MAX / MXene Composite Reinforced Metal Matrix Composite Material and Preparation Method

Abstract

The present invention discloses a MAX / MXene composite reinforced metal matrix composite, which is composed of the following components by mass percentage: 0.5% - 4.5% MAX phase particles, 0.5% - 4.5% MXene phase particles, impurities not exceeding 0.1%, and the rest is a pure metal matrix, and the pure metal matrix is one of copper, aluminum, titanium, and molybdenum. The sum of the mass fractions of the above components is 100%. The present invention also discloses a preparation method of the MAX / MXene composite reinforced metal matrix composite. The MAX / MXene composite reinforced metal matrix composite of the present invention has a uniform and dense structure, fine grain size, and at the same time has high strength and high ductility.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal matrix composite materials, and specifically relates to a MAX / MXene composite reinforced metal matrix composite material. The present invention also relates to a preparation method of a MAX / MXene composite reinforced metal matrix composite material. Background Art

[0002] Particle-reinforced metal matrix composites are a new type of material that is composited by a certain process with metal as the matrix and particles as the reinforcement phase. At present, a series of metal matrix composites such as aluminum-based, magnesium-based, titanium-based, copper-based, and refractory metal-based have been developed. Through the optimized combination and structural design of the metal matrix and the reinforcement particles, a composite material that has the advantages of good plasticity, toughness, easy processing, and electrical and thermal conductivity of the metal matrix, and high hardness, high wear resistance, and good thermal stability of the reinforcement particles can be obtained. Therefore, metal matrix composites have been widely used in the military, automotive, aerospace, nuclear energy, and shipbuilding industries. The most common metal-based material particle reinforcement phases include hard ceramics such as oxides, carbides, and nitrides (Al2O3, ZrO2, SiC, TiC, Si3N4), while the traditional method of adding a single particle reinforcement phase to the metal matrix often leads to a significant decrease in plasticity and toughness while improving the strength of the material, making it difficult to achieve the design goal of synergistically improving the strength and toughness of the material.

[0003] In recent years, M, which combines many advantages of ceramics and metals, has n+1 AX n Phase has become a research hotspot. In the MAX phase, M represents transition metal elements, A represents main group elements, and X represents C or N elements. It is a layered ceramic with a rock salt-type structure, high modulus, low specific gravity, good electrical and thermal conductivity, machinability, thermal shock resistance, damage tolerance, thermal stability, creep resistance and oxidation resistance. In addition, since M and X are bonded by strong covalent bonds and ionic bonds, and M and A are bonded by weaker covalent bonds or metallic bonds, this makes it easy for the MAX phase to slip along the basal plane

[0001] . Therefore, compared with traditional ceramic particles, MAX phase particles have more advantages as the reinforcing phase of metal-based materials due to their unique microscale plastic deformation ability.

[0004] Mo2TiAlC2 is a new type of MAX phase ceramic, in which the atomic layers are stacked in the order of Mo-Ti-Mo-Al-Mo-Ti-Mo, with Mo atoms in the outermost layer and C atoms in the octahedral gap between the Mo and Ti atomic layers. Mo2TiAlC2 has a higher conductivity (4.26×106Ω) than Ti3AlC2 with the same MAX phase structure. -1 ·m -1) Young's modulus (329.4 GPa), hardness (7.3 GPa), fracture toughness (8.1 MPa·m 1 / 2 ) and a lower coefficient of thermal expansion (8.2×10 -6 K -1 ). In addition, Mo2TiC2 is a two-dimensional layered MXene phase material obtained by selectively etching the Al atomic layer of Mo2TiAlC2, and has a larger specific surface area than the precursor MAX phase. So far, adding Mo2TiAlC2 or Mo2TiC2 alone to molybdenum-based metals has effectively improved the mechanical properties of the materials. Among them, the strengthening effect of Mo2TiAlC2 is more obvious, and the toughening effect of Mo2TiC2 is more prominent. Therefore, developing a MAX / MXene composite reinforced metal matrix composite material to solve the technical problem of the mismatch between strength and toughness of metal matrix composites by means of the advantages of the two types of reinforcing phases in strengthening and toughening is of great significance for improving the performance of metal matrix composites and expanding their application range. Summary of the Invention

[0005] The object of the present invention is to provide a MAX / MXene composite reinforced metal matrix composite material with uniform and dense structure, fine grain size, and at the same time having high strength and high ductility.

[0006] Another object of the present invention is to provide a preparation method of a MAX / MXene composite reinforced metal matrix composite material.

[0007] The first technical solution adopted by the present invention is that the MAX / MXene composite reinforced metal matrix composite material is composed of the following components by mass percentage: 0.5%-4.5% MAX phase particles, 0.5%-4.5% MXene phase particles, no more than 0.1% impurities, and the rest is a pure metal matrix, and the sum of the mass fractions of the above components is 100%.

[0008] The characteristics of the first technical solution of the present invention also lie in that

[0009] the size of the MAX phase particles is 500 nm - 4.5 μm, the size of the MXene phase particles is 500 nm - 4 μm, and the MAX phase particles and the MXene phase particles are uniformly and dispersedly distributed in the pure metal matrix.

[0010] The pure metal matrix is one of copper, aluminum, titanium, and molybdenum.

[0011] The MAX phase particles are Mo2TiAlC2 particles, and the MXene phase particles are Mo2TiC2 particles.

[0012] In the titanium or molybdenum-based composite material, the mass percentage of MXene phase particles is 2-3 times that of MAX phase particles. In the copper or aluminum-based metal, the mass percentage of MAX phase particles is 2-3 times that of MXene phase particles.

[0013] The second technical solution adopted in the present invention is a method for preparing MAX / MXene composite reinforced metal matrix composite material, which is specifically implemented according to the following steps:

[0014] Step 1, batching: Weigh 94-98% of pure metal powder, 0.5%-4.5% of MAX phase powder, and 0.5%-4.5% of MXene phase powder by mass percentage for batching.

[0015] Step 2, mixing: First, ball-mill and mix the pure metal powder and MAX phase powder weighed in Step 1, and then ball-mill and mix the obtained mixed powder with MXene phase powder to obtain the final mixed powder.

[0016] Step 3, hot pressing and sintering: Screen the final mixed powder obtained in Step 2 through a 200-300 mesh Tyler sieve, then load it into a graphite mold for hot pressing and sintering, and then cool it in the furnace. After final demolding, the MAX / MXene composite reinforced metal matrix composite material is obtained.

[0017] The characteristics of the second technical solution of the present invention also lie in that

[0018] In Step 1, the pure metal powder is one of copper, aluminum, titanium, and molybdenum powders, and the purity of the pure metal powder is ≥99.9 wt%. The MAX phase powder is Mo2TiAlC2 powder, the particle size of the MAX phase powder is 500 nm - 4.5 μm, the MXene phase powder is Mo2TiC2 powder, the particle size of the MXene phase powder is 500 nm - 4 μm. When preparing the titanium or molybdenum-based composite material, the weighed MXene phase powder is 2-3 times the mass percentage of the MAX phase powder. When preparing the copper or aluminum-based composite material, the weighed MAX phase powder is 2-3 times the mass percentage of the MXene phase powder. The MXene phase powder is obtained by etching the Al atomic layer in the MAX phase powder with hydrofluoric acid.

[0019] In Step 2, the mixing is carried out in a planetary ball mill. The ball mill tank and grinding balls used are both made of agate. The ball-to-material ratio is (1-3):1, the rotation speed of the ball mill is 300 r / min - 400 r / min, the ball milling and mixing time is 6-10 h, and Ar gas is introduced during the ball milling process. The gas pressure in the ball mill tank is 0.3 MPa - 0.6 MPa.

[0020] In Step 3, the hot-pressing sintering temperatures of different metal matrix composites are different, but the hot-pressing sintering is carried out in a hot-pressing sintering furnace filled with Ar gas, and the hot-pressing sintering process is divided into two steps: First, the temperature is raised from room temperature to the temperature range of 1 / 2 - 3 / 4 of the sintering temperature at a heating rate of 5 - 10 °C / min, axially pressurized at 15 - 30 MPa, heat-insulated and pressure-maintained for 30 - 60 min, then the temperature is raised from the temperature range of 1 / 2 - 3 / 4 of the sintering temperature to the final sintering temperature at a heating rate of 5 - 10 °C / min, axially pressurized at 40 - 45 MPa, heat-insulated and pressure-maintained for 3 - 5 h, and then the temperature and pressure are reduced and cooled with the furnace.

[0021] The beneficial effects of the present invention are that the MAX / MXene phase particle composite-reinforced metal matrix (copper, aluminum, titanium, molybdenum) composites have a uniform and dense microstructure, small grain size, and the MAX phase and MXene phase particles are uniformly and dispersedly distributed in the pure metal matrix. Both the MAX phase and MXene phase particles have good wettability with the metal matrix and high interfacial bonding strength. In the copper and aluminum matrix composites, the mass fraction of the MAX phase is higher than that of the MXene phase, and the strengthening effect of the MAX phase can be exerted more. In the titanium and molybdenum matrix composites, the mass fraction of the MXene phase is higher than that of the MAX phase, and the toughening effect of the MXene phase can be exerted more, making the metal matrix composites have better strength-toughness matching than pure metals or single-particle reinforced metal matrix composites. The present invention solves the contradiction between strength and toughness in metal matrix composites to a certain extent and improves the comprehensive performance of such materials. The two-step ball milling and mixing process in the preparation method of the present invention can greatly improve the dispersion of the MAX phase and MXene phase in the metal matrix, and at the same time, the two-step hot-pressing sintering technology can appropriately reduce the sintering temperature of the composite material, avoiding phenomena such as decomposition of the reinforcing phase, element diffusion between the reinforcing phase and the metal matrix, and excessive grain growth of the metal matrix at high temperatures. The preparation process of the method of the present invention is simple, easy to operate, low in cost, has low requirements for equipment, and is easy to realize industrial production. Description of the Drawings

[0022] Figure 1 is the metallographic photo of the microstructure of the MAX / MXene composite-reinforced copper matrix composite and its preparation method of the present invention. Detailed Embodiments

[0023] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0024] The MAX / MXene composite-reinforced metal matrix composite of the present invention is composed of the following components by mass percentage: 0.5% - 4.5% MAX phase particles, 0.5% - 4.5% MXene phase particles, no more than 0.1% impurities, and the rest is a pure metal matrix, and the sum of the mass fractions of the above components is 100%.

[0025] The size of the MAX-phase particles is 500 nm - 4.5 μm, and the size of the MXene-phase particles is 500 nm - 4 μm. The MAX-phase particles and the MXene-phase particles are uniformly dispersed in the pure metal matrix.

[0026] The pure metal matrix is one of copper, aluminum, titanium, and molybdenum.

[0027] The MAX-phase particles are Mo2TiAlC2 particles, and the MXene-phase particles are Mo2TiC2 particles.

[0028] In the titanium- or molybdenum-based composite materials, the mass percentage of the MXene-phase particles is 2 - 3 times that of the MAX-phase particles. In the copper- or aluminum-based metals, the mass percentage of the MAX-phase particles is 2 - 3 times that of the MXene-phase particles.

[0029] A preparation method of the MAX / MXene composite reinforced metal matrix composite material is specifically implemented according to the following steps:

[0030] Step 1, batching: Weigh 94 - 98% of pure metal powder, 0.5% - 4.5% of MAX-phase powder, and 0.5% - 4.5% of MXene-phase powder by mass percentage for batching.

[0031] In Step 1, the pure metal powder is one of copper powder, aluminum powder, titanium powder, and molybdenum powder, and the purity of the pure metal powder is ≥99.9 wt%. The MAX-phase powder is Mo2TiAlC2 powder, the particle size of the MAX-phase powder is 500 nm - 4.5 μm, the MXene-phase powder is Mo2TiC2 powder, the particle size of the MXene-phase powder is 500 nm - 4 μm. When preparing the titanium- or molybdenum-based composite material, the weighed MXene-phase powder is 2 - 3 times the mass percentage of the MAX-phase powder. When preparing the copper- or aluminum-based composite material, the weighed MAX-phase powder is 2 - 3 times the mass percentage of the MXene-phase powder. The MXene-phase powder is obtained by etching the Al atomic layer in the MAX-phase powder with hydrofluoric acid.

[0032] Step 2, mixing: First, ball-mill and mix the pure metal powder weighed in Step 1 with the MAX-phase powder, and then ball-mill and mix the obtained mixed powder with the MXene-phase powder to obtain the final mixed powder.

[0033] In Step 2, the mixing is carried out in a planetary ball mill. The ball mill pot and the grinding balls used are both made of agate. The ball-to-material ratio is (1 - 3)∶1, the rotation speed of the ball mill is 300 r / min - 400 r / min, the ball-milling mixing time is 6 - 10 h, and Ar gas is introduced during the ball-milling process. The gas pressure in the ball mill pot is 0.3 MPa - 0.6 MPa.

[0034] Step 3, hot press sintering: The final mixed powder obtained in Step 2 is screened through a 200 - 300 mesh Tyler sieve, then loaded into a graphite mold for hot press sintering, and then cooled in the furnace. After final demolding, the MAX / MXene composite reinforced metal matrix composite material is obtained.

[0035] In Step 3, the hot press sintering temperatures of different metal matrix composite materials are different, but the hot press sintering is carried out in a hot press sintering furnace filled with Ar gas, and the hot press sintering process is divided into two steps: First, it is heated from room temperature to the temperature range of 1 / 2 - 3 / 4 of the sintering temperature at a heating rate of 5 - 10 °C / min, axially pressed at 15 - 30 MPa, and kept warm and pressurized for 30 - 60 min. Then, it is heated from the temperature range of 1 / 2 - 3 / 4 of the sintering temperature to the final sintering temperature at a heating rate of 5 - 10 °C / min, axially pressed at 40 - 45 MPa, and kept warm and pressurized for 3 - 5 h. After that, it is cooled and depressurized and cooled in the furnace.

[0036] Example 1

[0037] A preparation method of a MAX / MXene composite reinforced copper matrix composite material, comprising the following steps:

[0038] Step 1, batching, weighing 194 g of copper powder with a purity ≥ 99.9 wt%, 4 g of Mo2TiAlC2 powder with a particle size of 500 nm - 4.5 μm, and 2 g of Mo2TiC2 powder with a particle size of 500 nm - 4 μm.

[0039] Step 2, mixing, first putting the copper powder and Mo2TiAlC2 powder weighed in Step 1 into a planetary ball mill for ball milling and mixing for 6 h, and then ball milling and mixing the obtained mixed powder with Mo2TiC2 powder for 6 h to obtain the final mixed powder; the ball mill tank and grinding balls used during ball milling are both made of agate, the ball-to-material ratio is 1:1, the rotation speed of the ball mill is 300 r / min, and Ar gas atmosphere is introduced during the ball milling process, and the gas pressure in the ball mill tank is 0.3 MPa;

[0040] Step 3, the final mixed powder obtained in Step 2 is screened through a 200 - mesh Tyler sieve, then loaded into a graphite mold, and hot press sintering is carried out in a hot press sintering furnace filled with Ar gas. The hot press sintering process uses a two-step method for heating. First, it is heated from room temperature to 650 °C at a heating rate of 10 °C / min, axially pressed at 15 MPa, and kept warm and pressurized for 30 min. Then, it is heated from 650 °C to 900 °C at a heating rate of 10 °C / min, axially pressed at 45 MPa, and kept warm and pressurized for 4 h. After that, it is cooled and depressurized and cooled in the furnace. After final demolding, the MAX / MXene composite reinforced copper matrix composite material is obtained.

[0041] The copper-based composite material contains 2 wt% of Mo2TiAlC2 particles, 1 wt% of Mo2TiC2 particles and 97 wt% of copper matrix; the particle size of Mo2TiAlC2 is 500 nm - 4.5 μm, the particle size of Mo2TiC2 is 500 nm - 4 μm, and the grain size of copper is 3 - 8 μm; the Mo2TiAlC2 and Mo2TiC2 particles are uniformly and dispersedly distributed in the copper matrix.

[0042] The results of mechanical property tests show that the yield strength of the copper-based composite material is 210 MPa and the elongation is 31%.

[0043] Example 2

[0044] A preparation method of a MAX / MXene composite reinforced aluminum-based composite material comprises the following steps:

[0045] Step 1, batching, weighing 196 g of aluminum powder with a purity ≥ 99.9 wt%, 3 g of Mo2TiAlC2 powder with a particle size of 500 nm - 4.5 μm, and 1 g of Mo2TiC2 powder with a particle size of 500 nm - 4 μm.

[0046] Step 2, mixing, first putting the aluminum powder and Mo2TiAlC2 powder weighed in Step 1 into a planetary ball mill for ball milling and mixing for 8 h, and then ball milling and mixing the obtained mixed powder with Mo2TiC2 powder for 8 h to obtain the final mixed powder; the ball mill tank and grinding balls used during ball milling are both made of agate, the ball-to-material ratio is 2:1, the rotation speed of the ball mill is 350 r / min, and Ar gas is introduced during the ball milling process, and the gas pressure in the ball mill tank is 0.35 MPa;

[0047] Step 3, subjecting the final mixed powder obtained in Step 2 to screening treatment through a 200-mesh Tyler sieve and then loading it into a graphite mold, and performing hot pressing and sintering in a hot pressing sintering furnace filled with Ar gas. The hot pressing sintering process is carried out by heating in two steps. First, it is heated from room temperature to 430 °C at a heating rate of 5 °C / min, axially pressed at 20 MPa, kept warm and pressurized for 40 min, then heated from 430 °C to 575 °C at a heating rate of 5 °C / min, axially pressed at 42 MPa, kept warm and pressurized for 3.5 h, and then cooled by reducing the temperature and pressure and cooled in the furnace. After final demolding, the MAX / MXene composite reinforced aluminum-based composite material is obtained.

[0048] The aluminum-based composite material contains 1.5 wt% of Mo2TiAlC2 particles, 0.5 wt% of Mo2TiC2 particles and 98 wt% of aluminum matrix; the particle size of Mo2TiAlC2 is 500 nm - 4.5 μm, the particle size of Mo2TiC2 is 500 nm - 4 μm, and the grain size of aluminum is 5 - 10 μm; the Mo2TiAlC2 and Mo2TiC2 particles are uniformly and dispersedly distributed in the aluminum matrix.

[0049] The mechanical property test results show that the yield strength of the aluminum matrix composite material is 143 MPa and the elongation is 21.5%.

[0050] Example 3

[0051] A preparation method of a MAX / MXene composite reinforced copper matrix composite material, comprising the following steps:

[0052] Step 1, weighing materials, weighing 196 g of copper powder with a purity ≥ 99.9 wt%, 3 g of Mo2TiAlC2 powder with a particle size of 500 nm - 4.5 μm, and 1 g of Mo2TiC2 powder with a particle size of 500 nm - 4 μm.

[0053] Step 2, mixing materials, first putting the copper powder and Mo2TiAlC2 powder weighed in Step 1 into a planetary ball mill for ball milling and mixing for 7 h, and then ball milling and mixing the obtained mixed powder with Mo2TiC2 powder for 7 h to obtain the final mixed powder; the ball mill jar and grinding balls used during ball milling are both made of agate, the ball-to-material ratio is 1.5:1, the rotation speed of the ball mill is 400 r / min, and Ar gas is introduced during the ball milling process, and the gas pressure in the ball mill jar is 0.4 MPa;

[0054] Step 3, screening the final mixed powder obtained in Step 2 through a 200-mesh Tyler sieve, loading it into a graphite mold, and performing hot pressing sintering in a hot pressing sintering furnace filled with Ar gas. The hot pressing sintering process is carried out by heating up in two steps. First, it is heated from room temperature to 680 °C at a heating rate of 8 °C / min, axially pressed at 25 MPa, kept warm and pressurized for 35 min, then heated from 680 °C to 920 °C at a heating rate of 8 °C / min, axially pressed at 43 MPa, kept warm and pressurized for 5 h, and then cooled down and depressurized and cooled with the furnace. Finally, after demolding, the MAX / MXene composite reinforced copper matrix composite material is obtained.

[0055] The copper matrix composite material contains 1.5 wt% of Mo2TiAlC2 particles, 0.5 wt% of Mo2TiC2 particles and 98 wt% of copper matrix. The particle size of Mo2TiAlC2 is 500 nm - 4.5 μm, the particle size of Mo2TiC2 is 500 nm - 4 μm, and the grain size of copper is 3 - 8 μm; the Mo2TiAlC2 and Mo2TiC2 particles are uniformly and dispersedly distributed in the copper matrix.

[0056] The mechanical property test results show that the yield strength of the copper matrix composite material is 180 MPa and the elongation is 32%.

[0057] Example 4

[0058] A preparation method of a MAX / MXene composite reinforced aluminum matrix composite material, comprising the following steps:

[0059] Step 1, batching: Weigh 194 g of aluminum powder with a purity ≥ 99.9 wt%, 4 g of Mo2TiAlC2 powder with a particle size of 500 nm - 4.5 μm, and 2 g of Mo2TiC2 powder with a particle size of 500 nm - 4 μm.

[0060] Step 2, mixing: First, put the aluminum powder and Mo2TiAlC2 powder weighed in Step 1 into a planetary ball mill for ball milling and mixing for 9 h, and then ball mill and mix the obtained mixed powder with Mo2TiC2 powder for 9 h to obtain the final mixed powder; the ball mill jar and grinding balls used during ball milling are both made of agate, the ball-to-material ratio is 1.5:1, the rotation speed of the ball mill is 380 r / min, and Ar gas is introduced during the ball milling process, and the gas pressure in the ball mill jar is 0.5 MPa;

[0061] Step 3, put the final mixed powder obtained in Step 2 through a 200-mesh Tyler sieve screening treatment and then load it into a graphite mold, and conduct hot pressing sintering in a hot pressing sintering furnace filled with Ar gas. The hot pressing sintering process is carried out with a two-step heating method. First, heat from room temperature to 400 °C at a heating rate of 6 °C / min, apply an axial pressure of 26 MPa, keep the temperature and pressure constant for 30 min, then heat from 400 °C to 565 °C at a heating rate of 5 °C / min, apply an axial pressure of 40 MPa, keep the temperature and pressure constant for 4 h, and then cool down and reduce the pressure and cool with the furnace. Finally, after demolding, the MAX / MXene composite reinforced aluminum matrix composite material is obtained.

[0062] This aluminum matrix composite material contains 2 wt% of Mo2TiAlC2 particles, 1 wt% of Mo2TiC2 particles, and 97 wt% of an aluminum matrix; the particle size of Mo2TiAlC2 is 500 nm - 4.5 μm, the particle size of Mo2TiC2 is 500 nm - 4 μm, and the grain size of aluminum is 5 - 10 μm; the Mo2TiAlC2 and Mo2TiC2 particles are uniformly and dispersedly distributed in the aluminum matrix.

[0063] The mechanical property test results show that the yield strength of this aluminum matrix composite material is 151 MPa and the elongation is 29%.

[0064] Example 5

[0065] A preparation method of a MAX / MXene composite reinforced molybdenum matrix composite material, comprising the following steps:

[0066] Step 1, batching: Weigh 194 g of molybdenum powder with a purity ≥ 99.9 wt%, 1 g of Mo2TiAlC2 powder with a particle size of 500 nm - 4.5 μm, and 3 g of Mo2TiC2 powder with a particle size of 500 nm - 4 μm.

[0067] Step 2: Mixing. First, put the aluminum powder and Mo2TiAlC2 powder weighed in Step 1 into a planetary ball mill for ball milling and mixing for 10 h. Then, ball mill and mix the obtained mixed powder with Mo2TiC2 powder for 10 h to obtain the final mixed powder. The ball mill jar and grinding balls used during ball milling are both made of agate, the ball-to-material ratio is 3:1, the rotation speed of the ball mill is 330 r / min, and Ar gas is introduced during the ball milling process, and the gas pressure in the ball mill jar is 0.6 MPa.

[0068] Step 3: Screen the final mixed powder obtained in Step 2 through a 200-mesh Tyler sieve, then load it into a graphite mold, and conduct hot pressing and sintering in a hot pressing sintering furnace filled with Ar gas. The hot pressing sintering process is heated up in two steps. First, heat up from room temperature to 1200 °C at a heating rate of 10 °C / min, apply an axial pressure of 35 MPa, keep the temperature and pressure constant for 60 min. Then, heat up from 1200 °C to 1700 °C at a heating rate of 10 °C / min, apply an axial pressure of 40 MPa, keep the temperature and pressure constant for 3 h. After that, cool down, reduce the pressure and cool with the furnace. Finally, after demolding, the MAX / MXene composite reinforced molybdenum-based composite material is obtained.

[0069] This molybdenum-based composite material contains 0.5 wt% of Mo2TiAlC2 particles, 1.5 wt% of Mo2TiC2 particles and 98 wt% of molybdenum matrix. The particle size of Mo2TiAlC2 is 500 nm - 4.5 μm, the particle size of Mo2TiC2 is 500 nm - 4 μm, and the grain size of molybdenum is 10 - 14 μm. Mo2TiAlC2 and Mo2TiC2 particles are evenly and dispersedly distributed in the molybdenum matrix.

[0070] The mechanical property test results show that the yield strength of this molybdenum-based composite material is 350 MPa and the elongation is 43%.

Claims

1. Preparation method of MAX / MXene composite reinforced metal matrix composite material, characterized in that, The implementation is specifically carried out according to the following steps: Step 1, batching: Weigh 94 - 98% of pure metal powder, 0.5% - 4.5% of MAX phase powder, and 0.5% - 4.5% of MXene phase powder by mass percentage for batching; In the said Step 1, the pure metal powder is one of copper, aluminum, titanium, and molybdenum powders, and the purity of the pure metal powder is ≥99.9wt%; the MAX phase powder is Mo2TiAlC2 powder, the particle size of the MAX phase powder is 500nm - 4.5μm, the MXene phase powder is Mo2TiC2 powder, the particle size of the MXene phase powder is 500nm - 4μm. When preparing a titanium or molybdenum-based composite material, the weighed MXene phase powder is 2 - 3 times the mass percentage of the MAX phase powder. When preparing a copper or aluminum-based composite material, the weighed MAX phase powder is 2 - 3 times the mass percentage of the MXene phase powder. The MXene phase powder is obtained by etching the Al atomic layer in the MAX phase powder with hydrofluoric acid; Step 2, mixing: First, ball-mill and mix the pure metal powder and the MAX phase powder weighed in Step 1, and then ball-mill and mix the obtained mixed powder with the MXene phase powder to obtain the final mixed powder; In the said Step 2, the mixing is carried out in a planetary ball mill. The ball mill tank and the grinding balls used are both made of agate. The ball-to-material ratio is (1 - 3)∶1, the rotation speed of the ball mill is 300r / min - 400r / min, the ball-milling and mixing time is 6 - 10h, and Ar gas is introduced during the ball-milling process. The gas pressure in the ball mill tank is 0.3MPa - 0.6MPa; Step 3, hot pressing and sintering: The final mixed powder obtained in Step 2 is screened through a 200 - 300 mesh Tyler sieve and then loaded into a graphite mold for hot pressing and sintering, and then cooled with the furnace. After final demolding, the MAX / MXene composite reinforced metal matrix composite material is obtained; In the said Step 3, the hot pressing and sintering are all carried out in a hot pressing sintering furnace filled with Ar gas, and the hot pressing sintering process is divided into two steps: First, heat up from room temperature at a heating rate of 5 - 10℃ / min to the temperature range of 1 / 2 - 3 / 4 of the sintering temperature, apply an axial pressure of 15 - 30MPa, keep the temperature and pressure for 30 - 60min, then heat up from the temperature range of 1 / 2 - 3 / 4 of the sintering temperature at a heating rate of 5 - 10℃ / min to the final sintering temperature, apply an axial pressure of 40 - 45MPa, keep the temperature and pressure for 3 - 5h, and then cool down and reduce the pressure and cool with the furnace.

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