CN106191611A - A kind of processing technique of Hardmetal materials - Google Patents
A kind of processing technique of Hardmetal materials Download PDFInfo
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- CN106191611A CN106191611A CN201610867407.3A CN201610867407A CN106191611A CN 106191611 A CN106191611 A CN 106191611A CN 201610867407 A CN201610867407 A CN 201610867407A CN 106191611 A CN106191611 A CN 106191611A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
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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
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
-
- 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
- B22F9/026—Spray drying of solutions or suspensions
-
- 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
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
The present invention relates to the processing technique of a kind of Hardmetal materials, it includes being carried out WC grain and Co grain respectively, removes surface impurity；WC grain and Co after cleaning are respectively crushed into powder；Again above-mentioned powder is ground after mix homogeneously in batch mixer, obtains alloyed powder；By extruded for above-mentioned alloyed powder, obtain Hardmetal materials；Again above-mentioned hard alloy is carried out heat treatment；By the hard alloy after heat treatment and liquid mixing, and add organic bond and stir, be configured to metal powder slurry；Again slurry is made powder by sponging granulator.The present invention can remove the impurity of metal powder surface by cleaning, improves the alloy purity of follow-up preparation, then can improve the mechanical activation of powder by the way of batch mixing and grinding, for the offer preferably basis of combining closely of alloy；Again WC Co alloyed powder is carried out hot pressed sintering and heat treatment, the Hardmetal materials of higher hardness and intensity can be obtained.
Description
Technical field
The technique that the present invention relates to Hardmetal materials.
Background technology
The consumption of mine, coal and oil drilling hard alloy is very big, and these rock drilling sintered-carbide tools are due to skill
The restriction of art, varies less for many years, and these changes are nothing but by precision controlling alloy degree of purity and Binder Phase composition etc..
Mine hard alloy instrument mainly uses WC-Co alloy at present.Generally, drilling well is used, coal mining is used and Colophonium cutting
WC and 6 11%Co is consisted of with the alloy on percussion drill bit, and the alloy of different purposes, because the raising of some performance is led
Cause the reduction of other performances.Toughness as usual in high-wear-resistant alloy is bad, otherwise, the Wear Resistance of good toughness is the best.Reduce
Co content and raising hardness can reduce alloy abrasion, and increase Co content and can improve impact flexibility with strengthening WC grain degree.
At present, the preparation of WC-Co alloy can use the technique such as laminating, sintering, and the WC-Co prepared by these techniques is hard
The WC grain of matter alloy is continuous distribution, and has the alloy of Co phase gradient, and thin brilliant side has higher hardness, coarse-grain side
There is certain bending strength；When sintering, Co phase migrates to thin brilliant side from coarse-grain side, and its hardness and intensity are not enough.With
Continually developing and applying of natural resources, the requirement to mine hard alloy is more and more higher, not only needs higher-strength, relatively
The sintered-carbide tool of good hardness.
Summary of the invention
For above-mentioned technical problem, the present invention provides a kind of and prepares the Hardmetal materials that hardness is relatively big, intensity is higher
Processing technique.
The technical solution used in the present invention is: the processing technique of a kind of Hardmetal materials, and it comprises the following steps:
(1) WC grain and Co grain are carried out respectively, remove surface impurity；
(2) WC grain and Co after cleaning are respectively crushed into powder；
(3) more above-mentioned powder is ground after mix homogeneously in batch mixer, obtains alloyed powder；
(4) above-mentioned alloyed powder is placed in extrusion die, more extruded by extruder, obtain Hardmetal materials；
(5) more above-mentioned Hardmetal materials is sintered and heat treatment；
(6) by the hard alloy after heat treatment and liquid mixing, and add organic bond and stir, be configured to metal powder pulp
Material；
(7) again slurry is made powder by sponging granulator.
As preferably, in WC powder and Co powder, Co accounts for 5 10%.
As preferably, during hot pressed sintering, first sinter 20 30s with the temperature of 280 320 DEG C, then with 500 600 DEG C
Temperature sinters 40 60s, then sinters 20 30s with 650 700 DEG C of temperature.
As preferably, heat treatment uses solid solution, cold pressing deformation and Ageing Treatment successively.
As preferably, the temperature of solution treatment is 650 700 DEG C, and the time is 10 12min.
As preferably, the deflection of colding pressing of deformation process of colding pressing is 30 35%.
As preferably, the temperature of Ageing Treatment is 300 350 DEG C, and the time is 2 3h.
As preferably, extruded carrying out in protective atmosphere, pressure is 1000 1200MPa.
As preferably, described liquid uses distilled water or deionized water, and the mass ratio of hard alloy and liquid is
(2.5 3): 1；Described organic bond uses metal granulating agent, and its addition is the 2 4% of hard alloy quality.
As preferably, described sponging granulator uses centrifugal spraying granulator, and the rotating speed of centrifugal spraying granulator is
5000 8000 revs/min；The inlet temperature of described sponging granulator dry air is 250 350 DEG C, outlet temperature is 100
150℃；The flow of dry air is 100 200 Nm3 /h；Charging rate is 10 20 kg/h.
As can be known from the above technical solutions, the present invention can remove the impurity of metal powder surface by cleaning, after raising
The alloy purity of continuous preparation, then can improve the mechanical activation of powder by the way of batch mixing and grinding, for the tight knot of alloy
Close and preferably basis is provided；Again WC-Co alloyed powder is carried out hot pressed sintering and heat treatment, higher hardness and intensity can be obtained
Hardmetal materials.
Detailed description of the invention
The present invention is described more detail below, and illustrative examples and explanation in this present invention are used for explaining the present invention,
But it is not as a limitation of the invention.
A kind of processing technique of Hardmetal materials, it comprises the following steps:
With WC, Co grain as raw material, and it is 5 10wt% dispensings by the content of Co；Then WC grain and Co grain are carried out respectively,
Remove surface impurity；WC grain and Co after cleaning are respectively crushed into powder；Again by above-mentioned powder mix homogeneously in batch mixer
After be ground, obtain alloyed powder.Above-mentioned alloyed powder is placed in extrusion die, more extruded by extruder, obtain hard
Matter alloy material；In extrusion process, the metal powder end in mould is in addition to the normal pressure being squeezed machine drift, also by mould
The lateral pressure of tool wall and the effect of frictional force；Along with the movement of drift, the powder in mould is progressively compacted, thus passes through mould
Extrusion.In order to prevent burning, extruded carrying out under protective atmosphere, pressure uses 1000 1200MPa, so can obtain
Consistency higher material, and performance profile is uniform, and productivity ratio is high；Then the hard alloy to above-mentioned extruded acquisition
Material is sintered, and sintering is carried out in three stages, first sinters 20 30s with the temperature of 280 320 DEG C, then with 500 600
DEG C temperature sinters 40 60s, then sinters 20 30s with 650 700 DEG C of temperature；First stage belongs to the sintering preparatory stage, for entering
One step ground sintering environment purification；Second stage, along with the rising of temperature, initially forms sintering neck, and phase between alloying substance granule
Combining mutually, particle surface oxide generation reduction reaction, thus continue to participate in sintering, intergranular combination encloses each other
Space；The sintering temperature of three phases is higher, and intergranular sintering neck is grown up further, and more granule is merged,
Sintered body is shunk further, nodularization, thus intensity and the hardness of material is prepared in raising.
Above-mentioned powdered metallurgical material is carried out heat treatment；Heat treatment uses solid solution, cold pressing deformation and Ageing Treatment successively；Gu
The temperature of molten process is 650 700 DEG C, and the time is 10 12min, so can control nickel, the aluminum solid solubility in Copper substrate and
Grain size；Solid solubility temperature is too high, can cause coarse grains, reduces alloy strength；Solid solubility temperature is too low, though crystal grain is less, but
Follow-up Ageing Treatment can be caused to be difficult to play the effect of reinforced alloys.The deflection of colding pressing of deformation process of colding pressing is 30 35%；Time
Effect carries out cold deformation to alloy before processing, and alloy can be made to present the double effects of working hardening and ageing strengthening；At timeliness
The temperature of reason is 300 350 DEG C, and the time is 2 3h；Ageing Treatment can separate out the second phase, produces dispersion-strengtherning.After heat treatment
Hard alloy and liquid mixing, and add metal granulating agent and stir, it is configured to metal powder slurry；Again by slurry by centrifugal
Sponging granulator prepares metal dust.
Embodiment 1
95wt %WC grain and 5wt %Co grain are carried out respectively, remove surface impurity；WC grain after cleaning and Co powder respectively
It is broken into powder；Again above-mentioned powder is ground after mix homogeneously in batch mixer, obtains alloyed powder；Alloyed powder is placed in extruding
In mould, then the pressure extrusion molding by extruder employing 1000MPa, obtain Hardmetal materials, then with the temperature of 280 DEG C
Degree sintering 30s, then with 500 DEG C of temperature sintering 60s, then with 650 DEG C of temperature sintering 30s；Subsequently with 650 DEG C of solution treatment
12min；Then colding pressing deformation process, deflection of colding pressing is 30%；Last with 300 DEG C of Ageing Treatment 3h, obtain WC-Co hard and close
Gold copper-base alloy；Then hard alloy is mixed with distilled water, and the mass ratio of hard alloy and distilled water is 2.5:1, and add hard
2% metal granulating agent of matter alloy mass stirs, and is configured to metal powder slurry；Again slurry is passed through centrifugal spraying granulator
Carry out pelletize, wherein the inlet temperature of sponging granulator dry air be 250 DEG C, outlet temperature be 100 DEG C, the stream of dry air
Amount is 100 Nm3 / h, charging rate are 10kg/h, and the rotating speed of centrifugal spraying granulator is 5000 revs/min, thus obtains metal
Powder.The hardness recording this material is 57.6HRC, and shear strength is 623.2MPa.
Embodiment 2
92wt %WC grain and 8wt %Co grain are carried out respectively, remove surface impurity；WC grain after cleaning and Co powder respectively
It is broken into powder；Again above-mentioned powder is ground after mix homogeneously in batch mixer, obtains alloyed powder；Alloyed powder is placed in extruding
In mould, then the pressure extrusion molding by extruder employing 1100MPa, obtain Hardmetal materials, then with the temperature of 300 DEG C
Degree sintering 25s, then with 560 DEG C of temperature sintering 50s, then with 680 DEG C of temperature sintering 25s；Subsequently with 680 DEG C of solution treatment
11min；Then colding pressing deformation process, deflection of colding pressing is 32%；Last with 330 DEG C of Ageing Treatment 2.5h, obtain WC-Co hard
Alloy material；Then hard alloy is mixed with deionized water, and the mass ratio of hard alloy and deionized water is 2.8:1, and
The 3% metal granulating agent adding hard alloy quality stirs, and is configured to metal powder slurry；Again slurry is passed through centrifugal spray
Comminutor carries out pelletize, and wherein the rotating speed of centrifugal spraying granulator is 6000 revs/min, the import temperature of sponging granulator dry air
Degree is 300 DEG C, outlet temperature is 130 DEG C, the flow of dry air is 150 Nm3 / h, charging rate are 15 kg/h, thus obtain
Obtain metal dust.The hardness recording this material is 68.4HRC, and shear strength is 676.1MPa.
Embodiment 3
90wt %WC grain and 10wt %Co grain are carried out respectively, remove surface impurity；WC grain after cleaning and Co difference
It is ground into powder；Again above-mentioned powder is ground after mix homogeneously in batch mixer, obtains alloyed powder；Alloyed powder is placed in crowded
In compression mould, then the pressure extrusion molding by extruder employing 1200MPa, obtain Hardmetal materials, then with 320 DEG C
Temperature sintering 20s, then with 600 DEG C of temperature sintering 40s, then with 700 DEG C of temperature sintering 20s；Subsequently with 700 DEG C of solution treatment
10min；Then colding pressing deformation process, deflection of colding pressing is 35%；Last with 350 DEG C of Ageing Treatment 2h, obtain WC-Co hard and close
Gold copper-base alloy；Then hard alloy is mixed with deionized water, and the mass ratio of hard alloy and deionized water is 3:1, and add
4% metal granulating agent of hard alloy quality stirs, and is configured to metal powder slurry；Again slurry is passed through centrifugal spray granulation
Machine carries out pelletize, and wherein the rotating speed of centrifugal spraying granulator is 8000 revs/min, and the inlet temperature of sponging granulator dry air is
350 DEG C, outlet temperature be 150 DEG C, the flow of dry air be 200 Nm3 / h, charging rate are 20 kg/h；Record this material
Hardness be 64.8HRC, shear strength is 617.3MPa.
The technical scheme provided the embodiment of the present invention above is described in detail, specific case used herein
Principle and embodiment to the embodiment of the present invention are set forth, and the explanation of above example is only applicable to help to understand this
The principle of inventive embodiments；Simultaneously for one of ordinary skill in the art, according to the embodiment of the present invention, in specific embodiment party
All will change in formula and range of application, in sum, this specification content should not be construed as limitation of the present invention.
Claims (10)
1. a processing technique for Hardmetal materials, it comprises the following steps:
(1) WC grain and Co grain are carried out respectively, remove surface impurity；
(2) WC grain and Co after cleaning are respectively crushed into powder；
(3) more above-mentioned powder is ground after mix homogeneously in batch mixer, obtains alloyed powder；
(4) above-mentioned alloyed powder is placed in extrusion die, more extruded by extruder, obtain Hardmetal materials；
(5) more above-mentioned Hardmetal materials is sintered and heat treatment；
(6) by the hard alloy after heat treatment and liquid mixing, and add organic bond and stir, be configured to metal powder pulp
Material；
(7) again slurry is made powder by sponging granulator.
The processing technique of Hardmetal materials the most according to claim 1, it is characterised in that: in WC grain and Co grain, Co accounts for
5—10%。
3. the processing technique of Hardmetal materials as claimed in claim 1, it is characterised in that: during hot pressed sintering, first with 280
The temperature of 320 DEG C sinters 20 30s, then sinters 40 60s with 500 600 DEG C of temperature, then with 650 700 DEG C of temperature sintering
20—30s。
4. the processing technique of as claimed in claim 1 Hardmetal materials, it is characterised in that: heat treatment uses solid solution, cold successively
Compressive strain and Ageing Treatment.
5. the processing technique of Hardmetal materials as claimed in claim 4, it is characterised in that: the temperature of solution treatment is 650
700 DEG C, the time is 10 12min.
6. the processing technique of Hardmetal materials as claimed in claim 4, it is characterised in that: the deformation of colding pressing of deformation process of colding pressing
Amount is 30 35%.
7. the processing technique of Hardmetal materials as claimed in claim 4, it is characterised in that: the temperature of Ageing Treatment is 300
350 DEG C, the time is 2 3h.
8. the processing technique of as claimed in claim 1 Hardmetal materials, it is characterised in that: extruded enter in protective atmosphere
OK, pressure is 1000 1200MPa.
9. the processing technique of Hardmetal materials as claimed in claim 1, it is characterised in that: described liquid uses distilled water or goes
Ionized water, and the mass ratio of hard alloy and liquid is (2.5 3): 1；Described organic bond uses metal granulating agent, and it adds
Enter that amount is hard alloy quality 2 4%.
10. the processing technique of as claimed in claim 1 Hardmetal materials, it is characterised in that: described sponging granulator use from
Heart sponging granulator, the rotating speed of centrifugal spraying granulator is 5,000 8000 revs/min；Entering of described sponging granulator dry air
Mouthful temperature is 250 350 DEG C, outlet temperature is 100 150 DEG C；The flow of dry air is 100 200 Nm3 /h；Charging
Speed is 10 20 kg/h.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610867407.3A CN106191611A (en) | 2016-09-30 | 2016-09-30 | A kind of processing technique of Hardmetal materials |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610867407.3A CN106191611A (en) | 2016-09-30 | 2016-09-30 | A kind of processing technique of Hardmetal materials |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557983A (en) * | 2004-02-09 | 2004-12-29 | 自贡硬质合金有限责任公司 | Production method for hard carbide with graded distributed cobalt content |
| CN102220534A (en) * | 2011-07-20 | 2011-10-19 | 中南大学 | Method for reinforcing binder phase of hard alloy |
| CN102534344A (en) * | 2012-03-14 | 2012-07-04 | 中南大学 | Extra coarse grain WC-Co hard alloy and preparation process thereof |
-
2016
- 2016-09-30 CN CN201610867407.3A patent/CN106191611A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557983A (en) * | 2004-02-09 | 2004-12-29 | 自贡硬质合金有限责任公司 | Production method for hard carbide with graded distributed cobalt content |
| CN102220534A (en) * | 2011-07-20 | 2011-10-19 | 中南大学 | Method for reinforcing binder phase of hard alloy |
| CN102534344A (en) * | 2012-03-14 | 2012-07-04 | 中南大学 | Extra coarse grain WC-Co hard alloy and preparation process thereof |
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Application publication date: 20161207 |