Cross-scale silicide reinforced high-entropy alloy high-temperature wear-resistant material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of high-entropy alloys, in particular to a cross-scale silicide reinforced high-entropy alloy high-temperature wear-resistant material as well as a preparation method and application thereof. The cross-scale silicide reinforced high-entropy alloy high-temperature wear-resistant material provided by the invention comprises the following elements in atomic percent: 40 to 45 percent of Co, 15 to 18 percent of Cr, 18 to 22 percent of Fe, 11 to 16 percent of W, 4 to 7 percent of Si, 0 to 1.5 percent of Nb and 0 to 1.5 percent of Ti. From the aspect of phase composition, the high-entropy alloy high-temperature wear-resistant material comprises an FCC (Fluid Catalytic Cracking) disordered solid solution and a silicide phase, and the silicide phase comprises a submicron silicide and a micron silicide. The high-entropy alloy provided by the invention has good wear resistance under a high-temperature condition, and is expected to be applied to the advanced science and technology fields of engine turbine blades, thermal protection materials, gas turbine bearings and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of high-entropy alloys, and particularly to a high-entropy alloy high-temperature wear-resistant material reinforced by cross-scale silicides, a preparation method thereof, and an application thereof. Background Art

[0002] High-temperature wear is one of the main reasons for the failure of mechanical moving parts. Especially in the fields of aviation and aerospace, moving parts such as gas foil bearings of aero-engines and bearings of hypersonic vehicle control devices face serious high-temperature wear. The high-temperature wear problem of related components has become the key to affecting the reliability, precision, and service life of the entire system. However, due to problems such as complex preparation processes, single types, low service temperatures, and mismatches between high-temperature wear resistance and strength and toughness of conventional metal wear-resistant materials, their applications in the field of high-temperature wear are greatly limited. Therefore, it is of great significance to explore and develop new high-performance high-temperature wear-resistant materials.

[0003] As a new type of metal alloy material, the unique feature of high-entropy alloys is that they are composed of multiple principal element elements. This shifts the element selection of high-entropy alloys from the corner regions of the phase diagram to the central region, providing infinite possibilities for the design of their types; the high-entropy effect promotes high-entropy alloys to form a stable solid-solution structure with a high solid solubility, enabling them to maintain a stable organizational structure under high-temperature working conditions; and by cleverly selecting the combination and ratio of elements, the physical and chemical properties of high-entropy alloys can be precisely adjusted, thereby endowing them with excellent high-temperature wear resistance. Research shows that compared with conventional wear-resistant materials such as die steel, bearing steel, and nickel-based superalloys, high-entropy alloys exhibit more excellent wear resistance. However, compared with cobalt-based high-temperature wear-resistant alloys such as Stellite-6 and Tribaloy-T400, there is still a certain gap between high-entropy alloys and them, which limits the applications of high-entropy alloys in cutting-edge technology fields such as engine turbine blades, thermal protection materials, and gas turbine bearings. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a high-entropy alloy high-temperature wear-resistant material reinforced by cross-scale silicides, a preparation method thereof, and an application thereof. The high-entropy alloy provided by the present invention has good wear resistance under high-temperature conditions and is expected to be applied to cutting-edge technology fields such as engine turbine blades, thermal protection materials, and gas turbine bearings.

[0005] To achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a high-temperature wear-resistant material of a high-entropy alloy reinforced by cross-scale silicides, which comprises the following elements in atomic percentages: Co 40-45%, Cr 15-18%, Fe 18-22%, W 11%-16%, Si 4-7%, Nb 0-1.5%, and Ti 0-1.5%.

[0007] In terms of phase composition, the high-temperature wear-resistant material of the high-entropy alloy comprises an FCC disordered solid solution and a silicide phase; the silicide phase comprises submicron silicides and micron-scale silicides.

[0008] Preferably, the phase size of the submicron silicides is 100-500 nm; the phase size of the micron-scale silicides is greater than 100 μm.

[0009] Preferably, in terms of mass percentage, the content of the FCC disordered solid solution in the high-temperature wear-resistant material of the high-entropy alloy is 57.71-63.66%, and the content of the silicide reinforcement phase is 36.34-42.29%.

[0010] Preferably, the wear rate of the high-temperature wear-resistant material of the high-entropy alloy at 600-900 °C is (0.23-8.03)×10 -6 mm 3 ·N -1 ·m -1 .

[0011] The present invention provides a preparation method of the high-temperature wear-resistant material of the high-entropy alloy described in the above scheme, which comprises the following steps: according to the element composition of the high-temperature wear-resistant material of the high-entropy alloy, Co, Fe, Cr, W, Si, Nb, and Ti are mixed and then subjected to arc melting in an argon atmosphere to obtain the high-temperature wear-resistant material of the high-entropy alloy.

[0012] Preferably, the pressure of the argon atmosphere is 0.02-0.08 MPa.

[0013] Preferably, the arc melting is carried out under the condition of electromagnetic stirring; the number of times of arc melting is 12-16 times.

[0014] Preferably, the current for each arc melting is independently 550-720 A, and the time for each arc melting is independently 2.0-4.5 min.

[0015] Preferably, the mixing is carried out in the order of Si, Co, Fe, Cr, Ti, Nb, and W in sequence.

[0016] The present invention provides an application of the high-temperature wear-resistant material of the high-entropy alloy described in the above scheme or the high-temperature wear-resistant material prepared by the preparation method described in the above scheme in a high-temperature working scenario.

[0017] The present invention provides a high-temperature wear-resistant material of a high-entropy alloy reinforced by cross-scale silicides. In atomic percentage, it includes the following elements: Co 40-45%, Cr 15-18%, Fe 18-22%, W 11%-16%, Si 4-7%, Nb 0-1.5%, and Ti 0-1.5%. In terms of phase composition, the high-temperature wear-resistant material of the high-entropy alloy includes an FCC disordered solid solution and a silicide phase. The silicide phase includes submicron-scale silicides and micron-scale silicides. By regulating the contents of W, Nb, and Ti in the high-entropy alloy, the present invention forms silicide phases (such as WSi2, NbSi2, TiSi, and TiSi2) based on in-situ reactions, and endows it with high high-temperature strength and high-temperature hardness by means of the solid solution strengthening effect, lattice distortion effect caused by elements W, Nb, and Ti with relatively large atomic radii, and the second-phase strengthening effect of the silicide phase. Moreover, the oxides WO3, Nb2O5, and TiO2 of W, Nb, and Ti have good high-temperature self-lubricating effects, which can significantly improve the tribological properties of the high-entropy alloy under high-temperature conditions. In addition, the silicide phase includes submicron-scale silicides and micron-scale silicides. The submicron-scale particles can fill the tiny pits on the surface of the matrix, improve the surface smoothness, and reduce micro-wear. The micron-scale particles can provide stronger support and resistance, and play a significant role in overall wear resistance. The randomly distributed particles can avoid stress concentration at a single position, prevent local wear from being too fast, and they can evenly disperse stress and improve the wear-resistant life of the material.

[0018] Compared with the conventional metal wear-resistant material Tribaloy-T400, the high-temperature wear-resistant material of the high-entropy alloy reinforced by cross-scale silicides provided by the present invention has more excellent wear resistance at 600-900 °C (it is reported in the prior art that the wear resistance of Tribaloy-T400 alloy at 600-900 °C is better than that of Stellite-6. Therefore, the wear resistance of the present invention is also better than that of Stellite-6). The wear rate of the high-temperature wear-resistant material of the high-entropy alloy provided by the present invention at 600-900 °C is (0.23-8.03)×10 -6 mm 3 ·N -1 ·m -1 。

[0019] The present invention provides a preparation method of the high-temperature wear-resistant material of the high-entropy alloy described in the above scheme. By means of the arc melting technology, a high-temperature wear-resistant material of a high-entropy alloy reinforced by cross-scale silicides with uniform composition can be prepared, without subsequent heat treatment processes, which is convenient to operate and has a simple process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 For Co described in Example 1 45 Fe 20 Cr 15 W15 XRD pattern of the high-entropy alloy high-temperature wear-resistant material reinforced by Si5 multi-scale silicides;

[0021] Figure 2 Co as described in Example 1 45 Fe 20 Cr 15 W 15 SEM images of the high-entropy alloy high-temperature wear-resistant material reinforced by Si5 multi-scale silicides at different magnifications;

[0022] Figure 3 Co as described in Example 2 42 Fe 20 Cr 18 W 13 XRD pattern of the high-entropy alloy high-temperature wear-resistant material reinforced by Si5Ti1Nb1 multi-scale silicides;

[0023] Figure 4 Co as described in Example 2 42 Fe 20 Cr 18 W 13 SEM images of the high-entropy alloy high-temperature wear-resistant material reinforced by Si5Ti1Nb1 multi-scale silicides at different magnifications. Detailed implementation manners

[0024] The present invention provides a high-entropy alloy high-temperature wear-resistant material reinforced by multi-scale silicides, which includes the following elements in atomic percentages: Co 40-45%, Cr 15-18%, Fe 18-22%, W 11%-16%, Si 4-7%, Nb 0-1.5% and Ti 0-1.5%.

[0025] In atomic percentages, the high-entropy alloy high-temperature wear-resistant material reinforced by multi-scale silicides provided by the present invention includes Co 40-45%, which can be 40%, 41%, 42%, 43%, 44% or 45% in specific embodiments. In the present invention, the role of Co is to promote the formation of a stable FCC phase, so that the high-entropy alloy high-temperature wear-resistant material reinforced by multi-scale silicides maintains high plasticity and toughness, and at the same time improves the high-temperature mechanical properties of the alloy.

[0026] In atomic percentages, the high-entropy alloy high-temperature wear-resistant material reinforced by multi-scale silicides provided by the present invention includes Fe 18-22%, which can be 18%, 19%, 20%, 21% or 22% in specific embodiments. In the present invention, the role of Fe is a stabilizer of the FCC phase, and its high-temperature oxide Fe3O4 has good high-temperature lubrication effect during high-temperature friction, and the increase of Fe content helps to reduce the use cost of the material.

[0027] In atomic percentage, the high-temperature wear-resistant material of the cross-scale silicide-reinforced high-entropy alloy provided by the present invention includes 15-18% of Cr, which can be 15%, 16%, 17% or 18% in specific embodiments. In the present invention, the high-temperature oxide Cr2O3 of Cr helps to improve the oxidation resistance and has good high-temperature lubrication during high-temperature friction.

[0028] In atomic percentage, the high-temperature wear-resistant material of the cross-scale silicide-reinforced high-entropy alloy provided by the present invention includes 11-16% of W, which can be 11%, 12%, 13%, 14%, 15% or 16% in specific embodiments. In the present invention, the role of W is to form in-situ WSi2 with Si to enhance the high-temperature strength and high-temperature wear resistance of the alloy; and by virtue of the relatively large atomic radius of W, lattice distortion is induced to enhance the high-temperature strength, hardness and wear resistance of the high-entropy alloy; at the same time, the oxidation product WO3 of W during the friction process has good high-temperature self-lubrication effect, which helps to improve the high-temperature wear resistance of the alloy. When W is omitted, the wear resistance of the CoFeCr ternary medium-entropy alloy is poor.

[0029] In atomic percentage, the high-temperature wear-resistant material of the cross-scale silicide-reinforced high-entropy alloy provided by the present invention includes 4-7% of Si, which can be 4%, 5%, 6% or 7% in specific embodiments. In the present invention, the role of Si is to combine with W, Nb and Ti to form silicides, enhancing the high-temperature strength and hardness of the high-entropy alloy. At the same time, the oxide SiO2 formed by Si at high temperature also helps to improve the high-temperature oxidation resistance of the alloy.

[0030] In atomic percentage, the high-temperature wear-resistant material of the cross-scale silicide-reinforced high-entropy alloy provided by the present invention includes 0-1.5% of Nb, which can be 0%, 0.5%, 1% or 1.5% in specific embodiments. In the present invention, the role of Nb is to enhance the high-temperature strength and hardness of the high-entropy alloy through solid solution strengthening and inducing lattice distortion; and the formation of high-strength and high-wear-resistant NbSi2 also helps to improve the high-temperature wear resistance of the alloy.

[0031] In atomic percentage, the high-temperature wear-resistant material of the cross-scale silicide-reinforced high-entropy alloy provided by the present invention includes 0-1.5% of Ti, which can be 0%, 0.5%, 1% or 1.5% in specific embodiments. In the present invention, the role of Ti is to enhance the high-temperature strength and hardness of the high-entropy alloy through solid solution strengthening and inducing lattice distortion; and the formation of high-strength and high-wear-resistant TiSi and TiSi2 also helps to improve the high-temperature wear resistance of the alloy.

[0032] In terms of phase composition, the high-temperature wear-resistant material of the high-entropy alloy includes a FCC disordered solid solution and a silicide phase; the silicide phase includes submicron-scale silicides and micron-scale silicides.

[0033] In the present invention, the phase size of the submicron silicide is preferably 100 - 500 nm; the phase size of the micron-scale silicide is preferably greater than 100 μm. In the present invention, the submicron particles can fill the tiny pits on the surface of the matrix, improve the surface smoothness, and reduce the micro wear; the micron-scale particles can provide stronger support and resistance, and play a significant role in the overall wear resistance; the randomly distributed particles can avoid stress concentration at a single position, prevent local wear from being too fast, and they can disperse the stress evenly, improving the wear-resistant life of the material.

[0034] In the present invention, by mass percentage, the content of the FCC disordered solid solution in the high-entropy alloy high-temperature wear-resistant material is preferably 57.71 - 63.66%, and the content of the silicide reinforcing phase is preferably 36.34 - 42.29%. In a specific embodiment, the content of the FCC disordered solid solution in the high-entropy alloy high-temperature wear-resistant material can be 58%, 59%, 60%, 61%, 62% or 63%, and the content of the silicide reinforcing phase can be 37%, 38%, 39%, 40%, 41% or 42%.

[0035] The present invention provides a preparation method of the high-entropy alloy high-temperature wear-resistant material described in the above solution, including the following steps: According to the element composition of the high-entropy alloy high-temperature wear-resistant material, Co, Fe, Cr, W, Si, Nb and Ti are mixed and then subjected to arc melting in an argon atmosphere to obtain the high-entropy alloy high-temperature wear-resistant material.

[0036] In the present invention, unless otherwise specified, all the preparation raw materials are commercially available products well-known to those skilled in the art.

[0037] In the present invention, the purity of Co, Fe, Cr, W, Si, Nb and Ti is preferably ≥99.9 wt.%, more preferably ≥99.95 wt.%; Co, Fe, Cr, W, Nb and Ti are independently preferably in the form of blocks, particles or powders, more preferably columnar particles with a diameter of Φ8×10 mm or columnar particles with a diameter of Φ3×4 mm; Si is preferably in the form of particles or powders, more preferably flaky particles with a particle size of not less than 5 mm.

[0038] In the present invention, the mixing is preferably carried out in the order of Si, Co, Fe, Cr, Ti, Nb and W in sequence. The present invention preferably adds each raw material to a water-cooled copper crucible. In the present invention, because the density of Si is the lowest, the Si element is pre-placed at the bottom layer of the water-cooled copper crucible to prevent part of the Si from being blown away by the arc during the arc melting process, so as to reduce the material loss and make the alloy composition consistent with the original ratio.

[0039] Before the arc melting, the present invention preferably evacuates the vacuum degree of the furnace chamber of the arc melting furnace to 10 -3Below Pa, and then filled with high-purity argon with a purity of ≥99.999% to keep the pressure in the furnace chamber at 0.02 - 0.08 MPa; more preferably, the vacuum degree of the arc melting furnace chamber is pumped to 5×10 -4 Below Pa, and then filled with high-purity argon with a purity of ≥99.999% to keep the pressure in the furnace chamber at 0.06 - 0.07 MPa.

[0040] In the present invention, the arc melting is preferably carried out under the condition of electromagnetic stirring. The number of times of arc melting is preferably 12 - 16 times, more preferably 14 - 15 times; the melting current for each arc melting is independently preferably 550 - 720 A, more preferably 650 - 700 A; the time for each arc melting is independently preferably 2.0 - 4.5 min, more preferably 3.5 - 4.0 min.

[0041] The preparation method of the present invention is simple, without subsequent heat treatment process and is convenient to operate. In addition, the present invention reduces the consumption of Co strategic metal and has great industrial potential.

[0042] The present invention provides the application of the high-entropy alloy high-temperature wear-resistant material described in the above scheme or the high-entropy alloy high-temperature wear-resistant material prepared by the preparation method described in the above scheme in high-temperature working scenarios. In the present invention, the high-temperature working scenario can specifically be used as an engine turbine blade, a thermal protection material or a gas turbine bearing.

[0043] The following combines examples to detail the cross-scale silicide-reinforced high-entropy alloy high-temperature wear-resistant material provided by the present invention, its preparation method and application, but they cannot be understood as limiting the protection scope of the present invention.

[0044] Example 1

[0045] The composition of the cross-scale silicide-reinforced high-entropy alloy high-temperature wear-resistant material is by atomic percentage: Co 45%, Fe 20%, Cr 15%, W 15% and Si 5%;

[0046] Preparation process:

[0047] Use an electronic analytical balance with a precision of 0.0001 g to weigh Co, Fe, Cr and W metal single-element particles with a purity of 99.95 wt% and a size of Φ3×5 mm and flaky Si particles respectively;

[0048] In the order of Si→Co→Fe→Cr→W, 2.2649 g of Si, 42.7270 g of Co, 17.9903 g of Fe, 12.5739 g of Cr and 44.4438 g of W are pre-placed in a water-cooled copper crucible in sequence, and the vacuum degree of the arc melting furnace chamber is pumped to 5×10 -4Pa, and then filled with high-purity argon with a purity ≥ 99.999% to keep the pressure in the furnace at 0.06 MPa. Arc melting was carried out 16 times with a current of 700 A, and the melting time for each time was 4.0 min. Electromagnetic stirring technology was used to ensure the uniformity of the alloy composition, and the Co was obtained. 45 Fe 20 Cr 15 W 15 A high-temperature wear-resistant material of high-entropy alloy reinforced by Si5 multi-scale silicides.

[0049] Figure 1 For the Co 45 Fe 20 Cr 15 W 15 XRD pattern of the high-temperature wear-resistant material of high-entropy alloy reinforced by Si5 multi-scale silicides, from Figure 1 It can be seen that the Co 45 Fe 20 Cr 15 W 15 The high-temperature wear-resistant material of high-entropy alloy reinforced by Si5 multi-scale silicides is composed of FCC disordered solid solution and silicide phase;

[0050] Figure 2 For the Co 45 Fe 20 Cr 15 W 15 SEM images of the high-temperature wear-resistant material of high-entropy alloy reinforced by Si5 multi-scale silicides at different magnifications, from Figure 2 It can be seen that the size of the smaller silicide phase is 200 - 500 nm, while the size of the larger silicide is greater than 100 μm, and the scale of the silicide reinforcement phase spans the sub-micron level and the micron level.

[0051] The Co 45 Fe 20 Cr 15 W 15 The wear rates of the high-temperature wear-resistant material of high-entropy alloy reinforced by Si5 multi-scale silicides and Tribaloy-T400 alloy at 600 - 900 °C are shown in Table 1, where the wear rate is calculated from the measured wear volume. During the wear rate test, the load was 10 N, the linear velocity was 0.2 m / s, and the counter ball was Al2O3.

[0052] Table 1 Co 45 Fe 20 Cr 15 W 15 Wear rates of the high-temperature wear-resistant material of high-entropy alloy reinforced by Si5 multi-scale silicides and Tribaloy-T400 alloy at 600 - 900 °C

[0053]

[0054] As can be seen from Table 1, at 600 °C, 800 °C and 900 °C, Co 45 Fe 20 Cr 15 W 15 The wear rates of the high-entropy alloy high-temperature wear-resistant material reinforced by Si5 multi-scale silicides are 7.34×10 -6 mm 3 ·N -1 ·m -1 、0.23×10 -6 mm 3 ·N -1 ·m -1 and 0.36×10 -6 mm 3 ·N -1 ·m -1 , respectively. Its wear resistance is 1.11 times, 3.78 times and 3.55 times higher than that of industrial-grade Tribaloy-T400 alloy. This shows that the Co 45 Fe 20 Cr 15 W 15 High-entropy alloy high-temperature wear-resistant material reinforced by Si5 multi-scale silicides has better wear resistance than industrial-grade Tribaloy-T400 alloy at 600-900 °C. In addition, this high-entropy alloy high-temperature wear-resistant material reinforced by multi-scale silicides can be directly prepared by arc melting technology without thermo-mechanical treatment. The preparation process is simple and conducive to industrial promotion.

[0055] Example 2

[0056] The composition of the high-entropy alloy high-temperature wear-resistant material reinforced by multi-scale silicides is as follows in atomic percentage: Co 42%, Fe 20%, Cr 18%, W 13%, Si 5%, Ti 1% and Nb 1%;

[0057] The preparation process is as follows:

[0058] Use an electronic analytical balance with a precision of 0.0001 g to weigh the metal single-element particles of Co, Fe, Cr, W, Ti and Nb with a purity of 99.95 wt% and a size of Φ3×5 mm, and flaky Si particles respectively;

[0059] In the order of Si→Co→Fe→Cr→Ti→Nb→W, place 2.3428 g of Si, 41.2500 g of Co, 18.6090 g of Fe, 15.6076 g of Cr, 0.7987 g of Ti, 1.5491 g of Nb and 39.8427 g of W into a water-cooled copper crucible in turn, and evacuate the vacuum degree of the arc melting furnace hearth to 5×10-4 Pa, and then filled with high-purity argon with a purity of ≥99.999% to keep the pressure in the furnace at 0.06 MPa. Arc melting was carried out 16 times with a current of 682 A, and the melting time for each time was 4.0 min. Electromagnetic stirring technology was used to ensure the uniformity of the alloy composition, and the Co was obtained. 42 Fe 20 Cr 18 W 13 A high-temperature wear-resistant material of high-entropy alloy reinforced by Si5Ti1Nb1 multi-scale silicides.

[0060] Figure 3 For the Co 42 Fe 20 Cr 18 W 13 XRD pattern of the high-temperature wear-resistant material of high-entropy alloy reinforced by Si5Ti1Nb1 multi-scale silicides, from Figure 3 It can be seen that the Co 42 Fe 20 Cr 18 W 13 The high-temperature wear-resistant material of high-entropy alloy reinforced by Si5Ti1Nb1 multi-scale silicides is composed of FCC disordered solid solution and silicide phase.

[0061] Figure 4 For the Co 42 Fe 20 Cr 18 W 13 SEM images of the high-temperature wear-resistant material of high-entropy alloy reinforced by Si5Ti1Nb1 multi-scale silicides at different magnifications, from Figure 4 It can be seen that the size of the smaller silicide phase is 100 - 500 nm, while the largest scale is greater than 100 μm, indicating that this material is a high-temperature wear-resistant material of high-entropy alloy reinforced by multi-scale nano-micron silicides.

[0062] The Co 42 Fe 20 Cr 18 W 13 The wear rates of the high-temperature wear-resistant material of high-entropy alloy reinforced by Si5Ti1Nb1 multi-scale silicides and Tribaloy-T400 alloy at 600 - 900 °C are shown in Table 2, where the wear rate is calculated from the measured wear volume. During the wear rate test, the load was 10 N, the linear velocity was 0.2 m / s, and the counter ball was Al2O3.

[0063] Table 2 Co 42 Fe 20 Cr 18 W 13High-temperature wear-resistant material of high-entropy alloy enhanced by Si5Ti1Nb1 multi-scale silicide and wear rate of Tribaloy-T400 alloy at 600 - 900 °C

[0064]

[0065] As can be seen from Table 2, at 600 °C, 800 °C and 900 °C, Co 42 Fe 20 Cr 18 W 13 The wear rates of the high-temperature wear-resistant material of high-entropy alloy enhanced by Si5Ti1Nb1 multi-scale silicide are 8.03×10 -6 mm 3 ·N -1 ·m -1 , 0.67×10 -6 mm 3 ·N -1 ·m -1 and 0.94×10 -6 mm 3 ·N -1 ·m -1 , respectively. Its wear resistance is improved by 1.96%, 22.99% and 26.56% compared with Tribaloy-T400 alloy. This shows that this Co 42 Fe 20 Cr 18 W 13 The high-temperature wear-resistant material of high-entropy alloy enhanced by Si5Ti1Nb1 multi-scale silicide has better wear resistance than Tribaloy-T400 alloy at 600 - 900 °C and is suitable for solving the high-temperature wear problem of moving parts under high-temperature working conditions.

[0066] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A cross-scale silicide-enhanced high-entropy alloy high-temperature wear-resistant material, comprising the following elements, in atomic percentage: Co 40-45%, Cr 15-18%, Fe 18-22%, W 11%-16%, Si 4-7%, Nb0-1.5% and Ti 0-1.5%; From the perspective of phase composition, the high entropy alloy high temperature wear-resistant material includes an FCC disordered solid solution and a silicide phase; the silicide phase includes submicron silicide and micron silicide.

2. The high-entropy alloy high-temperature wear-resistant material according to claim 1, characterized in that: The phase size of the submicron-scale silicide is 100-500 nm; the phase size of the micron-scale silicide is greater than 100 μm.

3. The high-entropy alloy high-temperature wear-resistant material according to claim 1, characterized in that: Calculated by mass percentage, the content of FCC disordered solid solution in the high-entropy alloy high-temperature wear-resistant material is 57.71-63.66%, and the content of silicide reinforcement phase is 36.34-42.29%.

4. The high-entropy alloy high-temperature wear-resistant material according to claim 1, characterized in that: The wear rate of the high-entropy alloy high-temperature wear-resistant material at 600-900°C is (0.23-8.03)×10 -6 mm 3 ·N -1 ·m -1 .

5. The method for preparing the high-entropy alloy high-temperature wear-resistant material according to any one of claims 1 to 4, characterized in that: The following steps are involved: According to the element composition of the high entropy alloy high temperature wear-resistant material, Co, Fe, Cr, W, Si, Nb and Ti are mixed and arc-melted in an argon atmosphere to obtain the high entropy alloy high temperature wear-resistant material.

6. The preparation method according to claim 5, characterized in that: The pressure of the argon atmosphere is 0.02-0.08 MPa.

7. The preparation method according to claim 5, characterized in that: The arc melting is carried out under the condition of electromagnetic stirring; the number of times of the arc melting is 12 to 16 times.

8. The preparation method according to claim 7, characterized in that: The current of each arc melting is independently 550 to 720 A, and the time of each arc melting is independently 2.0 to 4.5 min.

9. The preparation method according to claim 7, characterized in that: The mixing is performed by adding Si, Co, Fe, Cr, Ti, Nb and W in this order.

10. Use of the high-entropy alloy high-temperature wear-resistant material according to any one of claims 1 to 4 or the high-entropy alloy high-temperature wear-resistant material prepared by the preparation method according to any one of claims 5 to 9 in high-temperature working scenarios.

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