CN106041092A - Method for low-pressure sintering formation of guide wheel of guide fitting based on WC-10Co cemented carbide - Google Patents
Method for low-pressure sintering formation of guide wheel of guide fitting based on WC-10Co cemented carbide Download PDFInfo
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- CN106041092A CN106041092A CN201610693728.6A CN201610693728A CN106041092A CN 106041092 A CN106041092 A CN 106041092A CN 201610693728 A CN201610693728 A CN 201610693728A CN 106041092 A CN106041092 A CN 106041092A
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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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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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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Abstract
The invention discloses a method for low-pressure sintering formation of a guide wheel of a guide fitting based on WC-10Co cemented carbide. The method includes subjecting 60-75% of WC powder, 6-7.5% of Co powder and 0.6-0.75% of grain inhibitors to wet grinding, screening, drying and low-pressure sintering formation. The method for low-pressure sintering formation of the guide wheel of the guide fitting based on the WC-10Co cemented carbide has the advantages that a guide wheel structure of the guide fitting, maximum in hardness, is obtained through control of low-pressure sintering formation temperature, and structural density during sintering is improved through addition of the mixed inhibitors such as VC and Gr5C3; structural hardness of the guide wheel of the guide fitting is enhanced through control of time, inhibitor ratio and temperature, so that service life of the guide wheel of the guide fitting is prolonged.
Description
Technical field
The invention belongs to mill guide wheel technical field, particularly relate to a kind of based on WC-10Co hard alloy low pressure sintering
The method of molding mill guide wheel.
Background technology
Guide wheel is the important spare part that consumption is bigger in hot rolled rod production line, is the crucial portion in steel rolling guide assembly
Part, the shadow land measure equal to fifteen mu in most parts of the Northeast the technical-economic indexes such as operating rate of rolling mill.The a lot of guide and guard part heat resistances used are not enough, occur that steel bonding etc. shows
As, also have some process conditions wearabilities, thermal fatigue property bad, have impact on service life and mill bar quality.
The physical essence of hardness abrasion is the fracture process of a kind of specific form, occurs at the top layer of wear-out part and Ya Biao
Layer.When considering hardness number, it is impossible to simply think that hardness more high-wearing feature is the best, its under various regimes hard to be taken into full account
Degree.Such as: the hardness changed due to Surface hardened layer or softening in work process；Surface is made owing to contacting with high temperature rolled piece
Temperature raises, and will consider temperature hardness.
Toughness rolls the fracture of guide wheel and is generally brittle fracture.For preventing the generation of brittle failure, resisting of material to be improved constantly
Fracture energy.
WC-Co hard alloy is that the development of the tool materials of a kind of superior performance, nanometer composite technology and material is noted to it
Enter new vitality so that it is efficiently solve the contradiction between conventional rigid alloy strength and hardness, it is achieved that " double high ",
A lot of fields are widely used.
WC base cemented carbide experienced by ordinary rigid alloy, sub-micro thin (0.5-1.0 μm crystal grain hard alloy, ultra-fine (0.1-
0.5 μm) so nanocrystal hard alloy three develop on a large scale the stage.Hard alloy manufacture was developed into one by small-scale production already
The most independent individual industrial system, hard alloy becomes indispensable instrument in nearly all industrial department and new technical field
Material and structural material.
The rich knot of low pressure sinters also known as overvoltage, refers to that alloy uses noble gas to do pressure medium in high-temperature region, equal to alloy
Even applying pressure, so that alloy is the finest and close.The pressure of low pressure sintering is generally between a few MPa to tens MPa.Because should
Method can well eliminate the hole in alloy and cobalt pond, inhibiting grain growth, can large batch of produce again, the most simultaneously
It is a kind of common method the most industrially sintering superfine WC-Co alloy, present domestic several big CEMENTED CARBIDE PRODUCTION
Zhuzhou hard alloy group of producer, Xiamen gold kagu industry company limited etc. produce solid carbide blank and are also adopted by low pressure
Sintering.
Summary of the invention
It is an object of the invention to provide a kind of side based on WC-10Co hard alloy low pressure sintering molding mill guide wheel
Method, by by controlling the temperature of low pressure sintering molding and then obtaining the mill guide wheel structure of maximum hardness, by the VC added
And Gr5C3Density of texture during sintering is improved Deng mixed inhibitor；Carried by control time, the proportioning of inhibitor and temperature
The structural rigidity of high mill guide wheel, and then improve the service life of mill guide wheel.
For solving above-mentioned technical problem, the present invention is achieved by the following technical solutions:
The present invention is a kind of method based on WC-10Co hard alloy low pressure sintering molding mill guide wheel, including walking as follows
Rapid:
Step one, the WC powder of dispensing: 60%-75%, 6%-7.5%Co powder and 0.6%-0.75% grain inhibitor
The preparation of A ultra-fine WC powder: graphite powder and tungsten powder are placed in ball mill in the ratio of atomic ratio 1:1, at hydrogen
The lower ball milling 50h-150h of protection, has synthesized the WC powder body that grain size is 7.0-7.5 circle；
The preparation of B Co powder: Co powder is placed in ball mill, ball milling 30h-50h under hydrogen shield, form 0.7-0.9 μm
Co powder；
C grain inhibitor: include the Gr of VC and 25%-40% of 60%-75%5C3；
Step 2, wet grinding: dispensing step one prepared joins in tank, with liquid ethanol as ball-milling medium, A and B
Ratio of grinding media to material be 10:1, in mechanical milling process add forming agent, the rotating speed of ball mill is at 90-100r/min；
Step 3, sieves and is dried: sieved by the powder of step 2 milled, places in vacuum drying oven and is dried,
Then compressing on tablet machine, it is finally putting in sintering furnace；
Step 4, low pressure sintering: sintering temperature is controlled the scope at 1280 DEG C-1400 DEG C, it is incubated 25-35min, i.e. makes
Obtain this mill guide wheel.
The method have the advantages that
The present invention is by controlling the temperature of low pressure sintering molding and then obtaining the mill guide wheel structure of maximum hardness, by adding
VC and Gr added5C3Density of texture during sintering is improved Deng mixed inhibitor；The sintering characteristic of superfine alloy and the cobalt in formula
Phase content, WC powder carbon content and its grain size are relevant, and during with agglomerating plant, sintering atmosphere, sintering temperature, insulation
Between, sintering pressure, grain inhibitor content and kind etc. relevant, improved by control time, the proportioning of inhibitor and temperature
The structural rigidity of mill guide wheel, and then improve the service life of mill guide wheel.
Certainly, the arbitrary product implementing the present invention it is not absolutely required to reach all the above advantage simultaneously.
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based in the present invention
Embodiment, all other embodiments that those of ordinary skill in the art are obtained under not making creative work premise, all
Belong to the scope of protection of the invention.
Embodiment one
A kind of method based on WC-10Co hard alloy low pressure sintering molding mill guide wheel, following steps:
Step one, the WC powder of dispensing: 60%-75%, 6%-7.5%Co powder and 0.6%-0.75% grain inhibitor
The preparation of A ultra-fine WC powder: graphite powder and tungsten powder are placed in ball mill in the ratio of atomic ratio 1:1, at hydrogen
The lower ball milling 50h-150h of protection, has synthesized the WC powder body that grain size is 7.0-7.5 circle；
The preparation of B Co powder: Co powder is placed in ball mill, ball milling 30h-50h under hydrogen shield, form 0.7-0.9 μm
Co powder；
C grain inhibitor: include the Gr of VC and 25%-40% of 60%-75%5C3；
Step 2, wet grinding: dispensing step one prepared joins in tank, with liquid ethanol as ball-milling medium, A and B
Ratio of grinding media to material be 10:1, in mechanical milling process add forming agent, the rotating speed of ball mill is at 90-100r/min；
Step 3, sieves and is dried: sieved by the powder of step 2 milled, places in vacuum drying oven and is dried,
Then compressing on tablet machine, it is finally putting in sintering furnace；
Step 4, low pressure sintering: sintering temperature is controlled at 1300 DEG C, it is incubated 30min, i.e. prepares this mill guide wheel.
When sintering temperature 1300 DEG C, the tissue relative density of this mill guide wheel is 84.2%, and hardness belongs to preliminary growth
Stage.
Embodiment two
A kind of method based on WC-10Co hard alloy low pressure sintering molding mill guide wheel, following steps:
Step one, the WC powder of dispensing: 60%-75%, 6%-7.5%Co powder and 0.6%-0.75% grain inhibitor
The preparation of A ultra-fine WC powder: graphite powder and tungsten powder are placed in ball mill in the ratio of atomic ratio 1:1, at hydrogen
The lower ball milling 50h-150h of protection, has synthesized the WC powder body that grain size is 7.0-7.5 circle；
The preparation of B Co powder: Co powder is placed in ball mill, ball milling 30h-50h under hydrogen shield, form 0.7-0.9 μm
Co powder；
C grain inhibitor: include the Gr of VC and 25%-40% of 60%-75%5C3；
Step 2, wet grinding: dispensing step one prepared joins in tank, with liquid ethanol as ball-milling medium, A and B
Ratio of grinding media to material be 10:1, in mechanical milling process add forming agent, the rotating speed of ball mill is at 90-100r/min；
Step 3, sieves and is dried: sieved by the powder of step 2 milled, places in vacuum drying oven and is dried,
Then compressing on tablet machine, it is finally putting in sintering furnace；
Step 4, low pressure sintering: sintering temperature is controlled at 1360 DEG C, it is incubated 30min, i.e. prepares this mill guide wheel.
When sintering temperature 1360 DEG C, the tissue relative density of this mill guide wheel is 98.6%, has higher compactness,
Due to liquid phase flowing wet granulate phase, space is filled, and sintered body occurs bigger contraction so that density of texture increases.
Embodiment three
A kind of method based on WC-10Co hard alloy low pressure sintering molding mill guide wheel, following steps:
Step one, the WC powder of dispensing: 60%-75%, 6%-7.5%Co powder and 0.6%-0.75% grain inhibitor
The preparation of A ultra-fine WC powder: graphite powder and tungsten powder are placed in ball mill in the ratio of atomic ratio 1:1, at hydrogen
The lower ball milling 50h-150h of protection, has synthesized the WC powder body that grain size is 7.0-7.5 circle；
The preparation of B Co powder: Co powder is placed in ball mill, ball milling 30h-50h under hydrogen shield, form 0.7-0.9 μm
Co powder；
C grain inhibitor: include the Gr of VC and 25%-40% of 60%-75%5C3；
Step 2, wet grinding: dispensing step one prepared joins in tank, with liquid ethanol as ball-milling medium, A and B
Ratio of grinding media to material be 10:1, in mechanical milling process add forming agent, the rotating speed of ball mill is at 90-100r/min；
Step 3, sieves and is dried: sieved by the powder of step 2 milled, places in vacuum drying oven and is dried,
Then compressing on tablet machine, it is finally putting in sintering furnace；
Step 4, low pressure sintering: sintering temperature is controlled at 1400 DEG C, it is incubated 30min, i.e. prepares this mill guide wheel.
When sintering temperature 1400 DEG C, the tissue relative density of this mill guide wheel is 96.3%, the further increase of temperature,
Causing density to reduce, hardness reduces.
In the description of this specification, the description of reference term " embodiment ", " example ", " concrete example " etc. means
Specific features, structure, material or feature in conjunction with this embodiment or example description is contained at least one enforcement of the present invention
In example or example.In this manual, the schematic representation to above-mentioned term is not necessarily referring to identical embodiment or example.
And, the specific features of description, structure, material or feature can be to close in any one or more embodiments or example
Suitable mode combines.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.Preferred embodiment is the most detailed
Describe all of details, be also not intended to the detailed description of the invention that this invention is only described.Obviously, according to the content of this specification,
Can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is to preferably explain the present invention
Principle and actual application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only
Limited by claims and four corner thereof and equivalent.
Claims (1)
1. a method based on WC-10Co hard alloy low pressure sintering molding mill guide wheel, it is characterised in that include walking as follows
Rapid:
Step one, the WC powder of dispensing: 60%-75%, 6%-7.5%Co powder and 0.6%-0.75% grain inhibitor
The preparation of A ultra-fine WC powder: graphite powder and tungsten powder are placed in ball mill in the ratio of atomic ratio 1:1, at hydrogen shield
Lower ball milling 50h-150h, has synthesized the WC powder body that grain size is 7.0-7.5 circle；
The preparation of B Co powder: Co powder is placed in ball mill, ball milling 30h-50h under hydrogen shield, form the Co of 0.7-0.9 μm
Powder；
C grain inhibitor: include the Gr of VC and 25%-40% of 60%-75%5C3；
Step 2, wet grinding: dispensing step one prepared joins in tank, with liquid ethanol as ball-milling medium, the ball of A and B
Material ratio is 10:1, adds forming agent in mechanical milling process, and the rotating speed of ball mill is at 90-100r/min；
Step 3, sieves and is dried: sieved by the powder of step 2 milled, places in vacuum drying oven and is dried, then
On tablet machine compressing, be finally putting in sintering furnace；
Step 4, low pressure sintering: sintering temperature is controlled the scope at 1280 DEG C-1400 DEG C, it is incubated 25-35min, i.e. preparing should
Mill guide wheel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610693728.6A CN106041092A (en) | 2016-08-19 | 2016-08-19 | Method for low-pressure sintering formation of guide wheel of guide fitting based on WC-10Co cemented carbide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610693728.6A CN106041092A (en) | 2016-08-19 | 2016-08-19 | Method for low-pressure sintering formation of guide wheel of guide fitting based on WC-10Co cemented carbide |
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| CN106041092A true CN106041092A (en) | 2016-10-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001329331A (en) * | 2000-05-19 | 2001-11-27 | Hitachi Tool Engineering Ltd | High hardness and high toughness cemented carbide and its production method |
| CN103635599A (en) * | 2011-06-27 | 2014-03-12 | 京瓷株式会社 | Hard alloy and cutting tool |
| CN103627942A (en) * | 2013-03-20 | 2014-03-12 | 厦门钨业股份有限公司 | Preparation method for high-performance WC-Co nanocrystal cemented carbide |
| CN105264103A (en) * | 2013-05-31 | 2016-01-20 | 山特维克知识产权股份有限公司 | New process of manufacturing cemented carbide and a product obtained thereof |
-
2016
- 2016-08-19 CN CN201610693728.6A patent/CN106041092A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001329331A (en) * | 2000-05-19 | 2001-11-27 | Hitachi Tool Engineering Ltd | High hardness and high toughness cemented carbide and its production method |
| CN103635599A (en) * | 2011-06-27 | 2014-03-12 | 京瓷株式会社 | Hard alloy and cutting tool |
| CN103627942A (en) * | 2013-03-20 | 2014-03-12 | 厦门钨业股份有限公司 | Preparation method for high-performance WC-Co nanocrystal cemented carbide |
| CN105264103A (en) * | 2013-05-31 | 2016-01-20 | 山特维克知识产权股份有限公司 | New process of manufacturing cemented carbide and a product obtained thereof |
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Application publication date: 20161026 |