CN113145855A - Device and method for preparing high-melting-point alloy powder by electric arc - Google Patents
Device and method for preparing high-melting-point alloy powder by electric arc Download PDFInfo
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- CN113145855A CN113145855A CN202110206135.3A CN202110206135A CN113145855A CN 113145855 A CN113145855 A CN 113145855A CN 202110206135 A CN202110206135 A CN 202110206135A CN 113145855 A CN113145855 A CN 113145855A
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- 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
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
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- 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
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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- 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
- B22F2304/00—Physical aspects of the powder
- B22F2304/10—Micron size particles, i.e. above 1 micrometer up to 500 micrometer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to the technical field of alloy powder preparation, in particular to a device and a method for preparing high-melting-point alloy powder by using high-temperature electric arc. The device comprises a powder collecting device, a melting electrode and a non-melting electrode, wherein the melting electrode and the non-melting electrode are used for generating electric arcs, and the melting electrode and the non-melting electrode are inserted into an opening of the collecting device; the melting electrode is provided with a tungsten electrode through a metal wire; the metal wire passing through the melting electrode is connected with the anode of an electric arc generation power supply, the tungsten electrode is connected with the cathode of the electric arc generation power supply, and the electric arc is ignited between the metal wire and the tungsten electrode; the atomizing spray pipe is arranged on one side of the electric arc, high-speed gas sprayed out of the atomizing spray pipe is directly sprayed onto molten drops formed by electric arc combustion, bypass side blowing is carried out, and the molten drops are further finely atomized; the wire feeder is used for conveying metal wires into the melting electrode. The alloy powder prepared by the preparation method can meet the shape requirement of spherical powder; the particle size distribution of the powder is adjusted according to the current, the powder preparation efficiency is high, and the types of the prepared powder are flexible.
Description
Technical Field
The invention relates to the technical field of alloy powder preparation, in particular to a device and a method for preparing high-melting-point alloy powder by electric arc.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
With the development of additive manufacturing, there is an increasing demand for various alloy powders. Generally, there are four methods for preparing alloy powder commonly used at home and abroad, namely atomization, electrolytic deposition, chemical reduction, mechanical pulverization and the like, wherein the atomization method is a mainstream method for preparing powder for additive manufacturing because spherical powder can be obtained. The atomization method is a powder preparation method in which a fast moving fluid (atomizing medium) impacts or otherwise breaks metal or alloy liquid into fine liquid droplets, and then the fine liquid droplets are condensed into solid powder, so that not only can metal powder of Pb, Sn, Zn, Cu, Fe, Ni and the like be prepared, but also alloy powder of aluminum alloy, zinc alloy, nickel alloy, stainless steel and the like can be prepared. When the metal raw materials are atomized and powdered, the metal raw materials are firstly smelted into alloy liquid with qualified components (generally overheated by 100-150 ℃) by an electric furnace or an induction furnace, then the alloy liquid is injected into a tundish positioned above an atomizing nozzle, and the alloy liquid meets high-speed airflow or water flow when passing through the nozzle and is atomized into fine liquid drops, and the atomized liquid drops are rapidly solidified into alloy powder in a closed atomizing cylinder. The atomization powder preparation method adopted at present can be seen in that the atomization powder preparation needs very high melting temperature, the temperature which can be reached by common equipment does not exceed 1600 ℃, and if high-melting-point materials are needed for powder preparation, the equipment and the cost have not little challenge. And other powder-making methods can be carried out only by uniformly smelting the prepared alloy material, and for a material with a high melting point, how to smelt the material into a uniform and segregation-free bulk material is also a difficult problem.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a device and a method for preparing high-melting-point alloy powder by electric arc, which utilize the high-temperature performance of the electric arc and match with a solid-core welding wire or a flux-cored welding wire with proper components, finish metallurgical reaction in the process of forming molten drops by heating the welding wire by the electric arc, and utilize high-speed gas to quickly blow away the molten drops to form fine particles so as to achieve the purpose of powder preparation.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
in a first aspect of the present invention, there is provided an apparatus for arc-preparing a refractory alloy powder, comprising:
a powder collection device, and,
a consumable electrode and a non-consumable electrode where an arc occurs, both the consumable electrode and the non-consumable electrode being inserted into the opening of the collection device; the melting electrode is provided with a tungsten electrode through a metal wire; the metal wire passing through the melting electrode is connected with the anode of an electric arc generation power supply, the tungsten electrode is connected with the cathode of the electric arc generation power supply, and the electric arc is ignited between the metal wire and the tungsten electrode;
the atomizing nozzle is arranged on one side of the electric arc, and high-speed gas sprayed by the atomizing nozzle is directly sprayed on molten drops formed by electric arc combustion to carry out bypass side blowing so as to further finely atomize the molten drops;
and the wire feeding device is used for conveying the metal wire into the melting electrode.
In a second aspect of the present invention, there is provided a method for preparing a refractory alloy powder by arc welding, comprising the steps of:
(1) charging a protective medium into the powder collection device;
(2) the metal wire in the consumable electrode is connected with the anode of the electric arc generating power supply, the tungsten electrode in the non-consumable electrode is connected with the cathode of the electric arc generating power supply, power is supplied to enable the electric arc to strike an arc between the metal wire and the tungsten electrode and stably burn, and the metal wire is melted to form molten drops;
(3) and (3) spraying molten drops formed by melting the metal wire into a powder collecting device below under the action of the coaxial gas of the melting electrode, the coaxial gas of the tungsten electrode and the blowing force of the bypass atomizing spray pipe, cooling the molten drops to form alloy powder with a certain particle size range, and screening out the powder with required particle size to obtain the high-melting-point alloy powder.
The specific embodiment of the invention has the following beneficial effects:
(1) the method has the advantages that the cost is low, the realization is easy, a vacuum system and a complex heating and heat-insulating device are not involved, and the alloying is realized by utilizing the arc metallurgy reaction;
(2) the formed molten drop is spherical, and can meet the shape requirement of additive manufacturing on spherical powder; the particle size distribution of the powder can be adjusted according to the current, the larger the current is, the faster the wire feeding speed of the melting electrode is, and the smaller the particle size of the obtained powder is;
(3) the powder preparation efficiency is high, and when the molten drop transition reaches a jet flow transition state, most of the obtained powder is distributed in the range of 20-300 microns;
(4) the prepared powder has flexible variety, does not depend on the variety of solid welding wires, and can be prepared by the method as long as the metal powder capable of being drawn into the flux-cored welding wire comprises aluminum base, copper base, iron base, nickel base, titanium base and the like; for refractory alloy, the powder is difficult to be prepared by using a traditional atomization method, and the powder can be prepared by using the method after the powder is drawn into a flux-cored wire according to the component proportion, so that the problems of difficult integral smelting, serious segregation and the like are completely avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of an arc pulverizing apparatus according to the present invention;
FIG. 2 is a graph showing a particle size distribution of a powder obtained by using a solid austenitic stainless steel welding wire according to example 2 of the present invention;
FIG. 3 is a graph showing the particle size distribution of the powder obtained by the titanium skin flux-cored wire of example 4 of the present invention;
the device comprises an arc generation power supply 1, a consumable electrode 2, a non-consumable electrode 3, a tungsten electrode 4, powder particles 5, cooling liquid 6, a collector 7, an arc 9, molten drops 10, a bypass side-blown atomizing nozzle 11, metal wires 12 and a wire feeding device.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In one embodiment of the present invention, there is provided an apparatus for arc-producing a high melting point alloy powder, including:
a powder collection device, and,
a consumable electrode and a non-consumable electrode where an arc occurs, both the consumable electrode and the non-consumable electrode being inserted into the opening of the collection device; the melting electrode is provided with a tungsten electrode through a metal wire; the metal wire passing through the melting electrode is connected with the anode of an electric arc generation power supply, the tungsten electrode is connected with the cathode of the electric arc generation power supply, and the electric arc is ignited between the metal wire and the tungsten electrode;
the atomizing nozzle is arranged on one side of the electric arc, and high-speed gas sprayed by the atomizing nozzle is directly sprayed on molten drops formed by electric arc combustion to carry out bypass side blowing so as to further finely atomize the molten drops;
and the wire feeding device is used for conveying the metal wire into the melting electrode.
In a particular embodiment, the powder collection device is a container structure having a protective media disposed therein; further preferably, the protective medium is selected from one or both of an inert gas or liquid nitrogen;
in a specific embodiment, the melting electrode is provided with a wire feeding pipe capable of continuously feeding wires and an argon pipeline;
in a specific embodiment, an argon protection tube and a water cooling tube are further arranged in the non-melting electrode;
in a specific embodiment, the melting electrode and the non-melting electrode form an included angle, and the included angle ranges from 10 degrees to 90 degrees;
in a specific embodiment, the current range of the arc stable combustion is 150-900A, and the arc voltage is 20-50V;
in a specific embodiment, the high-speed gas sprayed out from the atomization nozzle is inert protective gas, and is further preferably argon;
in a specific embodiment, the interior of the atomizing nozzle is provided with a Laval nozzle structure, so that the speed of the gas sprayed out of the atomizing nozzle is increased;
in the specific embodiment of the invention, the cathode adopts a non-melting tungsten electrode, so that molten drops formed by the anode metal wire are easier to control in a certain range; in the specific embodiment of the invention, a bypass side-blowing atomizing nozzle device is adopted, the atomizing nozzle is provided with a throat pipe structure (Laval nozzle) for accelerating gas flow, and the sprayed high-speed gas is directly sprayed onto the formed molten drops so as to be separated from the end parts of the metal wires as soon as possible and dispersed into small molten drops.
In one embodiment of the present invention, there is provided a method for arc-producing a high melting point alloy powder, comprising the steps of:
(1) charging a protective medium into the powder collection device;
(2) the metal wire in the consumable electrode is connected with the anode of the electric arc generating power supply, the tungsten electrode in the non-consumable electrode is connected with the cathode of the electric arc generating power supply, power is supplied to enable the electric arc to strike an arc between the metal wire and the tungsten electrode and stably burn, and the metal wire is melted to form molten drops;
(3) and (3) spraying molten drops formed by melting the metal wire into a powder collecting device below under the action of the coaxial gas of the melting electrode, the coaxial gas of the tungsten electrode and the blowing force of the bypass atomizing spray pipe, cooling the molten drops to form alloy powder with a certain particle size range, and screening out the powder with required particle size to obtain the high-melting-point alloy powder.
In a specific embodiment, the metal wire is provided with coaxial gas protection, and the flow rate of the coaxial gas protection is 10-20L/min; further preferably, the coaxial shielding gas is argon.
In a specific embodiment, the bypass atomization nozzle blows out argon gas flow; the flow of the bypass blowing argon is 20-40L/min.
In a particular embodiment, the metal wire is selected from a solid metal wire or a flux cored wire.
The electric arc heating temperature utilized by the invention is high, the liquid metal can be locally formed, and in addition, the liquid metal is easy to form a spherical shape in the free cooling process; the arc metallurgy reaction also makes it possible to use flux-cored wires for smelting (the arc temperature is 6000-8000 ℃, the average temperature of formed molten drops is 2000 ℃), i.e. alloy ingots do not need to be prepared in advance, and the flux-cored wires consisting of element powder can obtain the desired alloy powder by the arc metallurgy reaction.
The invention realizes the preparation of alloy powder by utilizing the molten drop transition formed by electric arc, mainly utilizes the high temperature of the electric arc to realize the melting of the alloy and the corresponding metallurgical reaction, and is different from atomization powder preparation in that the invention only needs to form a small amount of local melting instead of integral melting of more than several kilograms, thereby avoiding complex heating, heat preservation and vacuum pumping equipment. On one hand, the temperature of the electric arc can meet the requirement of melting high-melting-point materials, on the other hand, the formed molten drop is spherical, the shape requirement of spherical powder can be met, and meanwhile, the distribution of the particle size of the molten drop can be adjusted through the control of the electric arc current.
The invention will be further explained and illustrated with reference to specific examples.
Example 1
As shown in fig. 1, an apparatus for preparing a refractory alloy powder by arc welding includes: the collector 7, the consumable electrode 2 and the non-consumable electrode 3, wherein the consumable electrode 2 and the non-consumable electrode 3 are inserted into the opening of the collector 7; the collector 7 is a container structure in which a protective medium is arranged, and the protective medium is selected from one or two of inert gas or liquid nitrogen;
the melting electrode 2 is provided with a metal wire 11, and the non-melting electrode 3 is provided with a tungsten electrode 4; the metal wire 11 is connected with the anode of the electric arc generating power supply 1, the tungsten electrode 4 is connected with the cathode of the electric arc generating power supply 1, and the electric arc starts between the metal wire 11 and the tungsten electrode 4;
the melting electrode 2 is provided with coaxial protective gas; a coaxial protective gas and water cooling device is arranged on the non-melting electrode 3;
as shown in fig. 1, the device for preparing the high-melting-point alloy powder by electric arc further comprises a bypass side-blown atomizing nozzle 10 and a wire feeding device 12; the bypass side-blown atomizing nozzle 10 is arranged at one side of the electric arc, and argon sprayed from a nozzle of the bypass side-blown atomizing nozzle 10 is directly sprayed onto molten drops formed by electric arc combustion; the bypass side-blown atomizing nozzle 10 is provided with a Laval nozzle structure;
the wire feeder 12 is used for feeding a metal wire 11 to the consumable electrode 2, and the metal wire 11 is selected from a solid metal welding wire or a flux-cored welding wire.
Example 2
Laser additive manufactured stainless steel powder was prepared using the apparatus described in example 1:
the welding wire is an ER308 stainless steel welding wire with the diameter of 1.2mm, and liquid nitrogen is filled into a collector for collecting powder and molten drops;
the ER308 stainless steel welding wire in the consumable electrode is connected with the anode of the electric arc generating power supply, and the tungsten electrode in the non-consumable electrode is connected with the cathode of the electric arc generating power supply, so that the electric arc is ignited and stably burnt between the ER308 stainless steel welding wire and the tungsten electrode; when the current is 300A, the flow of argon for coaxial gas protection of the ER308 stainless steel welding wire is 15L/min, the flow of argon for a non-melting electrode is 15L/min, the flow of argon for a bypass side-blown atomization spray pipe is 30L/min, formed molten droplets are directly sprayed into liquid nitrogen, and the obtained metal powder is collected;
the particle size distribution of the obtained metal powder was collected as shown in FIG. 2, and the particle size was mainly distributed between 100 and 200. mu.m.
Example 3
An iron-based amorphous powder was prepared using the apparatus described in example 1:
the flux-cored wire is drawn by high-purity iron sheet-coated metal powder, and the nominal component of the flux-cored wire is Fe67Cu2Nb3Si19B9The diameter of the welding wire is 2.0 mm; filling liquid nitrogen into a powder collector for collecting powder;
the flux-cored wire in the consumable electrode is connected with the anode of the electric arc generating power supply, and the tungsten electrode in the non-consumable electrode is connected with the cathode of the welding power supply, so that the electric arc is ignited between the flux-cored wire and the tungsten electrode and is stably burnt; when the current is 350A, the flux-cored wire coaxial gas protection argon flow is 15L/min, the argon flow of a non-melting electrode is 15L/min, the argon flow of the bypass side-blown atomization spray pipe is 30L/min, the formed molten drops are directly sprayed into liquid nitrogen, and the iron-based amorphous powder is collected and can be further used for spraying.
Example 4
High entropy alloy powders were prepared using the apparatus described in example 1:
the welding wire is a flux-cored wire manufactured by drawing pure titanium skin coated metal powder, and the welding wire comprises the components of CrNbTa0.5Ti1.5V, the diameter of the welding wire is 2.0 mm; filling liquid nitrogen into a collector for collecting powder and molten drops;
the flux-cored wire in the consumable electrode is connected with the anode of the electric arc generating power supply, and the tungsten electrode in the non-consumable electrode is connected with the cathode of the electric arc generating power supply, so that the electric arc is ignited and stably burnt between the flux-cored wire and the tungsten electrode; when the current is 400A, the flux-cored wire coaxial gas protection argon flow is 10L/min, the argon flow of a non-melting electrode is 10L/min, the argon flow of the bypass side-blown atomizing nozzle is 30L/min, formed molten drops are directly sprayed into liquid nitrogen, high-entropy alloy powder is obtained by collection, the particle size distribution of the powder is shown in figure 3, and the powder can be further used for hot-pressing synthesis of massive materials.
Example 5
High entropy alloy powders were prepared using the apparatus described in example 1:
the welding wire is a flux-cored wire manufactured by drawing pure nickel coating metal powder, and the component of the welding wire is Al10Ni35Ti20Zr35The diameter of the welding wire is 2.0 mm; filling liquid nitrogen into a collector for collecting powder and molten drops;
the flux-cored wire in the consumable electrode is connected with the anode of the electric arc generating power supply, and the tungsten electrode in the non-consumable electrode is connected with the cathode of the electric arc generating power supply, so that the electric arc is ignited and stably burnt between the flux-cored wire and the tungsten electrode; when the current is 450A, the flux-cored wire coaxial gas protection argon flow is 20L/min, the argon flow of a non-melting electrode is 20L/min, the argon flow of the bypass side-blown atomization spray pipe is 30L/min, formed molten drops are directly sprayed into liquid nitrogen, high-entropy alloy powder is obtained by collection, and the high-entropy alloy powder can be further used for hot-pressing synthesis of massive materials.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An apparatus for preparing a refractory alloy powder by arc welding, comprising:
a powder collection device, and,
a consumable electrode and a non-consumable electrode where an arc occurs, both the consumable electrode and the non-consumable electrode being inserted into the opening of the collection device; the melting electrode is provided with a tungsten electrode through a metal wire; the metal wire passing through the melting electrode is connected with the anode of an electric arc generation power supply, the tungsten electrode is connected with the cathode of the electric arc generation power supply, and the electric arc is ignited between the metal wire and the tungsten electrode;
the atomizing nozzle is arranged on one side of the electric arc, and high-speed gas sprayed by the atomizing nozzle is directly sprayed on molten drops formed by electric arc combustion to carry out bypass side blowing so as to further finely atomize the molten drops;
and the wire feeding device is used for conveying the metal wire into the melting electrode.
2. The apparatus for arc producing refractory alloy powder as defined in claim 1, wherein said powder collecting means is a container structure in which a protective medium is disposed; preferably, the protective medium is selected from one or both of an inert gas or liquid nitrogen.
3. The apparatus for preparing the high melting point alloy powder by arc as claimed in claim 1, wherein the consumable electrode has a wire feeding tube for continuously feeding wire and an argon gas pipe; or an argon protection tube and a water cooling tube are also arranged in the non-melting electrode.
4. The apparatus for preparing refractory alloy powder by arc welding as claimed in claim 1, wherein the melting electrode and non-melting electrode are at an angle in the range of 10-90 degrees.
5. The apparatus for preparing the refractory alloy powder by arc as claimed in claim 1, wherein the arc-stabilized combustion current is in the range of 150-900A and the arc voltage is 20-50V.
6. The apparatus for preparing the high melting point alloy powder by arc according to claim 1, wherein the high-speed gas sprayed from the atomizing nozzle is an inert shielding gas, preferably argon;
or the inside of the atomizing nozzle is provided with a Laval nozzle structure.
7. A method for preparing high-melting-point alloy powder by electric arc is characterized by comprising the following steps:
(1) charging a protective medium into the powder collection device;
(2) the metal wire in the consumable electrode is connected with the anode of the electric arc generating power supply, the tungsten electrode in the non-consumable electrode is connected with the cathode of the electric arc generating power supply, so that the electric arc is ignited and stably burnt between the metal wire and the tungsten electrode, and the metal wire is melted to form molten drops;
(3) and (3) spraying molten drops formed by melting the metal wire into a powder collecting device below under the action of the coaxial gas of the melting electrode, the coaxial gas of the tungsten electrode and the blowing force of the bypass atomizing spray pipe, cooling the molten drops to form alloy powder with a certain particle size range, and screening out the powder with required particle size to obtain the high-melting-point alloy powder.
8. The method for preparing a high melting point alloy powder by arc of claim 7, wherein the metal wire is provided with a coaxial gas shield, the coaxial gas shield flow rate is 10 to 20L/min; preferably, the coaxial shielding gas is argon.
9. The method for arc producing refractory alloy powders as set forth in claim 7 wherein a flow of argon is blown through the bypass side-blown atomizing nozzle; the flow of argon gas blown by the bypass is 10-40L/min.
10. The method of arc producing high melting point alloy powders of claim 7 wherein the metal wire is selected from the group consisting of solid metal wire and flux cored wire.
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| CN114351078A (en) * | 2021-12-22 | 2022-04-15 | 浙江巴顿焊接技术研究院 | Plasma arc spraying method using current-carrying wire |
| CN115229195A (en) * | 2022-08-04 | 2022-10-25 | 中国地质大学（北京） | Nano amorphous alloy preparation device |
| CN115430846A (en) * | 2022-09-30 | 2022-12-06 | 江苏理工学院 | Consumable electrode argon arc welding 3D printing material increase device and method |
| CN115889795A (en) * | 2022-12-16 | 2023-04-04 | 西安宝德九土新材料有限公司 | Spherical tungsten-copper composite powder and preparation method thereof |
| CN116511513A (en) * | 2023-06-27 | 2023-08-01 | 陕西禾顺新材科技有限公司 | Preparation device and method of ferrotitanium alloy powder |
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