CN109468517A - A kind of preparation method and application of pile foundation engineering hard alloy - Google Patents
A kind of preparation method and application of pile foundation engineering hard alloy Download PDFInfo
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- CN109468517A CN109468517A CN201811637917.7A CN201811637917A CN109468517A CN 109468517 A CN109468517 A CN 109468517A CN 201811637917 A CN201811637917 A CN 201811637917A CN 109468517 A CN109468517 A CN 109468517A
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- hard alloy
- pile foundation
- foundation engineering
- preparation
- tungsten carbide
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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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- 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
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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
- C22C29/067—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 comprising a particular metallic binder
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of preparation method and application of pile foundation engineering hard alloy, belong to powder metallurgical technology, it include: the tungsten carbide powder that (1) selection Fisher particle size is 9.0~17.0 μm, according to tungsten carbide powder: 93.5wt%~94.5wt%, cobalt powder: the raw material of 5.5wt%~6.5wt% is than carrying out ingredient；(2) wet-milling is carried out to raw material；(3) spray drying granulation；(4) green compact is made, is placed in argon gas and carries out pressure sintering.The present invention ensure that hard alloy has good wearability by the cobalt content control of hard alloy in low cobalt content range by the control to hard alloy ingredient；Selecting Fisher particle size is 9.0~17.0 μm of tungsten carbide powder, and the final tungsten carbide mean grain size controlled in hard alloy improves the toughness of hard alloy in 2.0~2.4 μm of middle coarse-grain particle size range；Diameter >=600mm pile foundation engineering hard alloy spherical-teeth is made in Cemented Carbide Hardness HV3:1240~1370 of preparation, bending strength >=2300MPa, the drilling construction of the large aperture bored concrete pile foundation suitable for possessing competent bed.
Description
Technical field
The invention belongs to powder metallurgical technologies, and in particular to a kind of preparation method of pile foundation engineering hard alloy and
Using.
Background technique
Hard alloy is mainly made of hard phase (tungsten carbide) and Binder Phase (metallic cobalt), with excellent hardness, by force
Degree is widely used in the industrial circles such as intermetallic composite coating, engineering machinery, grinding tool manufacture.Bridge, airport, high-speed rail, harbour and
In the infrastructural projects such as heavy construction, bearing capacity of single pile is stronger, the lower large aperture bored concrete pile foundation of cost and construction method
It is gradually replacing traditional basis and construction method, the drilling of pile foundation engineering is towards large aperture, the direction of hard rock deep foundation
Development, some industrially developed country start to manufacture large aperture pneumatic down-hole hammer, and the hard rock drilling for all kinds of pile foundation engineerings is constructed.
It is Large Diameter DTH Hammer drill hammer that the main component of crushed rocks is dug in the pneumatic down-hole hammer boring procedure of large aperture, is embedded on drill bit
Hard alloy spherical-teeth directly impact and rock cutting.In the ground bore forming for possessing hard rock, it is embedded in Large Diameter DTH Hammer
Button on drill hammer bears biggish impact force and the button (abbreviation heel teeth) at frictional force, especially drill margin position is easy
There is broken tooth, seriously affects drilling life of bit.The hard alloy for researching and developing high rigidity, high-wearing feature, the new grades of high tenacity, prolongs
The service life of long drill bit, becomes urgent problem to be solved.
The cobalt content of existing frequently-used hard alloy spherical-teeth is generally 6~11.5%, the crystal grain of tungsten carbide be middle crystal grain or
Coarse grain, button that these are mining are assembled into the down-the-hold drill bit that diameter is 40~400mm, are mainly used in mining, rock drilling etc., use
Effect is preferable.When these buttons are assembled into diameter >=600mm Large Diameter DTH Hammer drill bit, the drilling large aperture bored concrete pile on hard rock
During datum hole hole, the high hard alloy spherical-teeth wearability of cobalt content is insufficient, and the low hard alloy spherical-teeth of cobalt content occurs a large amount of
Broken teeth causes drilling life of bit lower.
Patent 201680018387.0 discloses a kind of manufacturing method of rotary rock drill button, and this method is related in hard alloy
The middle Cr that certain content is added, and WC grain size average in alloy is required to be higher than 1.75 μm, to improve the corrosion-resistant of button
Wear-resisting property during ability and use.The preparation method is all to reach to change hard alloy physical force by addition chromium
The purpose of performance is learned, but adds the promotion that chromium is unfavorable for hard alloy toughness, it is difficult to meet diameter >=600mm pile foundation work
The requirement of journey drill bit.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of preparation sides of pile foundation engineering hard alloy
The hard of middle coarse grain carbonization tungsten structure can be obtained by adjusting the cobalt content of alloy and the grain size of tungsten carbide in method and application
Alloy improves the toughness and wearability of hard alloy, and gained hard alloy is used applied to diameter >=600mm pile foundation engineering
Drill bit.
The preparation method of this pile foundation engineering hard alloy provided by the invention, comprising the following steps:
(1) selecting Fisher particle size is 9.0~17.0 μm of tungsten carbide powder, according to tungsten carbide powder: 93.5wt%~
94.5wt%, cobalt powder: the raw material of 5.5wt%~6.5wt% is than carrying out ingredient；
(2) control the ratio between grinding rod and raw material is 2.5~3.0:1, carries out wet-milling, keeps Coarse Tungsten Carbide Powder sufficiently broken,
And it is uniformly mixed with cobalt powder；
(3) spray drying granulation will be carried out after the slurries filtration after wet-milling, obtains alloy powder mixture；
(4) green compact is made in alloy powder mixture, is placed in argon gas and carries out pressure sintering, obtained the pile foundation engineering and use
Hard alloy.
For the toughness and wearability for further increasing hard alloy, it is preferred that the Fisher particle size of the tungsten carbide powder is 9.1
~13.0 μm.
Preferably, the wet grinding media is alcohol, and liquid-solid ratio is 200~240ml/kg.
Preferably, the revolving speed of the wet-milling process is 34~36r/min, and the wet-milling time is 18~28h.
Preferably, furnace pressure >=50bar of the pressure sintering, sintering temperature are 1410~1480 DEG C, soaking time 1.0
~1.5h.
The inventive concept total as one, the present invention also provides the applications of the pile foundation engineering hard alloy, by gained
Hard alloy is applied to diameter >=600mm pile foundation engineering drill bit.
Compared with the prior art, advantageous effects of the invention:
The present invention is controlled the cobalt content of hard alloy in low cobalt content range by the control to hard alloy ingredient,
It ensure that hard alloy has good wearability；Selecting Fisher particle size is 9.0~17.0 μm of tungsten carbide powder, and final control is hard
Tungsten carbide mean grain size in matter alloy improves the toughness of hard alloy in 2.0~2.4 μm of middle coarse-grain particle size range；
Cemented Carbide Hardness HV3:1240~1370 of preparation, bending strength >=2300MPa are used for gained hard alloy to make diameter
The pile foundation engineering hard alloy spherical-teeth of >=600mm is applied suitable for possessing the drilling of large aperture bored concrete pile foundation of competent bed
Work.
Detailed description of the invention
Fig. 1 is the metallographic microscope of 2 pile foundation engineering hard alloy of the embodiment of the present invention.
Fig. 2 is to be bored using diameter >=600mm pile foundation engineering made of pile foundation engineering hard alloy of the present invention
Head picture.
Specific embodiment
It is intended to further illustrate the present invention with reference to embodiments, is not intended to limit the present invention.
Embodiment 1
Making a kind of pile foundation engineering hard alloy, cobalt content is 6.5% (mass percent, similarly hereinafter), surplus WC,
Fisher particle size is 9.10 μm, and using alcohol as wet grinding media, the mass ratio of liquid-solid ratio 240ml/Kg, grinding rod and material are 2.5:
1, revolving speed 34r/min, wet-milling time are 28 hours, and green compact is placed in sintering furnace by dry obtained mixture, compression moulding,
In 1410 DEG C of pressure sinterings, pressure >=50bar, diameter >=600mm pile foundation engineering drill bit is made in soaking time 1.5h,
Cemented Carbide Properties and grain size used by drill bit are shown in Table 1.
Embodiment 2
A kind of pile foundation engineering hard alloy is made, cobalt content 6.0%, surplus WC, Fisher particle size is 11.70 μ
M, using alcohol as wet grinding media, liquid-solid ratio 220ml/Kg, the mass ratio of grinding rod and material is 3.0:1, revolving speed 36r/
Min, wet-milling time are 22 hours, and green compact is placed in sintering furnace, pressurizes at 1450 DEG C by dry obtained mixture, compression moulding
Sintering, pressure >=50bar, soaking time 1.0h are made diameter >=600mm pile foundation engineering drill bit, used by drill bit
Cemented Carbide Properties and grain size are shown in Table 1.Fig. 1 is the metallographic microscope of hard alloy, and Fig. 2 is to utilize pile foundation engineering hard of the present invention
Diameter >=600mm pile foundation engineering drill bit made of alloy.
Embodiment 3
A kind of pile foundation engineering hard alloy is made, cobalt content 5.5%, surplus WC, Fisher particle size is 17.00 μ
M, using alcohol as wet grinding media, liquid-solid ratio 200ml/Kg, the mass ratio of grinding rod and material is 2.72:1, revolving speed 36r/
Min, wet-milling time are 18 hours, and green compact is placed in sintering furnace, pressurizes at 1480 DEG C by dry obtained mixture, compression moulding
Diameter >=600mm pile foundation engineering drill bit, used hard is made in sintering, pressure >=50bar, soaking time 1.0h
Alloy property and grain size are shown in Table 1.
Comparative example
WC:80% by mass percentage, Co:20% weigh raw material, and the Fisher particle size of WC is 30.0 μm, according to embodiment
2 identical process conditions, through ingredient, wet-milling, drying and granulating, diameter >=600mm pile foundation engineering is made in compression moulding, sintering
With drill bit, Cemented Carbide Properties used by drill bit and grain size are shown in Table 1.
Cemented Carbide Properties and grain size in 1 Examples 1 to 3 of table and comparative example
As it can be seen from table 1 the vickers hardness hv 3 of the hard alloy in Examples 1 to 3 is higher than comparative example hard alloy,
Its bending strength and comparative example hard alloy are close, and the tungsten carbide mean grain size of hard alloy is thick in 2.0~2.4 μm
Grain size range, illustrating the hard alloy in Examples 1 to 3 not only has good toughness, but also its hard alloy is wear-resisting
Property be better than comparative example hard alloy；The tungsten carbide mean grain size of comparative example hard alloy reaches 3.2 μm, this performance and structure
Although alloy ductility it is higher, hardness is lower, the hard-metal insert wearability in the Construction of Pile Bedding Boring containing competent bed
Deficiency reduces drilling life of bit.
Claims (6)
1. a kind of preparation method of pile foundation engineering hard alloy, which comprises the following steps:
(1) selecting Fisher particle size is 9.0~17.0 μm of tungsten carbide powder, according to tungsten carbide powder: 93.5wt%~94.5wt%, cobalt
Powder: the raw material of 5.5wt%~6.5wt% is than carrying out ingredient；
(2) control the ratio between grinding rod and raw material is 2.5~3.0:1, carries out wet-milling, keeps Coarse Tungsten Carbide Powder sufficiently broken, and with
Cobalt powder is uniformly mixed；
(3) spray drying granulation will be carried out after the slurries filtration after wet-milling, obtains alloy powder mixture；
(4) green compact is made in alloy powder mixture, is placed in argon gas and carries out pressure sintering, obtain the pile foundation engineering hard
Alloy.
2. the preparation method of pile foundation engineering hard alloy according to claim 1, which is characterized in that the tungsten carbide powder
Fisher particle size is 9.1~13.0 μm.
3. the preparation method of pile foundation engineering hard alloy according to claim 1, which is characterized in that the wet grinding media is
Alcohol, liquid-solid ratio are 200~240ml/kg.
4. the preparation method of pile foundation engineering hard alloy according to claim 1, which is characterized in that the wet-milling process
Revolving speed is 34~36r/min, and the wet-milling time is 18~28h.
5. the preparation method of pile foundation engineering hard alloy according to claim 1, which is characterized in that the pressure sintering
Furnace pressure >=50bar, sintering temperature are 1410~1480 DEG C, and soaking time is 1.0~1.5h.
6. the application of any one pile foundation engineering hard alloy according to claim 1~6, which is characterized in that gained is hard
Matter Alloyapplication is in diameter >=600mm pile foundation engineering drill bit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811637917.7A CN109468517A (en) | 2018-12-29 | 2018-12-29 | A kind of preparation method and application of pile foundation engineering hard alloy |
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| CN201811637917.7A CN109468517A (en) | 2018-12-29 | 2018-12-29 | A kind of preparation method and application of pile foundation engineering hard alloy |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101648213A (en) * | 2009-08-31 | 2010-02-17 | 株洲硬质合金集团有限公司 | Hard alloy roll collar for finished frame of high-speed wire mill and preparation method thereof |
| CN101705382A (en) * | 2009-11-30 | 2010-05-12 | 杭州天石硬质合金有限公司 | Preparation method of superfine hard alloy |
| 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 |
| CN101985717A (en) * | 2010-11-13 | 2011-03-16 | 湖南三三合金集团有限公司 | Method for preparing high-tenacity super-coarse-grained tungsten and cobalt hard alloy |
| CN105734321A (en) * | 2016-03-01 | 2016-07-06 | 株洲硬质合金集团有限公司 | Preparing method for ultra-fine hard alloy |
| CN107312960A (en) * | 2017-05-26 | 2017-11-03 | 株洲夏普高新材料有限公司 | Hard alloy and preparation method thereof |
-
2018
- 2018-12-29 CN CN201811637917.7A patent/CN109468517A/en active Pending
Patent Citations (7)
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| CN101648213A (en) * | 2009-08-31 | 2010-02-17 | 株洲硬质合金集团有限公司 | Hard alloy roll collar for finished frame of high-speed wire mill and preparation method thereof |
| CN101705382A (en) * | 2009-11-30 | 2010-05-12 | 杭州天石硬质合金有限公司 | Preparation method of superfine hard alloy |
| 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 |
| CN101985717A (en) * | 2010-11-13 | 2011-03-16 | 湖南三三合金集团有限公司 | Method for preparing high-tenacity super-coarse-grained tungsten and cobalt hard alloy |
| CN104928512A (en) * | 2010-11-13 | 2015-09-23 | 湖南世纪钨材股份有限公司 | Method for preparing ultra-coarse-grain tungsten-cobalt hard alloy |
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