LU102169B1 - Method for preparing high-densification tungsten-copper refractory alloy - Google Patents
Method for preparing high-densification tungsten-copper refractory alloy Download PDFInfo
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- LU102169B1 LU102169B1 LU102169A LU102169A LU102169B1 LU 102169 B1 LU102169 B1 LU 102169B1 LU 102169 A LU102169 A LU 102169A LU 102169 A LU102169 A LU 102169A LU 102169 B1 LU102169 B1 LU 102169B1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
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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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
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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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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Abstract
The present application discloses a method for preparing a high-densification tungsten-copper refractory alloy, comprising the following steps: (1) placing prefabricated powder obtained after mixing tungsten powder and copper powder into a high-purity graphite pressing mold coated with a boron nitride coating; (2) forming the graphite pressing mold in step (1) by cold pressing; (3) placing the graphite pressing mold which is filled with samples after cold pressing in step (2) into the chamber of the oscillating pressure sintering furnace for sintering to obtain the finished product, the present application adopts an oscillating pressure sintering approach, such that the tungsten-copper alloy is subjected to a multi-field coupling reaction of a heat field and a force field in the insulating graphite mold to form a copper mesh by melted and solidified then filled in gaps between tungsten particles. And a circulating pressure can drive powder to be re-arranged, liquid phase to be flowed and hole to be discharged . Finally the high-densification refractory alloy is obtained after jollification and forming. The obtained alloy basically reaches the theoretical densification. Moreover, the tungsten-copper refractory alloy prepared by the present application performs melting and solidification reactions only, and the precipitated phase is simple.
Description
METHOD FOR PREPARING HIGH-DENSIFICATION TUNGSTEN-COPPER LU102169 | REFRACTORY ALLOY |
[0001] 1. Technical Field |
[0002] The present application relates to a method for preparing a refractory alloy, | in particular to a method for preparing a high-densification tungsten-copper refractory ; alloy. .
[0003] 2. Description of Related Art |
[0004] Refractory metals and alloys have unique advantages of high plasticity, | high ductility and resistance to high temperature, and are usually used as a hyper-thermal | material. The refractory metal tungsten (W) is widely applied in various key fields such as . aerospace, weaponry and industry in virtue of its features of high melting point and | relatively high resistance to oxidation, thermal shock, ablation and souring. Other metals | and ceramics can be added into tungsten by a reasonable design to form tungsten alloys | and other composite materials that have a high specific weight and a high density. The | tungsten alloys and other composite materials are further improved in strength, creep A resistance and resistance to environmental factors. For example, W-Cu alloy and W-Ni-Cu | alloy have high resistance to heat, high conductivity and resistance to electric arc and | friction, usually used as a material for manufacturing guide rails for military | electromagnetic guns, high-voltage contacts and aero-gyrorotors. .
[0005] At present, the most difficult issue to prepare the tungsten-copper alloy | with high performance is complete densification of the material. The void content and deficiency degree of the material directly affect all properties of the material. For example, | the W-Cu alloy material with a relative density of less than 99.5% hardly meets the high | conductivity demand of an electric spark electrode material. Due to its high strength and | high air tightness, the relative electric spark electrode material requires a relative density | of greater than 98%. For the tungsten-copper alloy, there is great difference between the | melting points of tungsten and copper. The melting point of tungsten is 3410°C, far higher Ë than that of copper. Moreover, tungsten and copper are not soluble with each other. ; Therefore, the traditional preparation processes of the tungsten-copper alloys are powder Ë metallurgy methods, mainly including a melt filtration method, a high-temperature | liquid-phase sintering method and an activated liquid phase sintering method; relatively | novel preparation processes of the tungsten-copper alloys include novel micro sintering, | metal injection molding, hot pressing sintering, tungsten-copper gradient material : preparation technique and other unusual methods such as laser sintering and electric arc | smelting. However, the refractory materials obtained by such methods tend to swell and | hardly achieve theoretically complete densification. Moreover, a higher sintering | temperature and a longer sintering time usually lead to abnormal grain growth, reduce | performance, increase energy consumption, and have become a bottleneck for limiting the | wide application of the methods. Therefore, it is still an important task for domestic | researchers to improve the preparation and synthesis process of the tungsten-copper . alloys. |
[0006] To overcome defects in the prior art, the objective of the present application | is to provide a method for preparing a high-densification tungsten-copper refractory alloy. | The obtained tungsten-copper refractory alloy has the feature of a higher relatively density. | The present application overcomes the difficulty to sinter the tungsten-copper alloys and | enhances the densification degree. |
[0007] The objective of the present application can be achieved by the following | technical solution: |
[0008] A method for preparing a high-densification tungsten-copper refractory LU102169 | alloy includes the following steps: |
[0009] (1) placing prefabricated powder obtained after mixing tungsten powder | and copper powder into a high-purity graphite pressing mold coated with a boron nitride ; coating; |
[0010] (2) forming the graphite pressing mold in step (1) by cold pressing; |
[0011] (3) placing the graphite pressing mold which is filled with samples after | cold pressing in step (2) into the chamber of the oscillating pressure sintering furnace for | sintering to obtain the finished product. |
[0012] Further, in step (1), the mass percent of the tungsten powder is 90%, and | the mass percent of the copper powder is 10%. :
[0013] Further, in step (3), the temperature rising rate for sintering is 8°C/min; the : sintering temperature is 1050-1200°C; and the holding time is 0.5-2 h. |
[0014] Further, in step (3), when the temperature reaches the sintering temperature, : the oscillating pressure is applied until the end of the holding time, wherein the mean | value of the oscillating pressure is 10-50 MPa, the amplitude is +1-5 MPa, and the | oscillating frequency is 1-10Hz. |
[0015] Further, step (3) further includes placing the graphite pressing mold filled | with a sample onto a pressure workbench in the chamber of the oscillating pressure | sintering furnace for pre-loading before sample sintering to let pressure act on the pressing | mold, then closing the furnace chamber, and performing vacuuming. |
[0016] Further, step (3) further includes letting the furnace chamber of the | sintering furnace to naturally cool down to room temperature along with the sintering | furnace, opening a door of the furnace chamber by breaking vacuum, removing a pressure | head to remove a pressure on the graphite pressing mold, and taking out the mold to obtain | the product which is the sample in the mold. |
[0017] Further, an inert gas is introduced for protection during the oscillating | pressure sintering process. |
[0018] Further, in step (2), the graphite pressing mold is placed in a cold press and | then is subjected to pre-pressing forming at the pressure of 10 Mpa for 3 mins. |
[0019] Further, in step (1), the tungsten powder used has 99.9% purity with 3-4 | um particle size; the copper powder has a particle size of 1-2 um; and the prefabricated | powder is obtained using a high-energy ball mill by mixing and dispersion. |
[0020] Compared with the prior art, the has the following beneficial effects: The | present application provides a method for preparing the high-densification | tungsten-copper refractory alloy. The oscillating pressure sintering approach is | adjusted, and sintering process parameters such as the sintering time, temperature | rising rate, sintering temperature, pressure value, amplitude and frequency are . regulated, such that the tungsten-copper alloy is subjected to a multi-field coupling | reaction of a heat field and a force field in the insulating graphite mold to form a : copper mesh by melted and solidified and then filled in gaps between tungsten | particles. And the circulating pressure could drive powder to be re-arranged, liquid | phase to be flowed, and next hole to be discharged. Finally the high-densification | refractory alloy could be obtained . The obtained alloy basically reaches the | theoretical densification. Moreover, the tungsten-copper refractory alloy prepared by | the present application performs melting and solidification reactions only, and the | precipitated phase is simple. | BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS |
[0021] FIG. 1 is a statistical diagram of the relative density of a high-densification tungsten-copper refractory alloy which was prepared by a method according to present | invention under the conditions of 30 MPa oscillating pressure, +5 MPa amplitude, 1 Hz 4 frequency, 1h holding time of temperature insulation for oscillating pressure sintering, and | LU102169 ( 900-1200°C temperature; |
[0022] FIG. 2 is a statistical diagram of the relative density of a high-densification | tungsten-copper refractory alloy which was prepared by traditional hot pressing sintering | under the conditions of 900-1400°C temperature, 30 MPa pressure and 1 h holding time of | temperature insulation for sintering; |
[0023] FIGs. 3 (a), 3 (b), 3 (c) and 3 (d) are microstructures of alloys which were | prepared according to the method of the present application under conditions of 1000°C, | 1050°C, 1080°C and 1100°C temperatures, 30 MPa oscillating pressure, +5 MPa | amplitude, 10 Hz frequency, 1h holding time of temperature insulation for oscillating | pressure sintering, respectively; |
[0024] FIGs. 4 (a), 4 (b), 4 (c) and 4 (d) are microstructures of alloys which were / prepared by traditional hot pressing sintering under the conditions of 1100°C, 1200°C, : 1300°C and 1400°C temperatures, 30 MPa pressure and 1h holding time of temperature | insulation for sintering, respectively. |
[0025] The following describes the present application in further detail in | conjunction with the accompanying drawings and specific embodiments. It needs to be | noted that, on the premise of no conflicts, the embodiments or technical characteristics | described below can be combined in any way to form new embodiments. |
[0026] Embodiment 1 |
[0027] A method for preparing a high-densification tungsten-copper refractory alloy includes the following steps:
[0028] (1) mixing and dispersing tungsten powder with purity of 99.9% and a particle size of 3-4 um and copper powder with a particle size of 1-2 um using a high 5 energy ball mill to obtain prefabricated powder, wherein the mass percent of the tungsten | powder was 90%, and the mass percent of the copper powder was 10%; and placing the L prefabricated powder in a high-purity graphite pressing mold coated with a boron nitride | coating; |
[0029] (2) placing the graphite pressing mold in step (1) into a cold press, ; adjusting the pressure to10 Mpa, and performing pre-pressing molding for 3 mins; |
[0030] (3) placing the graphite pressing mold, which was filled with a sample after : the cold pressing molding in step (2), onto a pressure workbench in the chamber of the ; oscillating pressure sintering furnace, adjusting the position of the mold until the mold | was completely centered, driving an upper press head to move downward towards the | mold and stopping the upper press head until it was about to touch the mold through a | control panel of the oscillating pressure sintering furnace, performing preloading to let A pressure act on the pressing mold, then closing the furnace chamber, and vacuuming the | furnace chamber to a working vacuum degree; |
[0031] Adjusting and setting heating process parameters through the control panel, ) wherein sintering was carried out with the argon gas protection, the temperature rising rate | during sintering was 8°C/min, the sintering temperature was 1050°C, and the holding time | was lh; when the temperature reached the sintering temperature, applying the oscillating | pressure until the end of the holding time, wherein the mean value of the oscillating | pressure was 20 MPa, the amplitude was +3 MPa, and the oscillating frequency was 5 Hz; |
[0032] After the holding time was over, letting the furnace chamber of the | sintering furnace to naturally cool down to room temperature along with the sintering | furnace, opening a door of the furnace chamber by breaking vacuum, removing the | pressure head to remove the pressure on the graphite pressing mold, and taking out the | mold to obtain the product which was the sample in the mold. |
[0033] Embodiment 2 |
[0034] A method for preparing a high-densification tungsten-copper refractory | alloy includes the following steps: |
[0035] (1) mixing and dispersing tungsten powder with purity of 99.9% and a | particle size of 3-4 um and copper powder with a particle size of 1-2 um using a high | energy ball mill to obtain prefabricated powder, wherein the mass percent of the tungsten | powder was 90%, and the mass percent of the copper powder was 10%; and placing the | prefabricated powder in a high-purity graphite pressing mold coated with a boron nitride | coating; ;
[0036] (2) placing the graphite pressing mold in step (1) into a cold press, : adjusting the pressure to10 Mpa, and performing pre-pressing molding for 3 mins; |
[0037] (3) placing the graphite pressing mold, which was filled with a sample after , the cold pressing molding in step (2), onto a pressure workbench in the chamber of the à oscillating pressure sintering furnace, adjusting the position of the mold until the mold ’ was completely centered, driving an upper press head to move downward towards the À mold and stopping the upper press head until it was about to touch the mold through a . control panel of the oscillating pressure sintering furnace, performing preloading to let | pressure act on the pressing mold, then closing the furnace chamber, and vacuuming the . furnace chamber to a working vacuum degree; |
[0038] Adjusting and setting heating process parameters through the control panel, | wherein sintering was carried out with the argon gas protection, the temperature rising rate | during sintering was 8°C/min, the sintering temperature was 1080°C, and the holding time | was lh; when the temperature reached the sintering temperature, applying an oscillating | pressure until the end of the holding time, wherein the mean value of the oscillating | pressure was 30 MPa, the amplitude was +5 MPa, and the oscillating frequency was 10 |
[0039] After the holding time was over, letting the furnace chamber of the | sintering furnace to naturally cool down to room temperature along with the sintering LU102169 . furnace, opening a door of the furnace chamber by breaking vacuum, removing the ; pressure head to remove the pressure on the graphite pressing mold, and taking out the , mold to obtain the product which was the sample in the mold. ,
[0040] Embodiment 3
[0041] A method for preparing a high-densification tungsten-copper refractory | alloy includes the following steps: :
[0042] (1) mixing and dispersing tungsten powder with purity of 99.9% and a Ë particle size of 3-4 um and copper powder with a particle size of 1-2um using a high | energy ball mill to obtain prefabricated powder, wherein the mass percent of the tungsten | powder was 90%, and the mass percent of the copper powder was 10%; and placing the | prefabricated powder in a high-purity graphite pressing mold coated with a boron nitride . coating;
[0043] (2) placing the graphite pressing mold in step (1) into a cold press, | adjusting the pressure tol 0Mpa, and performing pre-pressing molding for 3 mins; .
[0044] (3) placing the graphite pressing mold, which was filled with a sample after A the cold pressing molding in step (2), onto a pressure workbench in the chamber of the | oscillating pressure sintering furnace, adjusting the position of the mold until the mold was completely centered, driving an upper press head to move downward towards the | mold and stopping the upper press head until it was about to touch the mold through a | control panel of the oscillating pressure sintering furnace, performing preloading to let | pressure act on the pressing mold, then closing the furnace chamber, and vacuuming the | furnace chamber to a working vacuum degree; |
[0045] Adjusting and setting heating process parameters through the control panel, wherein sintering was carried out with the argon gas protection, the temperature rising rate | during sintering was 8°C/min, the sintering temperature was 1100°C, and the holding time | was 2h; when the temperature reached the sintering temperature, applying an oscillating | pressure until the end of the holding time, wherein the mean value of the oscillating | pressure was 30 MPa, the amplitude was £5 MPa, and the oscillating frequency was 10 A
[0046] After the holding time was over, letting the furnace chamber of the | sintering furnace to naturally cool down to room temperature along with the sintering | furnace, opening a door of the furnace chamber by breaking vacuum, removing the | pressure head to remove the pressure on the graphite pressing mold, and taking out the Ë mold to obtain the product which was the sample in the mold. |
[0047] Embodiment 4 È
[0048] A method for preparing a high-densification tungsten-copper refractory | alloy includes the following steps: |
[0049] (1) mixing and dispersing tungsten powder with purity of 99.9% and a ‘ particle size of 3-4 um and copper powder with a particle size of 1-2 um using a high | energy ball mill to obtain prefabricated powder, wherein the mass percent of the tungsten | powder was 90%, and the mass percent of the copper powder was 10%; and placing the | prefabricated powder in a high-purity graphite pressing mold coated with a boron nitride | coating; |
[0050] (2) placing the graphite pressing mold in step (1) into a cold press, | adjusting the pressure to10 Mpa, and performing pre-pressing molding for 3 mins; |
[0051] (3) placing the graphite pressing mold, which was filled with a sample after | the cold pressing molding in step (2), onto a pressure workbench in the chamber of the | oscillating pressure sintering furnace, adjusting the position of the mold until the mold | was completely centered, driving an upper press head to move downward towards the | mold and stopping the upper press head until it was about to touch the mold through a | control panel of the oscillating pressure sintering furnace, performing preloading to let | pressure act on the pressing mold, then closing the furnace chamber, and vacuuming the | LU102169 Ÿ furnace chamber to a working vacuum degree; |
[0052] Adjusting and setting heating process parameters through the control panel, wherein sintering was carried out with the argon gas protection, the temperature rise rate | during sintering was 8°C/min, the sintering temperature was 1200°C, and the holding time | was 0.5h; when the temperature reached the sintering temperature, applying an oscillating | pressure until the end of the holding time, wherein the mean value of the oscillating pressure was 10 MPa, the amplitude was +2 MPa, and the oscillating frequency was 2 Hz; À
[0053] After the holding time was over, letting the furnace chamber of the | sintering furnace to naturally cool down to room temperature along with the sintering . furnace, opening a door of the furnace chamber by breaking vacuum, removing the ; pressure head to remove the pressure on the graphite pressing mold, and taking out the .
mold to obtain the product which was the sample in the mold. .
[0054] Comparison example |
[0055] A comparison example provides a method for preparing a tungsten-copper | alloy. A traditional hot pressing sintering process was adopted to prepare tungsten-copper | alloy under the conditions of 900-1400°C temperature, 30 MPa pressure and 1h holding | time of temperature insulation for sintering. .
[0056] A draining method was adopted to analyze the density of the sintered | sample. FIG. 1 is a statistical diagram of the relative density of the high-densification | tungsten-copper refractory alloy which was prepared by the present application under the | conditions of 30 MPa oscillating pressure, £5 MPa amplitude, 1Hz frequency, 1h holding | time of temperature insulation for oscillating pressure sintering, and 900-1200°C | temperature. FIG. 2 is a statistical diagram of the relative density of the high-densification | tungsten-copper refractory alloy which was prepared by traditional hot pressing sintering | under the conditions of 900-1400°C temperature, 30 MPa pressure and 1h holding time of | temperature insulation for sintering. FIGs. 3 (a), 3 (b), 3 (c) and 3 (d) are microstructure | pictures of the alloys which were prepared according to the method of the present | application under conditions of 1000°C, 1050°C, 1080°C and 1100°C temperatures, 30 | MPa oscillating pressure, +5 MPa amplitude, 10Hz frequency, 1h holding time of | temperature insulation for oscillating pressure sintering, respectively. FIGs. 4 (a), 4 (b), 4 | (c) and 4 (d) are microstructure pictures of alloys which were prepared by traditional hot | pressing sintering under the conditions of 1100°C, 1200°C, 1300°C and 1400°C | temperatures, 30 MPa pressure and 1h holding time of temperature insulation for sintering, | respectively. .
[0057] From FIG. 1 and FIG. 3 it can be seen that, the tungsten-copper alloy . prepared by the method of the present application has a relatively low density at the | temperature of 900-1000°C and a relatively high density at the temperature of | 1050-1200°C, and had a relatively low porosity, and the relative density of the sample also . increased as the temperature rose, and reached over 99.4% at the temperature of 1080°C, | which means basically complete identification; and at temperature of over 1100°C, the | relative density could be kept at around 99%, indicating a good identification effect. From | FIG. 2 and FIG. 4 it can be seen that, the sample obtained by the traditional hot pressing | sintering method had a relative density which increased as the sintering temperature rose, | below 90% when the temperature was below 1200°C; the relative density of the sample | reached 99% at the sintering temperature of 1400°C, which was higher than the oscillating | pressure sintering temperature of the present application shown in FIG. 1. Moreover, there | was a great difference between the relative densities of the samples obtained by hot | pressing sintering at a low temperature and at a high temperature in the same sintering | time, and the relative densities of the samples obtained by hot pressing sintering at a | temperature of 1050-1200°C were all lower than the relative density of the sample | obtained by oscillating pressure sintering according to the present application. The effect | of the alloys obtained by hot pressing sintering is inferior to that the alloy obtained by | LU102169 | oscillating pressure sintering according to the present application.
[0058] The above embodiments are merely preferred embodiments of the present | application, and shall not be construed limiting the protective scope of the present | application. Any non-substantial changes and substitutions made by those skilled in the art | on the basis of the present application shall fall within the protective scope of the present | application. |
Claims (9)
1. A method for preparing a high-densification tungsten-copper refractory alloy, | characterized by comprising the following steps: | (1) placing prefabricated powder obtained after mixing tungsten powder and copper | powder into a high-purity graphite pressing mold coated with a boron nitride coating; À (2) forming the graphite pressing mold in step (1) by cold pressing; | (3) placing the graphite pressing mold which is filled with samples after cold pressing | in step (2) into the chamber of an oscillating pressure sintering furnace for sintering to | obtain the finished product. |
2. The method for preparing a high-densification tungsten-copper refractory alloy | according to claim 1, wherein in step (1), the mass percent of the tungsten powder is 90%, | and the mass percent of the copper powder is 10%. ;
3. The method for preparing a high-densification tungsten-copper refractory alloy | according to claim 1, wherein in step (3), the temperature rising rate for sintering is ; 8°C/min; the sintering temperature is 1050-1200°C; and the holding time is 0.5-2h. |
4. The method for preparing a high-densification tungsten-copper refractory alloy . according to claim 3, wherein in step (3), when the temperature reaches the sintering | temperature, the oscillating pressure is applied until the end of the holding time, wherein | the mean value of the oscillating pressure is 10-50 MPa, the amplitude is +1-5 MPa, and | the oscillating frequency is 1-10 Hz. |
5. The method for preparing a high-densification tungsten-copper refractory alloy | according to claim 4, wherein step (3) further comprises placing the graphite pressing | mold filled with a sample onto a pressure workbench in the chamber of the oscillating . pressure sintering furnace for pre-loading before sample sintering to let pressure act on the | pressing mold, then closing the furnace chamber, and performing vacuuming. |
6. The method for preparing a high-densification tungsten-copper refractory alloy | according to claim 4, wherein step (3) further comprises letting the furnace chamber of the . LU102169 |.
sintering furnace to naturally cool down to room temperature along with the sintering | furnace, opening a door of the furnace chamber by breaking vacuum, removing a pressure | head to remove a pressure on the graphite pressing mold, and taking out the mold to obtain | the product which is the sample in the mold. |
7. The method for preparing a high-densification tungsten-copper refractory alloy | according to claim 4, wherein an inert gas is introduced for protection during the | oscillating pressure sintering process. |
8. The method for preparing a high-densification tungsten-copper refractory alloy | according to claim 1, wherein in step (2), the graphite pressing mold is placed in a cold | press and then is subjected to pre-pressing forming at the pressure of 10 Mpa for 3 mins. |
9. The method for preparing a high-densification tungsten-copper refractory alloy | according to claim 1, wherein in step (1), the tungsten powder used has 99.9% purity | and a 3-4 um particle size; the copper powder has a particle size of 1-2 pm; and the | prefabricated powder is obtained using a high-energy ball mill by mixing and dispersion. |
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| CN114619028A (en) * | 2022-03-18 | 2022-06-14 | 郑州大学 | Diamond/copper composite material and preparation method thereof |
| CN115677353A (en) * | 2022-11-02 | 2023-02-03 | 无锡海古德新技术有限公司 | Aluminum nitride-based conductive ceramic and preparation method thereof |
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| JPS60215701A (en) * | 1984-04-11 | 1985-10-29 | Inoue Japax Res Inc | Sintering device using ultrasonic wave |
| JP2004149813A (en) * | 2002-10-28 | 2004-05-27 | Nippon Tungsten Co Ltd | High density material, and production method therefor |
| CN103526060B (en) * | 2013-10-09 | 2016-06-22 | 昆明理工大学 | A kind of fast preparation method of copper-tungsten |
| CN107062891A (en) * | 2017-04-13 | 2017-08-18 | 株洲新融利实业有限公司 | One kind vibration hot-pressed sintering furnace |
-
2020
- 2020-01-08 CN CN202010015880.5A patent/CN111020334B/en not_active Expired - Fee Related
- 2020-11-02 LU LU102169A patent/LU102169B1/en active IP Right Grant
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| CN111020334A (en) | 2020-04-17 |
| CN111020334B (en) | 2020-10-20 |
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