1035—Liquid phase sintering
    • 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
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the invention belongs to the field of electrical contact materials, and specifically relates to a preparation method of ultra-fine high-dispersion silver-tungsten electrical contact materials.
  • Arc burnout is essentially the heat-force effect of arc energy on the contact material, and physical metallurgical processes such as heating, melting, gasification, flow, solidification, etc. occur on the contact surface, resulting in softening, splashing, and flow on the contact surface. , cracks and other phenomena. Improving the electrical performance of the contacts requires materials to be optimally designed and prepared through the components and tissues to delay or mitigate the occurrence of the above physical metallurgical processes.
  • the traditional silver-tungsten electrical contact material has a phenomenon of tungsten agglomeration in the structure, and the silver cannot completely penetrate into the hole.
  • the aggregation and pores inside the material structure are often crack propagation channels due to the poor bonding strength.
  • the material is accelerated under the action of the heat of the arc. Therefore, it is necessary to prepare a silver-tungsten electrical contact material with uniform dispersion of tissue.
  • Patent CN104209520 discloses a method for manufacturing an electrical contact, which adopts a liquid pore-forming agent to improve the infiltration property of the skeleton, and improves the closed pore caused by the solid powder being unable to isolate the skeleton powder from each other, but is still uniform between the solid tungsten powder particles.
  • the process cannot further refine the structure, and a single tungsten powder particle can still be regarded as a local "tungsten aggregation" phenomenon.
  • Patent CN105779804 A foam skeleton structure reinforced metal matrix composite material and a preparation method thereof, the surface of the foam skeleton is strengthened with a layer of high thermal conductive material, and the foam skeleton is composited with the metal matrix by pressure infiltration technology.
  • the high-heat-conducting particles, super-hard wear-resistant particles and conductive particles composed of different orientations are formed in the foam skeleton through various complicated processes to achieve the purpose of maximizing the heat conduction effect of the composite material.
  • the foam metal skeleton structure in the patent mainly serves as a structural member of the support layer of the reinforcing layer, and its function is equivalent to the foam ceramic skeleton; the internal pore diameter is coarse, and the functional effect of the ultrafine dispersion structure cannot be obtained.
  • None of the above inventions relates to a method for preparing an ultrafine high-dispersion silver-tungsten electrical contact material having high and stable arc burning resistance.
  • the technical problem to be solved by the embodiments of the present invention is to provide a method for preparing an ultrafine high-dispersion silver-tungsten electrical contact material having high and stable arc-burning resistance.
  • the technical solution of the present invention includes the following steps:
  • the skeleton is subjected to skeleton exhaust in a vacuum sintering furnace under an atmosphere of 50-120 Pa at 600-800 ° C for 2-4 hours; the skeleton prepared by the foamed tungsten powder in this step is pre-burned and exhausted in a vacuum atmosphere, which is favorable for reducing Capillary resistance during infiltration, forming a dense electrical contact material;
  • the foamed tungsten powder is 0.5-6 um spherical porous tungsten powder, and the pore form thereof is a network-like structure, the pore diameter is 0.01-5 um, and the porosity is 50%-99.9%.
  • the activation element is one or a combination of Be, Al, Ti, Ta, Nb, Ni-P, Li.
  • the innovative mechanism of the invention is:
  • the technical scheme of the invention adopts spherical foamed tungsten powder with a large amount of interconnected pores inside the particle as a skeleton powder raw material, and pre-burns and exhausts the skeleton in a vacuum atmosphere to reduce capillary capillary resistance during infiltration; and simultaneously added in the system
  • the activating element promotes the dissolution of tungsten in the silver and forms a high-diffusing interfacial mesophase of the activating element and tungsten, which facilitates the penetration of silver into the pores of the framework powder and the formation of a dense electrical contact material.
  • the beneficial effects of the invention are: in the prepared silver-tungsten electrical contact material, silver can not only form a network of connections between the tungsten particles, but also penetrate into the inner pores of the tungsten particles to form an integral network with the outside, and maintain The continuity of each phase. Due to the high energy density, short-term and random characteristics of the arc, the phase change of the contact material in the arc erosion process is complicated. In an ultra-fine and high-dispersion distribution system, tungsten distribution is uniform and effectively resists arc heat-force action, reducing silver melting, gasification and splashing; uniformity of silver distribution effectively improves contact conductivity, reduces body resistance, and conducts electricity quickly. Thermal conductivity. During the two-phase interaction, the composition and morphology of the micro-areas on the contact surface of the arc erosion process are small, which shows high and reliable arc burning performance.
  • FIG. 1 is a SEM comparison diagram of the first embodiment of the present invention, and the left diagram of FIG. 1 is a conventional process, and the right drawing process of the present application;
  • FIG. 2 is a SEM comparison diagram of the second embodiment of the present invention, and the left diagram of FIG. 1 is a conventional process, and the right drawing process of the present application;
  • FIG. 3 is a SEM comparison diagram of the third embodiment of the present invention, and the left diagram of FIG. 1 is a conventional process, and the right drawing process of the present application.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the spherical foamed tungsten powder and the activating element (Be, Ti, Nb) are premixed for 2 hours at a ratio of 99.3:0.2:0.3:0.2; the spherical foamed tungsten powder has a particle size of 2 um, a pore diameter of 0.1-0.5 um, and a porosity of 90. %;
  • the skeleton is subjected to skeleton exhaust in a vacuum sintering furnace under a vacuum atmosphere of 100 Pa at 800 ° C for 2 hours;
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the skeleton is subjected to skeleton exhaust in a vacuum sintering furnace under a vacuum atmosphere of 80 Pa at 750 ° C for 1.5 hours;
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • spherical foamed tungsten powder pre-mixing spherical foamed tungsten powder with activating elements (Al, Li, Nb) at a ratio of 99.5:0.1:0.3:0.1; spherical foamed tungsten powder having a particle size of 3 umn, a pore diameter of 0.2-0.6 um, and a porosity of 95 %;
  • the skeleton is subjected to skeleton exhaust in a vacuum sintering furnace under a vacuum atmosphere of 50 Pa at 700 ° C for 4 hours;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Contacts (AREA)

Abstract

La présente invention concerne un procédé de préparation d'un matériau superfin de contact électrique en argent-tungstène à dispersion élevée, le procédé comprenant: le prémélange d'une poudre de tungstène de mousse sphérique et d'un élément activé, un mélange avec une partie de poudre d'argent pour préparer une poudre de structure de base, la formation d'une structure de base ayant une certaine porosité au moyen d'une pression initiale, la réalisation d'un frittage sous vide, et la réalisation d'une infiltration d'argent pour obtenir un alliage d'argent-tungstène à dispersion élevée, compact et superfin. Dans le matériau de contact électrique en argent-tungstène à uniformité élevée préparé au moyen du procédé de l'invention, les grains des deux phases d'argent de base et de tungstène à point de fusion élevé sont fins et sont répartis de manière interactive et dispersée, tandis que les composants et la morphologie à l'intérieur de chaque plage de micro-zones d'une surface de contact changent légèrement lors d'un procédé d'érosion à l'arc, ce qui représente une performance de combustion à l'arc élevée et fiable. Le procédé est simple et approprié pour une production en masse, et le produit préparé peut être largement utilisé dans des disjoncteurs et des contacteurs.
PCT/CN2018/110061 2017-10-13 2018-10-12 Procédé de préparation d'un matériau superfin de contact électrique en argent-tungstène à dispersion élevée WO2019072240A1 (fr)

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CN201710953299.6A CN107794399B (zh) 2017-10-13 2017-10-13 一种超细高弥散银钨电接触材料的制备方法
CN201710953299.6 2017-10-13

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Cited By (4)

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CN114657481A (zh) * 2022-03-08 2022-06-24 厦门欧斯拓科技有限公司 一种稀土复合材料的制备方法
CN115360032A (zh) * 2022-08-30 2022-11-18 中国南方电网有限责任公司超高压输电公司检修试验中心 铜钨触头及其制备方法和应用
CN115927900A (zh) * 2022-11-17 2023-04-07 东北大学 一种Ag-Ti3SiC2电接触材料的组分调控方法
CN116904787A (zh) * 2023-07-14 2023-10-20 苏州市希尔孚新材料股份有限公司 一种节银高性能银碳化钨镍触头的制备方法

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CN107794399B (zh) * 2017-10-13 2022-03-15 浙江福达合金材料科技有限公司 一种超细高弥散银钨电接触材料的制备方法
CN109261974B (zh) * 2018-08-23 2021-02-19 长沙升华微电子材料有限公司 一种多元假合金复合材料及其制备方法和应用
CN110614381B (zh) * 2019-08-06 2022-09-23 温州聚星电接触科技有限公司 银基石墨烯电接触材料的制备方法及其电接触材料
CN111041546B (zh) * 2019-12-07 2021-06-01 福达合金材料股份有限公司 一种表面具有连续银层的银钨电触头的制作方法及其产品
CN114724871A (zh) * 2022-03-28 2022-07-08 中国科学院金属研究所 一种银-Ti3SiC2电接触材料及其制备方法

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114657481A (zh) * 2022-03-08 2022-06-24 厦门欧斯拓科技有限公司 一种稀土复合材料的制备方法
CN115360032A (zh) * 2022-08-30 2022-11-18 中国南方电网有限责任公司超高压输电公司检修试验中心 铜钨触头及其制备方法和应用
CN115360032B (zh) * 2022-08-30 2024-05-28 中国南方电网有限责任公司超高压输电公司检修试验中心 铜钨触头及其制备方法和应用
CN115927900A (zh) * 2022-11-17 2023-04-07 东北大学 一种Ag-Ti3SiC2电接触材料的组分调控方法
CN115927900B (zh) * 2022-11-17 2024-06-07 东北大学 一种Ag-Ti3SiC2电接触材料的组分调控方法
CN116904787A (zh) * 2023-07-14 2023-10-20 苏州市希尔孚新材料股份有限公司 一种节银高性能银碳化钨镍触头的制备方法
CN116904787B (zh) * 2023-07-14 2024-03-19 苏州市希尔孚新材料股份有限公司 一种节银高性能银碳化钨镍触头的制备方法

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