CN104928512A - Method for preparing ultra-coarse-grain tungsten-cobalt hard alloy - Google Patents
Method for preparing ultra-coarse-grain tungsten-cobalt hard alloy Download PDFInfo
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Abstract
Disclosed is a method for preparing ultra-coarse-grain tungsten-cobalt hard alloy. The method comprises the following technological steps of batching, wet grinding, drying, pre-burning treatment, wet mixing, drying, formagen mixing, palletizing, compression moulding and vacuum low-temperature integrated sintering. In the batching process, cobalt powder and tungsten carbide powder are selected for mixing and batching, and the mass ratio of the cobalt powder to the tungsten carbide powder is 2.4-2.6:97.4-97.6. Metal cobalt powder and Co<2>W<4>C nano-particles are added to mixtures obtained after pre-burning treatment, the mass ratio of cobalt to tungsten carbide in the mixtures is 8-13:87-92, and the addition of the Co<2>W<4>C nano-particles needs to enable the mass ratio of the cobalt to the Co<2>W<4>C nano-particles in the mixtures to be 1:0.045-0.055. According to the technical scheme, compared with the prior art, the WC mean grain size of the prepared hard alloy is 4.0 microns to 5.2 microns, the bending strength is 3,000 MPa-3,400 MPa, and hardness HRA is 88.0-90.8.
Description
Technical field
The present invention relates to a kind of preparation method of Wimet, particularly a kind of preparation method of super coarse-grain tungsten-cobalt hard alloy.
Background technology
Along with the development of hard carbide industry, more and more higher to the requirement of its raw material WC powder (i.e. tungsten carbide powder).Particularly the preparation of super thick type Wimet, has strict requirement to the granularity of WC powder, and at present, the aggregation extent of WC powder is higher, and powder size is thick not, and coarsness WC powder all exists WC particle aggregate.Due to the existence of aggregate, easily cause Fei Shi mean particle size large, and the illusion that actual particle size is partially thin.In addition the differing in conjunction with tightness of aggregate, thus increases the manufacture difficulty of high-quality Wimet, makes hard metal article difficult unification accomplishing height in wear resistance and toughness.And the large height of WC powder cost of import, be unfavorable for domestic large-scale production.The crystal grain of the coarse-grain tungsten-cobalt hard alloy through operation productions such as wet-milling, drying, compression moulding, vacuum sinterings generally adopted so current is maximum is also between 3.2 ~ 4.0 μm.Bending strength 2600 ~ 3000MPa, hardness Hv
301150 ~ 1320, intensity and microhardness are mated poor, and over-all properties is lower, especially the hot hardness of alloy and hot strength not high, shock resistance and heat resistanceheat resistant flow ability poor, difficult being applicable to, works in high temperature environments, greatly constrains the range of application of Wimet.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art and a kind of preparation method of super coarse-grain tungsten-cobalt hard alloy is provided, the WC mean grain size of the Wimet prepared by it reaches 4.0 ~ 5.2 μm, bending strength reaches 3000 ~ 3400MPa, hardness HRA88.0 ~ 90.8, the matched well of alloy strength and microhardness can be realized, make hard metal article in wear resistance and toughness, reach the unification of height, improve the comprehensive use properties of alloy.
Technical scheme of the present invention is: a kind of preparation method of super coarse-grain tungsten-cobalt hard alloy, and it comprises following processing step: batching, wet-milling, drying, preheating, wet mixing, drying, mix binder, granulation, compression moulding and vacuum low-pressure integral sintering; Cobalt powder and tungsten carbide powder is selected to carry out mix during batching, the mass ratio of cobalt powder and tungsten carbide powder is 2.4 ~ 2.6: 97.4 ~ 97.6, tungsten carbide powder selects Fsss granularity to be the Coarse Grain Tungsten Carbide of 13.0 ~ 18.5 μm, and the granularity of cobalt powder is 1.4 ~ 2.0 μm; Wet-milling is ball milling; Carry out drying after wet-milling, the compound obtained after drying carries out preheating; Compound after preheating is added metal cobalt powder and Co again
2w
4c nano particle, the add-on of cobalt powder will reach and make the mass ratio of the cobalt in compound and wolfram varbide be 8 ~ 13: 87 ~ 92, Co
2w
4the add-on of C nano particle will reach and make cobalt in compound and Co
2w
4the mass ratio of C nano particle is 1: 0.045 ~ 0.055.
The preferred technical solution of the present invention is: ball-milling medium during described wet-milling is acetone, and the ratio of ball material is 3: 1, and the ratio of solid-liquid is 5: 1, and the wet-milling time is 7 ~ 12 hours.
The further optimal technical scheme of the present invention is: described preheating reaches 700 ~ 850 DEG C for heating up through 3 ~ 4 hours, then is incubated 55 ~ 65 minutes.
The present invention further optimal technical scheme is: add metal cobalt powder and Co again in the compound after preheating
2w
458 ~ 62 DEG C to be heated to after C nano particle and carry out wet mixing 3.5 ~ 4.5 hours.
The present invention also further optimal technical scheme is: the top temperature of described vacuum low-pressure integral sintering is 1440 ~ 1460 DEG C.
The present invention also further optimal technical scheme is: select the mass ratio of cobalt powder and tungsten carbide powder to be 2.5: 97.5 during batching; Tungsten carbide powder selects Fsss granularity to be the Coarse Grain Tungsten Carbide of 13.5 ~ 15.5 μm; Compound after preheating is added metal cobalt powder and Co again
2w
4c nano particle, the add-on of cobalt powder will reach and make the mass ratio of the cobalt in compound and wolfram varbide be 9 ~ 11.5: 88.5 ~ 91, Co
2w
4the add-on of C nano particle will reach and make cobalt in compound and Co
2w
4the mass ratio of C nano particle is 1: 0.048 ~ 0.052.
The explanation of the primary symbols that the present invention uses or title:
WC: wolfram varbide;
Fsss granularity: Fsss Full Name in English is Fisher Sub-sieve Sizer, i.e. " Fei Shi sieve " granularity of measuring;
Co: cobalt;
WC powder: tungsten carbide powder.
The present invention compared with prior art has following features:
The present invention adopts Fsss granularity to be granularity 1.4 ~ 2.0 μm of metal Co powder of 13.0 ~ 18.5 μm of common coarse-grained WC powder close to monocrystalline and mass percent 2.5%; The preheating operation simultaneously increased improves WC particle by the parcel degree of cobalt, slow down the irregular of WC grain in sintering process and grows up, and makes the pattern before WC maintenance sintering; Be aided with wet mixing operation to be deployed in target cobalt amount and cobalt and to mix Co
2w
4c nano particle can strengthen Binder Phase, alleviate alloy crack propagation in use, the mean particle size of WC in the extra-coarse grained carbide alloy finally obtained is made to reach 4.0 ~ 5.2 μm, toughness is high, and perfect crystalline, defect is few, microstrain is little, subgrain is thick evenly, microhardness is high, its wear resistance and toughness are greatly improved, bending strength reaches 3000 ~ 3400MPa, hardness reaches HRA88.0 ~ 90.8, achieve the matched well of intensity and microhardness, thus alloy over-all properties is improved widely; Because high tenacity of the present invention surpasses coarse-grain Wimet by controlling cobalt and Co
2w
4the mixed ratio of C nano particle, both enhanced the intensity of Binder Phase and improved intergranular microtexture, put forward heavy alloyed toughness and wear resistance, more significantly improve the thermal shock resistance of alloy, make the steady quality such as mine, digging tool shield structure cutter, pick being surpassed the manufacture of coarse-grain Wimet by high tenacity of the present invention, its work-ing life extends more than 30%, greatly expands the use range of Wimet.
In order to be illustrated more clearly in the present invention, enumerate following examples, but it is without any restrictions to scope of invention.
Embodiment
Embodiment 1:
A preparation method for super coarse-grain tungsten-cobalt hard alloy, it comprises following processing step: batching, wet-milling, drying, preheating, wet mixing, drying, mix binder, granulation, compression moulding and vacuum low-pressure integral sintering; Select cobalt powder and tungsten carbide powder (WC powder) during batching, the mass ratio of cobalt powder and tungsten carbide powder is 2.5: 97.5, and tungsten carbide powder selects Fsss granularity to be the Coarse Grain Tungsten Carbide of 13.0 ~ 13.5 μm, and the granularity of cobalt powder is 1.4 ~ 2.0 μm; Wet-milling is ball milling, and ball-milling medium is acetone, and the ratio of ball material is 3: 1, and the ratio of solid-liquid is 5: 1, and the wet-milling time is 7 hours; Carry out drying after wet-milling, the compound obtained after drying carries out preheating, and preheating heated up through 4 hours and reaches 700 ~ 850 DEG C, then was incubated 60 minutes; Compound after preheating is added metal cobalt powder and Co again
2w
4c nano particle, the add-on of cobalt powder will reach makes the mass ratio of the cobalt in compound and wolfram varbide be 8: 92 (namely will comprise the cobalt powder that the ratio being first 2.5: 97.5 with the mass ratio of cobalt powder and tungsten carbide powder has added, that is the mass ratio that the cobalt powder added specifically will meet cobalt powder sum and the wolfram varbide added for twice is 8: 92, following examples are synonym therewith), Co
2w
4the add-on of C nano particle will reach and make cobalt in compound and Co
2w
4the mass ratio of C nano particle is 1: 0.045, and is heated to 60 DEG C of wet mixings 4 hours; Again drying, mix binder, granulation, compression moulding, vacuum low-pressure integral sintering, the top temperature of vacuum low-pressure integral sintering is 1460 DEG C.
The high tenacity obtained by the present embodiment is surpassed coarse-grain tungsten-cobalt hard alloy (compact dimensions is the standard prod of 6.5*5.25*20 μm) 100, sample to detect, obtain that WC mean grain size is 4.0 μm, average bending strength is 3000MPa, average hardness is HRA90.8.
Embodiment 2:
A preparation method for super coarse-grain tungsten-cobalt hard alloy, it comprises following processing step: batching, wet-milling, drying, preheating, wet mixing, drying, mix binder, granulation, compression moulding and vacuum low-pressure integral sintering; Select cobalt powder and tungsten carbide powder (WC powder) during batching, the mass ratio of cobalt powder and tungsten carbide powder is 2.4: 97.6, and tungsten carbide powder selects Fsss granularity to be the Coarse Grain Tungsten Carbide of 13.5 ~ 15.5 μm, and the granularity of cobalt powder is 1.4 ~ 2.0 μm; Wet-milling is ball milling, and ball-milling medium is acetone, and the ratio of ball material is 3: 1, and the ratio of solid-liquid is 5: 1, and the wet-milling time is 8 hours; Carry out drying after wet-milling, the compound obtained after drying carries out preheating, and preheating heated up through 4 hours and reaches 800 DEG C, then was incubated 60 minutes; Compound after preheating is added metal cobalt powder and Co again
2w
4c nano particle, the add-on of cobalt powder will reach and make the mass ratio of the cobalt in compound and wolfram varbide be 9: 91, Co
2w
4the add-on of C nano particle will reach and make cobalt in compound and Co
2w
4the mass ratio of C nano particle is 1: 0.048, and is heated to 60 DEG C of wet mixings 4 hours; Again drying, mix binder, granulation, compression moulding, vacuum low-pressure integral sintering, the top temperature of vacuum low-pressure integral sintering is 1450 DEG C.
The high tenacity obtained by the present embodiment is surpassed coarse-grain tungsten-cobalt hard alloy (compact dimensions is the standard prod of 6.5*5.25*20 μm) 100, sample to detect, obtain that WC mean grain size is 4.5 μm, average bending strength is 3200MPa, average hardness is HRA89.5.
Embodiment 3:
A preparation method for super coarse-grain tungsten-cobalt hard alloy, it comprises following processing step: batching, wet-milling, drying, preheating, wet mixing, drying, mix binder, granulation, compression moulding and vacuum low-pressure integral sintering; Select cobalt powder and tungsten carbide powder (WC powder) during batching, the mass ratio of cobalt powder and tungsten carbide powder is 2.6: 97.4, and tungsten carbide powder selects Fsss granularity to be the Coarse Grain Tungsten Carbide of 15.5 ~ 17.2 μm, and the granularity of cobalt powder is 1.4 ~ 2.0 μm; Wet-milling is ball milling, and ball-milling medium is acetone, and the ratio of ball material is 3: 1, and the ratio of solid-liquid is 5: 1, and the wet-milling time is 9 hours; Carry out drying after wet-milling, the compound obtained after drying carries out preheating, and preheating heated up through 4 hours and reaches 750 DEG C, then was incubated 60 minutes; Compound after preheating is added metal cobalt powder and Co again
2w
4c nano particle, the add-on of cobalt powder will reach and make the mass ratio of the cobalt in compound and wolfram varbide be 9.5: 90.5, Co
2w
4the add-on of C nano particle will reach and make cobalt in compound and Co
2w
4the mass ratio of C nano particle is 1: 0.050, and is heated to 58 ~ 62 DEG C of wet mixings 4 hours; Again drying, mix binder, granulation, compression moulding, vacuum low-pressure integral sintering, the top temperature of vacuum low-pressure integral sintering is 1450 DEG C.
The high tenacity obtained by the present embodiment is surpassed coarse-grain tungsten-cobalt hard alloy (compact dimensions is the standard prod of 6.5*5.25*20 μm) 100, sample to detect, obtain that WC mean grain size is 4.8 μm, average bending strength is 3200MPa, average hardness is HRA89.0.
Embodiment 4:
A preparation method for super coarse-grain tungsten-cobalt hard alloy, it comprises following processing step: batching, wet-milling, drying, preheating, wet mixing, drying, mix binder, granulation, compression moulding and vacuum low-pressure integral sintering; Select cobalt powder and tungsten carbide powder (WC powder) during batching, the mass ratio of cobalt powder and tungsten carbide powder is 2.5: 97.5, and tungsten carbide powder selects Fsss granularity to be the Coarse Grain Tungsten Carbide of 17.2 ~ 18.0 μm, and the granularity of cobalt powder is 1.4 ~ 2.0 μm; Wet-milling is ball milling, and ball-milling medium is acetone, and the ratio of ball material is 3: 1, and the ratio of solid-liquid is 5: 1, and the wet-milling time is 10 hours; Carry out drying after wet-milling, the compound obtained after drying carries out preheating, and preheating heated up through 3 hours and reaches 700 DEG C, then was incubated 55 ~ 65 minutes;
Compound after preheating is added metal cobalt powder and Co again
2w
4c nano particle, the add-on of cobalt powder will reach and make the mass ratio of the cobalt in compound and wolfram varbide be 11.5: 88.5, Co
2w
4the add-on of C nano particle will reach and make cobalt in compound and Co
2w
4the mass ratio of C nano particle is 1: 0.052, and is heated to 58 ~ 62 DEG C of wet mixings 4 hours; Again drying, mix binder, granulation, compression moulding, vacuum low-pressure integral sintering, the top temperature of vacuum low-pressure integral sintering is 1450 DEG C.
The high tenacity obtained by the present embodiment is surpassed coarse-grain tungsten-cobalt hard alloy (compact dimensions is the standard prod of 6.5*5.25*20 μm) 100, sample to detect, obtain that WC mean grain size is 5.2 μm, average bending strength is 3400MPa, average hardness is HRA88.5.
Embodiment 5:
A preparation method for super coarse-grain tungsten-cobalt hard alloy, it comprises following processing step: batching, wet-milling, drying, preheating, wet mixing, drying, mix binder, granulation, compression moulding and vacuum low-pressure integral sintering; Select cobalt powder and tungsten carbide powder (WC powder) during batching, the mass ratio of cobalt powder and tungsten carbide powder is 2.5: 97.5, and tungsten carbide powder selects Fsss granularity to be the Coarse Grain Tungsten Carbide of 18.0 ~ 18.5 μm, and the granularity of cobalt powder is 1.4 ~ 2.0 μm; Wet-milling is ball milling, and ball-milling medium is acetone, and the ratio of ball material is 3: 1, and the ratio of solid-liquid is 5: 1, and the wet-milling time is 12 hours; Carry out drying after wet-milling, the compound obtained after drying carries out preheating, and preheating heated up through 3 hours and reaches 700 DEG C, then was incubated 60 minutes; Compound after preheating is added metal cobalt powder and Co again
2w
4c nano particle, the add-on of cobalt powder will reach and make the mass ratio of the cobalt in compound and wolfram varbide be 13: 87, Co
2w
4the add-on of C nano particle will reach and make cobalt in compound and Co
2w
4the mass ratio of C nano particle is 1: 0.055, and is heated to 60 DEG C of wet mixings 3.5 ~ 4.5 hours; Again drying, mix binder, granulation, compression moulding, vacuum low-pressure integral sintering, the top temperature of vacuum low-pressure integral sintering is 1440 DEG C.
The high tenacity obtained by the present embodiment is surpassed coarse-grain tungsten-cobalt hard alloy (compact dimensions is the standard prod of 6.5*5.25*20 μm) 100, sample to detect, obtain that WC mean grain size is 5.0 μm, average bending strength is 3300MPa, average hardness is HRA88.0.
Claims (3)
1. a preparation method for super coarse-grain tungsten-cobalt hard alloy, is characterized in that: it comprises following processing step: batching, wet-milling, drying, preheating, wet mixing, drying, mix binder, granulation, compression moulding and vacuum low-pressure integral sintering; Cobalt powder and tungsten carbide powder is selected to carry out mix during batching, the mass ratio of cobalt powder and tungsten carbide powder is 2.4 ~ 2.6: 97.4 ~ 97.6, tungsten carbide powder selects Fsss granularity to be the Coarse Grain Tungsten Carbide of 13.0 ~ 18.5 μm, and the granularity of cobalt powder is 1.4 ~ 2.0 μm; Wet-milling is ball milling; Carry out drying after wet-milling, the compound obtained after drying carries out preheating; Compound after preheating is added metal cobalt powder and Co again
2w
4c nano particle, the add-on of cobalt powder will reach and make the mass ratio of the cobalt in compound and wolfram varbide be 8 ~ 13: 87 ~ 92, Co
2w
4the add-on of C nano particle will reach and make cobalt in compound and Co
2w
4the mass ratio of C nano particle is 1: 0.045 ~ 0.055; Metal cobalt powder and Co is added again in compound after preheating
2w
458 ~ 62 DEG C to be heated to after C nano particle and carry out wet mixing 3.5 ~ 4.5 hours.
2. the preparation method of super coarse-grain tungsten-cobalt hard alloy according to claim 1, is characterized in that: the top temperature of described vacuum low-pressure integral sintering is 1440 ~ 1460 DEG C.
3. the preparation method of super coarse-grain tungsten-cobalt hard alloy according to claim 1 and 2, is characterized in that: select the mass ratio of cobalt powder and tungsten carbide powder to be 2.5: 97.5 during batching; Tungsten carbide powder selects Fsss granularity to be the Coarse Grain Tungsten Carbide of 13.5 ~ 15.5 μm; Compound after preheating is added metal cobalt powder and Co again
2w
4c nano particle, the add-on of cobalt powder will reach and make the mass ratio of the cobalt in compound and wolfram varbide be 9 ~ 11.5: 88.5 ~ 91, Co
2w
4the add-on of C nano particle will reach and make cobalt in compound and Co
2w
4the mass ratio of C nano particle is 1: 0.048 ~ 0.052.
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| CN201010553047.2A CN101985717B (en) | 2010-11-13 | 2010-11-13 | Method for preparing high-tenacity super-coarse-grained tungsten and cobalt hard alloy |
| CN201510386912.1A CN104928512B (en) | 2010-11-13 | 2010-11-13 | The preparation method of super coarse-grain tungsten-cobalt hard alloy |
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| CN201510386912.1A Expired - Fee Related CN104928512B (en) | 2010-11-13 | 2010-11-13 | The preparation method of super coarse-grain tungsten-cobalt hard alloy |
| CN201010553047.2A Expired - Fee Related CN101985717B (en) | 2010-11-13 | 2010-11-13 | Method for preparing high-tenacity super-coarse-grained tungsten and cobalt hard alloy |
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| CN106583707A (en) * | 2016-12-23 | 2017-04-26 | 南昌硬质合金有限责任公司 | Preparation method of high-liquidity oversized tungsten carbide-cobalt composite powder |
| CN108274005A (en) * | 2018-02-08 | 2018-07-13 | 合肥工业大学 | A method of low cobalt, ultra-fine cemented carbide bar are prepared with nanometer WC-Co composite powder |
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| CN110385430A (en) * | 2019-08-21 | 2019-10-29 | 西迪技术股份有限公司 | A kind of powder body material of 3D printing |
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| CN105779844B (en) * | 2016-03-11 | 2019-01-22 | 中国神华能源股份有限公司 | A kind of nano hard alloy and preparation method thereof |
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| CN106583707B (en) * | 2016-12-23 | 2019-01-01 | 南昌硬质合金有限责任公司 | A kind of preparation method of the super thick WC-Co composite powder of high fluidity |
| CN108274005A (en) * | 2018-02-08 | 2018-07-13 | 合肥工业大学 | A method of low cobalt, ultra-fine cemented carbide bar are prepared with nanometer WC-Co composite powder |
| CN108274005B (en) * | 2018-02-08 | 2019-09-13 | 合肥工业大学 | A method of low cobalt, ultra-fine cemented carbide bar are prepared with nanometer WC-Co composite powder |
| CN109468517A (en) * | 2018-12-29 | 2019-03-15 | 株洲硬质合金集团有限公司 | A kind of preparation method and application of pile foundation engineering hard alloy |
| CN110385430A (en) * | 2019-08-21 | 2019-10-29 | 西迪技术股份有限公司 | A kind of powder body material of 3D printing |
| CN110385430B (en) * | 2019-08-21 | 2022-02-08 | 西迪技术股份有限公司 | 3D printed powder material |
| RU2808850C1 (en) * | 2023-04-28 | 2023-12-05 | Общество с ограниченной ответственностью "Сборные конструкции инструмента, фрезы Москвитина" | Method for producing sintered carbide inserts for cutting tools based on tungsten carbide |
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| Publication number | Publication date |
|---|---|
| CN101985717B (en) | 2015-07-01 |
| CN104962770A (en) | 2015-10-07 |
| CN104928512B (en) | 2019-06-04 |
| CN101985717A (en) | 2011-03-16 |
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