CN112301297A - Copper-based composite material reinforced by continuous tungsten fiber braid and preparation method thereof - Google Patents
Copper-based composite material reinforced by continuous tungsten fiber braid and preparation method thereof Download PDFInfo
- Publication number
- CN112301297A CN112301297A CN201910673086.7A CN201910673086A CN112301297A CN 112301297 A CN112301297 A CN 112301297A CN 201910673086 A CN201910673086 A CN 201910673086A CN 112301297 A CN112301297 A CN 112301297A
- Authority
- CN
- China
- Prior art keywords
- copper
- composite material
- tungsten
- continuous
- reinforcement framework
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
- C22C47/02—Pretreatment of the fibres or filaments
- C22C47/06—Pretreatment of the fibres or filaments by forming the fibres or filaments into a preformed structure, e.g. using a temporary binder to form a mat-like element
- C22C47/062—Pretreatment of the fibres or filaments by forming the fibres or filaments into a preformed structure, e.g. using a temporary binder to form a mat-like element from wires or filaments only
- C22C47/066—Weaving wires
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
- C22C47/08—Making alloys containing metallic or non-metallic fibres or filaments by contacting the fibres or filaments with molten metal, e.g. by infiltrating the fibres or filaments placed in a mould
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
- C22C49/10—Refractory metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
Abstract
The invention belongs to the field of metal matrix composite materials, and particularly relates to a copper matrix composite material reinforced by a continuous tungsten fiber braid and a preparation method thereof. The composite material consists of a reinforcement framework woven by continuous tungsten fibers and matrix copper, wherein the diameter of the tungsten fibers is 1-500 mu m, the content of tungsten is 15-80% by volume percentage, and the balance is the matrix copper. Firstly, weaving a reinforcement framework by using continuous tungsten fibers, then heating and melting copper in vacuum or protective atmosphere to infiltrate the copper into the reinforcement framework, and solidifying and cooling to obtain the composite material. The composite material has good electrical conductivity and thermal conductivity, can effectively resist arc erosion, has room temperature and high temperature strength which are obviously improved compared with matrix copper, and shows excellent plasticity and fracture toughness. The composite material is simple in preparation method, is suitable for industrial production, can be used as an electric contact material, a sweating panel material and the like, and is expected to remarkably improve the using effect.
Description
Technical Field
The invention belongs to the field of metal matrix composite materials, and particularly relates to a copper matrix composite material reinforced by a continuous tungsten fiber braid and a preparation method thereof.
Background
The copper-tungsten composite material is formed by compounding two metal phases of copper and tungsten in a simple substance form, so that the performance advantages of the two composition phases are combined, and the copper-tungsten composite material has good electrical conductivity and thermal conductivity and excellent high-temperature resistance, and has wide practical application in different fields of high-voltage power transmission, aerospace, nuclear reactors and the like. The copper-tungsten composite material is mainly used for manufacturing contacts of arc ablation resistant high-voltage electrical switches, high-temperature components such as rocket nozzle throat liners, tail rudders and the like, and can also be used as electrodes for electric processing, high-temperature dies and other key components requiring electric conduction, heat conduction performance and high-temperature application. Besides good electric and heat conducting properties, the copper-tungsten composite material can absorb a large amount of heat under the high-temperature condition by means of evaporation of matrix copper, so that the temperature of a key component is reduced, the key component is protected, and the purpose of bearing various severe use conditions including ultrahigh temperature, high pressure and corrosion is achieved.
The harsh conditions of use place stringent requirements on the overall properties of copper-tungsten composites, including higher hardness and strength, good wear resistance, plasticity, thermal conductivity, electrical conductivity, fusion welding resistance, electrical shock and arc ablation resistance, and lower contact resistance. For example, a high-voltage electrical contact needs to repeatedly engage and disengage under conditions of high voltage, large current, high vacuum and ultrahigh temperature, and under the condition of arc ablation resistance, the high-voltage electrical contact is required to maintain good integrity after being opened and closed for multiple times. In addition, the environment of two sides of the panel of the sweating material of the injector panel of the thrust chamber of the liquid hydrogen rocket engine and the liquid oxygen rocket engine is extremely severe, one side of the panel is required to bear the high temperature of 3200 ℃, the temperature of the liquid hydrogen on the other side is lower than-150 ℃, and the panel is required to bear the vibration fatigue stress in the working process, so that the panel is required to have extremely high permeability, thermal conductivity, high strength and rigidity, good oxidation resistance and good wear resistance.
At present, the existing copper-tungsten composite material is mainly prepared based on powder metallurgy and melt infiltration technology, namely, tungsten powder is sintered into a prepreg skeleton containing micro pores, copper is melted and then infiltrated to fill gaps of the skeleton, and the copper-tungsten composite material is obtained after solidification and cooling. The microstructure of the copper-tungsten composite material prepared by the method is generally uniform and isotropic, the distribution of matrix copper and reinforcing phase tungsten is random, and the connectivity of the two component phases in a three-dimensional space is poor. On one hand, compared with the matrix copper, the plasticity and fracture toughness of the material are usually reduced remarkably, and the material is easy to damage and even break in the repeated use process, and on the other hand, the poor connectivity of the matrix copper enables the electric conduction path and the heat conduction path to be narrow and tortuous, so that the electric conduction and the heat conduction of the composite material are limited. Meanwhile, the porosity of the tungsten skeleton prepared by using the powder metallurgy process is often low, so that the content of matrix copper in the composite material is restricted, and the electrical conductivity and the thermal conductivity of the composite material are difficult to continuously improve. In addition, organic matters such as a binder and the like are often required to be added in the process of preparing the tungsten framework by using a powder metallurgy process, so that on one hand, the organic matters are required to be removed by subsequent treatment, on the other hand, impurities such as residual carbon and the like in the material are easily caused, and the performance of the composite material is reduced. The practical use effect and the application range of the copper-tungsten composite material are limited to a great extent by the factors.
Disclosure of Invention
The invention aims to provide a copper-based composite material reinforced by a continuous tungsten fiber braid and a preparation method thereof, wherein the composite material is prepared by directly impregnating a reinforcement framework formed by braiding continuous tungsten fibers with molten copper, so that good electrical conductivity, thermal conductivity and arc ablation resistance are realized, and good plasticity and fracture toughness are realized while the room-temperature strength and high-temperature strength of matrix copper are obviously improved.
In order to achieve the purpose, the invention adopts the following scheme:
the copper-base composite material reinforced with continuous tungsten fiber braid consists of reinforcing skeleton woven with continuous tungsten fiber and base copper, and has tungsten fiber diameter of 1-500 micron, tungsten content of 15-80 vol% and base copper for the rest.
The compositeThe material has good electrical conductivity and thermal conductivity, can effectively resist arc erosion, has room temperature and high temperature strength remarkably improved compared with matrix copper, and shows excellent plasticity and fracture toughness, and the technical indexes are as follows: the density was 10.5g/cm3～17.3g/cm3The conductivity is not less than 1.9X 107S/m, heat conductivity not less than 180W/(m.K), room temperature tensile strength not less than 250MPa, elongation not less than 3.5%, and impact toughness not less than 35kJ/m2And the tensile strength is not lower than 40MPa at 800 ℃.
The preparation method of the copper-based composite material reinforced by the continuous tungsten fiber braid mainly comprises the following steps:
1) weaving a reinforcement framework by using continuous tungsten fibers;
2) cleaning the surface of the reinforcement framework and the surface of copper, placing the reinforcement framework and the surface of the copper in the same crucible, and heating the reinforcement framework in vacuum or protective atmosphere to ensure that the copper is molten and then is impregnated into the reinforcement framework;
3) and cutting off the excessive copper after solidification and cooling to obtain the copper-based composite material reinforced by the continuous tungsten fiber braid.
In the preparation method of the copper-based composite material reinforced by the continuous tungsten fiber braid, in the step 1), the diameter of the continuous tungsten fiber is 1-500 mu m, and the porosity of a reinforcement skeleton formed by weaving the tungsten fiber is 20-85%.
In the preparation method of the copper-based composite material reinforced by the continuous tungsten fiber braid, in the step 2), the protective atmosphere is one or more of argon, nitrogen, helium and hydrogen.
In the step 2), the heating temperature is higher than the melting point of copper and lower than the melting point of tungsten and is 1100-1550 ℃, the heat preservation time is not less than 5min, then the heating is stopped, and the copper-based composite material is cooled along with the furnace.
The design idea of the invention is as follows:
1) the reinforcement tungsten and the matrix copper selected by the invention have excellent physical properties, such as: the composite material formed by combining the tungsten and the copper has the advantages of high melting point, good wear resistance, corrosion resistance, high hardness, excellent electrical conductivity and thermal conductivity, and good plasticity and toughness of the copper;
2) because the melting point of the tungsten of the reinforcement is far higher than that of the copper of the matrix, and the solidified tungsten does not react with the copper in a molten state and does not form solid solution, the copper melt can be used for impregnating the reinforcement framework woven by the tungsten fibers to prepare the composite material, and the two-phase interface of the reinforcement and the matrix in the obtained composite material has good metallurgical bonding;
3) the tungsten of the reinforcement and the copper of the matrix in the composite material have good connectivity in a three-dimensional space, can provide a high-efficiency transmission channel for electric conduction and heat conduction, simultaneously fully exerts the reinforcement effect of the reinforcement, and enables the composite material to realize good plasticity and fracture toughness through micro mechanisms such as fiber pulling out from the matrix, matrix plastic sliding, fiber fracture and the like;
4) the preparation method of the composite material does not need organic matters such as adhesives and the like, so that the working procedure of removing the organic matters in the preparation process can be reduced, the energy is saved, and the influence of impurities such as residual carbon and the like on the material performance is avoided.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. compared with the composite material prepared by the traditional method, the copper-tungsten composite material has more excellent electrical conductivity, thermal conductivity, plasticity and fracture toughness, the designability of the composite material structure is strong, and the performance can be controlled by adjusting the structure and porosity of a tungsten fiber braided body.
2. The composite material has the advantages of simple preparation process, short flow, suitability for industrial production, and strong designability of the structure and the performance of the composite material, so the composite material has considerable application prospect in a plurality of fields as an electric contact material, a sweat-producing panel material and the like.
Drawings
Fig. 1 is a three-dimensional X-ray structural view of a skeleton of a tungsten fiber braid having a regularly arranged crossing structure prepared in example 1.
Fig. 2 is a scanning electron micrograph of 26.8% by volume tungsten reinforced copper-tungsten composite material with a continuous tungsten fiber braid having a regular array of intersecting structures prepared in example 1, wherein the white is tungsten fibers and the dark gray is matrix copper.
Fig. 3 is a room temperature tensile stress-strain curve of the copper-tungsten composite material reinforced with a continuous tungsten fiber braid having a helical structure and a volume fraction of tungsten of 63.5% prepared in example 2.
The specific implementation mode is as follows:
in the specific implementation process, the copper-based composite material reinforced by the continuous tungsten fiber braid and the preparation method thereof are as follows:
the composite material consists of a reinforcement framework woven by continuous tungsten fibers with the volume fraction of 15-80% (preferably 25-75%) and matrix copper, wherein the diameter of the tungsten fibers is 1-500 μm (preferably 10-200 μm). The preparation method of the composite material comprises the following steps: designing a three-dimensional weaving structure of a tungsten reinforcement, weaving continuous tungsten fibers into a reinforcement framework with a designed structure by adopting a manual or machine weaving method, cleaning the surfaces of the tungsten framework and copper, placing the tungsten framework and the copper in the same crucible, heating the reinforcement framework and the copper in vacuum or protective atmosphere, infiltrating the molten copper into the reinforcement framework, solidifying and cooling, and cutting off redundant copper to prepare the copper-based composite material reinforced by the continuous tungsten fiber weaving body. In particular, the diameter of the continuous tungsten fiber is 1 μm to 500 μm (preferably 10 μm to 200 μm), the porosity of the reinforcement frame woven by the tungsten fiber is 20% to 85% (preferably 25% to 75%), and the heating temperature of the mixed gas of one or more of argon, nitrogen, helium and hydrogen is 1100 ℃ to 1550 ℃ (preferably 1300 ℃ to 1400 ℃) which is higher than the melting point of copper and lower than the melting point of tungsten.
The present invention is further illustrated below with reference to specific examples, which are intended to illustrate the invention only and not to limit the scope of the invention.
Example 1:
in this example, a copper-tungsten composite material reinforced with a continuous tungsten fiber braid having a regularly arranged cross structure and having a volume fraction of tungsten of 26.8% was prepared. The raw materials used in this example were tungsten fiber (diameter 50 μm, purity 99.9 wt%) and industrial pure copper (purity 99.9 wt%), and the specific preparation process was as follows:
(A) the method comprises the steps of manually weaving tungsten fibers into a tungsten net according to mutually perpendicular orientation angles, flatly laying and stacking the tungsten net according to the same orientation angle, wherein the number of stacked layers is 27, fixing the stacked tungsten net by using the tungsten fibers, compacting a woven body at a pressure of 5MPa along a direction perpendicular to a net surface, maintaining the pressure for 5min, and unloading to obtain the regularly arranged tungsten fiber woven body framework with a cross structure. As shown in figure 1, the diameter of the tungsten fiber in the framework of the braided body is 50 μm, and the porosity is 73.2%;
(B) respectively immersing 500g of pure copper blocks and a tungsten fiber braided body framework into 5 wt% hydrofluoric acid alcohol solution for pickling for 20min to remove oxides on the surface, taking out the pure copper blocks and the tungsten fiber braided body framework, putting the pure copper blocks and the tungsten fiber braided body framework into acetone to remove grease and acid solution on the surface, taking out the pure copper blocks and the tungsten fiber braided body framework after 10min, drying the pure copper blocks and the tungsten fiber braided body framework in the atmosphere for 1h, flatly paving the dried tungsten fiber braided body framework in a high-purity graphite crucible, placing the pure copper blocks above the framework, putting the crucible in a resistance furnace, heating to 1350 ℃ at the speed of 10 ℃/min in the flowing argon atmosphere, preserving heat for 20min, stopping heating, and cooling.
(C) And after the furnace is cooled to room temperature, taking out the crucible, taking the material out of the crucible, and cutting off redundant pure copper to obtain the copper-tungsten composite material reinforced by the continuous tungsten fiber braided body with the regularly arranged cross structure. As shown in fig. 2, the bright white color is tungsten fibers and the dark gray color is the matrix copper, and the volume fraction of tungsten in the composite is 26.8%.
The density of the composite material is tested to be 11.74g/cm3The electrical conductivity was 4.67X 107S/m, thermal conductivity of 337W/(m.K), tensile strength at room temperature of 390MPa, elongation of 11.3 percent and impact toughness of 85kJ/m2And the tensile strength is 110MPa under the condition of 800 ℃.
Example 2:
in this example, a copper-based composite material reinforced with a continuous tungsten fiber braid having a helical structure and having a volume fraction of tungsten of 63.5% was prepared. The raw materials used in this example were the same as in example 1, and the specific preparation process was as follows:
(A) the tungsten fibers are woven into a tungsten net by an automatic weaving machine according to mutually vertical orientation angles, and then the tungsten net is tiled and stacked according to the orientation angles with the difference of 7.5 degrees between adjacent layers, wherein the number of stacked layers is 36. Fixing the stacked tungsten mesh by using tungsten fibers, compacting and densifying the braided body at 1000MPa along the direction vertical to the mesh surface of the tungsten mesh, and unloading after pressure maintaining for 1h to obtain a continuous tungsten fiber braided body skeleton with a spiral structure, wherein the diameter of the tungsten fibers in the skeleton is 50 mu m, and the porosity is 36.5%;
(B) the operation was the same as in step (B) in example 1;
(C) the operation was the same as in step (C) of example 1. The copper-based composite material reinforced by the continuous tungsten fiber braid with the spiral structure is obtained, and the volume fraction of tungsten in the composite material is 63.5%.
The density of the composite material is tested to be 15.56g/cm3The electrical conductivity was 3.24X 107S/m, thermal conductivity of 255W/(m.K), room-temperature tensile stress-strain curve shown in figure 3, and as can be seen from figure 3, the room-temperature tensile strength of the material is 540MPa, the elongation is 5.1%, and the impact toughness is 51kJ/m2And the tensile strength is 180MPa under the condition of 800 ℃.
Example 3:
in this example, a copper-based composite material reinforced with a continuous tungsten fiber braid having a regularly arranged cross structure and having a volume fraction of tungsten of 45.8% was prepared. The raw materials used in this example were the same as in example 1, and the specific preparation process was as follows:
(A) the operation was similar to that of the step (a) in example 1, except that the pressure used for compacting the braid was 500MPa, the dwell time was 30min, and the porosity of the skeleton of the braid was 54.2%.
(B) The operation was the same as in step (B) in example 1;
(C) the operation was the same as in step (C) of example 1. The copper-tungsten composite material reinforced by the continuous tungsten fiber braid with the regularly arranged cross structure is obtained, and the volume fraction of tungsten in the composite material is 45.8%.
The density of the composite material is tested to be 13.72g/cm3The electrical conductivity was 3.93X 107S/m, thermal conductivity of 294W/(m.K), tensile strength at room temperature of 450MPa, elongation of 7 percent and impact toughness of 59kJ/m2And the tensile strength is 150MPa at 800 ℃.
The embodiment result shows that the composite material has higher room temperature and high temperature strength and good impact resistance, the microstructure has stronger designability, the preparation process is simple, and the composite material is suitable for industrial production, so the composite material has very considerable application prospect as a high-performance electric contact material, a sweating panel material and the like.
Claims (6)
1. The copper-based composite material reinforced by the continuous tungsten fiber braid is characterized by comprising a reinforcement framework and matrix copper, wherein the reinforcement framework is formed by weaving continuous tungsten fibers, the diameter of the tungsten fibers is 1-500 mu m, the content of tungsten is 15-80% by volume percentage, and the balance of the matrix copper.
2. The copper-based composite material reinforced by the continuous tungsten fiber braid as claimed in claim 1, wherein the composite material has good electrical and thermal conductivity, and at the same time, is effective against arc erosion, has room and high temperature strength significantly improved compared to the matrix copper, and exhibits excellent plasticity and fracture toughness according to the following technical indexes: the density was 10.5g/cm3～17.3g/cm3The conductivity is not less than 1.9X 107S/m, heat conductivity not less than 180W/(m.K), room temperature tensile strength not less than 250MPa, elongation not less than 3.5%, and impact toughness not less than 35kJ/m2And the tensile strength is not lower than 40MPa at 800 ℃.
3. A method for preparing a copper-based composite material reinforced with a continuous tungsten fiber braid as claimed in any one of claims 1 to 2, which essentially comprises the steps of:
1) weaving a reinforcement framework by using continuous tungsten fibers;
2) cleaning the surface of the reinforcement framework and the surface of copper, placing the reinforcement framework and the surface of the copper in the same crucible, and heating the reinforcement framework in vacuum or protective atmosphere to ensure that the copper is molten and then is impregnated into the reinforcement framework;
3) and cutting off the excessive copper after solidification and cooling to obtain the copper-based composite material reinforced by the continuous tungsten fiber braid.
4. The method for preparing the copper-based composite material reinforced by the continuous tungsten fiber braid as claimed in claim 3, wherein the diameter of the continuous tungsten fiber is 1 μm to 500 μm in the step 1), and the porosity of the reinforcement framework woven by the tungsten fiber is 20% to 85%.
5. The method for preparing the copper-based composite material reinforced by the continuous tungsten fiber braid as claimed in claim 3, wherein the protective atmosphere in the step 2) is one or more of argon, nitrogen, helium and hydrogen.
6. The method for preparing the copper-based composite material reinforced by the continuous tungsten fiber braid as claimed in claim 3, wherein the heating temperature in the step 2) is higher than the melting point of copper and lower than the melting point of tungsten, and is 1100-1550 ℃, the holding time is not less than 5min, and then the heating is stopped, and the copper-based composite material is cooled along with the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910673086.7A CN112301297A (en) | 2019-07-24 | 2019-07-24 | Copper-based composite material reinforced by continuous tungsten fiber braid and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910673086.7A CN112301297A (en) | 2019-07-24 | 2019-07-24 | Copper-based composite material reinforced by continuous tungsten fiber braid and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112301297A true CN112301297A (en) | 2021-02-02 |
Family
ID=74329107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910673086.7A Pending CN112301297A (en) | 2019-07-24 | 2019-07-24 | Copper-based composite material reinforced by continuous tungsten fiber braid and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112301297A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113564499A (en) * | 2021-07-29 | 2021-10-29 | 安徽工业大学科技园有限公司 | Continuous tungsten fiber and zirconium carbide composite reinforced tungsten-copper material, preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51122620A (en) * | 1975-04-21 | 1976-10-26 | Hitachi Ltd | Process for producing cu-w fiber composite materials |
| CN102061431A (en) * | 2010-12-17 | 2011-05-18 | 上海工程技术大学 | Tungsten-copper composite material and preparation method thereof |
-
2019
- 2019-07-24 CN CN201910673086.7A patent/CN112301297A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51122620A (en) * | 1975-04-21 | 1976-10-26 | Hitachi Ltd | Process for producing cu-w fiber composite materials |
| CN102061431A (en) * | 2010-12-17 | 2011-05-18 | 上海工程技术大学 | Tungsten-copper composite material and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113564499A (en) * | 2021-07-29 | 2021-10-29 | 安徽工业大学科技园有限公司 | Continuous tungsten fiber and zirconium carbide composite reinforced tungsten-copper material, preparation method and application thereof |
| CN113564499B (en) * | 2021-07-29 | 2023-03-14 | 安徽工业大学科技园有限公司 | Continuous tungsten fiber and zirconium carbide composite reinforced tungsten-copper material, preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111250703B (en) | Magnesium-based composite material taking titanium or titanium alloy as framework reinforcement and preparation method thereof | |
| Yang et al. | Design of reinforced interfacial structure in brazed joints of C/C composites and Nb by pre-oxidation surface treatment combined with in situ growth of CNTs | |
| CN108950289B (en) | Copper-tungsten composite material with micro-oriented structure and preparation method thereof | |
| CN105695783B (en) | A kind of graphene/Cu-base composites and preparation method thereof | |
| CN104745887A (en) | Nano ceramic particle reinforced nickel-based superalloy composite material and laser 3D printing forming method thereof | |
| CN108994300B (en) | Carbon/metal composite material with micro-oriented structure for electric contact and preparation method thereof | |
| CN101386928A (en) | Method for preparing high-entropy alloy containing immiscible element | |
| CN113136505B (en) | High-strength and high-toughness heat-resistant aluminum alloy armature material and preparation method thereof | |
| CN105506345A (en) | Diamond/copper composite packaging material high in thermal conductivity and preparation method thereof | |
| Qi et al. | Promising metal matrix composites (TiC/Ni–Cr) for intermediate-temperature solid oxide fuel cell (SOFC) interconnect applications | |
| Ke et al. | Phase evolution of Mo-W-Cu alloy rapid prepared by spark plasma sintering | |
| CN112047739A (en) | Processable ceramic/metal gradient structure material and preparation method thereof | |
| Dong et al. | W–Cu system: synthesis, modification, and applications | |
| CN112301297A (en) | Copper-based composite material reinforced by continuous tungsten fiber braid and preparation method thereof | |
| CN100503851C (en) | Method for preparing tungsten copper or tungsten silver composite material | |
| CN109482885A (en) | Copper-base contact material and preparation method thereof with microcosmic oriented structure | |
| CN105714169B (en) | A kind of Mo Si B Hf Al alloy bar materials and preparation method thereof | |
| Liu et al. | Fabrication and microstructure of C/Cu composites | |
| CN108213762B (en) | Welding head for high-hardness spot welding machine and preparation method thereof | |
| CN116287833A (en) | Preparation method of in-situ authigenic two-dimensional carbide dispersion strengthening and toughening molybdenum alloy | |
| CN111218581B (en) | High-density high-strength silver-carbon composite electric contact material and preparation method thereof | |
| CN112111699B (en) | Magnesium-based composite material reinforced by titanium or titanium alloy fiber and preparation method thereof | |
| CN101608288B (en) | Preparation method for vacuum electric contact material capable of controlling cathode spot movement | |
| CN114921673A (en) | Nano oxide particle dispersion strengthened copper and preparation method thereof | |
| CN105118702B (en) | Cu alloy material powder composition, composite layer, electrical contact and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210202 |
|
| RJ01 | Rejection of invention patent application after publication |