CN1267571C - Process for preparing tungsten-cobalt hard alloy - Google Patents
Process for preparing tungsten-cobalt hard alloy Download PDFInfo
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- CN1267571C CN1267571C CN 200310120820 CN200310120820A CN1267571C CN 1267571 C CN1267571 C CN 1267571C CN 200310120820 CN200310120820 CN 200310120820 CN 200310120820 A CN200310120820 A CN 200310120820A CN 1267571 C CN1267571 C CN 1267571C
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 24
- 239000000956 alloy Substances 0.000 title claims abstract description 24
- JPNWDVUTVSTKMV-UHFFFAOYSA-N cobalt tungsten Chemical compound [Co].[W] JPNWDVUTVSTKMV-UHFFFAOYSA-N 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 title 1
- 239000000843 powder Substances 0.000 claims abstract description 76
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 239000011362 coarse particle Substances 0.000 claims description 18
- 239000010419 fine particle Substances 0.000 claims description 18
- 239000011230 binding agent Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 230000003179 granulation Effects 0.000 claims description 10
- 238000005469 granulation Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 10
- 238000001238 wet grinding Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 3
- 239000008187 granular material Substances 0.000 abstract 4
- 239000004503 fine granule Substances 0.000 abstract 2
- 238000007493 shaping process Methods 0.000 abstract 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 7
- 239000002244 precipitate Substances 0.000 description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 229910000531 Co alloy Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
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- Powder Metallurgy (AREA)
Abstract
The present invention discloses a method for preparing tungsten-cobalt hard alloy, which comprises steps that WC powder and (6 to 8)wt% of Co powder are blended, milled in a wet mode, dried, mixed with a shaping agent to be granulated, pressed, and shaped, removes the shaping agent, are sintered, etc. During blending, the WC powder of coarse granules and fine granules is used, wherein the granularity of the coarse granule WC powder is from 20 to 30 mum, the granularity of the fine granule WC powder is from 1.2 to 1.8 mum, and the weight ratio of the coarse granule WC powder to the fine granule WC powder is 60:40 to 80:20. The method of the present invention can be used for effectively coordinating the abrasion resistance and the toughness of the hard alloy, improving the combination property of the alloy, and enlarging the application range of alloy for mines.
Description
One, technical field
The present invention relates to a kind of preparation method's of tungsten-cobalt hard alloy, particularly mining tungsten-cobalt hard alloy preparation method.
Two, background technology
At present, a series hard alloy of using in the rock drilling field is that cobalt contents is the middle coarse grain tungsten cobalt alloy of (6～8) wt%.The preparation method of such alloy generally comprise with WC powder and Co powder through batching, wet-milling, drying, mix binder granulation, press forming, take off steps such as forming agent, sintering, wherein the size range of WC powder is at (4～13) μ m, the Co content range is controlled at (6～8) wt%, the alloy of producing like this, its hardness value is for being generally (88.0～90.5) HRA, intensity level is generally (1800～2600) MPa, and notched bar impact strength is generally (3.0～4.0) J/cm
2The wear resistance of such alloy is fabulous, but toughness is lower, and therefore, the use range of this alloy is restricted, and generally is applicable to the rock stratum that the f=10 level is following.
Three, summary of the invention
The present invention aims to provide a kind of preparation method of tungsten cobalt alloy, coordinates its wear resistance and toughness effectively, improves the over-all properties of alloy, enlarges the range of application of mine alloy, and the alloy of super quality and competitive price is provided for the rock drilling field.
In order to reach this purpose, technical scheme of the present invention comprise Co powder with WC powder and (6～8) wt% through batching, wet-milling, drying, mix binder granulation, press forming, take off steps such as forming agent, sintering, select two kinds of particulate WC of thickness powder during batching for use, wherein the granularity of coarse particles WC powder is (20～30) μ m, the granularity of fine particle WC powder is (1.2～1.8) μ m, and the weight ratio of coarse particles WC powder and fine particle WC powder is 60: 40～80: 20.
Owing to adopted the WC grain heterogeneous texture, alloy structure improves: the WC grain adjacent degree reduces, and Co is more evenly distributed mutually, and porosity reduces, and formation of crack significantly reduces.Make the wear resistance of this alloy and toughness all be better than the coarse grain alloy with cobalt, this hardness of alloy value is (88.0～90.0) HRA, and intensity level is (2000～2800) MPa, and notched bar impact strength is (3.5～4.5) J/cm
2Because this alloy has the high-wearing feature and the high toughness of low cobalt alloy simultaneously,, can be used for the following rock stratum of f=12 level so its range of application obtains expanding.
As a further improvement on the present invention, adopt thin cobalt powder (1.0～1.5) μ m than better with the performance of common cobalt powder (2～3) μ m, its tough performance improves 5～10%, and after adding the TaC of (0.3～0.6) wt%, its hardness (HRA) improves 0.2～0.3, and promptly its wear resistance also can be enhanced.
Four, embodiment
Embodiment 1: the Co powder of two kinds of WC powder of thickness and 8.0wt% is prepared burden by certain requirement, wet-milling discharging after 20～23 hours, precipitate 5～8 hours, drying shake sieve, mix binder granulation, press forming, take off forming agent and 1450 ℃ the insulation 50 minutes steps such as sintering make Wimet.Wherein, the granularity of coarse particles WC powder is 24.0 μ m when batching, and the granularity of fine particle WC powder is 1.4 μ m, and the weight ratio of coarse particles WC powder and fine particle WC powder is 70: 30, and Co powder degree is 2.0 μ m.
Embodiment 2: the Co powder of two kinds of WC powder of thickness and 7.0wt% is prepared burden by certain requirement, wet-milling discharging after 20～23 hours, precipitate 5～8 hours, drying shake sieve, mix binder granulation, press forming, take off forming agent and 1450 ℃ the insulation 50 minutes steps such as sintering make Wimet.Wherein, the granularity of coarse particles WC powder is 28.4 μ m when batching, and the granularity of fine particle WC powder is 1.2 μ m, and the weight ratio of coarse particles WC powder and fine particle WC powder is 70: 30, and Co powder degree is 1.0 μ m.
Embodiment 3: the Co powder of two kinds of WC powder of thickness and 6.0wt% is prepared burden by certain requirement, wet-milling discharging after 20～23 hours, precipitate 5～8 hours, drying shake sieve, mix binder granulation, press forming, take off forming agent and 1450 ℃ the insulation 50 minutes steps such as sintering make Wimet.Wherein, the granularity of coarse particles WC powder is 20.0 μ m when batching, and the granularity of fine particle WC powder is 1.8 μ m, and the weight ratio of coarse particles WC powder and fine particle WC powder is 70: 30, and Co powder degree is 1.5 μ m.
Embodiment 4: the Co powder of two kinds of WC powder of thickness, 6.0wt% and the TaC of 0.3wt% are prepared burden by certain requirement, wet-milling discharging after 20～23 hours, precipitate 5～8 hours, drying shake sieve, mix binder granulation, press forming, take off forming agent and 1450 ℃ the insulation 50 minutes steps such as sintering make Wimet.Wherein, the granularity of coarse particles WC powder is 30.0 μ m when batching, and the granularity of fine particle WC powder is 1.4 μ m, and the weight ratio of coarse particles WC powder and fine particle WC powder is 60: 40, and Co powder degree is 2.6 μ m.
Embodiment 5: the Co powder of two kinds of WC powder of thickness and 6.0wt% is prepared burden by certain requirement, wet-milling discharging after 20～23 hours, precipitate 5～8 hours, drying shake sieve, mix binder granulation, press forming, take off forming agent and 1450 ℃ the insulation 50 minutes steps such as sintering make Wimet.Wherein, the granularity of coarse particles WC powder is 24.0 μ m when batching, and the granularity of fine particle WC powder is 1.4 μ m, and the weight ratio of coarse particles WC powder and fine particle WC powder is 80: 20, and Co powder degree is 3.0 μ m.
Embodiment 6: the Co powder of two kinds of WC powder of thickness, 8.0wt% and the TaC of 0.5wt% are prepared burden by certain requirement, wet-milling discharging after 20～23 hours, precipitate 5～8 hours, drying shake sieve, mix binder granulation, press forming, take off forming agent and 1450 ℃ the insulation 50 minutes steps such as sintering make Wimet.Wherein, the granularity of coarse particles WC powder is 24.0 μ m when batching, and the granularity of fine particle WC powder is 1.4 μ m, and the weight ratio of coarse particles WC powder and fine particle WC powder is 70: 30, and Co powder degree is 3.0 μ m.
Embodiment 7: the Co powder of two kinds of WC powder of thickness, 7.0wt% and the TaC of 0.6wt% are prepared burden by certain requirement, wet-milling discharging after 20～23 hours, precipitate 5～8 hours, drying shake sieve, mix binder granulation, press forming, take off forming agent and 1450 ℃ the insulation 50 minutes steps such as sintering make Wimet.Wherein, the granularity of coarse particles WC powder is 24.0 μ m when batching, and the granularity of fine particle WC powder is 1.4 μ m, and the weight ratio of coarse particles WC powder and fine particle WC powder is 70: 30, and Co powder degree is 1.34 μ m.
Table 1 has been listed the granularity and the concrete proportioning of powder when embodiment 1 prepares burden in 7, table 2 provides hardness, intensity and the notched bar impact strength of the Wimet of the method preparation of adopting embodiment 1 to 7.
Table 1
| Numbering | Co Wt％ | WC Wt％ | Wc grain size (μ m) | Co powder degree (μ m) | TaC Wt％ | WC thickness ratio (weight ratio) | |
| Slightly | Carefully | ||||||
| 1 | 8.0 | Surplus | 24.0 | 1.4 | 2.0 | 0 | 70∶30 |
| 2 | 7.0 | Surplus | 28.4 | 1.2 | 1.0 | 0 | 70∶30 |
| 3 | 6.0 | Surplus | 20 | 1.8 | 1.5 | 0 | 70∶30 |
| 4 | 6.0 | Surplus | 30 | 1.4 | 2.6 | 0.3 | 60∶40 |
| 5 | 6.0 | Surplus | 24.0 | 1.4 | 3.0 | 0 | 80∶20 |
| 6 | 8.0 | Surplus | 24.0 | 1.4 | 3.0 | 0.5 | 70∶30 |
| 7 | 7.0 | Surplus | 24.0 | 1.4 | 1.34 | 0.6 | 70∶30 |
Table 2
Claims (3)
1, a kind of preparation method of tungsten-cobalt hard alloy, comprise Co powder with WC powder and 6～8wt% through batching, wet-milling, drying, mix binder granulation, press forming, take off forming agent, sintering step, it is characterized in that: select two kinds of particulate WC of thickness powder during batching for use, wherein the granularity of coarse particles WC powder is 20～30 μ m, the granularity of fine particle WC powder is 1.2～1.8 μ m, and the weight ratio of coarse particles WC powder and fine particle WC powder is 60: 40～80: 20.
2, the preparation method of tungsten-cobalt hard alloy according to claim 1 is characterized in that: the Co powder of selecting 1.0～1.5 μ m during batching for use.
3, according to the preparation method of claim 1 or 2 described tungsten-cobalt hard alloys, it is characterized in that: the TaC that adds 0.3～0.6wt% during batching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310120820 CN1267571C (en) | 2003-12-29 | 2003-12-29 | Process for preparing tungsten-cobalt hard alloy |
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| CN 200310120820 CN1267571C (en) | 2003-12-29 | 2003-12-29 | Process for preparing tungsten-cobalt hard alloy |
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| CN1554790A CN1554790A (en) | 2004-12-15 |
| CN1267571C true CN1267571C (en) | 2006-08-02 |
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| CN 200310120820 Expired - Lifetime CN1267571C (en) | 2003-12-29 | 2003-12-29 | Process for preparing tungsten-cobalt hard alloy |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655334A (en) * | 2009-09-07 | 2010-02-24 | 浙江正理生能科技有限公司 | Nano hydrophilic film for evaporator in air source heat pump water heater and manufacturing method thereof |
| CN101880809B (en) * | 2010-06-09 | 2011-12-14 | 株洲肯特硬质合金有限公司 | Hard alloy for spherical tooth drill bit suitable for welding processing |
| CN102758112A (en) * | 2012-08-10 | 2012-10-31 | 王永富 | Micron-nano WC-Co hard alloy, preparation process and application thereof |
| CN103614604B (en) * | 2013-12-16 | 2016-02-03 | 重庆市科学技术研究院 | For mining Wimet of rotary drilling cut drill and preparation method thereof |
| CN111187960A (en) * | 2019-12-31 | 2020-05-22 | 株洲硬质合金集团有限公司 | Double-crystal hard alloy and preparation method thereof |
| CN111218576B (en) * | 2020-02-25 | 2022-01-18 | 自贡硬质合金有限责任公司 | Preparation method of heterogeneous alloy |
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