A high temperature wear-resistant coating tool and preparation method thereof

Abstract

The present invention belongs to the technical field of mechanical processing tools, and specifically relates to a high-temperature wear-resistant coating tool and a preparation method thereof. The high-temperature wear-resistant coating tool prepared by a high-power pulsed magnetron sputtering process includes, from the substrate to the outside, an M bonding layer, an MN transition layer deposited on the surface of the M bonding layer, an NbN / CrB2 functional layer deposited on the surface of the MN transition layer, and a NbN coating deposited on the surface of the NbN / CrB2 functional layer; wherein the face-centered cubic structure MN in the high-temperature wear-resistant coating has excellent bonding strength to NbN, and in addition, the thickness of the NbN / CrB2 coating in the NbN / CrB2 functional layer presents a gradient trend, which can achieve the effect of reducing internal stress and preventing peeling. The coating prepared by the present invention not only has high-temperature stability and wear resistance, but also has high bonding strength and anti-stickiness, thereby solving the problem of easy wear and built-up edge when PVD coated tools cut high-temperature alloy materials, and the composite coating tool preparation process is simple, easy to operate, and suitable for industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing tools, and in particular relates to a high-temperature wear-resistant coating tool and a preparation method thereof. Background Art

[0002] With the continuous development of the aerospace field, materials such as titanium alloys and high-temperature alloys are widely used. When using coated tools to cut titanium alloys or high-temperature alloys, the high hardness of the materials will cause greater wear on the coated tools. Especially in high-speed cutting or heavy-load cutting, the contact between the coated tools and the workpiece is prone to friction and wear, resulting in a shortened tool life. In addition, the processing of titanium alloys and high-temperature alloys is often accompanied by high temperatures, which may cause the coated tools to be unable to effectively dissipate heat, resulting in increased cutting temperatures, affecting cutting performance and the surface quality of the cut workpiece. Under special cutting conditions of high temperature, high pressure and high speed, the coating of the coated tool may also peel off due to excessive force, reducing the service life of the tool. In order to cope with the problems arising in the processing of titanium alloys and high-temperature alloys, the high-temperature wear resistance and high-temperature oxidation resistance of the coating must be improved as soon as possible, and the coating's anti-adhesion and bonding strength also need to be improved. B series compounds are widely used in processing titanium alloys and high-temperature alloys. For example, the TiB2 coating prepared by PVD has high hardness, but it is prone to chipping when processing titanium alloys or high-temperature alloys, thus affecting the cutting performance. Some literature reports that adding appropriate Cr elements to the TiB2 coating can improve its coating hardness and crack resistance, but its high-temperature stability is poor. Some literature studies show that NbN has excellent high-temperature stability and still maintains good performance after treatment at 1000°C, but its hardness is relatively low. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the main purpose of the present invention is to propose a high-temperature wear-resistant coated tool and a preparation method thereof, which has excellent wear resistance, anti-stickiness and film-base bonding strength, and also has good resistance to high-temperature oxidation.

[0004] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0005] A high-temperature wear-resistant coating tool, comprising a cemented carbide tool substrate and a high-temperature wear-resistant coating on the substrate;

[0006] The high-temperature wear-resistant coating is prepared by a physical vapor deposition method and has a thickness of 1.5 to 6 μm. From the substrate to the outside, it includes an M bonding layer, an MN transition layer deposited on the surface of the M bonding layer, a NbN / CrB2 functional layer deposited on the surface of the MN transition layer, and a NbN coating deposited on the surface of the NbN / CrB2 functional layer.

[0007] As a preferred embodiment of the high-temperature wear-resistant coated tool described in the present invention, the thickness of the M bonding layer is 0.05-0.2 μm; the M bonding layer is any one of a Cr bonding layer, a Nb bonding layer, a Zr bonding layer, and a Ta bonding layer.

[0008] As a preferred solution of a high-temperature wear-resistant coated tool described in the present invention, wherein: the thickness of the MN transition layer is 0.1~0.5μm; the MN transition layer is any one of a CrN transition layer, a NbN transition layer, a ZrN transition layer, and a TaN transition layer.

[0009] As a preferred solution of a high-temperature wear-resistant coated tool described in the present invention, wherein: the thickness of the NbN / CrB2 functional layer is 0.5~5μm, the hardness is 26~42GPa, and the friction coefficient is 0.2~0.4.

[0010] As a preferred solution of the high-temperature wear-resistant coated tool described in the present invention, the thickness of the single-layer NbN and CrB2 of the NbN / CrB2 functional layer is 0.03-2 μm.

[0011] As a preferred solution of a high-temperature wear-resistant coated tool described in the present invention, wherein: the NbN and CrB2 coatings in the NbN / CrB2 functional layer are deposited alternately with a cycle of 2 to 80 times.

[0012] As a preferred solution of a high-temperature wear-resistant coated tool described in the present invention, wherein: the NbN and CrB2 coatings in the NbN / CrB2 functional layer are deposited alternately, the grain size of CrB2 is 6~25nm, and the grain size of NbN is 10~60nm.

[0013] As a preferred solution of a high-temperature wear-resistant coated tool described in the present invention, wherein: the NbN and CrB2 coatings in the NbN / CrB2 functional layer are deposited alternately, and the thickness of the NbN and CrB2 coatings present a gradient trend, such as a gradually increasing trend or a gradually decreasing trend.

[0014] As a preferred solution of the high-temperature wear-resistant coated tool described in the present invention, the thickness of the NbN coating is 0.1-1.0 μm, and the hardness is 22-34 GPa.

[0015] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution:

[0016] A method for preparing a high-temperature wear-resistant coating tool, wherein the high-temperature wear-resistant coating is prepared by a high-power pulsed magnetron sputtering process, comprising the following steps:

[0017] S1, depositing a bonding layer M on the substrate;

[0018] S2, depositing a MN transition layer on the surface of the M bonding layer;

[0019] S3. The NbN deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the MN transition layer are:

[0020] The temperature is 600~750℃, the bias voltage is -80~-120V, the Nb target sputtering power is 6000~10000W, and the pressure is 0.4~0.8Pa;

[0021] S4. The CrB2 deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the MN transition layer are:

[0022] The temperature is 600~750℃, the bias voltage is -80~-120V, the sputtering power of CrB2 target is 6000~12000W, and the pressure is 0.4~0.8Pa;

[0023] S5. Depositing a NbN coating on the surface of the NbN / CrB2 functional layer; the deposition process parameters are:

[0024] The temperature is 600~750℃, the bias voltage is -80~-120V, the Nb target sputtering power is 6000~10000W, and the pressure is 0.4~0.8Pa;

[0025] S6. After the temperature drops to room temperature, take out the sample to obtain a high-temperature wear-resistant coated tool.

[0026] As a preferred solution of the method for preparing a high-temperature wear-resistant coated tool described in the present invention, the method further includes, before step S5, repeating steps S3 and S4 to alternately deposit the NbN layer and the CrB2 layer in the NbN / CrB2 functional layer.

[0027] As a preferred solution of the method for preparing a high-temperature wear-resistant coating tool according to the present invention, the method further comprises:

[0028] S0. Pre-processing;

[0029] The carbide tool is used as a substrate. After being sandblasted, cleaned and dried, the substrate is placed on a rotating rack, and the surface of the substrate is cleaned by glow discharge.

[0030] As a preferred solution of the method for preparing a high-temperature wear-resistant coating tool described in the present invention, wherein: in the step S1, the specific process parameters for depositing the M bonding layer on the substrate are:

[0031] The temperature is 600~750℃, the bias voltage is -80~-120V, the M metal target sputtering power is 6000~12000W, and the pressure is 0.4~0.8Pa.

[0032] As a preferred embodiment of the method for preparing a high-temperature wear-resistant coating tool according to the present invention, the specific process parameters for depositing the MN transition layer on the surface of the M bonding layer in step S2 are:

[0033] The temperature is 600~750℃, the bias voltage is -80~-120V, the M metal sputtering power is 6000~12000W, and the pressure is 0.4~0.8Pa.

[0034] The beneficial effects of the present invention are as follows:

[0035] The present invention provides a high-temperature wear-resistant coating tool and a preparation method thereof. The coating prepared by the present invention not only has high-temperature stability and wear resistance, but also has high bonding strength and anti-adhesion, thereby solving the problem of easy wear and built-up edge when PVD coating tools cut high-temperature alloy materials. In addition, the composite coating tool preparation process is simple, easy to operate, and suitable for industrial production. It has the following advantages:

[0036] (1) Compared with the prior art, the high-temperature wear-resistant coating of the present invention is specially prepared by a high-power pulsed magnetron sputtering process. The M metal bonding layer and the MN coating in the high-temperature wear-resistant coating have excellent bonding strength, which plays an important role in the bonding between the NbN / CrB2 functional layer and the substrate.

[0037] (2) The thickness of the NbN and CrB2 coatings in the NbN / CrB2 functional layer of the coating of the present invention gradually increases or decreases, and the two coatings are deposited alternately. The thickness of the two coatings presents a gradient trend, which is beneficial to reducing the internal stress of the coatings and improving the bonding strength between the coatings. Moreover, the alternating deposition of the two coatings can effectively inhibit the growth of grains, thereby improving the hardness; the present invention can improve the bonding strength, hardness and internal stress reduction effect of the functional layer by setting a gradient trend for the thickness of the functional layer and periodically depositing it, thereby enhancing the service life of the tool.

[0038] (3) The NbN coating is deposited on the surface of the coating of the present invention, which exhibits excellent heat resistance and can help reduce thermal fatigue and oxidation of the tool at high temperatures; at the same time, the coating surface is smooth and has a low friction coefficient, which helps reduce friction and heat accumulation during the cutting process, and can improve cutting efficiency and workpiece surface quality.

[0039] (4) In the NbN / CrB2 functional layer of the coating of the present invention, NbN and CrB2 coatings are deposited alternately, which can effectively ensure the high temperature stability of the coating when cutting high temperature alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0041] Figure 1 It is a schematic cross-sectional view of the high temperature wear-resistant coating tool of the present invention.

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The present invention provides a high temperature wear-resistant coating tool and a preparation method thereof. The cross-sectional schematic diagram of the high temperature wear-resistant coating tool of the present invention is as follows: Figure 1 As shown, it is prepared by high-power pulsed magnetron sputtering process, and includes, from the substrate to the outside, an M bonding layer, an MN transition layer deposited on the surface of the M bonding layer, a NbN / CrB2 functional layer deposited on the surface of the MN transition layer, and a NbN coating deposited on the surface of the NbN / CrB2 functional layer; the face-centered cubic structure MN in the high-temperature wear-resistant coating has excellent bonding strength to NbN. In addition, the thickness of the NbN / CrB2 coating in the NbN / CrB2 functional layer presents a gradient trend, which can reduce the internal stress and prevent peeling.

[0045] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0046] Example 1

[0047] A method for preparing a high-temperature wear-resistant coating tool, wherein the high-temperature wear-resistant coating is prepared by a high-power pulsed magnetron sputtering process, comprising the following steps:

[0048] S0, using a carbide tool as a substrate, placing the substrate on a rotating rack after sandblasting, cleaning and drying, and performing glow discharge cleaning on the substrate surface;

[0049] S1. The deposition process parameters for depositing the Cr bonding layer on the substrate are:

[0050] The temperature was 650°C, the bias voltage was -80V, the sputtering power of the Cr target was 8000W, the pressure was 0.6Pa, and the deposition time was 120s;

[0051] S2. The deposition process parameters for depositing the CrN transition layer on the surface of the Cr bonding layer are:

[0052] The temperature was 650°C, the bias voltage was -80V, the sputtering power of the Cr target was 8000W, the pressure was 0.6Pa, and the deposition time was 240s;

[0053] S3. The NbN deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0054] The temperature was 650°C, the bias voltage was -80V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 10s;

[0055] S4. The CrB2 deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0056] The temperature is 650°C, the bias voltage is -80V, the sputtering power of the CrB2 target is 10000W, the pressure is 0.6Pa, and the deposition time is 10s;

[0057] S5, steps S3 and S4 are deposited alternately, the cycle is 40 times, the deposition time of NbN and CrB2 in each cycle increases by 10s respectively, and the other parameters are the same;

[0058] S6. Depositing a NbN coating on the surface of the NbN / CrB2 functional layer; the deposition process parameters are:

[0059] The temperature was 650°C, the bias voltage was -100V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 960s;

[0060] S7. After the temperature drops to room temperature, take out the sample at room temperature to obtain a high-temperature wear-resistant coated tool.

[0061] Example 2

[0062] A method for preparing a high-temperature wear-resistant coating tool, wherein the high-temperature wear-resistant coating is prepared by a high-power pulsed magnetron sputtering process, comprising the following steps:

[0063] S0, using a carbide tool as a substrate, placing the substrate on a rotating rack after sandblasting, cleaning and drying, and performing glow discharge cleaning on the substrate surface;

[0064] S1. The deposition process parameters for depositing the Cr bonding layer on the substrate are:

[0065] The temperature was 650°C, the bias voltage was -80V, the sputtering power of the Cr target was 8000W, the pressure was 0.6Pa, and the deposition time was 120s;

[0066] S2. The deposition process parameters for depositing the CrN transition layer on the surface of the Cr bonding layer are:

[0067] The temperature was 650°C, the bias voltage was -80V, the sputtering power of the Cr target was 8000W, the pressure was 0.6Pa, and the deposition time was 240s;

[0068] S3. The NbN deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0069] The temperature was 650°C, the bias voltage was -80V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 20s;

[0070] S4. The CrB2 deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0071] The temperature is 650°C, the bias voltage is -80V, the sputtering power of the CrB2 target is 10000W, the pressure is 0.6Pa, and the deposition time is 20s;

[0072] S5, steps S3 and S4 are deposited alternately, with 28 cycles, and the deposition time of NbN and CrB2 in each cycle increases by 20s respectively, and the other parameters are the same;

[0073] S6. Depositing a NbN coating on the surface of the NbN / CrB2 functional layer; the deposition process parameters are:

[0074] The temperature was 650°C, the bias voltage was -100V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 960s;

[0075] S7. After the temperature drops to room temperature, take out the sample at room temperature to obtain a high-temperature wear-resistant coated tool.

[0076] Example 3

[0077] A method for preparing a high-temperature wear-resistant coating tool, wherein the high-temperature wear-resistant coating is prepared by a high-power pulsed magnetron sputtering process, comprising the following steps:

[0078] S0, using a carbide tool as a substrate, placing the substrate on a rotating rack after sandblasting, cleaning and drying, and performing glow discharge cleaning on the substrate surface;

[0079] S1. The deposition process parameters for depositing the Cr bonding layer on the substrate are:

[0080] The temperature was 650°C, the bias voltage was -80V, the sputtering power of the Cr target was 8000W, the pressure was 0.6Pa, and the deposition time was 120s;

[0081] S2. The deposition process parameters for depositing the CrN transition layer on the surface of the Cr bonding layer are:

[0082] The temperature was 650°C, the bias voltage was -80V, the sputtering power of the Cr target was 8000W, the pressure was 0.6Pa, and the deposition time was 240s;

[0083] S3. The NbN deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0084] The temperature was 650°C, the bias voltage was -80V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 40s;

[0085] S4. The CrB2 deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0086] The temperature is 650°C, the bias voltage is -80V, the sputtering power of the CrB2 target is 10000W, the pressure is 0.6Pa, and the deposition time is 40s;

[0087] S5, steps S3 and S4 are deposited alternately, the cycle is 20 times, the deposition time of NbN and CrB2 in each cycle increases by 40s respectively, and the other parameters are the same;

[0088] S6. Depositing a NbN coating on the surface of the NbN / CrB2 functional layer; the deposition process parameters are:

[0089] The temperature was 650°C, the bias voltage was -100V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 960s;

[0090] S7. After the temperature drops to room temperature, take out the sample at room temperature to obtain a high-temperature wear-resistant coated tool.

[0091] Example 4

[0092] A method for preparing a high-temperature wear-resistant coating tool, wherein the high-temperature wear-resistant coating is prepared by a high-power pulsed magnetron sputtering process, comprising the following steps:

[0093] S0, using a carbide tool as a substrate, placing the substrate on a rotating rack after sandblasting, cleaning and drying, and performing glow discharge cleaning on the substrate surface;

[0094] S1. The deposition process parameters for depositing the Cr bonding layer on the substrate are:

[0095] The temperature was 650°C, the bias voltage was -80V, the sputtering power of the Cr target was 8000W, the pressure was 0.6Pa, and the deposition time was 120s;

[0096] S2. The deposition process parameters for depositing the CrN transition layer on the surface of the Cr bonding layer are:

[0097] The temperature was 650°C, the bias voltage was -80V, the sputtering power of the Cr target was 8000W, the pressure was 0.6Pa, and the deposition time was 240s;

[0098] S3. The NbN deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0099] The temperature was 650°C, the bias voltage was -80V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 80s;

[0100] S4. The CrB2 deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0101] The temperature is 650°C, the bias voltage is -80V, the sputtering power of the CrB2 target is 10000W, the pressure is 0.6Pa, and the deposition time is 80s;

[0102] S5, steps S3 and S4 are deposited alternately, the cycle is 14 times, the deposition time of NbN and CrB2 in each cycle increases by 80s respectively, and the other parameters are the same;

[0103] S6. Depositing a NbN coating on the surface of the NbN / CrB2 functional layer; the deposition process parameters are:

[0104] The temperature was 650°C, the bias voltage was -100V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 960s;

[0105] S7. After the temperature drops to room temperature, take out the sample at room temperature to obtain a high-temperature wear-resistant coated tool.

[0106] Example 5

[0107] A method for preparing a high-temperature wear-resistant coating tool, wherein the high-temperature wear-resistant coating is prepared by a high-power pulsed magnetron sputtering process, comprising the following steps:

[0108] S0, using a carbide tool as a substrate, placing the substrate on a rotating rack after sandblasting, cleaning and drying, and performing glow discharge cleaning on the substrate surface;

[0109] S1. The deposition process parameters for depositing the Cr bonding layer on the substrate are:

[0110] The temperature was 650°C, the bias voltage was -80V, the sputtering power of the Cr target was 8000W, the pressure was 0.6Pa, and the deposition time was 120s;

[0111] S2. The deposition process parameters for depositing the CrN transition layer on the surface of the Cr bonding layer are:

[0112] The temperature was 650°C, the bias voltage was -80V, the sputtering power of the Cr target was 8000W, the pressure was 0.6Pa, and the deposition time was 240s;

[0113] S3. The NbN deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0114] The temperature was 650°C, the bias voltage was -80V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 160s;

[0115] S4. The CrB2 deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0116] The temperature is 650°C, the bias voltage is -80V, the sputtering power of the CrB2 target is 10000W, the pressure is 0.6Pa, and the deposition time is 160s;

[0117] S5, steps S3 and S4 are deposited alternately, the cycle is 10 times, the deposition time of NbN and CrB2 in each cycle increases by 160s respectively, and the other parameters are the same;

[0118] S6. Depositing a NbN coating on the surface of the NbN / CrB2 functional layer; the deposition process parameters are:

[0119] The temperature was 650°C, the bias voltage was -100V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 960s;

[0120] S7. After the temperature drops to room temperature, take out the sample at room temperature to obtain a high-temperature wear-resistant coated tool.

[0121] Comparative Example 1

[0122] The difference from Embodiment 1 is that steps S1-S2 are not performed.

[0123] Comparative Example 2

[0124] The difference from Embodiment 1 is that step S6 is not performed.

[0125] Comparative Example 3

[0126] The difference from Example 1 is that

[0127] S3. The NbN deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0128] The temperature was 650°C, the bias voltage was -80V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 8200s;

[0129] S4. The CrB2 deposition process parameters in the NbN / CrB2 functional layer deposited on the surface of the CrN transition layer are:

[0130] The temperature is 650°C, the bias voltage is -80V, the CrB2 target sputtering power is 10000W, the pressure is 0.6Pa, and the deposition time is 8200s.

[0131] Comparative Example 4

[0132] The difference from Example 1 is that

[0133] S3. Deposit NbN coating on the surface of CrN transition layer, and the deposition process parameters are:

[0134] The temperature was 650°C, the bias voltage was -80V, the Nb target sputtering power was 8000W, the pressure was 0.6Pa, and the deposition time was 16400s;

[0135] Steps S4, S5, and S6 are not performed.

[0136] Comparative Example 5

[0137] The difference from Example 1 is that

[0138] S3. Deposit CrB2 coating on the surface of CrN transition layer, and the deposition process parameters are:

[0139] The temperature is 650°C, the bias voltage is -80V, the sputtering power of the CrB2 target is 10000W, the pressure is 0.6Pa, and the deposition time is 16400s;

[0140] Steps S4, S5, and S6 are not performed.

[0141] The performance of the cutting tools prepared in the embodiments and comparative examples was tested, and the results are shown in Table 1.

[0142] Table 1

[0143]

[0144] It can be seen from Table 1 that the high-temperature wear-resistant coating tool prepared in the embodiment of the present invention has higher hardness, bonding strength and high-temperature oxidation resistance than the control example, which means that the transition layer in the coating significantly improves the film-base bonding strength, and the thickness of the functional layer increases alternately in a gradient, which can effectively increase the hardness and oxidation resistance of the coating; in addition, the surface NbN also plays a role in reducing the friction coefficient and improving oxidation resistance.

[0145] The cutting performance of the high temperature wear-resistant coating cutting tools prepared by the embodiments and comparative examples of the present invention is tested as follows:

[0146] Test condition 1 is as follows:

[0147] Material: Nickel-based alloy GH4169

[0148] Tool type: CNMG120408-MC3

[0149] Cutting conditions: cutting speed 140m / min, feed 0.2mm / z, cutting depth 1.5mm

[0150] The measurement results of the tool flank wear VB (unit: mm) after cutting for different times are shown in Table 2. The tool flank wear was measured using an OLYMPUS SZ61 optical super-depth microscope with a scale.

[0151] Table 2

[0152]

[0153] It can be seen from Table 2 ("--" in Table 2 represents that the tool has failed) that, under the same tool substrate and the same cutting conditions, the cutting performance of the high temperature wear-resistant coating tool of the present invention is better than that of the comparative example.

[0154] The high-temperature wear-resistant coating tool prepared by the present invention using a high-power pulsed magnetron sputtering process includes, from the substrate to the outside, an M bonding layer, an MN transition layer deposited on the surface of the M bonding layer, a NbN / CrB2 functional layer deposited on the surface of the MN transition layer, and a NbN coating deposited on the surface of the NbN / CrB2 functional layer; wherein the face-centered cubic structure MN in the high-temperature wear-resistant coating has excellent bonding strength to NbN, and in addition, the thickness of the NbN / CrB2 coating in the NbN / CrB2 functional layer presents a gradient trend, which can achieve the effect of reducing internal stress and preventing peeling. The coating prepared by the present invention not only has high-temperature stability and wear resistance, but also has high bonding strength and anti-stickiness, thereby solving the problem of easy wear and built-up edge when PVD coated tools cut high-temperature alloy materials, and the composite coating tool preparation process is simple, easy to operate, and suitable for industrial production.

[0155] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A high temperature wear-resistant coated tool, It is characterized in that It includes a carbide tool substrate and a high temperature wear-resistant coating on the substrate; The high temperature wear-resistant coating is prepared by physical vapor deposition method and has a thickness of 1.5-6 μm. From the substrate to the outside, it includes an M bonding layer, an MN transition layer deposited on the surface of the M bonding layer, and an NbN / CrB 2 Functional layer, deposited on NbN / CrB 2 The NbN coating on the surface of the functional layer, the NbN / CrB 2 NbN and CrB in functional layers 2 The coatings are deposited alternately.

2. The high temperature wear-resistant coated tool according to claim 1, It is characterized in that The thickness of the M bonding layer is 0.05-0.2 μm; the M bonding layer is any one of a Cr bonding layer, a Zr bonding layer, and a Ta bonding layer.

3. The high temperature wear-resistant coated tool according to claim 1, It is characterized in that The thickness of the MN transition layer is 0.1-0.5 μm; the MN transition layer is any one of a CrN transition layer, a ZrN transition layer and a TaN transition layer.

4. The high temperature wear-resistant coated tool according to claim 1, It is characterized in that The NbN / CrB 2 The thickness of the functional layer is 0.5~5μm, the hardness is 26~42GPa, and the friction coefficient is 0.2~0.

4.

5. The high temperature wear-resistant coated tool according to claim 1, It is characterized in that The NbN / CrB 2 Functional layer of single layer NbN or CrB 2 The thickness is 0.03~2μm.

6. The high temperature wear-resistant coated tool according to claim 1, It is characterized in that The NbN / CrB 2 NbN and CrB in functional layers 2 The cycle of alternating deposition of coatings is 2 to 80 times, CrB 2 The grain size of is 6~25nm, and the grain size of NbN is 10~60nm.

7. The high temperature wear-resistant coated tool according to claim 1, It is characterized in that The NbN / CrB 2 NbN and CrB in functional layers 2 The coatings are deposited alternately, with NbN and CrB 2 The coating thickness shows a gradient trend.

8. The high temperature wear-resistant coated tool according to claim 1, It is characterized in that The NbN coating has a thickness of 0.1-1.0 μm and a hardness of 22-34 GPa.

9. A method for preparing a high temperature wear-resistant coating tool according to any one of claims 1 to 8, It is characterized in that The high temperature wear-resistant coating is prepared by a high power pulsed magnetron sputtering process, comprising the following steps: S1, depositing a bonding layer M on the substrate; S2, depositing a MN transition layer on the surface of the M bonding layer; S3, depositing NbN / CrB on the surface of MN transition layer 2 The NbN deposition process parameters in the functional layer are: The temperature is 600~750℃, the bias voltage is -80~-120V, the Nb target sputtering power is 6000~10000W, and the pressure is 0.4~0.8Pa; S4. Deposition of NbN / CrB on the surface of MN transition layer 2 CrB in the functional layer 2 The deposition process parameters are: Temperature is 600~750℃, bias voltage is -80~-120V, CrB 2 The target sputtering power is 6000~12000W and the pressure is 0.4~0.8Pa; S5, in NbN / CrB 2 The NbN coating is deposited on the surface of the functional layer; the deposition process parameters are: The temperature is 600~750℃, the bias voltage is -80~-120V, the Nb target sputtering power is 6000~10000W, and the pressure is 0.4~0.8Pa; S6. After the temperature drops to room temperature, take out the sample to obtain a high-temperature wear-resistant coated tool.

10. The method for preparing a high temperature wear-resistant coating tool according to claim 9, It is characterized in that In step S1, the specific process parameters for depositing the M bonding layer on the substrate are: The temperature is 600~750℃, the bias voltage is -80~-120V, the sputtering power of the M metal target is 6000~12000W, and the pressure is 0.4~0.8Pa; In step S2, the specific process parameters for depositing the MN transition layer on the surface of the M bonding layer are: The temperature is 600~750℃, the bias voltage is -80~-120V, the M metal sputtering power is 6000~12000W, and the pressure is 0.4~0.8Pa.

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