CN111763864A - Method for controlling grain size of WC-Co hard alloy reclaimed material - Google Patents
Method for controlling grain size of WC-Co hard alloy reclaimed material Download PDFInfo
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- CN111763864A CN111763864A CN202010661283.XA CN202010661283A CN111763864A CN 111763864 A CN111763864 A CN 111763864A CN 202010661283 A CN202010661283 A CN 202010661283A CN 111763864 A CN111763864 A CN 111763864A
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- hard alloy
- ball milling
- grain size
- reclaimed material
- sintering
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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
Abstract
The application provides a method for controlling the grain size of a WC-Co hard alloy reclaimed material, which comprises the following steps in sequence: zinc melting, dry ball milling, screening, wet ball milling, mixture preparation, granulation, compression molding and sintering; by adopting 1390-1400 ℃ lower than the conventional sintering temperature to perform low-temperature sintering successively twice, the grain size of the hard alloy reclaimed material prepared by the method is uniformly controlled to be close to a certain numerical value of 1.2-1.6 mu m, the upper and lower limit ranges of the grain size are obviously smaller than 1.2-1.6 mu m, the stability and uniformity of various performances of the hard alloy reclaimed material prepared by the method are obviously improved, and the purpose of preparing WC-Co hard alloy reclaimed material with more uniform grain size by recycling waste hard alloy is realized.
Description
Technical Field
The invention relates to the technical field of waste hard alloy recovery and regeneration, in particular to a method for controlling the grain size of a WC-Co hard alloy reclaimed material.
Background
The hard alloy has a plurality of excellent mechanical properties such as high strength, high hardness, high wear resistance, thermal shock resistance and the like, is widely applied to the fields of mining, oil field exploration, mechanical processing and the like, and is known as 'industrial teeth'. It is known that the reserves of tungsten and cobalt, the main raw materials for preparing cemented carbide, are very small and the dispersion is very uneven, and the two raw materials become increasingly scarce after years of industrial consumption. Therefore, the recycling of the waste hard alloy is more and more important, and the preparation of the hard alloy reclaimed material by the waste hard alloy can solve the problem of shortage of rare tungsten resources and cobalt resources and has important significance for developing circular economy and fully utilizing natural economy.
In the recovery process of the waste hard alloy, the waste hard alloy with different brands and different categories such as WC-Co, WC-Co-Ti and other steel bonded alloy is mixed, and then great difficulty is brought to the production and manufacture of the subsequent hard alloy reclaimed material. Even if the waste hard alloy is WC-Co waste hard alloy, the grain size of the waste hard alloy is different due to factors such as different manufacturers producing and different batches, and further the grain size of the hard alloy reclaimed material is uneven, so that the performance of the hard alloy reclaimed material is unstable.
Therefore, the grain size of the WC-Co hard alloy reclaimed material is controlled to be uniform, and the method has very important significance for stabilizing the performance of the hard alloy reclaimed material.
Disclosure of Invention
The embodiment of the invention aims to provide a method for controlling the grain size of a WC-Co hard alloy reclaimed material.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for controlling the grain size of a WC-Co hard alloy reclaimed material comprises the following steps in sequence:
1) zinc melting: carrying out zinc melting treatment on the waste hard alloy;
2) dry ball milling: carrying out dry ball milling treatment on the product obtained after the zinc melting treatment in the step 1);
3) screening: screening the powder obtained after the dry ball milling treatment in the step 2) by using a 170-190 mesh screen, and taking undersize;
4) wet ball milling: carrying out wet ball milling treatment on the undersize obtained by screening in the step 3);
5) preparing a mixture: adding a forming agent into the powder obtained after the wet ball milling in the step 4), and then drying and screening the powder in sequence to obtain undersize, namely a mixture;
6) and (3) granulating: granulating the mixture obtained in the step 5) to obtain granules;
7) and (3) pressing and forming: pressing the granulated material prepared in the step 6) into a target required shape;
8) and (3) sintering: sintering the product obtained after the press forming in the step 7), wherein the primary sintering temperature is 1390-1400 ℃, furnace cooling is carried out after the primary sintering heat preservation process is finished, the temperature is increased to 1390-1400 ℃ again after the primary sintering heat preservation process is finished, secondary sintering is carried out, and the WC-Co hard alloy reclaimed material is obtained after the secondary sintering is finished.
Preferably, in the step 1), the waste hard alloy comprises the following components in percentage by mass: 5-10 wt% of cobalt and the balance of tungsten carbide; the grain size of the tungsten carbide is 1.2-1.6 μm.
Preferably, in the step 2), in the dry ball milling, the ball-material ratio is 2:1, the diameter of the grinding ball is 6 mm-10 mm, and the dry ball milling time is 2.5 hours-3 hours.
Preferably, in the step 3), the powder obtained after the dry ball milling treatment in the step 3) is screened by using a 180-mesh screen.
Preferably, in the step 4), the wet ball milling time is 48 hours, and after the wet ball milling is finished, the discharging and filtering are performed by selecting a 1500-mesh stainless steel filter screen for filtering so as to ensure that no coarse particles exist in the slurry.
Preferably, in the step 5), the forming agent is polyethylene glycol (PEG) or paraffin, the adding amount of the forming agent is 2 wt%, and the screen is 350 meshes.
The application provides a method for controlling the grain size of a WC-Co hard alloy reclaimed material, which comprises the following steps in sequence: zinc melting, dry ball milling, screening, wet ball milling, mixture preparation, granulation, compression molding and sintering;
by adopting 1390-1400 ℃ lower than the conventional sintering temperature to perform low-temperature sintering successively twice, the grain size of the hard alloy reclaimed material prepared by the method is uniformly controlled to be close to a certain numerical value of 1.2-1.6 microns, although the grain size in the method still has upper and lower limits, the upper and lower limits of the grain size in the method are obviously smaller than 1.2-1.6 microns, the stability and uniformity of various properties of the hard alloy reclaimed material prepared by the method are obviously improved, and the WC-Co hard alloy reclaimed material with more uniform grain size is prepared by utilizing recovered waste hard alloy.
Drawings
FIG. 1 is an SEM image of a WC-Co cemented carbide reclaimed material (brand No. reclaimed YG6) prepared in example 1 of the invention;
fig. 2 is an SEM image of the virgin cemented carbide (grade virgin YG6) in comparative example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The application provides a method for controlling the grain size of a WC-Co hard alloy reclaimed material, which comprises the following steps in sequence:
1) zinc melting: carrying out zinc melting treatment on the waste hard alloy;
2) dry ball milling: carrying out dry ball milling treatment on the product obtained after the zinc melting treatment in the step 1);
3) screening: screening the powder obtained after the dry ball milling treatment in the step 2) by using a 170-190 mesh screen, and taking undersize;
4) wet ball milling: carrying out wet ball milling treatment on the undersize obtained by screening in the step 3);
5) preparing a mixture: adding a forming agent into the powder obtained after the wet ball milling in the step 4), and then drying and screening the powder in sequence to obtain undersize, namely a mixture;
6) and (3) granulating: granulating the mixture obtained in the step 5) to obtain granules;
7) and (3) pressing and forming: pressing the granulated material prepared in the step 6) into a target required shape;
8) and (3) sintering: sintering the product obtained after the press forming in the step 7), wherein the primary sintering temperature is 1390-1400 ℃, furnace cooling is carried out after the primary sintering heat preservation process is finished, the temperature is increased to 1390-1400 ℃ again after the primary sintering heat preservation process is finished, secondary sintering is carried out, and the WC-Co hard alloy reclaimed material is obtained after the secondary sintering is finished.
In one embodiment of the application, in step 1), the waste hard alloy comprises the following components in percentage by mass: 5-10 wt% of cobalt and the balance of tungsten carbide; the grain size of the tungsten carbide is 1.2-1.6 μm.
In one embodiment of the present application, in the step 2), in the dry ball milling, the ball-to-material ratio is 2:1, the diameter of the grinding balls is 6mm to 10mm, and the dry ball milling time is 2.5 hours to 3 hours.
In one embodiment of the present application, in step 3), the powder obtained after the dry ball milling process of step 3) is sieved by using a 180-mesh sieve.
In one embodiment of the present application, in step 4), the wet ball milling time is 48 hours, and after the wet ball milling is completed, the discharge filtering is performed by using a 1500-mesh stainless steel filter screen for filtering, so as to ensure that no coarse particles are in the slurry.
In one embodiment of the present application, in step 5), the forming agent is polyethylene glycol PEG or paraffin, the addition amount of the forming agent is 2 wt%, and the mesh is 350 mesh.
In the application, in the step 8), the primary sintering temperature is 1390-1400 ℃, the furnace cooling is performed after the primary sintering heat preservation process is finished, the temperature is increased to 1390-1400 ℃ again after the primary sintering heat preservation process is finished, the secondary sintering is performed after the primary sintering temperature is 950-1050 ℃, the low-temperature sintering is performed at 1390-1400 ℃ lower than the conventional sintering temperature and the primary and secondary low-temperature sintering is performed twice, the growth speed and the growth process of crystal grains are controlled, the crystal grains grow synchronously, the size of the crystal grains is more uniform, the grain size of the hard alloy reclaimed material prepared by the application is uniformly controlled to be close to one value of 1.2-1.6 μm, although the grain size in the application still has upper and lower limits, the upper and lower limit range of the grain size in the application is obviously smaller than 1.2-1.6 μm, for example, the upper and lower limit range of the grain size in the application is 1.5-1.6 μm.
In the application, in the step 2) of dry ball milling, the zinc-melted part on the surface layer is ensured to be crushed into powder, and the non-melted part in the alloy is not mechanically crushed into powder.
In the application, in the screening in the step 3), oversize materials are returned to the step 1), and the zinc melting treatment and the dry ball milling treatment are sequentially carried out again.
For further understanding of the present invention, the following will describe the method for controlling the grain size of the reclaimed material of WC — Co cemented carbide provided by the present invention in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
A method for controlling the grain size of a WC-Co hard alloy reclaimed material to prepare a reclaimed YG6 hard alloy comprises the following steps in sequence:
1) zinc melting: carrying out zinc melting treatment on the waste hard alloy;
in the step 1), the waste hard alloy comprises the following components in percentage by mass: 6 wt% cobalt, balance tungsten carbide; the grain size of the tungsten carbide is 1.2-1.6 mu m;
2) dry ball milling: carrying out dry ball milling treatment on the product obtained after the zinc melting treatment in the step 1);
in the step 2), in the dry ball milling, the ball-material ratio is 2:1, the diameter of the grinding ball is 6 mm-10 mm, and the dry ball milling time is 3 hours;
3) screening: screening the powder obtained after the dry ball milling treatment in the step 2) by using a 180-mesh screen, and taking undersize;
4) wet ball milling: carrying out wet ball milling treatment on the undersize obtained by screening in the step 3);
in the step 4), the wet ball milling time is 48 hours, and after the wet ball milling is finished, unloading and filtering are carried out, and a 1500-mesh stainless steel filter screen is selected for filtering so as to ensure that coarse particles do not exist in the slurry;
5) preparing a mixture: adding a forming agent into the powder obtained after the wet ball milling in the step 4), and then drying and screening the powder in sequence to obtain undersize, namely a mixture;
in the step 5), the forming agent is paraffin, the addition amount of the forming agent is 2 wt%, and the screen is 350 meshes;
6) and (3) granulating: granulating the mixture obtained in the step 5) to obtain granules;
7) and (3) pressing and forming: pressing the granulated material prepared in the step 6) into a target required shape;
8) and (3) sintering: sintering the product obtained after the press forming in the step 7), wherein the primary sintering temperature is 1395 ℃, furnace cooling is carried out after the primary sintering heat preservation process is finished, the temperature is raised to 1395 ℃ again after the primary sintering heat preservation process is finished, secondary sintering is carried out, and the WC-Co hard alloy reclaimed material is obtained after the secondary sintering is finished.
The performance data of the WC-Co hard alloy reclaimed material prepared in the example 1 are shown in the table 1.
TABLE 1 Performance data for the WC-Co cemented carbide regrind prepared in example 1 and comparative example 1
Methods and devices not described in detail in the present invention are all the prior art and are not described in detail.
The principles and embodiments of the present invention are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. A method for controlling the grain size of a WC-Co hard alloy reclaimed material is characterized by comprising the following steps of:
1) zinc melting: carrying out zinc melting treatment on the waste hard alloy;
2) dry ball milling: carrying out dry ball milling treatment on the product obtained after the zinc melting treatment in the step 1);
3) screening: screening the powder obtained after the dry ball milling treatment in the step 2) by using a 170-190 mesh screen, and taking undersize;
4) wet ball milling: carrying out wet ball milling treatment on the undersize obtained by screening in the step 3);
5) preparing a mixture: adding a forming agent into the powder obtained after the wet ball milling in the step 4), and then drying and screening the powder in sequence to obtain undersize, namely a mixture;
6) and (3) granulating: granulating the mixture obtained in the step 5) to obtain granules;
7) and (3) pressing and forming: pressing the granulated material prepared in the step 6) into a target required shape;
8) and (3) sintering: sintering the product obtained after the press forming in the step 7), wherein the primary sintering temperature is 1390-1400 ℃, furnace cooling is carried out after the primary sintering heat preservation process is finished, the temperature is increased to 1390-1400 ℃ again after the primary sintering heat preservation process is finished, secondary sintering is carried out, and the WC-Co hard alloy reclaimed material is obtained after the secondary sintering is finished.
2. The method for controlling the grain size of the WC-Co hard alloy reclaimed material according to claim 1, wherein in the step 1), the waste hard alloy comprises the following components in percentage by mass: 5-10 wt% of cobalt and the balance of tungsten carbide; the grain size of the tungsten carbide is 1.2-1.6 μm.
3. The method for controlling the grain size of the WC-Co hard alloy reclaimed material as recited in claim 1, wherein in the step 2), the ball-to-material ratio is 2:1, the diameter of the grinding ball is 6 mm-10 mm, and the dry ball milling time is 2.5 h-3 h.
4. The method for controlling the grain size of the WC-Co hard alloy reclaimed material as recited in claim 1, wherein in the step 3), the powder obtained after the dry ball milling treatment in the step 3) is sieved by using a 180-mesh screen.
5. The method for controlling the grain size of the WC-Co hard alloy reclaimed material as recited in claim 1, wherein in the step 4), the wet ball milling time is 48 hours, and after the wet ball milling is finished, 1500-mesh stainless steel filter screens are selected for filtering, so as to ensure that coarse particles are not contained in the slurry.
6. The method for controlling the grain size of the WC-Co hard alloy reclaimed material according to claim 1, wherein in the step 5), the forming agent is polyethylene glycol (PEG) or paraffin wax, the addition amount of the forming agent is 2 wt%, and the screen mesh is 350 meshes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010661283.XA CN111763864A (en) | 2020-07-10 | 2020-07-10 | Method for controlling grain size of WC-Co hard alloy reclaimed material |
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| CN202010661283.XA CN111763864A (en) | 2020-07-10 | 2020-07-10 | Method for controlling grain size of WC-Co hard alloy reclaimed material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115896520A (en) * | 2022-12-29 | 2023-04-04 | 株洲长江硬质合金工具有限公司 | Method for preparing hard alloy round bar by using hard alloy waste |
| CN116103555A (en) * | 2023-01-13 | 2023-05-12 | 福建中成新材料科技有限公司 | Regenerated hard alloy extruded round bar material and preparation process thereof |
-
2020
- 2020-07-10 CN CN202010661283.XA patent/CN111763864A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115896520A (en) * | 2022-12-29 | 2023-04-04 | 株洲长江硬质合金工具有限公司 | Method for preparing hard alloy round bar by using hard alloy waste |
| CN116103555A (en) * | 2023-01-13 | 2023-05-12 | 福建中成新材料科技有限公司 | Regenerated hard alloy extruded round bar material and preparation process thereof |
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Application publication date: 20201013 |