A preparation method of a rapid bonding of a long silver-graphite electrical contact material and a solder strip material includes the following steps: first step, making a silver-graphite spindle into a silver-graphite electrical contact sheet material by an extrusion process; second step, performing a sintering to composite a solder strip material with the silver-graphite electrical contact sheet material to obtain a composite blank; and third step, performing a rolling and a heat treatment on the composite blank for one or more times to complete the composite of the long silver-graphite electrical contact material and the solder strip material. The method is a method for preparing a silver-based electrical contact material and solder composite material.
H01R 43/04 - Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
A method for preparing an alternating arrangement silver-copper lateral composite ingot, including: using a concave roller set; manufacturing a copper frame having a fixed width according to a negative tolerance of a width of the grooves of the concave roller, and corresponding copper bars and silver bars, and performing a surface treatment on the copper frame, the copper bars, and the silver bars; and then arranging different number of copper bars and silver bars at internals as needed and tightly placing into the copper frame to form a composite blank, i.e., a composite ingot. A method for preparing an alternating arrangement silver-copper lateral composite strip is further provided, and the silver-copper lateral composite ingot prepared by the method for preparing the alternating arrangement silver-copper lateral composite ingot is used to prepare the silver-copper lateral composite strip.
B21B 3/00 - Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences
C22F 1/02 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
C22F 1/08 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
C22F 1/14 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon
3.
METHOD FOR PREPARING PENETRATING-TYPE SILVER-COPPER COMPOSITE INGOT AND STRIP
A method for preparing a penetrating-type silver-copper composite ingot, comprising: using a group of irregularly shaped rolls, the irregularly shaped rolls being a pair of working rolls (2, 3) in a roll system of a four-roll solid-phase composite rolling mill, and grooves (5) being provided at the central positions of the working rolls; manufacturing a copper frame having a fixed width and corresponding copper bars and silver bars according to a negative tolerance of the width of the grooves of the irregularly shaped rolls, and carrying out surface treatment on the copper frame, the copper bars, and the silver bars; alternately and tightly placing different quantities of copper bars and silver bars into the copper frame according to requirements to form a composite blank, i.e., a composite ingot. The present invention also relates to a method for preparing a penetrating-type silver-copper composite strip. The silver-copper composite strip is manufactured by processing the silver-copper composite ingot prepared by the method for preparing a penetrating-type silver-copper composite ingot. The composite ingot manufactured using a penetrating-type method features a simple structure and is easy to splice, such that the subsequent processing technology is optimized and the production period is shortened. By means of the improvement on the roll system of the solid-phase composite rolling mill, the bonding strength of silver and copper side composite strips is effectively improved.
B21B 1/38 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets
H01H 85/04 - Fuses, i.e. expendable parts of the protective device, e.g. cartridges
4.
FAST COMPOUNDING PREPARATION METHOD FOR LONG STRIPED SILVER-GRAPHITE ELECTRICAL CONTACT MATERIAL AND SOLDER TAPE
A fast compounding preparation method for a long striped silver-graphite electrical contact material and a solder tape, comprising the following steps: a first step, using an extrusion process to prepare silver-graphite spindles into a silver-graphite electrical contact sheet; a second step, sintering and compounding a solder tape and the silver-graphite electrical contact sheet to obtain a composite blank; and a third step, subjecting the composite blank to rolling and heat treatment for one or more times, so as to complete the compounding of the long striped silver-graphite electrical contact material with the solder tape. Efficient and fast compounding of a long striped silver-graphite electric contact sheet and a solder tape can be realized, a product having good interface bonding quality and high product size accuracy can be produced, and continuity and short flow can be realized, facilitating to achieve automated welding.
Disclosed is a method for preparing an elastic electrical contact composite material. The preparation method comprises: compounding and rolling a stainless steel strip and a Cu strip to prepare a stainless steel (1)/Cu (2) two-layer or stainless steel (1)/Cu (2)/stainless steel (1) three-layer composite strip; performing diffusion heat treatment on the stainless steel (1)/Cu (2) two-layer or stainless steel (1)/Cu (2)/stainless steel (1) three-layer composite strip; performing cyclic treatment on the heat-treated composite strip multiple times; withdrawing and straightening the heat-treated composite material strip; cleaning the withdrawn and straightened composite strip in phases and then slitting same; and punching the slitted composite strip to obtain the desired elastic electrical contact material. With the preparation method by combining phased heat treatment and multiple cyclic treatments, an environment-friendly elastic electrical contact composite material with a high strength, a high elasticity and a low resistivity can be prepared; and the process is simple, the cost is low, and there is no special requirement for a device.
B32B 15/01 - Layered products essentially comprising metal all layers being exclusively metallic
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
B21B 1/38 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets
A preparation method of an electrical contact material includes steps of: adopting chemical plating to cover nickel coating on aquadag or metallic oxide, then covering with silver coating, and forming Ag—Ni—C or Ag—Ni—MeO core-shell structure, which improves interface wettability of aquadag, metallic oxide and silver matrix, and removes the adverse effect on the electrical contact material mechanical property due to bad interface wettability in conventional powder metallurgy method. What is important is that the silver in intermediate composite particles is replaced by nickel coating, thus reduce the silver use level. The main function of silver coating is to improve inoxidizability of composite particles, sintering granulation property and the deformability during the manufacturing process of intermediate composite particles, thus improve the technological property.
H01H 1/023 - Composite material having a noble metal as the basic material
B22F 1/02 - Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition comprising coating of the powder
B22F 3/20 - Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor by extruding
C22C 32/00 - Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
B22F 3/24 - After-treatment of workpieces or articles
C23C 18/32 - Coating with one of iron, cobalt or nickel; Coating with mixtures of phosphorus or boron with one of these metals
A preparation method for electrical contact materials comprises the steps: coating colloidal graphite or metallic oxides with a layer of nickel by chemical plating, and then coating with silver so as to form an Ag-Ni-C or Ag-Ni-MeO core-shell structure. Wettability of the interfaces between the colloidal graphite or the metallic oxides and the silver substrate are improved, and adverse impacts on mechanical properties of the electrical contact materials caused by poor wettability of interfaces in conventional powder metallurgy methods are eliminated. More importantly, the silver of intermediate composite particles is replaced by coating with metal nickel; thereby the consumption of silver is reduced. Main roles of coating with silver are improving oxidation resistance of composite particles, sintering and granulation performances, and deformability of the intermediate composite particles in working, thereby improving processing properties.
A method for preparing silver-based electrical contact materials with fiber-like arrangement of reinforcing nanoparticles includes (1) uniformly mixing reinforcement powders and silver matrix powders for ball milling; (2) pouring the obtained composite powders and silver matrix powders into a powder mixing machine for powder mixing; (3) cold isostatic pressing; (4) sintering; (5) hot pressing; and (6) hot extruding to obtain silver-based electrical contact materials with fiber-like arrangement of reinforcing nanoparticles. The method of the present invention can obtain silver-based electrical contact materials with fiber-like arrangement of reinforcing nanoparticles with no specific requirement on processing deformation, and the plasticity and ductility of the reinforcing phase. Furthermore, it has simple processes, low cost and no particular requirements on the equipment. Contact materials prepared by the present method have good resistance to welding and arc erosion, conductivity and a greatly enhanced processing performance.
H01B 1/02 - Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
C23C 30/00 - Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
9.
Method of preparing silver-based electrical contact materials with directionally arranged reinforcing particles
A method of preparing silver-based electrical contact materials with directionally arranged reinforcing particles includes steps of: (1) preparing composite powders with Ag coating on the reinforcing phase by chemical plating coating; (2) granulating; (3) placing the granulated powders and the matrix silver powders into the powder mixer for mixing; (4) cold-isostatically pressing; (5) sintering; (6) hot-presssing; (7) hot-extruding, thereby obtaining the reinforcing silver-based electrical contact materials with directionally arranged particles. Regardless of the size of reinforcing particles, the present invention can obtain particle-reinforced silver-based materials with excellent electrical performance. The process is simple and easy to operate, and places no special requirements on the equipment. Furthermore, the resistance to welding and arc erosion, and the conductivity of the material prepared by the present invention can be greatly improved. Moreover, the processing performance is excellent.
H01R 43/16 - Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending
B22F 1/02 - Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition comprising coating of the powder
B22F 3/16 - Both compacting and sintering in successive or repeated steps
B22F 3/20 - Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor by extruding
B22F 9/24 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
H01B 1/02 - Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
10.
Method of preparing Ag-based oxide contact materials with directionally arranged reinforcing particles
In the present invention, a method of preparing Ag-based oxide contact materials with directionally arranged reinforcing particles is disclosed, comprising steps of: a) preparing evenly dispersed composite powders by chemical co-precipitation method combining with roasting, b) granulating the composite powders by high energy ball milling, and sieving the powders, c) mixing the powders and Ag matrix in a powder mixing machine, d) cold isostatic pressing, e) sintering, f) hot-pressing, g) hot-extruding to obtain Ag-based oxide contact materials with directionally arranged reinforcing particles. This method can obtain particle reinforced Ag-based material with good electrical performance even when the reinforced (oxide) particles are very small. This method is simple, easy to operate, and does not require special equipment. The resistance to welding and arc erosion, electric conductivity and the processability of the material prepared through this present invention can be greatly improved.
B22F 3/20 - Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor by extruding
H01H 1/0237 - Composite material having a noble metal as the basic material and containing oxides
C22C 32/00 - Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
B22F 3/04 - Compacting only by applying fluid pressure
A method of preparing silver-based oxide electrical contact materials with fiber-like arrangement, includes the following steps of: (1) uniformly mixing the silver-metal alloy powders and graphite powders and then ball-milling; (2) internally oxidizing the ball-milled powders; (3) sieving; (4) placing the sieved powders and the matrix powders into the powder mixer for mixing; (5) cold-isostatically pressing; (6) sintering; (7) hot-pressing; and (8) hot-extruding, thereby obtaining the silver-based oxide electrical contact material with fiber-like arrangement. The method of the present invention can obtain the silver-based oxide electrical contact material having neat fiber-like arrangement with no specific requirement on processing deformation, plasticity and ductility of the reinforcing phase. The production process in this method is simple and is easy to operate. Besides, there is no particular requirement on the equipment. The method greatly improves the performance of contact materials in aspects of resistance to welding and arc erosion, conductivity, and processing performance.
B22F 3/04 - Compacting only by applying fluid pressure
B22F 3/20 - Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor by extruding
H01B 1/02 - Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
A method for preparing silver-based oxide electrical contact material with oriented particles involves: producing complex powder by chemical co-precipitation method combined with sintering; granulating by high-energy ball-milling and sieving; mixing the powder and matrix Ag powder; cold isostatic pressing; sintering; hot pressing; and hot extruding. The method can produce particle-reinforced silver-based material having good electric properties, even with fine reinforcing particles, in a simple, easy and low-cost manner without special requirements for devices. The material produced by the method has improved melt-welding resistance, electric arc erosive resistance and electric conductivity, and shows an excellent processing performance.
The invention discloses a method for manufacturing Ag based oxide electrical contact materials with fibrous structure, and the following steps are: the first step, homogeneously mixing the Ag-metal alloying powders and graphite powders, and then milling; the second step, internally oxidizing the obtained powders after being milled; the third step, screening; the fourth step, pouring the powders after being screened and Ag based powders into mixing machine and then mixing; the fifth step, cold isostatic pressing; the sixth step, sintering; the seventh step, hot pressing; the eighth step, hot extruding, and obtaining the Ag based oxide electrical contact materials with fibrous structure. Ag based oxide electrical contact materials with obvious fibrous structure can be obtained in the invention and resistivity against welding, arc ablation resistance and electrical conductivity of materials have been greatly improved, and the machining property is excellent.
A method for preparing a fibrous silver-based oxide electrical contact material involves: melting Ag ingot, metal ingot and additive in a melting furnace, and atomizing to obtain powder; high-energy ball-milling; inner-oxidizing; granulation by high-energy ball-milling and sieving; mixing the powder after ball-milling and sieving with matrix; cold isostatic pressing; sintering; hot pressing; and hot extruding. The method can produce silver-based oxide electrical contact material with obvious fibrous structure, regardless of processing deformation and plasticity and extensibility of the reinforcing phase, in a simple and easy manner without special requirements for devices. The material produced by the method has improved melt-welding resistance, electric arc erosive resistance and electric conductivity, and shows an excellent processing performance.
A preparation method for silver matrix electrical contact materials enhanced by grains with oriented arrangement comprises the following steps: 1) employing process of chemical coating to produce complex powder containing enhancing phase coated by Ag; 2) pelleting; 3) adding the pelleted powder and Ag powder matrix into a mixer to mix; 4) cold isostatic pressing; 5) sintering; 6) hot pressing; 7) hot extruding to obtain the silver matrix electrical contact materials enhanced by grains with oriented arrangement. The method is simple, easy to operate and low cost. The electrical contact materials prepared by the method have the characteristics of good melting-welding resistance, electric arc erosive resistance, electrical conductivity and workability.
H01B 1/00 - Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
H01B 1/02 - Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
H01B 13/00 - Apparatus or processes specially adapted for manufacturing conductors or cables
B22F 9/24 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
B22F 3/16 - Both compacting and sintering in successive or repeated steps
B22F 1/02 - Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition comprising coating of the powder
C22C 1/05 - Mixtures of metal powder with non-metallic powder
16.
METHOD FOR PREPARING FIBROUS SILVER-BASED ELECTRICAL CONTACT MATERIAL
A method for preparing a fibrous silver-based electrical contact material involves: uniformly mixing powder material acting as reinforcing phase with silver powder as base before ball milling; mixing the obtained complex powder with the base silver powder in powder mixer; cold isostatic pressing; sintering; hot pressing; hot extruding and obtaining the fibrous silver-based electrical contact material. The method can produce silver-based electrical contact material with obvious fibrous structure, regardless of whether small or large processing deformation is and good or bad plasticity or extensibility of the reinforcing phase is, in a simple, easy and cost-efficient manner without special requirements for devices. The material has improved melt-welding resistance, electric arc erosive resistance and electric conductivity, and shows an excellent processing performance.
patents
