CN111299599A - Silver-nickel or silver-ferroelectric contact material and preparation method thereof - Google Patents
Silver-nickel or silver-ferroelectric contact material and preparation method thereof Download PDFInfo
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- CN111299599A CN111299599A CN202010153798.9A CN202010153798A CN111299599A CN 111299599 A CN111299599 A CN 111299599A CN 202010153798 A CN202010153798 A CN 202010153798A CN 111299599 A CN111299599 A CN 111299599A
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- C22C32/001—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 with only oxides
- C22C32/0015—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 with only oxides with only single oxides as main non-metallic constituents
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- C22C32/0047—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 with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—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 with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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- H01H1/021—Composite material
- H01H1/023—Composite material having a noble metal as the basic material
- H01H1/0237—Composite material having a noble metal as the basic material and containing oxides
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- 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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- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
- B22F2009/0828—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid with water
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- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0844—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid in controlled atmosphere
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Abstract
The invention discloses a silver-nickel or silver-iron electric contact material and a preparation method thereof, which adopt a powder preparation and powder mixing integrated device, wherein an upper spray plate is communicated with a powder spraying device, a lower spray plate is communicated with high-pressure water, dispersion strengthening phase mixed powder is filled in the powder spraying device, in the process of preparing silver powder by high-pressure water atomization, the dispersion strengthening phase mixed powder is sprayed into silver melt by inert gas in a carrier, solid dispersion strengthening phase mixed powder is wrapped by high-temperature liquid silver to form stable metallurgical bonding, then the stable metallurgical bonding is formed by high-pressure water crushing and cooling, uniform mixed powder particles are formed, and the mixed powder particles are processed into an electric contact material by the procedures of drying, ingot pressing, extruding and the like. Compared with the traditional preparation process, the method has the remarkable advantages of high distribution uniformity of the dispersion strengthening phase particles in the silver matrix, high bonding strength of the dispersion strengthening phase particles and the silver matrix, green and environment-friendly manufacturing process, short production period and the like.
Description
Technical Field
The invention relates to the field of electrical contact materials, in particular to a silver-nickel or silver-ferroelectric contact material and a preparation method thereof.
Background
In the field of electric contacts, silver nickel and silver iron materials have excellent comprehensive electrical properties, so that the silver nickel and silver iron materials play an important role in the whole electric contact material system and are mainly applied to the field of contactors and relays below 25A. The iron, the nickel and the additives in the silver matrix belong to a dispersion strengthening phase for the silver matrix, and the arc erosion resistance and the fusion welding resistance of the silver matrix are improved in a dispersion strengthening mode, so that the distribution uniformity of the dispersion strengthening phase in the silver matrix and the bonding strength between the silver and the dispersion strengthening phase have decisive influence on the burning loss resistance and the conductivity of the electrical property of the contact material.
The silver-nickel and silver-iron materials are usually prepared by a powder metallurgy process, the traditional preparation method adopts mechanical mixing of silver powder, nickel powder, iron powder and additive powder, the mixture is extruded and molded by isostatic pressing equipment, the silver matrix and the dispersion strengthening phase powder mainly belong to a physical combination mode and are limited by the wettability between the silver matrix and the dispersion strengthening phase powder, the combination strength is not ideal, and the fusion welding resistance and the conductivity of the electric contact material are obviously influenced in the electric contact process. How to improve the wettability between the silver matrix and the dispersion strengthening phase powder and improve the bonding strength of the silver matrix and the dispersion strengthening phase powder is an important research and development direction in the field of electric contact material research and development.
On the basis of the traditional powder metallurgy (powder mixing-extrusion) process, domestic and foreign electrical contact material production enterprises develop a plurality of material preparation processes in sequence, improve the wettability between a silver matrix and a dispersion strengthening phase by methods such as codeposition, chemical coating and the like, and improve the bonding strength between the silver matrix and the dispersion strengthening phase by ball milling and multiple extrusion processes. Compared with the traditional powder metallurgy process, the processing method improves the bonding strength between the silver matrix and the dispersion strengthening phase to different degrees, but still has a plurality of defects.
Patent ZL200610049919.5 discloses a manufacturing process of silver-nickel electrical contact material, which adopts a ball milling-coprecipitation method to prepare raw material powder of silver-nickel electrical contact, and simultaneously adds trace rare earth elements with the aid of a high-speed shearing emulsifying machine to improve the comprehensive electrical performance of the product.
Patent ZL201210296397.4 discloses a method for preparing a silver-nickel electrical contact material by adopting a chemical coating process, wherein a layer of transition element for improving wettability between silver and nickel is coated on the surface of nickel powder, then the transition element and the silver powder are mixed to form mixed powder, and the mixed powder is processed into the silver-nickel electrical contact material by ingot pressing and extrusion.
Patent ZL201610515153.9 discloses a preparation method of silver-nickel electric contact material, adopts traditional powder metallurgy technology to extrude silver-nickel into strips, and then extrudes into strips with pressing ingots after shearing and crushing again and processes to finished products, and this kind of processing mode has solved the uneven phenomenon of nickel granule distribution in the silver matrix, but because of adopting the triple extrusion technology, production cycle is long, manufacturing cost is high, and the lumber recovery is low, is not suitable for mass production.
Therefore, how to improve the distribution uniformity of the dispersion strengthening phase in the silver-nickel and silver-ferroelectric contact material and the bonding strength of the dispersion strengthening phase and the silver matrix has important practical application value for improving the consistency of the arc burning resistance and the electric property of the silver-nickel and silver-ferroelectric contact material.
Disclosure of Invention
In order to solve the problems and the defects in the prior art, the invention aims to provide a silver-nickel or silver-ferroelectric contact material and a preparation method thereof. The method improves the distribution uniformity of the dispersion strengthening phase in the silver-nickel and silver-iron electric contact material and the bonding strength of the dispersion strengthening phase and the silver matrix, improves the arc burning resistance and the fusion welding resistance of the silver-nickel and silver-iron electric contact material, and further improves the reliability of the switching electric appliance in the using process.
In order to achieve the purpose, the technical scheme of the invention is to provide a silver-nickel or silver-ferroelectric contact material, which comprises the following steps:
(1) melting silver to form a silver melt;
(2) uniformly mixing dispersion strengthening phase powder, placing into a powder spraying device, and communicating with an upper spray plate of high-pressure water atomization equipment, wherein the dispersion strengthening phase powder consists of a main dispersion strengthening phase and an additiveThe main dispersion strengthening phase is one of carbonyl Ni powder, carbonyl Fe powder or carbonyl FeNi alloy powder, and the additive is W, WO3One or more of Re, WC, VC, Mo and MoC;
(3) the silver melt enters the central position of a spray disk of high-pressure water atomization equipment through a heat-insulating container, and meanwhile, a powder spraying device is started, inert gas is used as a carrier, dispersion strengthening phase powder is sprayed into the silver melt through an upper spray disk, and mixed liquid flow of liquid silver and solid dispersion strengthening phase powder is formed;
(4) the mixed liquid flow of the liquid silver and the solid dispersion strengthening phase powder passes through the center of a lower spray disk of high-pressure water atomization equipment, is crushed and cooled by high-pressure water to form silver-nickel or silver-ferromagnetic dispersion strengthening phase mixed powder, and is precipitated in a collecting barrel;
(5) drying, ingot pressing, extruding and drawing the silver-nickel or silver-ferromagnetic dispersion strengthening phase mixed powder to prepare a wire, and preparing a rivet contact by cold heading forming; or drying, pressing into ingots, extruding, rolling and punching to prepare the sheet contact.
Further setting the average particle size range of the dispersion strengthening phase powder to be 0.1-20 mu m.
It is further provided that the inert gas is argon or nitrogen.
The powder spraying device is further provided with inert gas pressure of 0.2-1.0 MPa and inert gas flow of 200-1000L/min.
The lower-layer spray plate of the high-pressure water atomization equipment is further provided with a water pressure of 20-200 MPa.
In addition, the invention also provides a silver-nickel or silver-ferroelectric contact material prepared by the method.
Compared with the known preparation process, the preparation method has the following advantages and positive effects:
1. the distribution uniformity of the dispersion strengthening phase particles in the silver matrix is improved. The dispersion strengthening phase powder particles are added in the process of preparing the silver powder by atomization and are uniformly distributed in the silver matrix, so that the problem of nonuniform distribution in the mechanical mixing process caused by large density difference between the silver and the dispersion strengthening phase particles is solved, and the consistency and the reliability of the electric contact material in the electric contact process are improved.
2. The bonding strength of the dispersion strengthening phase particles and the silver matrix is improved. In the traditional preparation process of the electrical contact material such as the powder metallurgy process and the chemical coating process, the silver and the dispersion strengthening phase particles are mainly physically combined, and the improvement degree of the bonding strength is limited even by methods such as multiple extrusion, improvement of the surface wettability of the dispersion strengthening phase particles and the like.
3. The preparation process is environment-friendly, and environment-friendly treatment pressure can not be brought. Compared with the co-deposition and chemical coating processes, the preparation process adopts a physical method, the wastewater in the atomization powder preparation process can be recycled after deposition and filtration, no additional acidic or alkaline wastewater is generated, and the production process is environment-friendly.
4. The invention has simple designed process route and short processing flow and is suitable for mass production. Compared with the conventional powder metallurgy process, the mixing between the dispersion strengthening phase particles and the silver matrix is completed in the silver powder preparation stage, so that the powder mixing process is saved; compared with more complex preparation processes such as chemical coating, multiple times of extrusion and the like, the method has more obvious advantages in the processing process and the production period.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 is a schematic diagram of a simplified construction of an apparatus used in the present invention;
FIG. 2 is a flow chart of a process for making a rivet contact according to an embodiment of the present invention;
fig. 3 is a flow chart of a process for making a sheet contact according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the integrated powder preparation and mixing apparatus includes a medium-frequency melting furnace (melting crucible a), a holding furnace (holding crucible b), an upper spray tray c, a lower spray tray d, a collecting barrel f, and a powder spraying device e. Wherein the intermediate frequency smelting furnace (smelting crucible a) is a fixed point casting furnace, and the casting center corresponds to the center of the holding furnace (holding crucible b). And a lower spray tray d and an upper spray tray c are arranged on the spray tray seat at the upper end of the collecting barrel f, wherein the lower spray tray d is connected with a high-pressure water pipeline, and the upper spray tray c is connected with a powder spraying device e. The upper spray tray c is provided with 4 groups of nozzles, the nozzles are uniformly arranged around the lower spray tray c at intervals (the included angle between the nozzles is 90 degrees), and the included angle between the spray direction of the nozzles and the base material liquid flow leaked from the leakage nozzle of the heat-insulating crucible b is 60-90 degrees; the lower spray tray d is provided with 4 groups of nozzles, the nozzles are uniformly arranged around the lower spray tray d at intervals (the included angle between the nozzles is 90 degrees), and the included angle between the spray direction of the nozzles and the base material liquid flow leaked from the leakage nozzle of the heat-insulating crucible b is 30-60 degrees. The heat preservation furnace (heat preservation crucible b) is arranged at the top of the upper spray plate c, the bottom of the heat preservation furnace (heat preservation crucible b) is provided with a discharge spout, and the center of the discharge spout corresponds to the center of the spray plate. The lower end of the collecting barrel f is connected with the filter pressing barrel h, and a butterfly valve g is arranged between the collecting barrel f and the filter pressing barrel h. A vacuum filtration device, a filtration water tank, a precipitation water tank and a high-pressure pump are also arranged between the pressure filtration barrel h and the high-pressure water pipeline to form a closed loop. The collecting barrel f is provided with a necessary drainage valve and an inflation valve.
The realization principle of the invention is as follows:
the powder preparation and powder mixing integrated equipment is changed into a double-layer spray plate on the basis of the traditional single-layer spray plate, wherein the upper-layer spray plate is communicated with a powder spraying device, and dispersion strengthening phase powder particles are conveyed by taking inert gas as a carrier; the lower spraying plate is connected with a high-pressure pump to transmit high-pressure water. After the silver is melted into a molten liquid, the molten liquid flows through the middle of the spray disk through a discharge spout below the heat-preservation crucible, when the liquid silver passes through the upper spray disk, the inert gas drives solid dispersion strengthening phase particles (nickel powder, iron powder, additive powder and the like) to enter silver liquid flow, and the dispersion strengthening phase particles are uniformly distributed in the silver molten liquid, are wrapped by the silver and are stably metallurgically bonded with the silver at high temperature; under the protection of inert gas, the dispersion strengthening phase particles are ensured not to be oxidized. Then the mixed liquid flow of the silver and the dispersion strengthening phase particles passes through the center of the lower spraying disc, is smashed and cooled by high-pressure water to form metal mixture powder with uniform particles, and is precipitated in a collecting barrel of high-pressure water atomization equipment. The silver-dispersion strengthening phase mixed powder is processed into the electric contact material after drying, screening, ingot pressing, sintering and extruding.
The following is further illustrated with reference to specific examples:
the first embodiment is as follows:
a) melting 18kg of silver in a graphite crucible of a medium-frequency smelting furnace to form silver solution;
b) 1.8kg of carbonyl Ni powder with the average particle size of 0.1 mu m and 0.2kg of W powder with the average particle size of 2 mu m are uniformly mixed, loaded into a powder spraying device and communicated with an upper-layer spray plate of high-pressure water atomization equipment; setting the pressure of high-purity nitrogen in powder spraying equipment to be 0.2MPa and the flow of inert gas to be 200L/min;
c) the lower layer spray plate of the high-pressure water atomization equipment is communicated with high-pressure water, the water pressure is set to be 20MPa, and the atomization equipment is started;
d) injecting the silver melt into a collecting barrel from the central position of a spray disk of high-pressure water atomization equipment through a heat-preservation crucible, starting a powder spraying device, spraying mixed powder of carbonyl Ni powder and W powder into the silver melt through an upper-layer spray disk by using high-purity nitrogen as a carrier, and forming mixed liquid flow of liquid silver and solid dispersion strengthening phase powder;
e) the mixed liquid flow of the liquid silver and the solid dispersion strengthening phase powder passes through the center of a lower spray disk of high-pressure water atomization equipment, is crushed by high-pressure water with the pressure of 20MPa and is cooled to form AgNi mixed powder, and the AgNi mixed powder is precipitated in a collecting barrel;
f) drying, ingot pressing, extruding and drawing the AgNi mixed powder to prepare an AgNi (10) wire, and preparing the rivet contact by cold heading forming.
Example two:
a) melting 20kg of silver in a graphite crucible of a medium-frequency smelting furnace to form silver solution;
b) 4.5kg of carbonyl Ni powder having an average particle size of 5 μm and 0.2kg of WO having an average particle size of 1 μm were mixed3Uniformly mixing the powder and 0.3kg of Re powder with the average particle size of 10 mu m, loading the mixture into a powder spraying device, and communicating the powder spraying device with an upper-layer spray plate of high-pressure water atomization equipment; setting the pressure of high-purity argon in powder spraying equipment to be 1.0MPa and the flow of inert gas to be 1000L/min;
c) the lower layer spray plate of the high-pressure water atomization equipment is communicated with high-pressure water, the water pressure is set to be 200MPa, and the atomization equipment is started;
d) the silver melt passes through a heat-insulating crucible, is injected into a collecting barrel from the central position of a spray disk of high-pressure water atomization equipment, a powder spraying device is started, high-purity argon is used as a carrier, carbonyl Ni powder and WO powder3Spraying the mixed powder of the powder and the Re powder into the silver solution through an upper spraying disc to form a mixed liquid flow of liquid silver and solid dispersion strengthening phase powder;
e) the mixed liquid flow of the liquid silver and the solid dispersion strengthening phase powder passes through the center of a lower spray disk of high-pressure water atomization equipment, is crushed by high-pressure water with the pressure of 200MPa and is cooled to form AgNi mixed powder, and the AgNi mixed powder is precipitated in a collecting barrel;
f) the AgNi mixed powder is prepared into AgNi (20) sheet contacts through drying, ingot pressing, extruding, rolling and punching.
Example three:
a) melting 8.8kg of silver in a graphite crucible of a medium-frequency smelting furnace to form silver solution;
b) 1kg of carbonyl Fe powder with the average particle size of 20 mu m, 0.1kg of WC powder with the average particle size of 0.1 mu m, 0.05kg of VC powder with the average particle size of 3.5 mu m and 0.05kg of MoC powder with the average particle size of 5 mu m are uniformly mixed, loaded into a powder spraying device and communicated with an upper spraying plate of high-pressure water atomization equipment; setting the high-purity argon pressure in the powder spraying equipment to be 0.5MPa and the inert gas flow to be 600L/min;
c) the lower layer spray plate of the high-pressure water atomization equipment is communicated with high-pressure water, the water pressure is set to be 100MPa, and the atomization equipment is started;
d) injecting the silver melt into a collecting barrel from the central position of a spray plate of high-pressure water atomization equipment through a heat-preservation crucible, starting a powder spraying device, spraying mixed powder of carbonyl Fe powder, WC powder, VC powder and MoC powder into the silver melt through an upper-layer spray plate by taking high-purity argon as a carrier, and forming mixed liquid flow of liquid silver and solid dispersion strengthening phase powder;
e) the mixed liquid flow of the liquid silver and the solid dispersion strengthening phase powder passes through the center of a lower spray disk of high-pressure water atomization equipment, is crushed by high-pressure water with the pressure of 100MPa and is cooled to form AgFe mixed powder, and the AgFe mixed powder is precipitated in a collecting barrel;
f) the AgFe mixed powder is prepared into the AgFe (10) sheet contact through drying, ingot pressing, extruding, rolling and punching.
Example four:
a) melting 18kg of silver in a graphite crucible of a medium-frequency smelting furnace to form silver solution;
b) uniformly mixing 1.7kg of carbonyl FeNi alloy powder with the average particle size of 2 mu m and 0.3kg of Mo powder with the average particle size of 1.5 mu m, loading the mixture into a powder spraying device, and communicating the powder spraying device with an upper spray plate of high-pressure water atomization equipment; setting the pressure of high-purity nitrogen in powder spraying equipment to be 0.8MPa and the flow of inert gas to be 400L/min;
c) the lower layer spray plate of the high-pressure water atomization equipment is communicated with high-pressure water, the water pressure is set to be 50MPa, and the atomization equipment is started;
d) injecting the silver melt into a collecting barrel from the central position of a spray disk of high-pressure water atomization equipment through a heat-preservation crucible, starting a powder spraying device, spraying mixed powder of carbonyl FeNi alloy powder and Mo powder into the silver melt through an upper-layer spray disk by using high-purity nitrogen as a carrier, and forming mixed liquid flow of liquid silver and solid dispersion strengthening phase powder;
e) the mixed liquid flow of the liquid silver and the solid dispersion strengthening phase powder passes through the center of a lower spray disk of high-pressure water atomization equipment, is crushed by high-pressure water with the pressure of 50MPa and is cooled to form AgFeNi mixed powder, and the AgFeNi mixed powder is precipitated in a collecting barrel;
f) the AgFeNi mixed powder is dried, pressed into ingots, extruded and drawn to prepare AgFeNi (10) wire rods, and the rivet contacts are prepared by cold heading forming.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (6)
1. A preparation method of a silver-nickel or silver-ferroelectric contact material is characterized by comprising the following steps:
(1) melting silver to form a silver melt;
(2) uniformly mixing dispersion strengthening phase powder, placing into a powder spraying device, and communicating with an upper spray plate of high-pressure water atomization equipment, wherein the dispersion strengthening phase powder consists of a main dispersion strengthening phase and an additive, the main dispersion strengthening phase is one of carbonyl Ni powder, carbonyl Fe powder or carbonyl FeNi alloy powder, and the additive is W, WO3One or more of Re, WC, VC, Mo and MoC;
(3) the silver melt enters the central position of a spray disk of high-pressure water atomization equipment through a heat-insulating container, and meanwhile, a powder spraying device is started, inert gas is used as a carrier, dispersion strengthening phase powder is sprayed into the silver melt through an upper spray disk, and mixed liquid flow of liquid silver and solid dispersion strengthening phase powder is formed;
(4) the mixed liquid flow of the liquid silver and the solid dispersion strengthening phase powder passes through the center of a lower spray disk of high-pressure water atomization equipment, is crushed and cooled by high-pressure water to form silver-nickel or silver-ferromagnetic dispersion strengthening phase mixed powder, and is precipitated in a collecting barrel;
(5) drying, ingot pressing, extruding and drawing the silver-nickel or silver-ferromagnetic dispersion strengthening phase mixed powder to prepare a wire, and preparing a rivet contact by cold heading forming; or drying, pressing into ingots, extruding, rolling and punching to prepare the sheet contact.
2. The method of claim 1 for preparing a silver-nickel or silver-ferroelectric contact material, characterized in that: the average particle size of the dispersion strengthening phase powder is 0.1-20 μm.
3. The method of claim 1 for preparing a silver-nickel or silver-ferroelectric contact material, characterized in that: the inert gas is argon or nitrogen.
4. The method of claim 1 for preparing a silver-nickel or silver-ferroelectric contact material, characterized in that: the inert gas pressure of the powder spraying device is 0.2-1.0 MPa, and the inert gas flow is 200-1000L/min.
5. The method of claim 1 for preparing a silver-nickel or silver-ferroelectric contact material, characterized in that: the water pressure of a lower-layer spray plate of the high-pressure water atomization equipment is 20-200 MPa.
6. A silver nickel or silver ferroelectric contact material prepared according to the method of any one of claims 1 to 5.
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Effective date of registration: 20220129 Address after: 325000 No. 308, Binhai fifth road, Wenzhou Economic and Technological Development Zone, Wenzhou City, Zhejiang Province Applicant after: Zhejiang Fuda alloy material technology Co.,Ltd. Address before: No. 518, Binhai 4th Road, Binhai Park, Wenzhou Economic and Technological Development Zone, Zhejiang Province, 325000 Applicant before: FUDA ALLOY MATERIALS Co.,Ltd. |
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