CN107312960A - Hard alloy and preparation method thereof - Google Patents

Hard alloy and preparation method thereof Download PDF

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Publication number
CN107312960A
CN107312960A CN201710384565.8A CN201710384565A CN107312960A CN 107312960 A CN107312960 A CN 107312960A CN 201710384565 A CN201710384565 A CN 201710384565A CN 107312960 A CN107312960 A CN 107312960A
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CN
China
Prior art keywords
powder
hard alloy
tungsten carbide
alloy
ball
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CN201710384565.8A
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Chinese (zh)
Inventor
周悫昱
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株洲夏普高新材料有限公司
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Priority to CN201710384565.8A priority Critical patent/CN107312960A/en
Publication of CN107312960A publication Critical patent/CN107312960A/en

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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/04Making alloys by powder metallurgy
    • C22C1/05Mixtures of metal powder with non-metallic powder
    • C22C1/051Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C29/00Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06Alloys 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
    • C22C29/08Alloys 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

Abstract

The invention discloses a kind of hard alloy and preparation method thereof, hard alloy is formed by following components sintering, and component and each component mass percent are as follows:Cobalt powder:8.0%~11.5%;Be carbonized tantalum powder:0.4%~0.6%;Remaining is tungsten carbide powder, amounts to 100%;Wherein, the Fisher particle size of the tungsten carbide powder is 11.0~15.0 μm, and the scope of the Hcp values of the tungsten carbide powder is (4.50~5.10) KA/m.The present invention can realize the matched well of alloy strength and microhardness, improve the combination property and heat shock resistance of hard alloy and the ability of heat resistanceheat resistant flow.

Description

Hard alloy and preparation method thereof
Technical field
The present invention relates to a kind of hard alloy and preparation method thereof.
Background technology
At present, hard alloy has extensive purposes with its high rigidity and high intensity, domestic in the past in manufacture mine drilling When instrument and sand making machine alloy sheet commonly use material be usually Fisher particle size be 16.0~25.0 μm common coarse-grained WC powder and Co powder, is made through processes such as wet-milling, drying, compressing and vacuum-sinterings;With coarse grain hard alloy made from this method Intensity and microhardness matching are poor, and combination property is relatively low, and the elevated temperature strength of especially alloy is not high, heat shock resistance and heat resistanceheat resistant modeling Change ability is not high, is not suitable for working in high temperature environments, greatly limit the application of alloy.
The content of the invention
The technical problems to be solved by the invention be the defect for overcoming prior art there is provided a kind of hard alloy, it can The matched well of alloy strength and microhardness is realized, combination property and heat shock resistance and the heat resistanceheat resistant modeling of hard alloy is improved The ability of change.
In order to solve the above technical problems, the technical scheme is that:A kind of hard alloy, it is sintered by following components Form, component and each component mass percent are as follows:
Cobalt powder:8.0%~11.5%;
Be carbonized tantalum powder:0.4%~0.6%;
Remaining is tungsten carbide powder, amounts to 100%;Wherein, the Fisher particle size of the tungsten carbide powder is 11.0~15.0 μm, institute The scope for stating the Hcp values of tungsten carbide powder is (4.50~5.10) KA/m.
Further, the tungsten carbide powder using reduction and carbonization method prepare, and use content for more than 99.99% tungsten Powder, in preparation process, reduction temperature is 950 DEG C~1050 DEG C, and carburizing temperature is 1980 DEG C~2200 DEG C.
Further for being both beneficial to improve Binder Phase composition and intergranular microstructure, the intensity of alloy is improved and wear-resisting Property, the ability of alloy heat shock resistance and heat resistanceheat resistant flow is more significantly improved, competent bed drilling tool is more beneficial for and sand making machine is closed The proportion scale of the use of gold plaque, carbonization tantalum powder and cobalt powder is 0.04~0.06:1.
Present invention also offers a kind of preparation method of hard alloy, the step of method in contain:
(a) according to each component and each component mass percent dispensing;
(b) wet-milling;
(c) dry;
(d) it is compressing;
(e) sinter, obtain finished product.
Further, in described step (b), using alcohol as ball-milling medium, the ball material mass ratio of wet-milling for 2.5~ 3.5:1, liquid-solid ratio is 200~210ml/Kg, and Ball-milling Time is 13~26h.
Further for its alloy grain is preferably improved, the porosity defects of alloy are reduced, intensity are lifted, in described step Suddenly in (e), the temperature of sintering is 1440 DEG C~1520 DEG C.
Employ after above-mentioned technical proposal, due to having selected Fisher particle size to be 11.0~15.0 μm, the scope of Hcp values is (4.50~5.10) KA/m WC powder is as raw material, while appropriate TaC powder is used to improve the elevated temperature strength of alloy, by " high Temperature sintering ", makes the mean grain size of the coarse grained hard alloy of high temperature base finally given reach 3.2~4.0 μm, and alloy Perfect crystalline, subgrain is thick, and microstrain is small, and microhardness is high, and its wearability and toughness have obtained largely changing It is kind, the matched well of intensity and microhardness is realized, bending strength has reached 2600~3360MPa, and hardness has reached Hv30 1100~1300, so that alloy combination property is greatly improved, the competent bed drilling tool and sand making machine alloy sheet of manufacture make 20~45% with life, operating rate is also greatly improved.And by further controlling the charge ratio of TaC powder and Co powder Example, is both beneficial to improve Binder Phase composition and intergranular microstructure, improves the intensity and wearability of alloy, more significantly improve conjunction The ability of golden heat shock resistance and heat resistanceheat resistant flow, is more beneficial for the use of competent bed drilling tool and sand making machine alloy sheet.
Embodiment
In order that present disclosure is easier to be clearly understood, below according to specific embodiment, the present invention is made into One step is described in detail.
Embodiment one
From the Co powder that percentage by weight is 8.0% during dispensing, 0.4% TaC powder, surplus is WC powder, its Fisher particle size It is (4.50~4.62) KA/m for 13.0 μm, Hcp values;Using alcohol as ball-milling medium, liquid-solid ratio is 205ml/Kg, and ratio of grinding media to material is 2.72:1, Ball-milling Time is 26 hours, dries obtained compound, after compression molding, is placed in vacuum sintering furnace to enter with 1520 DEG C Row sintering.
The hard alloy for examining the present embodiment method to prepare is used as using PS21 (size is 6.5 × 5.25 × 20 ㎜) testing bars Standardized product (following examples are identical), its WC mean grain size be 3.2 μm, bending strength is 2600MPa, hardness Hv30 1250~1320.
Embodiment two
From the Co powder that percentage by weight is 9.5% during dispensing, 0.45% TaC powder, surplus is WC powder, its Fisher particle size For 15.0 μm, Hcp values be 4.50~4.58KA/m;Using alcohol as ball-milling medium, liquid-solid ratio is 205ml/Kg, and ratio of grinding media to material is 3.4:1, Ball-milling Time is 24 hours, dries obtained compound, after compression molding, is placed in vacuum sintering furnace with 1490 DEG C of progress Sintering.
The WC mean grain sizes of product are 3.8 μm, and bending strength is 2950MPa, hardness Hv301150~1220.
Embodiment three
From the Co powder that percentage by weight is 10.2% during dispensing, 0.5% TaC powder, surplus is WC powder, its Fisher particle size For 15.0 μm, Hcp values be 4.59~4.74KA/m;Using alcohol as ball-milling medium, liquid-solid ratio is 200ml/Kg, and ratio of grinding media to material is 2.72:1, Ball-milling Time is 20 hours, dries obtained compound, after compression molding, is placed in vacuum sintering furnace to enter with 1450 DEG C Row sintering.
The WC mean grain sizes of product are 3.8 μm, and bending strength is 3020MPa, hardness Hv301140~1230.
Example IV
From the Co powder that percentage by weight is 11.0% during dispensing, 0.55% TaC powder, surplus is WC powder, its Fei Shi Degree is 15.0 μm, Hcp values are 4.50~4.98KA/m;Using alcohol as ball-milling medium, liquid-solid ratio is 200ml/Kg, and ratio of grinding media to material is 2.72:1, Ball-milling Time is 14 hours, dries obtained compound, after compression molding, is placed in vacuum sintering furnace to enter with 1450 DEG C Row sintering.
The WC mean grain sizes of product are 4.0 μm, and bending strength is 2910MPa, hardness Hv301100~1170.Embodiment Five
From the Co powder that percentage by weight is 11.5% during dispensing, 0.6% TaC powder, surplus is WC powder, its Fisher particle size For 11.0 μm, Hcp values be 4.64~5.10KA/m;Using alcohol as ball-milling medium, liquid-solid ratio is 200ml/Kg, and ratio of grinding media to material is 2.72:1, Ball-milling Time is 16 hours, dries obtained compound, after compression molding, is placed in vacuum sintering furnace to enter with 1450 DEG C Row sintering.
The WC mean grain sizes of product are 4.0 μm, and bending strength is 3030MPa, hardness Hv301100~1150.The above five Hard alloy prepared by individual embodiment, realizes the matched well of alloy strength and microhardness, improves the comprehensive of hard alloy Close performance and the ability of heat shock resistance and heat resistanceheat resistant flow.
Particular embodiments described above, enters to the technical problems to be solved by the invention, technical scheme and beneficial effect Go further description, should be understood that the specific embodiment that the foregoing is only the present invention, be not used to limit The system present invention, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. should be included in Within protection scope of the present invention.

Claims (6)

1. a kind of hard alloy, it is characterised in that it is formed by following components sintering, and component and each component mass percent are as follows:
Cobalt powder:8.0%~11.5%;
Be carbonized tantalum powder:0.4%~0.6%;
Remaining is tungsten carbide powder, amounts to 100%;Wherein, the Fisher particle size of the tungsten carbide powder is 11.0~15.0 μm, the carbon The scope for changing the Hcp values of tungsten powder is (4.50~5.10) KA/m.
2. hard alloy according to claim 1, it is characterised in that:The tungsten carbide powder is prepared using reduction and carbonization method, And use content for more than 99.99% tungsten powder, in preparation process, reduction temperature be 950 DEG C~1050 DEG C, carburizing temperature For 1980 DEG C~2200 DEG C.
3. hard alloy according to claim 1, it is characterised in that:Be carbonized tantalum powder and cobalt powder proportion scale for 0.04~ 0.06:1.
4. a kind of preparation method of hard alloy as claimed any one in claims 1 to 3, it is characterised in that the step of method In contain:
(a) according to each component and each component mass percent dispensing;
(b) wet-milling;
(c) dry;
(d) it is compressing;
(e) sinter, obtain finished product.
5. preparation method according to claim 4, it is characterised in that:In described step (b), ball milling is used as using alcohol Medium, the ball material mass ratio of wet-milling is 2.5~3.5:1, liquid-solid ratio is 200~210ml/Kg, and Ball-milling Time is 13~26h.
6. preparation method according to claim 4, it is characterised in that:In described step (e), the temperature of sintering is 1440 DEG C~1520 DEG C.
CN201710384565.8A 2017-05-26 2017-05-26 Hard alloy and preparation method thereof CN107312960A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108059460A (en) * 2017-12-04 2018-05-22 株洲夏普高新材料有限公司 Hard alloy suitable for water knife sandpipe and preparation method thereof
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101121983A (en) * 2007-09-20 2008-02-13 株洲硬质合金集团有限公司 Method for preparing coarse grain hard alloy
CN101664809A (en) * 2009-10-09 2010-03-10 株洲硬质合金集团有限公司 Uniform macromeritic tungsten powder and method for preparing tungsten carbide powder
CN101824574A (en) * 2010-05-14 2010-09-08 山东硬质合金有限公司 Method for preparing extra-coarse grained carbide alloy
CN102517467A (en) * 2012-01-06 2012-06-27 周毅 Method for preparing coarse-grain hard alloy
CN103570019A (en) * 2012-08-03 2014-02-12 北京有色金属研究总院 Extra-coarse grain tungsten carbide powder with narrow particle size distribution and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101121983A (en) * 2007-09-20 2008-02-13 株洲硬质合金集团有限公司 Method for preparing coarse grain hard alloy
CN101664809A (en) * 2009-10-09 2010-03-10 株洲硬质合金集团有限公司 Uniform macromeritic tungsten powder and method for preparing tungsten carbide powder
CN101824574A (en) * 2010-05-14 2010-09-08 山东硬质合金有限公司 Method for preparing extra-coarse grained carbide alloy
CN102517467A (en) * 2012-01-06 2012-06-27 周毅 Method for preparing coarse-grain hard alloy
CN103570019A (en) * 2012-08-03 2014-02-12 北京有色金属研究总院 Extra-coarse grain tungsten carbide powder with narrow particle size distribution and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108059460A (en) * 2017-12-04 2018-05-22 株洲夏普高新材料有限公司 Hard alloy suitable for water knife sandpipe and preparation method thereof
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

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