CN110079691A - A kind of low molybdenum content molybdenum-copper and preparation method thereof - Google Patents
A kind of low molybdenum content molybdenum-copper and preparation method thereof Download PDFInfo
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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
- B22F1/14—Treatment of metallic powder
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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
- B22F3/02—Compacting only
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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
- B22F3/1017—Multiple heating or additional 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
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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
- C22C1/0425—Copper-based alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
Abstract
The invention discloses a kind of low molybdenum content molybdenum-coppers and preparation method thereof.The preparation method of the low molybdenum content molybdenum-copper includes: molybdenum powder processing step: molybdenum powder progress air-flow being crushed, soilless sticking molybdenum powder is obtained；Mist projection granulating step: adding water, binder, stir to get distributed slurry later in Xiang Suoshu soilless sticking molybdenum powder, copper powder, the distributed slurry is prepared as spherical molybdenum copper powders using spray granulation later；Automatic pressing step: the spherical molybdenum copper powders are subjected to automatic compression moulding, obtain green compact；Dumping step: the binder in the green compact is removed, blank is obtained；Sintering step: the blank is sintered, molybdenum-copper is obtained.This method has that high-efficient, compactness is high, even tissue, consistency are good, high yield rate and other effects.
Description
Technical field
The present invention relates to refractory metal powder metallurgical technologies, more particularly to a kind of low molybdenum content molybdenum-copper and its preparation
Method.
Background technique
" the vacation conjunction that Mo-Cu composite material is made of the copper of the high-intensitive, molybdenum of low thermal coefficient of expansion and electric-conductivity heat-conductivity high
Gold ".Although Mo/Cu alloy has lower thermal conductivity and density, and the fusing point of Mo, hardness compare W compared with W/Cu alloy
Low, this makes composite material of molybdenum and copper be easier sintering and working process, and therefore, the application of molybdenum copper product is more extensive.
Mixed powder sintering method is to prepare the most common method of composite material of molybdenum and copper.The sintering process and tungsten copper material of molybdenum copper product
That expects is very close, is to mix molybdenum powder and copper powder in proportion, suppress, then sinters Mo/Cu blank into, and can be according to molybdenum
The difference of copper proportion uses different sintering temperatures, and sintering temperature is generally 1300~1500 DEG C.For the molybdenum copper of low molybdenum content
Material can mix powder using mechanical alloying method, and materials are high-energy ball milling powder, can get high-compactness, metastable phase, standard
Brilliant, the widened molybdenum-copper of mutual solubility.
However, due to molybdenum copper powders large viscosity, the features such as micro-shape is complicated, molybdenum copper powders are difficult to be mixed thoroughly,
Molybdenum-copper inside after sintering is caused to be reunited.And molybdenum copper powders compression moulding is poor, pressure is distributed not during die mould
Uniformly, alloying component after sintering is caused to be segregated.And mixed powder sintering method work consuming is time-consuming, and sintering temperature is high, obtained molybdenum copper
The defects of alloy has been easy reunion, hole, segregation.
Summary of the invention
In view of the shortcomings of the prior art and defect, one of the objects of the present invention is to provide a kind of low molybdenum content molybdenum copper
The preparation method of alloy overcomes existing preparation method at high cost, low efficiency, product quality to fluctuate big disadvantage.
The second object of the present invention is to provide a kind of even tissue, compactness height, the good low molybdenum content of consistency of performance
Molybdenum-copper solves the problem of that existing low molybdenum content molybdenum-copper nonuniform organization performance is difficult to be completely secured.
The technical proposal for solving the technical problem of the invention is as follows:
A kind of preparation method of low molybdenum content molybdenum-copper, comprising:
Molybdenum powder processing step: molybdenum powder progress air-flow is crushed, soilless sticking molybdenum powder is obtained；
Mist projection granulating step: add water, binder in Xiang Suoshu soilless sticking molybdenum powder, copper powder, stir to get distributed slurry later
(obtained slurry more dry-mixed than tradition is more evenly), the distributed slurry is prepared as spherical molybdenum copper powder using spray granulation later
End；
Automatic pressing step: the spherical molybdenum copper powders are subjected to automatic compression moulding, obtain green compact；
Dumping step: the binder in the green compact is removed, blank is obtained；
Sintering step: the blank is sintered, molybdenum-copper is obtained.
In the preparation method of above-mentioned low molybdenum content molybdenum-copper, as a preferred implementation manner, at the molybdenum powder
It manages in step, the Fisher particle size of the molybdenum powder is 3.0~4.0 μm, and apparent density is 1.0~1.3g/cm3.Molybdenum used in the present invention
Powder can guarantee the compactness of material and prepare the performance of product, and have suitable price.
In the preparation method of above-mentioned low molybdenum content molybdenum-copper, made by spraying described as a preferred implementation manner,
In grain step, the Fisher particle size of the copper powder is 3.0~4.0 μm, and apparent density is 2.0~3.0g/cm3, the molybdenum powder and copper
The Fisher particle size of powder may make in the two mixing, be more easier to be uniformly mixed；Preferably, the soilless sticking molybdenum powder: copper powder
Mass ratio is 1:9~1:1, and the additional amount of the water is the 10%~30% of the soilless sticking molybdenum powder and the copper powder gross mass,
If amount of water is excessive, drying is insufficient during will cause mist projection granulating, if amount of water is very few, it is heavy when stirring to will lead to
Bottom, so that being blocked when spraying in pipeline and nozzle and granulation process since tension is not enough granulated failure；It is described viscous
Tie 1%~3% that agent additive amount is the soilless sticking molybdenum powder and the copper powder gross mass.
In the preparation method of above-mentioned low molybdenum content molybdenum-copper, made by spraying described as a preferred implementation manner,
In grain step, nozzle diameter used is 0.8mm~1.1mm in the spray granulation, and pressure suffered by the distributed slurry is
900KPa~1200KPa, wherein if the excessive throughput that will increase slurry of pressure, insufficient so as to cause drying, in addition, pressure
The strong excessive slurry that will lead to is stained with spraying tower top；If pressure is too low to will lead to spray nozzle clogging, and when pressure is low, to will cause slurry logical
Excessive low and corresponding yield is lower；Drying temperature is 150 DEG C~180 DEG C, and the diameter of the spherical shape molybdenum copper powders is 50 μm
~200 μm；The present invention uses the big nozzle of diameter and lesser pressure, can prevent spray nozzle clogging, and the droplet sprayed is big, thus
Obtained spherical powder is relatively large in diameter.
In the preparation method of above-mentioned low molybdenum content molybdenum-copper, as a preferred implementation manner, described from dynamic pressure
In step processed, the automatic compacting is carried out using full-automatic forming press；Preferably, the pressure suppressed automatically is 50 tons~80
Ton, frequency are 10Hz~20Hz；It is 50 tons~60 ton hours, the full-automatic forming press of use in the pressure suppressed automatically
For the full-automatic powder pressing machine of the 0PC-60TG model of Nanjing Dong Tian precision machinery Co., Ltd production；Automatically the pressure suppressed
Power is 60~80 ton hours, and the structure of used full-automatic forming press is the full-automatic powder pressing machine to the 0PC-60TG model
The transformation of progress, the maximum pressure being capable of providing are 80 tons.
In the preparation method of above-mentioned low molybdenum content molybdenum-copper, walked as a preferred implementation manner, in the dumping
In rapid, the dumping step (removal of binder) is to carry out in pushing away boat furnace, it is preferable that the atmosphere pushed away in boat furnace is hydrogen
Gas, wherein the reducing atmosphere that hydrogen provides can guarantee that molybdenum copper is not oxidized, and if be will increase into using vacuum and nitrogen
This, and prevent the effect of oxidation good not as good as hydrogen of the invention；The temperature for pushing away boat furnace be 500 DEG C~700 DEG C (for example,
520 DEG C, 540 DEG C, 560 DEG C, 580 DEG C, 600 DEG C, 620 DEG C, 640 DEG C, 660 DEG C, 680 DEG C), speed is 5Hz~10Hz, when dumping
Between be 2~4 hours (such as 2.5 hours, 3 hours, 3.5 hours, the dumping time are the time at 500 DEG C~700 DEG C),
If the temperature for pushing away boat furnace is too low, glue (i.e. binder) is not volatile, the too high then waste of energy of temperature；If pushing away the speed of boat furnace too
Dumping can be made to be not thorough fastly, speed then will increase very much cost slowly.
In the preparation method of above-mentioned low molybdenum content molybdenum-copper, walked as a preferred implementation manner, in the sintering
In rapid, the sintering processes are to carry out in pushing away boat furnace, and the atmosphere pushed away in boat furnace is hydrogen, and the temperature for pushing away boat furnace is
950 DEG C~1050 DEG C (for example, 980 DEG C, 1000 DEG C, 1020 DEG C, 1040 DEG C), speed is 20Hz~30Hz, the sintering time
For 40 minutes~1 hour (such as 45 minutes, 50 minutes, 55 minutes, the sintering time be at 950 DEG C~1050 DEG C when
Between).Wherein, if the temperature for the pushing away boat furnace temperature that is used to be sintered is too high, it will appear liquid phase, and liquid-phase sintering can be such that material causes
Density reduces, and temperature height also will cause energy waste；Sintering temperature is low, sintering driving force can be made inadequate, to cause material
Material combination is insecure, performance is poor；If the excessive velocities for pushing away boat furnace can make to be sintered incomplete, low in conjunction with not close, consistency and produce
Moral character can be poor；Speed can then reduce efficiency, waste of energy slowly excessively, can also make crystal grain grow up and properties of product be deteriorated.
A kind of low molybdenum content molybdenum-copper, the low molybdenum content molybdenum-copper are using above-mentioned low molybdenum content molybdenum-copper
Preparation method is prepared.
The present invention has following good effect compared with prior art:
(1) the invention discloses a kind of low molybdenum content molybdenum-copper preparation method, molybdenum powder used is crushed to beat by air-flow
Broken reunion enables to be sufficiently mixed when mixing with copper powder, to make sintering gained molybdenum-copper even tissue.
(2) present invention obtains molybdenum copper mixed-powder using spray granulation.Firstly, molybdenum copper powder adds water to mix, reduce
Frictional force between two kinds of powder mixes molybdenum powder with copper powder more uniform.Then, it is obtained using Spray granulation method
Spherical powder good fluidity can be used for automatic forming press, improve production efficiency and alloy property consistency.Finally, using spray
The spherical molybdenum copper mixed-powder that mist prilling process obtains, compression moulding performance is good, carried out using automatic forming press it is larger unidirectional
The case where pressure is unevenly distributed will not occur in pressure compacting, so as to avoid component segregation.
(3) present invention suppresses molybdenum copper green compact using automatic forming press, improves production efficiency and properties of product consistency.From
Dynamic pressure type machine can provide larger pressure, obtain the higher green compact of density, then just has higher surface potential energy between powder, to make
Sintering temperature reduces, and sintering time shortens.
(4) there is the process of a dumping in the present invention, in removing green compact while colloid, there is impurity in removal alloy
The defects of effect avoids impurity when direct sintering from causing stomata, and structure is uneven.
(5) use of the invention pushes away boat furnace infiltration, walks boat automatically, alloy property consistency is good, and sintering temperature is low, the time used
It is short, improve production efficiency.
(6) present invention has fully considered the stomata being likely to occur in low molybdenum content molybdenum-copper, reunion, nonuniform organization etc.
Defect can prepare even tissue, the high low molybdenum content molybdenum-copper of consistency.
(7) the present invention overcomes the low efficiency of existing preparation process, that production process is complicated, product quality fluctuation is big etc. is several
Shortcoming and deficiency, the method illustrated using the present invention improve production efficiency, and the molybdenum-copper performance produced with the method
Consistency is good, high yield rate.
Detailed description of the invention
More clearly to describe the present invention, here in connection with attached drawing, the present invention is further described.Wherein:
Fig. 1 is the metallograph after molybdenum-copper surface polishing prepared by embodiment 1, and light tone region is molybdenum in figure, remaining
For copper.
Specific embodiment
It is further to the present invention below with reference to embodiment in order to protrude expression the objectives, technical solutions, and advantages of the present invention
Illustrate, embodiment is not intended to limit the present invention for explanation of the invention.
The preparation of embodiment 1Mo50Cu50 alloy, comprising steps of
1, molybdenum powder is handled
Preparing Fisher particle size is 4.0 μm, apparent density 1.3g/cm3Molybdenum powder, be crushed crusher machine by air-flow, obtain
Soilless sticking molybdenum powder.
2, mist projection granulating
Taking Fisher particle size is 4.0 μm, apparent density 3.0g/cm3Superfine cupper powder, the molybdenum powder with the soilless sticking of step 1,
Water and PEG20000 binder is added to be mixed into slurry.Wherein: soilless sticking molybdenum powder: the mass ratio of copper powder is 1:1, and the additional amount of water is
The 25% of soilless sticking molybdenum powder and copper powder gross mass；Content of binder is the 3% of soilless sticking molybdenum powder and copper powder gross mass.Slurry exists
Spray drying granulation is carried out under nitrogen protective atmosphere, wherein nozzle diameter used in mist projection granulating is 1.1mm, pressure suffered by slurry
For 1200KPa, drying temperature is 180 DEG C, and 150 μm~200 μm of diameter of spherical molybdenum copper powder is obtained after dry.
3, compression moulding
Spherical molybdenum copper powder prepared by step 3 uses automatic forming press die mould, and the pressure of automatic forming press is 50 tons, and speed is
20Hz obtains green compact；Wherein, automatic forming press is the complete of the 0PC-60TG model of Nanjing Dong Tian precision machinery Co., Ltd production
Autoamtic powder press, the die mould process of automatic forming press die mould specifically: feeding warehouse is added in spherical molybdenum copper powder by 1；In 2 feeding warehouses
Spherical molybdenum copper powder mold is flowed by pipeline by gravity；3 machines (automatic forming press) are according to the speed and pressure set
Power is suppressed, and (pressing time of each single-piece is 1s, dwell time 1s, release and is unloaded for compacting 20 per minute herein
Expect that time (discharge time is the time during automatic demoulding) is 1s), pressure 50t；4 automatic demouldings；5 circulation 2-4 processes.
4, green compact dumping
Green compact prepared by step 3, which is fitted into, pushes away dumping in boat furnace, and atmosphere is hydrogen, and 700 DEG C of temperature, speed 5Hz, when dumping
Between be 4 hours, obtain blank.
5, it is sintered
Blank is fitted into push away and is sintered in boat furnace, atmosphere is hydrogen, and 1050 DEG C of temperature, speed 20Hz, sintering time is 1 small
When.
Attached drawing 1 is the metallograph after the Mo50Cu50 alloy surface polishing of this method production, and bright part is molybdenum in figure,
Dark part is copper.From metallographic as can be seen that using this method produce Mo50Cu50 alloy, pore-free closed pore, soilless sticking and
Nonuniform organization phenomenon.
The Mo50Cu50 alloy of φ 15*8mm is produced by this method, up to 600kg, consistency is reachable for a weekly production
99%, inspect 5 finished products by random samples, as a result such as the following table 1:
Table 1
| Number | Diameter/mm | Highly/mm | Density/g*cm-3 |
| 1 | 15.00 | 8.00 | 9.54 |
| 2 | 15.00 | 8.00 | 9.54 |
| 3 | 14.99 | 8.02 | 9.53 |
| 4 | 15.00 | 8.00 | 9.54 |
| 5 | 15.01 | 8.00 | 9.54 |
From above-mentioned 1 result of table as it can be seen that molybdenum-copper of the present invention has, high-efficient, compactness is high, even tissue, consistency
Good, high yield rate and other effects.
The preparation of embodiment 2Mo30Cu70 alloy
1, molybdenum powder is handled
Preparing Fisher particle size is 3.5 μm, apparent density 1.2g/cm3Molybdenum powder, be crushed crusher machine by air-flow, obtain
Soilless sticking molybdenum powder.
2, mist projection granulating
Taking Fisher particle size is 3.5 μm, apparent density 2.5g/cm3Superfine cupper powder, the soilless sticking molybdenum powder with step 1 adds
Water and PEG20000 binder are mixed into slurry.Wherein: soilless sticking molybdenum powder: the mass ratio of copper powder is 3:7, and the additional amount of water is nothing
The 20% of reunion molybdenum powder and copper powder gross mass；Content of binder is the 2% of soilless sticking molybdenum powder and copper powder gross mass.Slurry is in nitrogen
Spray drying granulation is carried out under gas shielded atmosphere, wherein nozzle diameter used in mist projection granulating is 0.96mm, and slurry pressure is
1050KPa, drying temperature are 165 DEG C, and 100 μm~150 μm of diameter of spherical molybdenum copper powder is obtained after dry.
3, compression moulding
Spherical molybdenum copper powder prepared by step 3 uses automatic forming press die mould, and the pressure of automatic forming press is 65 tons, and speed is
15Hz obtains green compact；Wherein automatic forming press is the 0PC-60TG model to the production of Nanjing Dong Tian precision machinery Co., Ltd
The transformation that full-automatic powder pressing machine carries out, can provide the pressure of 65t.
Detailed process when being suppressed using automatic forming press are as follows: feeding warehouse is added in spherical molybdenum copper powder by 1；Ball in 2 feeding warehouses
Shape molybdenum copper powder is flowed into mold by pipeline by gravity；3 machines (automatic forming press) according to the speed that sets and pressure into
Row compacting, compacting 15 per minute herein, (each single-piece pressing time is 1.5s to pressure 65t, and dwell time 1.5s is unloaded
Pressure and discharge time (discharge time is the time during automatic demoulding) are 1s)；4 automatic demouldings；5 circulation 2-4 processes.
4, green compact dumping
Green compact prepared by step 3, which is fitted into, pushes away dumping in boat furnace, and atmosphere is hydrogen, and 600 DEG C of temperature, speed 7Hz, when dumping
Between be 3 hours, obtain blank.
5, it is sintered
Blank is fitted into push away and is sintered in boat furnace, atmosphere is hydrogen, and 1000 DEG C of temperature, speed 25Hz, sintering time is
50min。
The Mo30Cu70 alloy of φ 15*8mm is produced by this method, consistency inspects 5 finished products, diameter by random samples up to 99%
Range is 15.00 ± 0.01mm, and altitude range is 8.00 ± 0.02mm, and density is up to 9.25g/cm3
The preparation of embodiment 3Mo10Cu90 alloy
1, molybdenum powder is handled
Preparing Fisher particle size is 3.0 μm, apparent density 1.0g/cm3Molybdenum powder, be crushed crusher machine by air-flow, obtain
Soilless sticking molybdenum powder.
2, mist projection granulating
Taking Fisher particle size is 3.0 μm, apparent density 2.0g/cm3Superfine cupper powder, the soilless sticking molybdenum powder with step 1 adds
Water and binder are mixed into slurry.Wherein: soilless sticking molybdenum powder: the mass ratio of copper powder is 1:9, and the additional amount of water is soilless sticking molybdenum powder
With the 15% of copper powder gross mass；Content of binder is the 1% of soilless sticking molybdenum powder and copper powder gross mass.Slurry is in nitrogen protection
Spray drying granulation is carried out under atmosphere, wherein nozzle diameter used in mist projection granulating is 0.8mm, and slurry pressure is 1200KPa, dry
Temperature is 150 DEG C, and 50 μm~100 μm of diameter of spherical molybdenum copper powder is obtained after dry.
3, compression moulding
Spherical molybdenum copper powder prepared by step 3 uses automatic forming press die mould, and the pressure of automatic forming press is 80 tons, and speed is
10Hz obtains green compact；Wherein automatic forming press is the 0PC-60TG model to the production of Nanjing Dong Tian precision machinery Co., Ltd
The transformation that full-automatic powder pressing machine carries out, can provide the pressure of 80t.
Detailed process when being suppressed using automatic forming press are as follows: feeding warehouse is added in spherical molybdenum copper powder by 1；Ball in 2 feeding warehouses
Shape molybdenum copper powder is flowed into mold by pipeline by gravity；3 machines (automatic forming press) are according to the speed and pressure strength set
Wound compacting, compacting 15 per minute herein, (each single-piece pressing time is 2.5s to pressure 65t, and dwell time 2.5s is unloaded
Pressure and discharge time (discharge time is the time during automatic demoulding) are 1s)；4 automatic demouldings；5 circulation 2-4 processes.
4, green compact dumping
Green compact prepared by step 3, which is fitted into, pushes away dumping in boat furnace, and atmosphere is hydrogen, and 500 DEG C of temperature, speed 10Hz, dumping
Time is 2 hours, obtains blank.
5, it is sintered
Blank is fitted into push away and is sintered in boat furnace, atmosphere is hydrogen, 950 DEG C of temperature, speed 30Hz, sintering time 45min.
The Mo10Cu90 alloy of φ 15*8mm is produced by this method, consistency inspects 5 finished products, diameter by random samples up to 99%
Range is 15.00 ± 0.01mm, and altitude range is 8.00 ± 0.02mm, and density is up to 8.99g/cm3。
The φ 15*8mm Mo50Cu50 of 1 existing method of comparative example preparation
The preparation method process of existing Mo50Cu50 are as follows: 1, which weighs molybdenum, copper powders, closes in batch mixer batch (in V-type batch mixer
Dry-mixed 12h)；2 mix glue (glycide (the two volume ratio is 2:5)) and stir evenly；3 steel mold pressings (stainless steel mould compacting)
Molding, pressure 10t-12t；4 degummings, wherein degumming temperature is 700 DEG C, and the time is 4 hours；5 pre-burnings, specifically: at 960 DEG C
Heat preservation 1 hour；6 sintering, specifically: 3 hours are kept the temperature at 1080 DEG C.The Mo50Cu50 produced using existing Mo50Cu50 method,
Consistency 98% or so.
By the embodiment of the present invention 1 compared with comparative example 1, comparing result such as the following table 2:
Table 2
The comparison of embodiment 1 (the method for the present invention) and comparative example 1 (existing method) can be seen that the side of invention from upper table 1
Method has that high-efficient, compactness is high, even tissue, consistency are good, high yield rate and other effects；And method sintering temperature of the invention
Low, sintering time is short, the high material of still available consistency, it is theoretic the reason is as follows that, compared with existing method, this
Even if method has the following to guarantee that its sintering temperature is low in process of production, sintering time is short, and still available consistency is high
Material: 1 molybdenum powder is broken by air-flow, guarantees not reunite in powder；2 mixings are the slurry mixtures to add water, compared to dry-mixed, more
Be easy to be mixed it is even, especially copper it is this it is easy bonding agglomerate powder；3 spherical powders as made from mist projection granulating, compression moulding
Good, the powder of identical material, uniform pressure, spherical powder is easier densification, then by higher pressure, makes the stress of powder in green compact
Height, therefore lower temperature is only needed, the short period can complete to be sintered, and consistency is up to 99%.
Claims (8)
1. a kind of preparation method of low molybdenum content molybdenum-copper characterized by comprising
Molybdenum powder processing step: molybdenum powder progress air-flow is crushed, soilless sticking molybdenum powder is obtained；
Mist projection granulating step: add water, binder in Xiang Suoshu soilless sticking molybdenum powder, copper powder, stir to get distributed slurry later, later
The distributed slurry is prepared as spherical molybdenum copper powders using spray granulation；
Automatic pressing step: the spherical molybdenum copper powders are subjected to automatic compression moulding, obtain green compact；
Dumping step: the binder in the green compact is removed, blank is obtained；
Sintering step: the blank is sintered, molybdenum-copper is obtained.
2. the preparation method of low molybdenum content molybdenum-copper according to claim 1, which is characterized in that in molybdenum powder processing
In step, the Fisher particle size of the molybdenum powder is 3.0~4.0 μm, and apparent density is 1.0~1.3g/cm3。
3. the preparation method of low molybdenum content molybdenum-copper according to claim 1, which is characterized in that in the mist projection granulating
In step, the Fisher particle size of the copper powder is 3.0~4.0 μm, and apparent density is 2.0~3.0g/cm3；Preferably, the no group
Poly- molybdenum powder: the mass ratio of copper powder is 1:9~1:1, and the additional amount of the water is the soilless sticking molybdenum powder and the copper powder gross mass
10%~30%, the content of binder is the 1%~3% of the soilless sticking molybdenum powder and the copper powder gross mass.
4. the preparation method of low molybdenum content molybdenum-copper according to claim 1, which is characterized in that in the mist projection granulating
In step, nozzle diameter used is 0.8mm~1.1mm in the spray granulation, and pressure suffered by the distributed slurry is
900KPa~1200KPa, drying temperature are 150 DEG C~180 DEG C, and the diameter of the spherical shape molybdenum copper powders is 50 μm~200 μm.
5. the preparation method of low molybdenum content molybdenum-copper according to claim 1, which is characterized in that in the automatic compacting
In step, the automatic compacting is carried out using full-automatic forming press；Preferably, the pressure suppressed automatically is 50 tons~80
Ton, frequency are 10Hz~20Hz.
6. the preparation method of low molybdenum content molybdenum-copper according to claim 1, which is characterized in that in the dumping step
In, the dumping step is to carry out in pushing away boat furnace, it is preferable that the atmosphere pushed away in boat furnace is hydrogen, the boat furnace that pushes away
Temperature is 500 DEG C~700 DEG C, and speed is 5Hz~10Hz, and the dumping time is 2~4 hours.
7. the preparation method of low molybdenum content molybdenum-copper according to claim 1, which is characterized in that in the sintering step
In, the sintering processes are to carry out in pushing away boat furnace, and the atmosphere pushed away in boat furnace is hydrogen, and the temperature for pushing away boat furnace is
950 DEG C~1050 DEG C, speed is 20Hz~30Hz, and the time of the sintering is 40 minutes~1 hour.
8. a kind of low molybdenum content molybdenum-copper, which is characterized in that the low molybdenum content molybdenum-copper is using claim 1-7 institute
The preparation method for the low molybdenum content molybdenum-copper stated is prepared.
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| CN113385679A (en) * | 2021-06-17 | 2021-09-14 | 安徽寒锐新材料有限公司 | Method for preparing cobalt powder with high apparent density |
| CN115488330A (en) * | 2021-06-02 | 2022-12-20 | 华晴材料股份有限公司 | Method for producing copper pellet and copper pellet |
| CN115488330B (en) * | 2021-06-02 | 2024-05-10 | 华晴材料股份有限公司 | Method for producing copper particles and copper particles |
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| CN115488330B (en) * | 2021-06-02 | 2024-05-10 | 华晴材料股份有限公司 | Method for producing copper particles and copper particles |
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