Cermet, method for producing the same, and cutting tool

Abstract

The application discloses a cermet and a preparation method and a cutter thereof, wherein the cermet comprises the following components in percentage by weight: TiC: 25-45%; TiN: 9.5-10%; Ni: 25-32%; Mo: 0-12%; and WC: 5-25%. The application takes TiC, TiN hard phases and a Ni binder phase as main raw materials, and adds nano WC thereto. Since WC is a good conductor of electricity, and after the nano WC is solid-solved in the metal binder phase, the outer electrons of W are transferred into the empty orbit of nickel, and the magnetic exchange effect of Ni in the binder phase is weakened. The prepared conductive cermet has a magnetic susceptibility as low as 1.36*10 ‑5 .

Description

Technical Field

[0001] The present invention relates to the field of material technology, and in particular to a metal ceramic, a preparation method thereof, and a cutting tool. Background Art

[0002] Ti(C,N)-based cermets, as hard composite materials, have been widely used in cutting and wear-resistant applications due to their high hardness, excellent wear resistance, low friction coefficient with steel, and good chemical stability. Because their primary metallic binder phase typically contains Ni / Co, Ti(C,N)-based cermets are often ferromagnetic. However, in complex applications, such as wear-resistant components in electronic instruments and cutting tools made of ferromagnetic materials, the presence of ferromagnetism can lead to poor surface quality and significantly shortened tool life. Therefore, there is an urgent need to develop new conductive, non-magnetic cermets.

[0003] WC is a good conductor of electricity and non-magnetic at room temperature. Its notable characteristics include high strength, wear resistance, and chemical stability. Compared to micron-sized ceramic phase powders, nanopowders are more soluble in the binder phase. Theoretically, adding nano-WC powders can help reduce the magnetic properties of cermets. However, the preparation of non-magnetic nanocomposite cermets using nano-WC as the functional phase faces the technical challenge of poor dispersion. Summary of the Invention

[0004] The main purpose of the present invention is to provide a metal ceramic and a preparation method and a cutting tool thereof, aiming to provide a conductive metal ceramic with low magnetic susceptibility.

[0005] To achieve the above object, the present invention provides a metal ceramic comprising the following components in weight percentage: TiC: 25-45%; TiN: 9.5-10%; Ni: 25-32%; Mo: 0-12%; and WC: 5-25%.

[0006] Optionally, the average particle size of the WC is 30-50 nm.

[0007] The present invention provides a method for preparing a metal ceramic, comprising the following steps:

[0008] S10, mixing WC with a solvent to obtain a uniformly dispersed WC powder suspension;

[0009] S20, mixing TiC, TiN, Ni, and Mo with the uniformly dispersed WC powder suspension to obtain a mixed slurry;

[0010] S30, ball-milling the mixed slurry to obtain a ball-milled mixed slurry;

[0011] S40, drying, compression molding, and vacuum sintering the mixed slurry in sequence to obtain a metal ceramic.

[0012] Optionally, in step S10:

[0013] The solvent includes anhydrous ethanol, and / or

[0014] The solvent includes anhydrous ethanol added with a non-ionic dispersant.

[0015] Optionally, in step S10:

[0016] The nonionic dispersant includes at least one of Triton X-100 and OP-10; and / or,

[0017] The addition amount of the nonionic dispersant is 1-2% of the mass of the WC.

[0018] Optionally, step S20 includes:

[0019] S21, mixing TiC, TiN, Ni, and Mo with the uniformly dispersed WC powder suspension to obtain a mixture;

[0020] S22, mixing the mixture with anhydrous ethanol to obtain a mixed slurry.

[0021] Optionally, in step S30:

[0022] The mixed slurry is ball-milled using WC-Co carbide balls; wherein,

[0023] The mass ratio of the WC-Co cemented carbide balls to the mixed slurry is 7:1-12:1.

[0024] Optionally, in step S40:

[0025] The drying is vacuum drying, the vacuum drying temperature is 78-90° C., and / or,

[0026] The vacuum drying time is 8-16 hours.

[0027] Optionally, in step S40:

[0028] The vacuum degree of the vacuum calcination is less than 1×10 -2 Pa, and / or,

[0029] The vacuum calcination temperature is 1420-1430°C, and / or,

[0030] The vacuum calcination time is 0.8-1.2h.

[0031] The present invention provides a cutting tool, comprising the metal ceramic described above, or the metal ceramic prepared by the method for preparing the metal ceramic described above.

[0032] In the technical solution provided by the present invention, the metal ceramic is made of TiC, TiN hard phase and Ni binder phase as the main raw materials, to which nano WC is added. Since WC is a good conductor of electricity and WC is solid-dissolved in the metal binder phase, the outer electrons of W are transferred to the empty orbit of nickel, which weakens the magnetic exchange effect of nickel. The magnetic susceptibility of the prepared conductive metal ceramic can be as low as 1.36×10 -5 . BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0034] Figure 1 A schematic flow chart of an embodiment of a method for preparing a metal ceramic provided by the present invention;

[0035] Figure 2 This is a SEM-BSE image of the metal ceramic provided in Example 5 of the present invention;

[0036] Figure 3 This is the room temperature hysteresis loop diagram of the metal ceramic provided in Example 5 of the present invention.

[0037] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0038] In order to make the purpose, 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. Where specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. Where the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be purchased commercially. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] Ti(C,N) based cermets as a kind of hard composite material, has high hardness, excellent wear resistance, low friction coefficient with steel, and good chemical stability, and has been widely used in cutting and wear-resistant fields. Because Ti(C,N) based cermets, its main component metal binder phase usually contains Ni / Co, often ferromagnetic. However, in some complex applications, such as wear-resistant parts in electronic instruments and cutting tools of ferromagnetic materials, the presence of ferromagnetic can cause the surface quality of the workpiece to be poor, and the service life of the tool is greatly shortened. Therefore, it is urgent to develop new conductive non-magnetic cermet materials.

[0040] WC is a good conductor of electricity, and at room temperature, it is non-magnetic, and its significant features are high strength, high wear resistance and high chemical stability. Compared with micron ceramic phase powder, nano powder is more easily dissolved in the binder phase, and theoretically, adding nano WC powder is beneficial to the reduction of the magnetism of the cermet. However, the preparation of non-magnetic nano composite cermet with nano WC as functional phase faces the technical problem of poor dispersibility.

[0041] In view of this, the present application provides a cermet, comprising: comprising the following weight percentage of components: TiC: 25-45%; TiN: 9.5-10%; Ni: 25-32%; Mo: 0-12%; and, WC: 5-25%.

[0042] In the technical solution of the present application, TiC, TiN hard phase and Ni binder phase are used as main raw materials, and WC is added. Since WC is a good conductor of electricity, and because of the solid solution of WC in the metal binder phase, the outer electrons of W are transferred into the empty orbit of nickel, weakening the magnetic exchange effect of nickel. The magnetic susceptibility of the prepared cermet can be as low as 1.36*10 -5 , and has good electrical conductivity. Among them, the role of adding elemental Mo is that Ni cannot completely infiltrate Ti(C,N) ceramic particles, resulting in low porosity and low mechanical properties of Ti(C,N) ceramic particles. Adding Mo can improve the wettability of Ni to Ti(C,N) ceramic particles and can refine the ceramic particles.

[0043] At the same time, the technical solution of the present application does not contain scarce resource Co, which has important significance for protecting mineral resources.

[0044] Further, the average particle size of the WC is 30-50 nm, i.e. the WC is a nano-level particle, because the nano-level WC is more easily dissolved in the binder phase, and theoretically, adding nano WC powder is beneficial to the reduction of the magnetism of the cermet. Therefore, in the case that other components are micron particles, the WC is a nano powder.

[0045] The present application provides a preparation method of cermet, comprising the following steps:

[0046] S10, mixing WC with a solvent to obtain a uniformly dispersed WC powder suspension;

[0047] Specifically, the present application does not limit the specific type of solvent. The main purpose is to dissolve and disperse WC to facilitate mixing of WC with other components. For example, the solvent can be anhydrous ethanol.

[0048] S20, mixing TiC, TiN, Ni, and Mo with the uniformly dispersed WC powder suspension to obtain a mixed slurry;

[0049] Specifically, TiC, TiN, Ni and Mo are put into the uniformly dispersed WC powder suspension.

[0050] S30, ball-milling the mixed slurry to obtain a ball-milled mixed slurry;

[0051] Specifically, the mixed slurry is ball-milled by a tool in order to mix the powders uniformly.

[0052] S40, drying, compression molding, and vacuum sintering the mixed slurry in sequence to obtain a metal ceramic.

[0053] The raw materials are mixed uniformly in the solvent, the mixed slurry is dried to return to a powdery state, and then sieved through an 80-100 mesh screen to obtain a powder of a suitable particle size. The sieved powder is pressed into a blank under a pressure of 300-350 MPa, and then vacuum sintered to form a cermet. The purpose is to allow the components to react with each other, dissolving WC in the binder phase and allowing Ni and Mo to infiltrate and bind the TiC and TiN hard phases.

[0054] The preparation method of the metal ceramic of the present application has simple process, convenient operation, low cost, and is suitable for industrial production.

[0055] Furthermore, in step S10, the solvent includes anhydrous ethanol, and / or the solvent includes anhydrous ethanol added with a non-ionic dispersant. To efficiently / effectively disperse the substance, a non-ionic dispersant, such as at least one of Triton X-100 and OP-10, may be added to the anhydrous ethanol as a solvent. To disperse the WC and other components, the non-ionic dispersant is added in an amount of 1-2% by mass of the WC, for example, 1%, 1.5%, 2%, etc. When the non-ionic dispersant is less than 1%, the dispersion effect is poor, and when it is greater than 2%, the non-ionic dispersant is wasted and the dispersion effect is poor. The non-ionic dispersant includes at least one of Triton X-100 and OP-10.

[0056] Step S20 includes:

[0057] S21, mixing TiC, TiN, Ni, and Mo with the uniformly dispersed WC powder suspension to obtain a mixture;

[0058] S22, mixing the mixture with anhydrous ethanol to obtain a mixed slurry.

[0059] Anhydrous ethanol is added during the mixing process of the components in order to further disperse and dissolve the components. Ultrasonic waves are used during the mixing process to promote the rapid dissolution of the components.

[0060] In step S30:

[0061] The mixed slurry is ball-milled using WC-Co carbide balls; wherein,

[0062] The mass ratio of the WC-Co cemented carbide balls to the mixed slurry is 7:1-12:1.

[0063] In step S40 , the reason for using WC-Co carbide balls for ball milling is that the balls made of this material are wear-resistant and will not introduce impurities that are detrimental to the performance of the metal ceramic during the ball milling process.

[0064] The drying is vacuum drying, the vacuum drying temperature is 78-90° C., and / or,

[0065] The vacuum drying time is 8-16 hours.

[0066] The drying effect is best under this drying temperature and drying time.

[0067] Furthermore, in step S40: the vacuum degree of the vacuum calcination is lower than 1×10 -2 Pa, and / or, the vacuum calcination temperature is 1420-1430° C., and / or, the vacuum calcination time is 0.8-1.2 h.

[0068] Specifically, during vacuum calcination, it is necessary to control the vacuum degree, temperature, and calcination time. If the vacuum degree, temperature, and calcination time are too low, no effect will be achieved. If they are too high, performance will be reduced, grains will grow, and production resources will be wasted.

[0069] The present invention provides a cutting tool, comprising the metal ceramic, or the metal ceramic prepared by the preparation method of the metal ceramic.

[0070] The cutting tool includes all the technical solutions of the metal ceramic, and thus also has all the beneficial effects brought by the above solutions, which will not be described in detail here. The cutting tool can be applied to various life scenarios including but not limited to.

[0071] The technical solutions of the present application are further described in detail below in combination with specific embodiments and drawings. It should be understood that the following embodiments are only used to explain the present application and do not limit the present application.

[0072] Embodiment 1

[0073] A cermet, comprising the following components by weight percentage: TiC: 40%, TiN: 10%, Ni: 30%, nano-WC: 20%.

[0074] The preparation method of the cermet comprises the following steps:

[0075] 1. A mass fraction of 1.5% of Pluronic X-100 is weighed, and the weighed Pluronic X-100 is added to a proper amount of anhydrous ethanol and ultrasonically dispersed for 10 min, and then nano-WC powder is added and ultrasonically dispersed for 20 min to obtain a uniformly dispersed nano-WC powder suspension;

[0076] 2. Micro-TiC, micro-TiN, micro-Ni, and the uniformly dispersed nano-WC powder suspension are added to a proper amount of anhydrous ethanol and ultrasonically dispersed for 30 min to obtain a uniformly mixed slurry;

[0077] 3. A proper amount of anhydrous ethanol is added as a medium to the uniformly mixed slurry to obtain a mixed slurry, wherein the grinding ball is a WC-Co hard alloy ball, the mass ratio of ball to material is 7:1, the rotation speed of the ball mill is 200 rpm, and the ball milling time is 48 h;

[0078] 4. The mixed slurry is placed in a vacuum drying oven for drying, and the dried powder is sieved with a 100-mesh sieve; the drying temperature is 80℃, and the time is 8 hours;

[0079] 5. The sieved mixed material is placed in a hard alloy mold and pressed into a blank under a pressure of 300 MPa;

[0080] 6. The blank is placed in a vacuum sintering furnace for sintering, the vacuum degree of the vacuum sintering furnace is controlled within 1×10 -2 Pa, the sintering temperature is 1420℃, and the sintering time is 1 h to obtain a room-temperature non-magnetic conductive cermet.

[0081] Embodiment 2

[0082] A cermet, comprising the following components by weight percentage: TiC: 35%, TiN: 10%, Ni: 30%, Mo: 5%, WC: 20%.

[0083] The preparation method of the cermet comprises the following steps:

[0084] 1. Weigh Triton X-100 with a mass fraction of WC 1.0%, add an appropriate amount of anhydrous ethanol to the weighed Triton X-100 and ultrasonically disperse it for 10 minutes, then add nano-WC powder and continue ultrasonically dispersing it for 10 minutes to obtain a uniformly dispersed nano-WC powder suspension;

[0085] 2. Add appropriate amount of anhydrous ethanol to the micron TiC, micron TiN, micron Mo, micron Ni and the uniformly dispersed nano WC powder suspension and ultrasonically disperse for 20 minutes to obtain a uniformly mixed slurry;

[0086] 3. Add an appropriate amount of anhydrous ethanol as a medium to the mixed slurry and perform ball milling to obtain a mixed slurry, wherein the grinding balls are WC-Co cemented carbide balls, the ball-to-material mass ratio is 8:1, the ball mill speed is 180 rpm, and the ball milling time is 50 h;

[0087] 4. Place the mixed slurry in a vacuum drying oven and dry it. Sieve the dried powder with an 80-mesh sieve. The drying temperature is 78°C and the drying time is 16 hours.

[0088] 5. Place the sieved mixture in a carbide mold and press it into a blank at a pressure of 350 MPa;

[0089] 6. Place the blank in a vacuum sintering furnace for sintering. The vacuum degree of the vacuum sintering furnace is controlled at 1×10 -2 Pa, the sintering temperature is 1420℃, the sintering time is 1h, and a non-magnetic conductive metal ceramic at room temperature is obtained.

[0090] Example 3

[0091] A metal ceramic comprises the following components in weight percentage: TiC: 42%, TiN: 10%, Ni: 30%, Mo: 8%, and WC: 10%.

[0092] The preparation method of the metal ceramic comprises the following steps:

[0093] 1. Weigh OP-10 with a mass fraction of WC 1.0%, add an appropriate amount of anhydrous ethanol to the weighed OP-10 and ultrasonically disperse it for 10 minutes, then add nano-WC powder and continue ultrasonically dispersing it for 20 minutes to obtain a uniformly dispersed nano-WC powder suspension;

[0094] 2. Add appropriate amount of anhydrous ethanol to the micron TiC, micron TiN, micron Mo, micron Ni and the uniformly dispersed nano WC powder suspension and ultrasonically disperse for 20 minutes to obtain a uniformly mixed slurry;

[0095] 3. Add an appropriate amount of anhydrous ethanol as a medium to the mixed slurry and perform ball milling to obtain a mixed slurry, wherein the grinding balls are WC-Co cemented carbide balls, the ball-to-material mass ratio is 8:1, the ball mill speed is 230 rpm, and the ball milling time is 36 h;

[0096] 4. Place the mixed slurry in a vacuum drying oven and dry it. Sieve the dried powder with an 80-mesh sieve. The drying temperature is 90°C and the drying time is 8 hours.

[0097] 5. Place the sieved mixture in a carbide mold and press it into a blank at a pressure of 300 MPa;

[0098] 6. Place the degreased blank in a vacuum sintering furnace for sintering. The vacuum degree of the vacuum sintering furnace is controlled at 1×10 -2 Pa, the sintering temperature is 1430℃, the sintering time is 1h, and a non-magnetic conductive metal ceramic at room temperature is obtained.

[0099] Example 4

[0100] A metal ceramic comprises the following components in weight percentage: TiC: 45%, TiN: 10%, Ni: 30%, Mo: 10%, and WC: 5%.

[0101] The preparation method of the metal ceramic is similar to that of Example 1.

[0102] Example 5

[0103] A metal ceramic comprises the following components in weight percentage: TiC: 40%, TiN: 10%, Ni: 30%, Mo: 10%, and WC: 10%.

[0104] The preparation method of the metal ceramic is similar to that of Example 1.

[0105] Example 6

[0106] A metal ceramic comprises the following components in weight percentage: TiC: 35%, TiN: 10%, Ni: 30%, Mo: 10%, and WC: 15%.

[0107] The preparation method of the metal ceramic is similar to that of Example 1.

[0108] Example 7

[0109] A metal ceramic comprises the following components in weight percentage: TiC: 30%, TiN: 10%, Ni: 30%, Mo: 10%, and WC: 20%.

[0110] The preparation method of the metal ceramic is similar to that of Example 1.

[0111] Example 8

[0112] A metal ceramic comprises the following components in weight percentage: TiC: 25%, TiN: 10%, Ni: 30%, Mo: 10%, and WC: 25%.

[0113] The preparation method of the metal ceramic is similar to that of Example 1.

[0114] Example 9

[0115] A metal ceramic comprises the following components in weight percentage: TiC: 43.5%, TiN: 9.5%, Ni: 30%, Mo: 12%, and WC: 5%.

[0116] The preparation method of the metal ceramic is similar to that of Example 1.

[0117] Comparative Example 1

[0118] A metal ceramic comprises the following components in weight percentage: TiC: 50%, TiN: 10%, Ni: 30%, and Mo: 10%.

[0119] The preparation method of the metal ceramic is similar to that of Example 1.

[0120] Comparative Example 2

[0121] A metal ceramic comprises the following components in weight percentage: TiC: 60%, TiN: 10%, and Ni: 30%.

[0122] The preparation method of the metal ceramic is similar to that of Example 1.

[0123] Comparative Example 3

[0124] A metal ceramic comprises the following components in weight percentage: TiC: 44%, TiN: 9%, Ni: 25%, and micron WC (0.82 μm): 22%.

[0125] The preparation method of the metal ceramic is similar to that of Example 1.

[0126] The formulations of Examples 1-9 and Comparative Examples 1-3 are summarized in Table 1 below.

[0127] Table 1 Formula (Amount of each component: mass percentage)

[0128]

[0129]

[0130] Performance Testing

[0131] The hardness, bending strength, magnetic susceptibility and resistivity of the cermet prepared by the prior art of Examples 1-9 and Comparative Examples 1-3 were detected, and the detection results are shown in Table 2.

[0132] Table 2: Hardness, bending strength, magnetic susceptibility and resistivity results of each cermet

[0133] hardness Bending strength magnetic susceptibility Resistivity Example 1 85.2HRA 1400MPa 1.57 x 10 -3 ]] 1.26 x 10 -6 Ω·m Example 2 86.2HRA 1512Mpa <![CDATA[6.7×10 -5 ]]> 1.91 x 10 -6 Ω·m Example 3 88HRA 1690Mpa <![CDATA[3.89×10 -4 ]]> <![CDATA[1.93×10 -6 Ohm]]> Example 4 88.3HRA 1528MPa <![CDATA[1.0×10 -3 ]]> <![CDATA[1.60×10 -6 Ohm]]> Example 5 88.4HRA 1760MPa <![CDATA[7.94×10 -4 ]]> <![CDATA[1.62×10 -6 Ohm]]> Example 6 88.5HRA 1620MPa <![CDATA[6.64×10 -4 ]]> <![CDATA[1.68×10 -6 Ohm]]> Example 7 87.5HRA 1608MPa <![CDATA[8.87×10 -5 ]]> <![CDATA[1.76×10 -6 Ohm]]> Example 8 87.4HRA 1553MPa 7.75 x 10 -5 ]] <![CDATA[1.89×10 -6 Ohm]]> Example 9 88.9MPa 1503MPa <![CDATA[1.36×10 -5 ]]> <![CDATA[1.68×10 -6 Ohm]]> Comparative Example 1 88.2HRA 1508MPa <![CDATA[1.94×10 -3 ]]> <![CDATA[1.58×10 -6 Ohm]]> Comparative Example 2 86.4HRA 1242MPa 1.03 <![CDATA[8.90×10 -7 Ohm]]> Comparative Example 3 87HRA 1758MPa <![CDATA[8.02×10 -1 ]]> <![CDATA[1.78×10 -6 Ohm]]>

[0134] From the results in Table 2, it can be seen that the cermet of the present application all have good electrical conductivity, and the addition of nano WC helps to reduce the magnetism of the cermet, and on this basis, the introduction of Mo component can further reduce the magnetism while improving the bending strength and hardness of the cermet. The cermet of the present application has weaker magnetism compared with the comparative examples.

[0135] Figure 2 SEM-BSE image of the cermet of Example 5, Figure 3 room temperature magnetic hysteresis loop diagram of the cermet of Example 5, from Figure 2 It can be seen from the above that the microstructure of the nano WC dispersed in Example 5 is uniform, indicating that the dispersion effect of the nano WC in the preparation process is good, and from Figure 3 It can be seen from the above that the cermet of Example 5 has no magnetism at room temperature and low magnetic susceptibility.

[0136] The above description is only the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made under the inventive concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A metal ceramic, characterized in that: The composition comprises the following components in weight percentage: TiC: 25-45%; TiN: 9.5-10%; Ni: 25-32%; Mo: 0-12%; and WC: 5-25%; wherein the average particle size of the WC is 30-50 nm; The preparation method of the metal ceramic comprises the following steps: S10, mixing WC with a solvent to obtain a uniformly dispersed WC powder suspension; wherein the solvent comprises anhydrous ethanol added with a non-ionic dispersant; the non-ionic dispersant comprises at least one of Triton X-100 and OP-10; S20, mixing TiC, TiN, Ni, and Mo with the uniformly dispersed WC powder suspension to obtain a mixed slurry; S30, ball-milling the mixed slurry to obtain a ball-milled mixed slurry; S40, drying, compression molding, and vacuum sintering the ball-milled mixed slurry in sequence to obtain a metal ceramic.

2. The metal ceramic according to claim 1, wherein In step S10: The addition amount of the nonionic dispersant is 1-2% of the mass of the WC.

3. The metal ceramic according to claim 1, wherein Step S20 includes: S21, mixing TiC, TiN, Ni, and Mo with the uniformly dispersed WC powder suspension to obtain a mixture; S22, mixing the mixture with anhydrous ethanol to obtain a mixed slurry.

4. The metal ceramic according to claim 1, wherein In step S30: The mixed slurry is ball-milled using WC-Co carbide balls; wherein, The mass ratio of the WC-Co cemented carbide balls to the mixed slurry is 7:1-12:

1.

5. The metal ceramic according to claim 1, wherein In step S40: The drying is vacuum drying, the vacuum drying temperature is 78-90° C., and / or, The vacuum drying time is 8-16 hours.

6. The metal ceramic according to claim 1, wherein: In step S40: The vacuum degree of the vacuum sintering is less than 1×10 -2 Pa, and / or, The vacuum sintering temperature is 1420-1430°C, and / or, The vacuum sintering time is 0.8-1.2h.

7. A cutting tool, characterized in that: The metal ceramic comprises the metal ceramic according to any one of claims 1 to 6.

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