CN110541102A - coating gradient hard alloy cutter directly coated with CBN coating and preparation method thereof - Google Patents
coating gradient hard alloy cutter directly coated with CBN coating and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
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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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- 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
- C22C29/005—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides comprising a particular metallic binder
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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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- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/34—Nitrides
- C23C16/342—Boron nitride
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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
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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Abstract
The invention relates to the technical field of hard alloy cutters, in particular to a coating gradient hard alloy cutter directly coated with a CBN coating and a preparation method thereof. According to the invention, the alloy bonding phase is adopted to form composite powder with TiC, TaC and WC according to a certain ratio, and the blank is sintered according to the sintering atmosphere, so that the cutter substrate which sequentially comprises a normal tissue layer, a transition layer and a surface layer from inside to outside can be prepared, and the thickness of the surface layer is 50-400 mu m, therefore, a CBN coating can be directly prepared on the cutter substrate, and a coating transition layer and a bonding layer do not need to be prepared between the CBN coating and the cutter substrate.
Description
Technical Field
The invention relates to the technical field of hard alloy cutters, in particular to a coating gradient hard alloy cutter directly coated with a CBN coating and a preparation method thereof.
background
The appearance of coated cemented carbide tools is an important milestone in the tool development history, and is formed by coating a thin layer of a refractory metal or non-metallic compound with good wear resistance on a cemented carbide substrate with good strength and toughness by a vapor deposition method. The coating acts as a chemical and thermal barrier, reducing diffusion and chemical reactions between the tool and the workpiece, thereby reducing crater wear. The coating has a high hardness and heat resistance and reduces the coefficient of friction between the tool and the workpiece, so that the coated tool has a significantly improved service life compared to a non-coated tool, typically a 2-5 times longer service life than a non-coated tool.
In order to improve the wear resistance of cemented carbide tools, different coatings have been prepared by vapour deposition methods, whereby hard material coatings with higher wear resistance, such as TiC, TiN, TiCN and Al2O3, are applied on the surface, which coatings typically have a hardness of 15-40 Gpa.
Cubic Boron Nitride (CBN) is the second superhard material next to diamond, has excellent physical and chemical properties, is next to diamond in hardness and thermal conductivity, has thermal stability obviously superior to diamond, is oxidized when being heated to 1200 ℃ in the atmosphere, has the oxidation temperature of 600 ℃ in the atmosphere, has extremely stable chemical properties for black metal, can be widely applied to cutting processing of steel products, can completely serve as cutting processing of hard steel, bearing steel, high-speed steel, tool steel, chilled cast iron, high-temperature alloy, thermal spraying material and other difficult-to-process materials, is one of the best cutting tools for realizing 'cutting grinding' at present, and is considered as one of the cutting tool materials with development prospects in the 21 st century. Patent document CN201810033987.5 discloses a method for preparing GNCD-cBN nanocomposite multilayer coated tool with toughening mechanism, comprising the following steps: 1) preprocessing a substrate; 2) chemical vapor deposition of a gradient nanodiamond coating; 3) carrying out surface pretreatment again on the substrate with the gradient nano-diamond transition layer deposited on the surface; 4) depositing a cubic boron nitride coating; 5) and (3) repeating the steps 2-4 to deposit the GNCD/cBN nano multi-layer coating cutter on the surface of the hard alloy blade. The technology forms a composite coating by alternately growing gradient nano-diamond (GNCD) and cubic boron nitride (cBN), so that the coating of the cutter has the hardness of the cubic boron nitride coating and is used for cutting ferrous metal materials such as high-temperature alloy, high-strength steel and the like, and meanwhile, the thickness of the coating can be increased by using the gradient nano-diamond, the toughness of the coating in the cutting process is changed, and the strength and the impact resistance of the coating are integrally improved.
However, since the critical problems such as film stress and film-substrate bonding force cannot be solved, the application of CBN films in cemented carbide cutting tools is limited. Patent CN201610083497.7 discloses a boron nitride-based composite coating, which comprises a TiBCN layer as a transition layer deposited on the surface of a tool substrate, a Ni3Si2 layer as a bonding layer deposited on the transition layer, and a CBN coating as a wear-resistant layer deposited on the bonding layer, which are sequentially distributed from inside to outside. The boron nitride series composite coating can be well combined with a base body through the TiBCN layer, and then a real functional layer CBN coating can be formed outside the cutter base body through the Ni3Si2 layer. The prior art still does not well solve the problem of direct bonding of the CBN coating and the cutter substrate.
Disclosure of Invention
The invention provides a coating gradient hard alloy cutter directly coated with a CBN coating, aiming at the problem that the prior coating hard alloy cutter is difficult to realize that the CBN coating is directly coated on a cutter substrate, the cutter substrate and the CBN coating have good bonding property, and the cutter has good wear-resisting and temperature-resisting properties, high strength and excellent shock resistance; and a preparation method of the coating gradient hard alloy cutter.
In order to achieve the purpose, the invention adopts the following technical scheme.
In one aspect of the invention, a coating gradient hard alloy cutter directly coated with a CBN coating is provided, which consists of a cutter substrate and the CBN coating arranged on the cutter substrate; the cutter base body comprises a normal tissue layer, a transition layer and a surface layer which are sequentially arranged from inside to outside; the thickness of the surface layer is 50-400 μm;
The cutter base body is formed by sintering composite powder consisting of the following components in percentage by mass: 5-15% of TiC, 2-5% of TaC, 10-15% of alloy binding phase and the balance of WC;
The alloy binding phase consists of the following powder in percentage by mass: 0.5-5.5% of Cr, 0.5-5.5% of Mo, 0.5-5.5% of B, 0.5-5.5% of Al, 0.5-5.5% of V, 0.5-5.5% of Y, 0.5-5.5% of Si, and the balance of Ni or mixed powder of Co and Ni, wherein the sum of the mass of Cr, Mo, B, Al, V, Y and Si in the alloy binder phase is 7-20% of the mass of the alloy binder phase.
Preferably, the thickness of the normal tissue layer is more than 2mm, and the thickness of the transition layer is 20-100 μm; the thickness of the surface layer is 50-400 μm.
Preferably, the thickness of the CBN coating is 1-2 μm.
In another aspect of the present invention, there is provided a method for preparing the above-mentioned gradient coated cemented carbide tool directly coated with CBN coating, comprising the steps of:
S1 preparing an alloy binding phase: and weighing each powder forming the alloy binder phase according to the mass percent, and uniformly mixing the powder to obtain the alloy binder phase.
Preferably, in step S1, each powder constituting the alloy binder phase is placed in a ball mill, and ball milling is performed for 72 hours by using cemented carbide grinding balls, and ball milling is suspended for 10 minutes every 1 hour of ball milling, so as to obtain the alloy binder phase.
S2 preparing a billet: weighing each component for forming the composite powder according to the mass percent, weighing paraffin according to 1.5-2.5% of the mass of the composite powder, and uniformly mixing the paraffin and the raw material powder to obtain a blank.
s3 green compact: and pressing and forming the blank to obtain a blank.
Preferably, in step S3, the blank is first pressed and molded by a molding press to obtain a primary blank; and further pressing the primary blank by using a cold isostatic press to obtain a blank.
s4 sintering: placing the blank in a sintering furnace, heating to 1200-1250 ℃ at the speed of 5-8 ℃/min, preserving the heat for 18-22min, and keeping the vacuum degree below 1 x 10 < -3 > Pa; then nitrogen is filled into the sintering furnace, the temperature is raised to 1420-1450 ℃ at the speed of 1-3 ℃/min, the temperature is kept for 55-65min, and the pressure is kept above 0.2 MPa; then, the temperature is reduced to 1200 ℃ at the speed of 2-6 ℃/min, the temperature is maintained for 110-; and then cooling the blank along with the furnace, and keeping the pressure above 0.2MPa to obtain the cutter matrix.
preferably, before step S4, a pre-sintering step is further included, in which the green body is placed in a sintering furnace and sintered at 1400 ℃ for 10min under an inert gas atmosphere; and (5) cooling the blank along with the furnace, and then finely trimming the appearance of the blank.
S5 depositing CBN coating: and depositing CBN on the surface layer of the cutter base body by adopting a CVD method to form a CBN coating.
Preferably, in step S5, the process parameters for depositing the CBN coating are: the flow rates of BF3, N2, Ar and H2 were 20sccm, 2slm, 4slm and 5sccm, respectively, the total reaction gas pressure was 4kPa, the substrate negative bias was 65V, the substrate temperature was 860 ℃ and the deposition time was 60 min.
Compared with the prior art, the invention has the beneficial effects that:
According to the invention, the alloy bonding phase is adopted to form composite powder with TiC, TaC and WC according to a certain ratio, and the blank is sintered according to the sintering atmosphere, so that the cutter substrate which sequentially comprises a normal tissue layer, a transition layer and a surface layer from inside to outside can be prepared, and the thickness of the surface layer is 50-400 mu m, therefore, a CBN coating can be directly prepared on the cutter substrate, and a coating transition layer and a bonding layer do not need to be prepared between the CBN coating and the cutter substrate.
Drawings
FIG. 1 is a light mirror image of the tool substrate prepared in examples 12 and 13 and 14 and 15.
Detailed Description
In order to more fully understand the technical contents of the present invention, the technical solutions of the present invention will be further described and illustrated with reference to the following specific embodiments.
The features, benefits and advantages of the present invention will become apparent to those skilled in the art from a reading of the present disclosure.
Examples 1 to 22
examples 1-22 provide an alloy binder phase, and a coated gradient cemented carbide tool with a CBN coating applied directly thereto, respectively. The mass percentages of the powders constituting the binder phase of the alloys of examples 1 to 22 are shown in table 1 below. In examples 1 to 22, the alloy binder phase and TiC, TaC, and WC constitute a composite powder for sintering a tool substrate, and the composite powder comprises the following components in percentage by mass: 14% of alloy binder phase, 10% of TiC, 5% of TaC and 71% of WC.
TABLE 1 mass percent (wt%) of each powder constituting the binder phase of the alloy
The method of making the coated gradient cemented carbide tool of examples 1-22 with a CBN coating applied directly thereto, comprising the steps of:
S1 preparing an alloy binding phase: weighing each powder forming the alloy binder phase according to the mass percent, placing each powder forming the alloy binder phase in a ball mill, carrying out ball milling for 72h by using a hard alloy grinding ball, and suspending ball milling for 10min every 1h to obtain the alloy binder phase.
S2 preparing a billet: weighing each component for forming the composite powder according to the mass percent, weighing paraffin according to 1.5-2.5% of the mass of the composite powder, and uniformly mixing the paraffin and the raw material powder to obtain a blank.
In other embodiments, the dosage of the paraffin as the forming agent can also be in the range of 1.5-2.5% of the total mass of the composite powder, and the structure and the performance of the gradient hard alloy formed by sintering are not influenced, namely the structure and the performance of the cutter base body formed by sintering are not influenced.
S3 green compact: putting the blank into an automatic molding press to be molded by dry pressing at 30MPa to obtain a primary blank body; and further pressing the primary blank by using a cold isostatic press, wherein the pressure is 200MPa, and the time is 5min, so that the blank for sintering to form the cutter base body is obtained.
s4 pre-sintering and sintering:
Pre-sintering: placing the blank body in a sintering furnace, and sintering for 10min at 1400 ℃ in an inert gas atmosphere; and (5) cooling the blank along with the furnace, and then finely trimming the appearance of the blank.
And (3) sintering: placing the blank in a sintering furnace, heating to 1200-1250 ℃ at the speed of 5-8 ℃/min, preserving the heat for 18-22min, and keeping the vacuum degree below 1 x 10 < -3 > Pa; then nitrogen is filled into the sintering furnace, the temperature is raised to 1420-1450 ℃ at the speed of 1-3 ℃/min, the temperature is kept for 55-65min, and the pressure is kept above 0.2 MPa; then, the temperature is reduced to 1200 ℃ at the speed of 2-6 ℃/min, the temperature is maintained for 110-; and then cooling the blank along with the furnace, and keeping the pressure above 0.2MPa to obtain the cutter matrix.
S5 depositing CBN coating: and depositing CBN on the surface layer of the cutter base body by adopting a CVD method to form a CBN coating. The technological parameters for depositing the CBN coating are as follows: the flow rates of BF3, N2, Ar and H2 were 20sccm, 2slm, 4slm and 5sccm, respectively, the total reaction gas pressure was 4kPa, the substrate negative bias was 65V, the substrate temperature was 860 ℃ and the deposition time was 60 min.
Examples 23 to 28
Examples 23-28 each provide a coated gradient cemented carbide tool coated directly with a CBN coating. The composite powder for sintering and manufacturing the cutter base body consists of an alloy binder phase and TiC, TaC and WC, and the mass percentage of each powder forming the alloy binder phase is (the same as that of the embodiment 15): 1.5% of Cr, 1.5% of Mo, 5.5% of B, 0.5% of Al, 5.5% of V, 3.5% of Y, 2.0% of Si, 70% of Ni and 10% of Co. The mass percentages of the alloy binder phase and TiC, TaC and WC in the composite powder are shown in Table 2 below.
TABLE 2 quality percentages (wt%) of the components in the composite powders of examples 23-28
The coated gradient cemented carbide inserts of examples 23-28, which were directly coated with CBN coating, were prepared in the same manner as in example 15.
The wear resistance and the bonding strength of the coating and the substrate of the coating gradient hard alloy cutter directly coated with the CBN coating prepared in the above embodiment are respectively tested. The bonding strength of the coating and the substrate is measured by a nanometer scratch tester (CSM Revetest test, SwitzReland), and the critical load Lc when the coating is damaged is used as a standard for measuring the bonding force of the coating and the substrate. The experimental parameters were: indenter radius 200 μm, loading force 100N, scratch rate 6mm/min, scratch length 3 mm. Abrasion resistance was tested according to ASTM B611. The test results are shown in table 3 below.
table 3 results of various tests on coated gradient cemented carbide inserts prepared in examples
In fig. 1, a, b, c and d are optical mirror images of the tool matrixes prepared in examples 12 and 13 and 14 and 15, respectively, and it can be seen that the thickness of the surface layer of the tool matrix increases with the content of the Ni element in the alloy binder phase, and when the content of the Ni element in the alloy binder phase increases, the solubility of the Ti element in the liquid phase binder phase can be improved in the heat preservation stage of nitriding sintering, and further, the diffusion of the Ti atoms from the inside to the outer surface of the alloy through the liquid phase binder phase is promoted, so as to promote the generation of the cermet surface layer.
The technical contents of the present invention are further illustrated by the examples, so as to facilitate the understanding of the reader, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation based on the present invention is protected by the present invention.
Claims (8)
1. A coating gradient hard alloy cutter directly coated with a CBN coating is characterized by consisting of a cutter substrate and the CBN coating arranged on the cutter substrate; the cutter base body comprises a normal tissue layer, a transition layer and a surface layer which are sequentially arranged from inside to outside; the thickness of the surface layer is 50-400 μm;
The cutter base body is formed by sintering composite powder consisting of the following components in percentage by mass: 5-15% of TiC, 2-5% of TaC, 10-15% of alloy binding phase and the balance of WC;
The alloy binding phase consists of the following powder in percentage by mass: 0.5-5.5% of Cr, 0.5-5.5% of Mo, 0.5-5.5% of B, 0.5-5.5% of Al, 0.5-5.5% of V, 0.5-5.5% of Y, 0.5-5.5% of Si, and the balance of Ni or mixed powder of Co and Ni, wherein the sum of the mass of Cr, Mo, B, Al, V, Y and Si in the alloy binder phase is 7-20% of the mass of the alloy binder phase.
2. The coated gradient cemented carbide tool with a CBN coating directly applied as claimed in claim 1, wherein the thickness of the normal tissue layer is more than 2mm and the thickness of the transition layer is 20-100 μ ι η; the thickness of the surface layer is 50-400 μm.
3. The coated gradient cemented carbide tool of claim 1 where the CBN coating is directly applied, wherein the CBN coating has a thickness of 1-2 μm.
4. A method of making a coated gradient cemented carbide tool with a CBN coating applied directly thereto as claimed in claim 1, comprising the steps of:
S1 preparing an alloy binding phase: weighing each powder forming the alloy binder phase according to the mass percent, and uniformly mixing the powder to obtain the alloy binder phase;
S2 preparing a billet: weighing each component for forming the composite powder according to the mass percent, weighing paraffin according to 1.5-2.5% of the mass of the composite powder, and uniformly mixing the paraffin and the raw material powder to obtain a blank;
S3 green compact: pressing and forming the blank to obtain a blank body;
S4 sintering: placing the blank in a sintering furnace, heating to 1200-1250 ℃ at the speed of 5-8 ℃/min, preserving the heat for 18-22min, and keeping the vacuum degree below 10-3 Pa; then nitrogen is filled into the sintering furnace, the temperature is raised to 1420-1450 ℃ at the speed of 1-3 ℃/min, the temperature is kept for 55-65min, and the pressure is kept above 0.2 MPa; then, the temperature is reduced to 1200 ℃ at the speed of 2-6 ℃/min, the temperature is maintained for 110-; then cooling the blank along with the furnace, and keeping the pressure above 0.2MPa to prepare a cutter substrate;
s5 depositing CBN coating: and depositing CBN on the surface layer of the cutter base body by adopting a CVD method to form a CBN coating.
5. the method for preparing a coating gradient cemented carbide tool directly coated with a CBN coating according to claim 4, characterized by further comprising a pre-sintering step before step S4, wherein the pre-sintering step is to place the blank in a sintering furnace and sinter the blank at 1400 ℃ for 10min under an inert gas atmosphere; and (5) cooling the blank along with the furnace, and then finely trimming the appearance of the blank.
6. The method for preparing a coating gradient cemented carbide tool directly coated with a CBN coating as claimed in claim 4, wherein in step S5, the process parameters for depositing the CBN coating are: the flow rates of BF3, N2, Ar and H2 were 20sccm, 2slm, 4slm and 5sccm, respectively, the total reaction gas pressure was 4kPa, the substrate negative bias was 65V, the substrate temperature was 860 ℃ and the deposition time was 60 min.
7. The method for preparing a coated gradient cemented carbide tool insert directly coated with a CBN coating as claimed in claim 4, wherein in step S3, the blank is first press-formed by a press molding machine to obtain a primary blank; and further pressing the primary blank by using a cold isostatic press to obtain a blank.
8. The method for preparing a coated gradient cemented carbide tool directly coated with a CBN coating as claimed in claim 4, wherein in step S1, each powder constituting the alloy binder phase is placed in a ball mill, ball milling is performed with cemented carbide milling balls for 72h, and ball milling is suspended for 10min every 1h to obtain the alloy binder phase.
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