Preparation method of rare earth element doped tungsten alloy coating

Abstract

The invention relates to the technical field of coatings, in particular to a preparation method of a rare earth element doped tungsten alloy coating. The preparation method comprises the following steps: a mixing procedure: mixing first powder containing a rare earth element and second powder containing a tungsten element to obtain a mixture; a die-casting procedure: carrying out die-casting treatment on the mixture to obtain a cast ingot; a heat treatment step for heat-treating the cast ingot to obtain a solid solution; a machining procedure: machining the solid solution to obtain a target material containing a rare earth element and a tungsten element; and the deposition process is conducted, specifically, the target material is subjected to deposition treatment, so that the rare earth element and the tungsten element in the target material are deposited on the surface of the workpiece to be machined, and the rare earth element doped tungsten alloy coating is obtained. According to the preparation method, the prepared tungsten alloy coating has good weather resistance and corrosion resistance, so that the increasing development requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a method for preparing a rare earth element doped tungsten alloy coating. Background Art

[0002] Tungsten alloy coatings are favored due to their excellent properties such as high hardness and high wear resistance, and are widely used in various mechanical parts. As tungsten alloy coatings are widely used in mechanical parts, the requirements for them are getting higher and higher. However, in the relevant technology, the weather resistance and corrosion resistance of tungsten alloys cannot meet the increasing development needs. Summary of the invention

[0003] The present invention provides a method for preparing a rare earth element doped tungsten alloy coating, which can make the prepared tungsten alloy coating have good weather resistance and corrosion resistance, thereby meeting the increasing development needs.

[0004] The embodiment of the present invention provides a method for preparing a rare earth element doped tungsten alloy coating, comprising:

[0005] A mixing step of mixing a first powder containing a rare earth element and a second powder containing a tungsten element to obtain a mixed material;

[0006] A die-casting step, wherein the mixed material is subjected to a die-casting process to obtain an ingot;

[0007] A heat treatment step of heat treating the ingot to obtain a solid solution;

[0008] A machining step of machining the solid solution to obtain a target material containing rare earth elements and tungsten elements;

[0009] The deposition process is to perform deposition treatment on the target material so as to deposit the rare earth element and tungsten element in the target material on the surface of the workpiece to be processed, thereby obtaining a rare earth element-doped tungsten alloy coating.

[0010] In some embodiments of the present invention, in the mixing process, the mass ratio of the rare earth element to the tungsten element is 1:(50-80).

[0011] In some embodiments of the present invention, in the mixing process, the rare earth element includes at least one of lanthanum, cerium, europium, ytterbium, terbium and dysprosium, and the second powder further includes nickel.

[0012] In some embodiments of the present invention, in the mixing process, the ratio of the mass content of the tungsten element in the second powder to the mass content of the nickel element in the second powder is (6-9):1.

[0013] In some embodiments of the present invention, in the mixing process, the particle size of the first powder is 10 μm to 30 μm, and the particle size of the second powder is 50 μm to 80 μm.

[0014] In some embodiments of the present invention, before the mixing step, the method further comprises:

[0015] In the grinding step, the first powder and the second powder are respectively ground to obtain the first powder with a particle size of 10 μm to 30 μm and the second powder with a particle size of 50 μm to 80 μm.

[0016] In some embodiments of the present invention, in the die-casting process, the temperature of the die-casting process is 800° C. to 1000° C., and the pressure of the die-casting is 250 MPa to 300 MPa.

[0017] In some embodiments of the present invention, in the heat treatment process, the heat treatment temperature is 600° C. to 800° C., and the heat treatment time is 1 h to 2 h.

[0018] In some embodiments of the present invention, the deposition process comprises a physical vapor deposition process.

[0019] In some embodiments of the present invention, the deposition process comprises:

[0020] Inert gas was introduced at a flow rate of 30sccm-100sccm, bias voltage 100V-120V, duty cycle 55%-65%, vacuum degree 3×10 -4 Pa~2×10 -3 After Pa and temperature reach 350°C to 400°C, the power supply of the target material is started, and physical vapor deposition treatment is performed under the condition of a current of 100A to 150A to deposit the rare earth elements and tungsten elements in the target material on the surface of the workpiece to be processed to obtain a rare earth element-doped tungsten alloy coating.

[0021] The method for preparing the rare earth element doped tungsten alloy coating provided by the embodiment of the present invention can help to form a target material doped with rare earth elements in the tungsten alloy through a mixing process, a die-casting process, a heat treatment process and a machining process, thereby reducing the impurity content in the coating. Moreover, through the deposition process, it can help the rare earth elements to be uniformly doped in the tungsten alloy coating, which can reduce the size of the grains in the coating, so that it forms a coating with a dense structure to enhance its hardness and wear resistance, and can also improve the weather resistance and corrosion resistance of the coating. Therefore, the preparation method provided by the embodiment of the present invention can not only improve the hardness and wear resistance of the tungsten alloy coating, but also improve the weather resistance and corrosion resistance of the coating, thereby meeting the increasing development needs.

[0022] The above description is only an overview of the technical solution of this specification. In order to more clearly understand the technical means of this specification, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of this specification more obvious and easy to understand, the specific implementation methods of this specification are listed below.

[0023] Instruction Manual

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic flow chart of a method for preparing a rare earth element-doped tungsten alloy coating provided in some embodiments of the present invention is shown. DETAILED DESCRIPTION

[0026] The "range" disclosed in the present invention is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range.

[0027] Unless otherwise specified, the terms used in the present invention have the commonly understood meanings that are generally understood by those skilled in the art.

[0028] Unless otherwise specified, the values ​​of the parameters mentioned in the present invention can be measured by various test methods commonly used in the art, for example, they can be measured according to the test methods given in the embodiments of the present invention.

[0029] See also Figure 1 As shown, an embodiment of the present invention provides a method for preparing a rare earth element doped tungsten alloy coating, comprising:

[0030] S100, a mixing step of mixing a first powder containing a rare earth element and a second powder containing a tungsten element to obtain a mixed material;

[0031] S200, a die-casting step, subjecting the mixed material to a die-casting process to obtain an ingot;

[0032] S300, a heat treatment step of heat treating the ingot to obtain a solid solution;

[0033] S400, a machining step of machining the solid solution to obtain a target material containing rare earth elements and tungsten elements;

[0034] S500, a deposition process, performing a deposition process on the target material to deposit the rare earth element and tungsten element in the target material on the surface of the workpiece to be processed, so as to obtain a rare earth element-doped tungsten alloy coating.

[0035] The method for preparing the rare earth element doped tungsten alloy coating provided by the embodiment of the present invention can help to form a target material doped with rare earth elements in the tungsten alloy through a mixing process, a die-casting process, a heat treatment process and a machining process, thereby reducing the impurity content in the coating. Moreover, through the deposition process, it can help the rare earth elements to be uniformly doped in the tungsten alloy coating, which can reduce the size of the grains in the coating, so that it forms a coating with a dense structure to enhance its hardness and wear resistance, and can also improve the weather resistance and corrosion resistance of the coating. Therefore, the preparation method provided by the embodiment of the present invention can not only improve the hardness and wear resistance of the tungsten alloy coating, but also improve the weather resistance and corrosion resistance of the coating, thereby meeting the increasing development needs.

[0036] In some embodiments of the present invention, in the mixing process, the mass ratio of the rare earth element to the tungsten element is 1:(50-80). The mass ratio of the rare earth element to the tungsten element within the above-mentioned suitable range can help improve the weather resistance and corrosion resistance of the coating, and can also further improve the hardness and wear resistance of the coating.

[0037] Exemplarily, the mass ratio of the rare earth element to the tungsten element may be, but is not limited to, 1:50, 1:55, 1:60, 1:65, 1:70, 1:75, or 1:80.

[0038] In some embodiments of the present invention, in the mixing process, the rare earth element includes at least one of lanthanum, cerium, europium, ytterbium, terbium and dysprosium, and the second powder also includes nickel. Selecting the above suitable types of rare earth elements can further enhance the weather resistance and corrosion resistance of the coating, and the second powder includes nickel, which can further improve the hardness and wear resistance of the coating.

[0039] In some embodiments of the present invention, in the mixing process, the ratio of the mass content of the tungsten element in the second powder to the mass content of the nickel element in the second powder is (6-9):1.

[0040] In some embodiments of the present invention, in the mixing process, the particle size of the first powder is 10 μm to 30 μm, and the particle size of the second powder is 50 μm to 80 μm. The above particle size setting can help reduce the size of grains in the coating, thereby forming a coating with a dense structure.

[0041] In some embodiments of the present invention, before the mixing step, the method further comprises:

[0042] In the grinding step, the first powder and the second powder are respectively ground to obtain the first powder with a particle size of 10 μm to 30 μm and the second powder with a particle size of 50 μm to 80 μm.

[0043] In some embodiments of the present invention, in the die-casting process, the temperature of the die-casting process is 800°C to 1000°C, and the pressure of the die-casting process is 250MPa to 300MPa. Under the temperature of 800°C to 1000°C and the pressure of 250MPa to 300MPa, the gaps between the powders can be reduced, which helps to form a solid target material, which can not only reduce the risk of cracks or breakage of the target material during use.

[0044] In some embodiments of the present invention, in the heat treatment process, the heat treatment temperature is 600°C to 800°C, and the heat treatment time is 1h to 2h. In the temperature range of 600°C to 800°C, the metal elements can be mixed more evenly, thereby improving the strength of the solid solution. In addition, the heat treatment process can also promote grain refinement, which helps to improve the uniformity and quality of the coating during the sputtering process.

[0045] In some embodiments of the present invention, the deposition process comprises a physical vapor deposition process.

[0046] In some embodiments of the present invention, the deposition process includes:

[0047] Inert gas was introduced at a flow rate of 30sccm-100sccm, bias voltage 100V-120V, duty cycle 55%-65%, vacuum degree 3×10 -4 Pa~2×10 -3 After Pa and temperature reach 350℃~400℃, start the power supply of the target material, and carry out physical vapor deposition treatment under the condition of current of 100A~150A to deposit the rare earth elements and tungsten elements in the target material on the surface of the workpiece to be processed, and obtain a rare earth element doped tungsten alloy coating.

[0048] The following embodiments describe the disclosure of the present invention in more detail, and these embodiments are only used for illustrative explanations, because it is obvious to those skilled in the art that various modifications and changes are made within the scope of the disclosure of the present invention. Unless otherwise stated, all parts, percentages and ratios reported in the following embodiments are based on mass, and all reagents used in the embodiments are commercially available or synthesized according to conventional methods, and can be used directly without further processing, and the instruments used in the embodiments are commercially available.

[0049] Example 1

[0050] This embodiment provides a method for preparing a rare earth element doped tungsten alloy coating, comprising:

[0051] Grinding W powder with a purity of 99.999% and lanthanum powder with a purity of 99.995% to obtain W powder with an average particle size of 55 μm and lanthanum powder with an average particle size of 15 μm respectively;

[0052] Grind and mix W powder with an average particle size of 55 μm and lanthanum powder with an average particle size of 15 μm in a mass ratio of 50:1 to obtain a mixture;

[0053] The mixed material is subjected to die casting treatment at a temperature of 1000° C., a pressure of 250 MPa, and a time of 5 h to obtain an ingot;

[0054] The ingot is heat treated at a temperature of 800° C. for 2 h to obtain a solid solution;

[0055] machining the solid solution to obtain a target material;

[0056] Argon gas was introduced at a flow rate of 50 sccm, and the bias voltage was 110 V, the duty cycle was 55%, and the vacuum degree was 3×10 -4 After Pa and temperature reach 370°C, the power supply of the target material is started, and physical vapor deposition treatment is performed under the condition of a current of 120A to deposit the rare earth elements and tungsten elements in the target material on the surface of the steel plate to obtain a rare earth element-doped tungsten alloy coating.

[0057] Example 2

[0058] This embodiment provides a method for preparing a rare earth element doped tungsten alloy coating, comprising:

[0059] Grinding W powder with a purity of 99.999% and lanthanum powder with a purity of 99.995% to obtain W powder with an average particle size of 60 μm and lanthanum powder with an average particle size of 20 μm respectively;

[0060] Grind and mix W powder with an average particle size of 60 μm and lanthanum powder with an average particle size of 20 μm in a mass ratio of 50:1 to obtain a mixture;

[0061] The mixed material is subjected to die casting treatment at a temperature of 1000° C., a pressure of 250 MPa, and a time of 5 h to obtain an ingot;

[0062] The ingot is heat treated at a temperature of 800° C. for 2 h to obtain a solid solution;

[0063] machining the solid solution to obtain a target material;

[0064] Argon gas was introduced at a flow rate of 50 sccm, and the bias voltage was 110 V, the duty cycle was 55%, and the vacuum degree was 3×10 -4 After Pa and temperature reach 370°C, the power supply of the target material is started, and physical vapor deposition treatment is performed under the condition of a current of 120A to deposit the rare earth elements and tungsten elements in the target material on the surface of the steel plate to obtain a rare earth element-doped tungsten alloy coating.

[0065] Example 3

[0066] This embodiment provides a method for preparing a rare earth element doped tungsten alloy coating, comprising:

[0067] Grinding W powder with a purity of 99.999% and lanthanum powder with a purity of 99.995% to obtain W powder with an average particle size of 75 μm and lanthanum powder with an average particle size of 25 μm respectively;

[0068] Grind and mix W powder with an average particle size of 75 μm and lanthanum powder with an average particle size of 25 μm in a mass ratio of 50:1 to obtain a mixture;

[0069] The mixed material is subjected to die casting treatment at a temperature of 1000° C., a pressure of 250 MPa, and a time of 5 h to obtain an ingot;

[0070] The ingot is heat treated at a temperature of 800° C. for 2 h to obtain a solid solution;

[0071] machining the solid solution to obtain a target material;

[0072] Argon gas was introduced at a flow rate of 50 sccm, and the bias voltage was 110 V, the duty cycle was 55%, and the vacuum degree was 3×10 -4 After Pa and temperature reach 370°C, the power supply of the target material is started, and physical vapor deposition treatment is performed under the condition of a current of 120A to deposit the rare earth elements and tungsten elements in the target material on the surface of the steel plate to obtain a rare earth element-doped tungsten alloy coating.

[0073] Example 4

[0074] This embodiment provides a method for preparing a rare earth element doped tungsten alloy coating, comprising:

[0075] Grinding W powder with a purity of 99.999% and lanthanum powder with a purity of 99.995% to obtain W powder with an average particle size of 55 μm and lanthanum powder with an average particle size of 15 μm respectively;

[0076] Grind and mix W powder with an average particle size of 55 μm and lanthanum powder with an average particle size of 15 μm in a mass ratio of 60:1 to obtain a mixture;

[0077] The mixed material is subjected to die casting treatment at a temperature of 1000° C., a pressure of 250 MPa, and a time of 5 h to obtain an ingot;

[0078] The ingot is heat treated at a temperature of 800° C. for 2 h to obtain a solid solution;

[0079] machining the solid solution to obtain a target material;

[0080] Argon gas was introduced at a flow rate of 50 sccm, and the bias voltage was 110 V, the duty cycle was 55%, and the vacuum degree was 3×10 -4 After Pa and temperature reach 370°C, the power supply of the target material is started, and physical vapor deposition treatment is performed under the condition of a current of 120A to deposit the rare earth elements and tungsten elements in the target material on the surface of the steel plate to obtain a rare earth element-doped tungsten alloy coating.

[0081] Example 5

[0082] This embodiment provides a method for preparing a rare earth element doped tungsten alloy coating, comprising:

[0083] Grinding W powder with a purity of 99.999% and lanthanum powder with a purity of 99.995% to obtain W powder with an average particle size of 55 μm and lanthanum powder with an average particle size of 15 μm respectively;

[0084] Grind and mix W powder with an average particle size of 55 μm and lanthanum powder with an average particle size of 15 μm in a mass ratio of 80:1 to obtain a mixture;

[0085] The mixed material is subjected to die casting treatment at a temperature of 1000° C., a pressure of 250 MPa, and a time of 5 h to obtain an ingot;

[0086] The ingot is heat treated at a temperature of 800° C. for 2 h to obtain a solid solution;

[0087] machining the solid solution to obtain a target material;

[0088] Argon gas was introduced at a flow rate of 50 sccm, and the bias voltage was 110 V, the duty cycle was 55%, and the vacuum degree was 3×10 -4 After Pa and temperature reach 370°C, the power supply of the target material is started, and physical vapor deposition treatment is performed under the condition of a current of 120A to deposit the rare earth elements and tungsten elements in the target material on the surface of the steel plate to obtain a rare earth element-doped tungsten alloy coating.

[0089] Example 6

[0090] This embodiment provides a method for preparing a rare earth element doped tungsten alloy coating, comprising:

[0091] The nickel-tungsten alloy powder containing 89% W and 10% Ni and the 99.995% lanthanum powder were ground respectively to obtain W powder with an average particle size of 55 μm and lanthanum powder with an average particle size of 15 μm;

[0092] Grind and mix W powder with an average particle size of 55 μm and lanthanum powder with an average particle size of 15 μm in a mass ratio of 70:1 to obtain a mixture;

[0093] The mixed material is subjected to die casting treatment at a temperature of 1000° C., a pressure of 250 MPa, and a time of 5 h to obtain an ingot;

[0094] The ingot is heat treated at a temperature of 800° C. for 2 h to obtain a solid solution;

[0095] machining the solid solution to obtain a target material;

[0096] Argon gas was introduced at a flow rate of 50 sccm, and the bias voltage was 110 V, the duty cycle was 55%, and the vacuum degree was 3×10 -4 After Pa and temperature reach 370°C, the power supply of the target material is started, and physical vapor deposition treatment is performed under the condition of a current of 120A to deposit the rare earth elements and tungsten elements in the target material on the surface of the steel plate to obtain a rare earth element-doped tungsten alloy coating.

[0097] Example 7

[0098] This embodiment provides a method for preparing a rare earth element doped tungsten alloy coating, comprising:

[0099] The W powder with a purity of 99.999% and the rare earth powder containing 48% of lanthanum and 51% of cerium are ground respectively to obtain W powder with an average particle size of 55 μm and lanthanum powder with an average particle size of 15 μm;

[0100] Grind and mix W powder with an average particle size of 55 μm and rare earth powder with an average particle size of 15 μm in a mass ratio of 50:1 to obtain a mixture;

[0101] The mixed material is subjected to die casting treatment at a temperature of 1000° C., a pressure of 250 MPa, and a time of 5 h to obtain an ingot;

[0102] The ingot is heat treated at a temperature of 800° C. for 2 h to obtain a solid solution;

[0103] machining the solid solution to obtain a target material;

[0104] Argon gas was introduced at a flow rate of 50 sccm, and the bias voltage was 110 V, the duty cycle was 55%, and the vacuum degree was 3×10 -4After Pa and temperature reach 370°C, the power supply of the target material is started, and physical vapor deposition treatment is performed under the condition of a current of 120A to deposit the rare earth elements and tungsten elements in the target material on the surface of the steel plate to obtain a rare earth element-doped tungsten alloy coating.

[0105] Comparative Example 1

[0106] This comparative example provides a method for preparing a tungsten alloy coating, comprising:

[0107] Combine Na2WO4.2H2060g / L, Ni SO47H2080g / L, H3PO330g / L, La 3+ 5g / L, HSB0310g / L, H3PO415g / L, ammonium sulfate32g / , sodium allyl sulfonate60g / L, trimethyl dodecyl ammonium chloride8g / L, polymethacrylic acid8g / L, ammonium alginate15g / L, ZrO2 particles (average particle size d=3μm)80g / L were mixed to obtain an electroplating solution;

[0108] After a series of pre-treatments such as degreasing, strong etching, and weak erosion, the steel plate is subjected to composite electroplating. The pulse composite electroplating is carried out using a bidirectional pulse current with controlled current. The forward current conduction time is controlled at 1s, the disconnection time is controlled at 200ms, and the average current density is controlled at 220mA / cm 2 ; The on-time of the reverse pulse current is controlled at 50ms, the current off-time is controlled at 1s, and the average current density is controlled at 10mA / cnft iis; the La-doped nickel-tungsten alloy coating is obtained by electroplating at a temperature of 20°C for 100h.

[0109] Test Section

[0110] 1) Grain size test

[0111] The tungsten alloy coatings prepared in Examples 1 to 7 and Comparative Example 1 were characterized by transmission electron microscopy. TEM samples (5 μm×10 μm×0.08 μm) were prepared using a focused ion beam (FIB) and tested using a Thermo Fisher Scientific Talos F200X scanning transmission electron microscope with an accelerating voltage of 100 kV-200 kV. The test results are shown in Table 1.

[0112] 2) Hardness test

[0113] The test was carried out according to the method of national standard GB / T4340-1990. The test results are shown in Table 1.

[0114] 3) Wear resistance test

[0115] The tungsten alloy coatings prepared in Examples 1 to 7 and Comparative Example 1 were placed on a vertical universal wear tester to test their wear. The rotation speed during the test was 300 rpm, the load was 9 N, the grinding wheel was GCr15, and the test time was 1 h. The test results are shown in Table 1.

[0116] 4) Weather resistance test

[0117] Under the condition of 85% relative humidity and 85°C high temperature treatment, the square resistance of the coating was measured and the holding time of the square resistance was recorded. The test results are shown in Table 1, wherein the longer the holding time of the square resistance is, the better the weather resistance is.

[0118] 5) Corrosion resistance test

[0119] The steel plate with tungsten alloy coating was placed in a cyclic corrosion test box and subjected to 20 cycles of cyclic corrosion test. The cyclic corrosion test met the requirements of Appendix A of ISO1 1997-1:2017. Then the time for red rust to appear on the surface of the alloy was observed. The longer the red rust appears, the better the corrosion resistance. The test results are shown in Table 1.

[0120] Table 1 Test results of Examples 1 to 7 and Comparative Example 1

[0121]

[0122]

[0123] According to Table 1, by comparing the test results of Examples 1 to 3, it can be seen that as the ratio of tungsten to rare earth elements gradually increases, the hardness and wear resistance will increase, while the weather resistance and corrosion resistance will decrease. It can be seen that an increase in tungsten content can help improve the hardness and wear resistance of the coating, while an increase in rare earth element content can help improve the weather resistance and corrosion resistance of the coating.

[0124] By comparing the test results of Example 1, Example 4 and Example 5, it can be seen that as the particle size of the first powder and the second powder increases, the size of the grains in the coating will gradually increase, and then the hardness, wear resistance, weather resistance and corrosion resistance will all decrease. It can be seen that powder with a small particle size helps to reduce the size of the grains, thereby improving the hardness, wear resistance, weather resistance and corrosion resistance.

[0125] Comparing the test results of Example 1 with those of Example 6, it can be seen that the addition of nickel element can help to improve the hardness and wear resistance of the coating.

[0126] Comparing the test results of Example 1 and Example 7, it can be seen that doping with multiple rare earth elements can help improve hardness, wear resistance, weather resistance and corrosion resistance.

[0127] Compared with Comparative Example 1, the present invention can help form a target material doped with rare earth elements in a tungsten alloy through a mixing process, a die-casting process, a heat treatment process, and a machining process, thereby reducing the impurity content in the coating. Moreover, through the deposition process, it can help the rare earth elements to be uniformly doped in the tungsten alloy coating, which can reduce the size of the grains in the coating, so that it forms a coating with a dense structure to enhance its hardness and wear resistance, and can also improve the weather resistance and corrosion resistance of the coating. However, the grain size in the coating formed by electroplating in Comparative Example 1 is relatively large, resulting in its hardness and wear resistance being far inferior to the embodiments provided by the present invention, and the doping of rare earth elements is not easy to control, resulting in its weather resistance and corrosion resistance being inferior to the embodiments provided by the present invention.

[0128] In summary, the preparation method provided by the embodiment of the present invention can not only improve the hardness and wear resistance of the tungsten alloy coating, but also improve the weather resistance and corrosion resistance of the coating, thereby meeting the increasing development needs.

[0129] Finally, it should be noted that the above experimental examples are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned experimental examples, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned experimental examples, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the experimental examples of the present invention.

Claims

1. A method for preparing a rare earth element doped tungsten alloy coating, characterized in that: include: A mixing step of mixing a first powder containing a rare earth element and a second powder containing a tungsten element to obtain a mixed material; A die-casting step, wherein the mixed material is subjected to a die-casting process to obtain an ingot; A heat treatment step of heat treating the ingot to obtain a solid solution; A machining step of machining the solid solution to obtain a target material containing rare earth elements and tungsten elements; The deposition process is to perform deposition treatment on the target material so as to deposit the rare earth element and tungsten element in the target material on the surface of the workpiece to be processed, thereby obtaining a rare earth element-doped tungsten alloy coating.

2. The preparation method according to claim 1, characterized in that: In the mixing step, the mass ratio of the rare earth element to the tungsten element is 1:(50-80).

3. The preparation method according to claim 1, characterized in that: In the mixing process, the rare earth element includes at least one of lanthanum, cerium, europium, ytterbium, terbium and dysprosium, and the second powder further includes nickel.

4. The preparation method according to claim 3, characterized in that: In the mixing process, the ratio of the mass content of the tungsten element in the second powder to the mass content of the nickel element in the second powder is (6-9):

1.

5. The preparation method according to claim 1, characterized in that: In the mixing step, the particle size of the first powder is 10 μm to 30 μm, and the particle size of the second powder is 50 μm to 80 μm.

6. The preparation method according to claim 5, characterized in that: Before the mixing step, the method further comprises: In the grinding step, the first powder and the second powder are respectively ground to obtain the first powder with a particle size of 10 μm to 30 μm and the second powder with a particle size of 50 μm to 80 μm.

7. The preparation method according to claim 1, characterized in that: In the die-casting process, the temperature of the die-casting process is 800° C. to 1000° C., and the pressure of the die-casting process is 250 MPa to 300 MPa.

8. The preparation method according to claim 1, characterized in that: In the heat treatment process, the heat treatment temperature is 600° C. to 800° C., and the heat treatment time is 1 hour to 2 hours.

9. The preparation method according to claim 1, characterized in that: The deposition process includes a physical vapor deposition process.

10. The preparation method according to claim 9, characterized in that: The deposition process comprises: Inert gas was introduced at a flow rate of 30sccm-100sccm, bias voltage 100V-120V, duty cycle 55%-65%, vacuum degree 3×10 -4 Pa~2×10 -3 After Pa and temperature reach 350°C to 400°C, the power supply of the target material is started, and physical vapor deposition treatment is performed under the condition of a current of 100A to 150A to deposit the rare earth elements and tungsten elements in the target material on the surface of the workpiece to be processed to obtain a rare earth element-doped tungsten alloy coating.

Images