Preparation method of silicon carbide fiber reinforced titanium-based composite material

Abstract

The invention provides a preparation method of a silicon carbide fiber reinforced titanium-based composite material, and relates to the technical field of powder metallurgy, the method comprises the following steps: mixing an alkali metal chloride salt, a titanium-containing inorganic salt and an organic solvent to obtain a mixed solution; stirring the mixed solution, and performing reduced pressure distillation to obtain titanium-containing mixed salt powder; mixing the titanium-containing mixed salt powder with silicon carbide fibers, and carrying out heating treatment to obtain MAX phase coated silicon carbide fibers; the titanium-containing mixed salt powder can be in a molten state through the heating treatment temperature; mixing the MAX-phase coated silicon carbide fibers with titanium alloy powder, and performing ball milling treatment to obtain mixed powder; and carrying out compression molding on the mixed powder, and sintering to obtain the silicon carbide fiber reinforced titanium-based composite material. By means of the method, the strength and toughness of the silicon carbide fiber reinforced titanium-based composite material obtained through the powder metallurgy process can be synchronously improved.

Description

Technical Field

[0001] This invention relates to the field of powder metallurgy technology, and more specifically, to a method for preparing silicon carbide fiber-reinforced titanium-based composite materials. Background Art

[0002] Titanium alloys, with their low density, high specific strength, corrosion resistance, and good biocompatibility, are widely used in aerospace and marine applications. However, the rapid development of these fields has placed higher demands on structural materials for lightweight, high strength, and high-temperature resistance. Currently, some properties of titanium alloys, such as heat resistance, oxidation resistance, and wear resistance, are insufficient to meet the more demanding application conditions required for high-performance structural materials in the future. Titanium-based composite materials, prepared by introducing ceramic reinforcements into titanium alloys, combine the low density, high toughness, and machinability of the titanium alloy matrix with the high strength, heat resistance, and wear resistance of the ceramic reinforcement. This fully leverages the characteristics of both the metal matrix and the ceramic reinforcement, demonstrating significant application potential in aerospace and other fields.

[0003] Currently, in-situ self-generated TiC particles and TiB whiskers are the two most common ceramic reinforcements used to strengthen titanium alloys. Compared to high-density TiC (4.9 g / cm³), TiB has a higher density. 3 ) and TiB (4.5 g / cm 3 Ceramic reinforcement, low-density silicon carbide (3.2 g / cm³) 3 This is more conducive to weight reduction and structural design of lightweight titanium-based composite components. Furthermore, silicon carbide fiber preparation technology is more mature and its performance is superior, better meeting the requirements of the aerospace field for materials with low density, high specific strength, high specific stiffness, and higher operating temperatures. Therefore, silicon carbide fiber reinforced titanium-based composites will become the preferred high-temperature structural materials for aerospace in the future.

[0004] However, the current powder metallurgy process for preparing silicon carbide fiber reinforced titanium matrix composites mainly involves ball milling and high-temperature sintering. During high-temperature preparation and high-temperature service, silicon carbide fibers are prone to severe interfacial reactions with the titanium alloy matrix, resulting in the formation of brittle titanium-silicon interfacial products. These brittle interfacial products not only reduce the interfacial bonding strength but also destroy the integrity of the silicon carbide fiber structure, resulting in low strength and toughness of silicon carbide fiber reinforced titanium matrix composites. Summary of the Invention

[0005] The problem addressed by this invention is: how to further improve the strength and toughness of silicon carbide fiber reinforced titanium matrix composites.

[0006] To address the above problems, this invention provides a method for preparing silicon carbide fiber-reinforced titanium-based composite materials, comprising: Step S1: Mix the alkali metal chloride salt, the titanium-containing inorganic salt, and the organic solvent to obtain a mixed solution; Step S2: After stirring the mixed solution, perform vacuum distillation to obtain titanium-containing mixed salt powder; Step S3: After mixing the titanium-containing mixed salt powder with silicon carbide fibers, heat treatment is performed to obtain silicon carbide fibers coated with the MAX phase; wherein, the temperature of the heat treatment is set to allow the titanium-containing mixed salt powder to be in a molten state; Step S4: Mix the silicon carbide fiber coated with the MAX phase with the titanium alloy powder, and then perform ball milling to obtain the mixed powder. Step S5: After molding the mixed powder, sinter it to obtain silicon carbide fiber reinforced titanium matrix composite material.

[0007] Optionally, in step S1, the titanium-containing inorganic salt includes at least one of titanium sulfate, titanium orthosulfate, and titanium oxysulfate.

[0008] Optionally, in step S1, the alkali metal chloride salt includes at least one of potassium chloride and sodium chloride.

[0009] Optionally, in step S1, the mass ratio of the titanium-containing inorganic salt to the alkali metal chloride salt is (1 to 2): 1, and the mass fraction of the mixed salt composed of the alkali metal chloride salt and the titanium-containing inorganic salt in the mixed solution is 30% to 40%.

[0010] Optionally, in step S2, the stirring speed is 50 rpm to 100 rpm and the time is 1 h to 3 h; the vacuum distillation temperature is 50 °C to 70 °C and the time is 10 min to 30 min.

[0011] Optionally, in step S3, the mass ratio of the titanium-containing mixed salt powder to the silicon carbide fiber is 10:(2 to 3).

[0012] Optionally, in step S3, the temperature of the heat treatment is 900°C to 1100°C, and the time is 30 min to 60 min.

[0013] Optionally, in step S4, the mass ratio of the silicon carbide fiber coated with the MAX phase to the titanium alloy powder is (1 to 5): 10; the ball milling speed is 50 rpm to 100 rpm, and the time is 5 h to 10 h.

[0014] Optionally, in step S5, the pressure of the compression molding is 10 MPa to 30 MPa.

[0015] Optionally, in step S5, the sintering temperature is 1200°C to 1300°C, the time is 60 min to 120 min, and the pressure is 30 MPa to 50 MPa.

[0016] Compared with related technologies, this invention first prepares a titanium-containing mixed salt. During the subsequent heat treatment, on the one hand, the titanium-containing mixed salt provides a titanium source for the in-situ reaction, ensuring the formation of a MAX phase metal-ceramic interface with silicon carbide fibers. On the other hand, the molten environment provided by the titanium-containing mixed salt at high temperature facilitates the migration of titanium ions, effectively increasing the rate of the in-situ reaction and ensuring the purity and reactivity of the MAX phase. This allows for the uniform formation of the MAX phase on the surface of the silicon carbide fibers, resulting in MAX phase-coated silicon carbide fibers. Then, the MAX phase-coated silicon carbide fibers and titanium alloy powder are ball-milled, molded, and sintered to obtain a silicon carbide fiber-reinforced titanium matrix composite material with the MAX phase as the interface layer. The MAX phase interface layer can suppress undesirable interfacial reactions between the silicon carbide fibers and the titanium alloy matrix, improve the wettability of the titanium alloy to the silicon carbide fibers, significantly improve the interfacial bonding strength, avoid interfacial thermal stress concentration, and fully utilize the reinforcing effect of the silicon carbide fibers, resulting in a silicon carbide fiber-reinforced titanium matrix composite material with high strength. Meanwhile, due to the multiple energy dissipation behaviors of the MAX phase, such as interlayer debonding and torsional deformation, resulting from its unique nanosheet structure, it can accelerate the absorption and dissipation of stress waves at the interface. This also facilitates the debonding, pull-out, and deflection of silicon carbide fibers, as well as the plastic deformation of the titanium alloy matrix. This synergistic effect further dissipates the applied load, significantly improving the toughness of silicon carbide fiber-reinforced titanium matrix composites. In summary, the method of this invention can simultaneously improve the strength and toughness of silicon carbide fiber-reinforced titanium matrix composites obtained through powder metallurgy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the preparation method of silicon carbide fiber reinforced titanium matrix composite material in an embodiment of the present invention; Figure 2 The XRD pattern of the MAX phase-coated silicon carbide fiber prepared in Example 1; Figure 3 This is a scanning electron microscope image of the silicon carbide fiber coated with the MAX phase obtained in Example 1. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0021] like Figure 1 As shown in the embodiment of the present invention, a method for preparing a silicon carbide fiber reinforced titanium matrix composite material includes: Step S1: Mix the alkali metal chloride salt, the titanium-containing inorganic salt, and the organic solvent to obtain a mixed solution; Step S2: After stirring the mixed solution, perform vacuum distillation to obtain titanium-containing mixed salt powder; Step S3: After mixing the titanium-containing mixed salt powder with silicon carbide fibers, heat treatment is performed to obtain silicon carbide fibers coated with the MAX phase; wherein, the temperature of the heat treatment is set to allow the titanium-containing mixed salt powder to be in a molten state; Step S4: Mix the silicon carbide fiber coated with the MAX phase with the titanium alloy powder, and then perform ball milling to obtain the mixed powder. Step S5: After molding the mixed powder, sinter it to obtain silicon carbide fiber reinforced titanium matrix composite material.

[0022] This invention first prepares a titanium-containing mixed salt. During subsequent heat treatment, the titanium-containing mixed salt provides a titanium source for the in-situ reaction, ensuring the formation of a MAX phase metal-ceramic interface with silicon carbide fibers. Furthermore, the molten environment provided by the titanium-containing mixed salt at high temperature facilitates the migration of titanium ions, effectively increasing the rate of the in-situ reaction and ensuring the purity and reactivity of the MAX phase. This allows for the uniform formation of the MAX phase on the surface of the silicon carbide fibers, resulting in MAX phase-coated silicon carbide fibers. The MAX phase-coated silicon carbide fibers are then ball-milled, molded, and sintered with titanium alloy powder to obtain a silicon carbide fiber-reinforced titanium matrix composite material with the MAX phase as the interface layer. The MAX phase interface layer can suppress undesirable interfacial reactions between the silicon carbide fibers and the titanium alloy matrix, improve the wettability of the titanium alloy to the silicon carbide fibers, significantly increase the interfacial bonding strength, avoid interfacial thermal stress concentration, and fully utilize the reinforcing effect of the silicon carbide fibers, resulting in a silicon carbide fiber-reinforced titanium matrix composite material with high strength. Meanwhile, due to the multiple energy dissipation behaviors of the MAX phase, such as interlayer debonding and torsional deformation, resulting from its unique nanosheet structure, it can accelerate the absorption and dissipation of stress waves at the interface. This also facilitates the debonding, pull-out, and deflection of silicon carbide fibers, as well as the plastic deformation of the titanium alloy matrix. This synergistic effect further dissipates the applied load, significantly improving the toughness of silicon carbide fiber-reinforced titanium matrix composites. In summary, the method of this invention can simultaneously improve the strength and toughness of silicon carbide fiber-reinforced titanium matrix composites obtained through powder metallurgy.

[0023] In some embodiments of the present invention, in step S1, the titanium-containing inorganic salt includes at least one of titanium sulfate, titanium orthosulfate, and titanium oxysulfate.

[0024] In some embodiments of the present invention, in step S1, the organic solvent is at least one of n-butyl ether and ethanol.

[0025] In some embodiments of the present invention, in step S1, the alkali metal chloride salt includes at least one of potassium chloride and sodium chloride.

[0026] In some embodiments of the present invention, in step S1, the mass ratio of the titanium-containing inorganic salt to the alkali metal chloride salt is (1 to 2):1, and the mass fraction of the mixed salt composed of the alkali metal chloride salt and the titanium-containing inorganic salt in the mixed solution is 30% to 40%.

[0027] In some embodiments of the present invention, in step S2, the stirring speed is 50 rpm to 100 rpm and the time is 1 h to 3 h; the vacuum distillation temperature is 50 °C to 70 °C and the time is 10 min to 30 min.

[0028] In some embodiments of the present invention, in step S3, the mass ratio of the titanium-containing mixed salt powder to the silicon carbide fiber is 10:(2 to 3).

[0029] In some embodiments of the present invention, in step S3, the length of the silicon carbide fiber is 1 mm to 50 mm and the diameter is 50 μm to 200 μm.

[0030] In some embodiments of the present invention, in step S3, the temperature of the heat treatment is 900°C to 1100°C, and the time is 30 min to 60 min.

[0031] In some embodiments of the present invention, in step S4, the mass ratio of the MAX phase-coated silicon carbide fiber to the titanium alloy powder is (1 to 5):10; the ball milling speed is 50 rpm to 100 rpm, the time is 5 h to 10 h, and the ball-to-material mass ratio during the ball milling process is (5 to 10):1. It should be noted that, in the present invention, the ball-to-material mass ratio during the ball milling process refers to the ratio of the mass of the balls used in the ball milling process to the mass of the material. The mass of the material is the total mass of the MAX phase-coated silicon carbide fiber and the titanium alloy powder.

[0032] In some embodiments of the present invention, in step S1, the titanium alloy powder is selected from one of TC4 titanium alloy powder, TB2 titanium alloy powder, TA7 titanium alloy powder, TA8 titanium alloy powder, TA15 titanium alloy powder and TC11 titanium alloy powder.

[0033] In some embodiments of the present invention, in step S5, the pressure of the molding process is 10 MPa to 30 MPa.

[0034] In some embodiments of the present invention, in step S5, the sintering temperature is 1200°C to 1300°C, the time is 60 min to 120 min, and the pressure is 30 MPa to 50 MPa.

[0035] The present invention will be further described below with reference to specific embodiments.

[0036] Example 1 A1. An alkali metal chloride salt, a titanium-containing inorganic salt, and an organic solvent are mixed to obtain a mixed solution; wherein the titanium-containing inorganic salt is titanium sulfate, the alkali metal chloride salt is composed of potassium chloride and sodium chloride in a mass ratio of 1:1, and the mass ratio of the titanium-containing inorganic salt to the alkali metal chloride salt is 1:1; the organic solvent is ethanol; the mass fraction of the mixed salt composed of the alkali metal chloride salt and the titanium-containing inorganic salt in the mixed solution is 30%.

[0037] A2. After stirring the mixed solution, perform vacuum distillation to obtain titanium-containing mixed salt powder; the stirring speed is 75 rpm and the time is 2 hours; the vacuum distillation temperature is 60℃ and the time is 20 minutes.

[0038] A3. The titanium-containing mixed salt powder is mixed with silicon carbide fiber and then subjected to heat treatment to obtain silicon carbide fiber coated with MAX phase; the mass ratio of the titanium-containing mixed salt powder to the silicon carbide fiber is 10:2; the length of the silicon carbide fiber is 1 mm and the diameter is 50 μm; the temperature of the heat treatment is 1000℃ and the time is 60 min, and the titanium-containing mixed salt powder is in a molten state at 1000℃.

[0039] A4. The silicon carbide fibers coated with the MAX phase are mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The titanium alloy powder is TC4 titanium alloy powder, and the mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder is 3:10. The ball milling speed is 50 rpm and the time is 5 h. The mass ratio of the ball to the powder during the ball milling process is 5:1.

[0040] A5. After the mixed powder is molded, it is sintered to obtain silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 10 MPa; the sintering temperature is 1200℃, the time is 60 min, and the pressure is 30 MPa.

[0041] Example 2 A1. An alkali metal chloride salt, a titanium-containing inorganic salt, and an organic solvent are mixed to obtain a mixed solution; wherein the titanium-containing inorganic salt is titanium sulfate, the alkali metal chloride salt is composed of potassium chloride and sodium chloride in a mass ratio of 1:1, and the mass ratio of the titanium-containing inorganic salt to the alkali metal chloride salt is 2:1; the organic solvent is ethanol; the mass fraction of the mixed salt composed of the alkali metal chloride salt and the titanium-containing inorganic salt in the mixed solution is 40%.

[0042] A2. After stirring the mixed solution, perform vacuum distillation to obtain titanium-containing mixed salt powder; the stirring speed is 75 rpm and the time is 3 hours; the vacuum distillation temperature is 70℃ and the time is 10 minutes.

[0043] A3. The titanium-containing mixed salt powder is mixed with silicon carbide fiber and then subjected to heat treatment to obtain silicon carbide fiber coated with MAX phase; the mass ratio of the titanium-containing mixed salt powder to the silicon carbide fiber is 10:2; the length of the silicon carbide fiber is 1 mm and the diameter is 50 μm; the temperature of the heat treatment is 1000℃ and the time is 60 min, and the titanium-containing mixed salt powder is in a molten state at 1000℃.

[0044] A4. The silicon carbide fibers coated with the MAX phase are mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The titanium alloy powder is TC4 titanium alloy powder, and the mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder is 1:10. The ball milling speed is 50 rpm and the time is 5 h. The mass ratio of the ball to the powder during the ball milling process is 5:1.

[0045] A5. After the mixed powder is molded, it is sintered to obtain silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 10 MPa; the sintering temperature is 1200℃, the time is 60 min, and the pressure is 30 MPa.

[0046] Example 3 A1. An alkali metal chloride salt, a titanium-containing inorganic salt, and an organic solvent are mixed to obtain a mixed solution; wherein the titanium-containing inorganic salt is titanium sulfate, the alkali metal chloride salt is composed of potassium chloride and sodium chloride in a mass ratio of 1:1, and the mass ratio of the titanium-containing inorganic salt to the alkali metal chloride salt is 2:1; the organic solvent is ethanol; the mass fraction of the mixed salt composed of the alkali metal chloride salt and the titanium-containing inorganic salt in the mixed solution is 35%.

[0047] A2. After stirring the mixed solution, perform vacuum distillation to obtain titanium-containing mixed salt powder; the stirring speed is 75 rpm and the time is 3 hours; the vacuum distillation temperature is 50°C and the time is 30 minutes.

[0048] A3. The titanium-containing mixed salt powder is mixed with silicon carbide fiber and then subjected to heat treatment to obtain silicon carbide fiber coated with MAX phase; the mass ratio of the titanium-containing mixed salt powder to the silicon carbide fiber is 10:3; the length of the silicon carbide fiber is 1 mm and the diameter is 50 μm; the temperature of the heat treatment is 1100℃ and the time is 30 min, and the titanium-containing mixed salt powder is in a molten state at 1100℃.

[0049] A4. The silicon carbide fibers coated with the MAX phase are mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The titanium alloy powder is TC4 titanium alloy powder, and the mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder is 5:10. The ball milling speed is 50 rpm and the time is 5 h. The mass ratio of the ball to the powder during the ball milling process is 5:1.

[0050] A5. After the mixed powder is molded, it is sintered to obtain silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 10 MPa; the sintering temperature is 1200℃, the time is 60 min, and the pressure is 30 MPa.

[0051] Example 4 A1. An alkali metal chloride salt, a titanium-containing inorganic salt, and an organic solvent are mixed to obtain a mixed solution; wherein the titanium-containing inorganic salt is titanium sulfate, the alkali metal chloride salt is composed of potassium chloride and sodium chloride in a mass ratio of 1:1, and the mass ratio of the titanium-containing inorganic salt to the alkali metal chloride salt is 2:1; the organic solvent is ethanol; the mass fraction of the mixed salt composed of the alkali metal chloride salt and the titanium-containing inorganic salt in the mixed solution is 40%.

[0052] A2. After stirring the mixed solution, perform vacuum distillation to obtain titanium-containing mixed salt powder; the stirring speed is 75 rpm and the time is 3 hours; the vacuum distillation temperature is 70℃ and the time is 30 minutes.

[0053] A3. The titanium-containing mixed salt powder is mixed with silicon carbide fiber and then subjected to heat treatment to obtain silicon carbide fiber coated with MAX phase; the mass ratio of the titanium-containing mixed salt powder to the silicon carbide fiber is 10:3; the length of the silicon carbide fiber is 1 mm and the diameter is 50 μm; the temperature of the heat treatment is 1100℃ and the time is 30 min, and the titanium-containing mixed salt powder is in a molten state at 1100℃.

[0054] A4. The silicon carbide fibers coated with the MAX phase are mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The titanium alloy powder is TC4 titanium alloy powder, and the mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder is 3:10. The ball milling speed is 100 rpm and the time is 10 h. The mass ratio of the ball to the powder during the ball milling process is 10:1.

[0055] A5. After the mixed powder is molded, it is sintered to obtain silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 20MPa; the sintering temperature is 1200℃, the time is 60min, and the pressure is 30MPa.

[0056] Example 5 A1. An alkali metal chloride salt, a titanium-containing inorganic salt, and an organic solvent are mixed to obtain a mixed solution; wherein the titanium-containing inorganic salt is titanium sulfate, the alkali metal chloride salt is composed of potassium chloride and sodium chloride in a mass ratio of 1:1, and the mass ratio of the titanium-containing inorganic salt to the alkali metal chloride salt is 2:1; the organic solvent is ethanol; the mass fraction of the mixed salt composed of the alkali metal chloride salt and the titanium-containing inorganic salt in the mixed solution is 40%.

[0057] A2. After stirring the mixed solution, perform vacuum distillation to obtain titanium-containing mixed salt powder; the stirring speed is 75 rpm and the time is 3 hours; the vacuum distillation temperature is 70℃ and the time is 30 minutes.

[0058] A3. The titanium-containing mixed salt powder is mixed with silicon carbide fiber and then subjected to heat treatment to obtain silicon carbide fiber coated with MAX phase; the mass ratio of the titanium-containing mixed salt powder to the silicon carbide fiber is 10:3; the length of the silicon carbide fiber is 1 mm and the diameter is 50 μm; the temperature of the heat treatment is 1100℃ and the time is 30 min, and the titanium-containing mixed salt powder is in a molten state at 1100℃.

[0059] A4. The silicon carbide fibers coated with the MAX phase are mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The titanium alloy powder is TC4 titanium alloy powder, and the mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder is 3:10. The ball milling speed is 100 rpm and the time is 10 h. The mass ratio of the ball to the powder during the ball milling process is 10:1.

[0060] A5. After the mixed powder is molded, it is sintered to obtain silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 20 MPa; the sintering temperature is 1300℃, the time is 30 min, and the pressure is 40 MPa.

[0061] Example 6 A1. An alkali metal chloride salt, a titanium-containing inorganic salt, and an organic solvent are mixed to obtain a mixed solution; wherein the titanium-containing inorganic salt is titanium sulfate, the alkali metal chloride salt is composed of potassium chloride and sodium chloride in a mass ratio of 1:1, and the mass ratio of the titanium-containing inorganic salt to the alkali metal chloride salt is 2:1; the organic solvent is ethanol; the mass fraction of the mixed salt composed of the alkali metal chloride salt and the titanium-containing inorganic salt in the mixed solution is 40%.

[0062] A2. After stirring the mixed solution, perform vacuum distillation to obtain titanium-containing mixed salt powder; the stirring speed is 75 rpm and the time is 3 hours; the vacuum distillation temperature is 70℃ and the time is 30 minutes.

[0063] A3. The titanium-containing mixed salt powder is mixed with silicon carbide fiber and then subjected to heat treatment to obtain silicon carbide fiber coated with MAX phase; the mass ratio of the titanium-containing mixed salt powder to the silicon carbide fiber is 10:3; the length of the silicon carbide fiber is 1 mm and the diameter is 50 μm; the temperature of the heat treatment is 1100℃ and the time is 30 min, and the titanium-containing mixed salt powder is in a molten state at 1100℃.

[0064] A4. The silicon carbide fibers coated with the MAX phase are mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The titanium alloy powder is TC4 titanium alloy powder, and the mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder is 3:10. The ball milling speed is 100 rpm and the time is 10 h. The mass ratio of the ball to the powder during the ball milling process is 10:1.

[0065] A5. After the mixed powder is molded, it is sintered to obtain silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 20 MPa; the sintering temperature is 1200℃, the time is 30 min, and the pressure is 50 MPa.

[0066] Comparative Example 1 The difference from Example 1 is that steps A1, A2, and A3 are omitted, and the silicon carbide fibers coated with the MAX phase in step A4 are replaced with ordinary silicon carbide fibers. The specific steps are as follows: Silicon carbide fibers (uncoated with the MAX phase) were mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The silicon carbide fibers were 1 mm in length and 50 μm in diameter. The titanium alloy powder was TC4 titanium alloy powder. The mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder was 3:10. The ball milling process was carried out at a speed of 50 rpm for 5 hours, and the mass ratio of the ball to the powder during the ball milling process was 5:1.

[0067] The mixed powder is molded and then sintered to obtain a silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 10 MPa; the sintering temperature is 1200℃, the time is 60 min, and the pressure is 30 MPa.

[0068] Comparative Example 2 The difference from Example 2 is that steps A1, A2, and A3 are omitted, and the silicon carbide fibers coated with the MAX phase in step A4 are replaced with ordinary silicon carbide fibers. The specific steps are as follows: Silicon carbide fibers (uncoated with the MAX phase) were mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The silicon carbide fibers were 1 mm in length and 50 μm in diameter. The titanium alloy powder was TC4 titanium alloy powder. The mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder was 1:10. The ball milling process was carried out at a speed of 50 rpm for 5 hours, and the mass ratio of the ball to the powder was 5:1.

[0069] The mixed powder is molded and then sintered to obtain a silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 10 MPa; the sintering temperature is 1200℃, the time is 60 min, and the pressure is 30 MPa.

[0070] Comparative Example 3 The difference from Example 3 is that steps A1, A2, and A3 are omitted, and the silicon carbide fibers coated with the MAX phase in step A4 are replaced with ordinary silicon carbide fibers. The specific steps are as follows: Silicon carbide fibers (uncoated with the MAX phase) were mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The silicon carbide fibers were 1 mm in length and 50 μm in diameter. The titanium alloy powder was TC4 titanium alloy powder. The mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder was 5:10. The ball milling process was carried out at a speed of 50 rpm for 5 hours, and the mass ratio of the ball to the powder was 5:1.

[0071] The mixed powder is molded and then sintered to obtain a silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 10 MPa; the sintering temperature is 1200℃, the time is 60 min, and the pressure is 30 MPa.

[0072] Comparative Example 4 The difference from Example 4 is that steps A1, A2, and A3 are omitted, and the silicon carbide fibers coated with the MAX phase in step A4 are replaced with ordinary silicon carbide fibers. The specific steps are as follows: Silicon carbide fibers (uncoated with the MAX phase) were mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The silicon carbide fibers were 1 mm in length and 50 μm in diameter. The titanium alloy powder was TC4 titanium alloy powder. The mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder was 3:10. The ball milling process was carried out at a speed of 100 rpm for 10 hours, and the mass ratio of the ball to the powder during the ball milling process was 10:1.

[0073] The mixed powder is molded and then sintered to obtain a silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 20 MPa; the sintering temperature is 1200℃, the time is 60 min, and the pressure is 30 MPa.

[0074] Comparative Example 5 The difference from Example 5 is that steps A1, A2, and A3 are omitted, and the silicon carbide fibers coated with the MAX phase in step A4 are replaced with ordinary silicon carbide fibers. The specific steps are as follows: Silicon carbide fibers (uncoated with the MAX phase) were mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The silicon carbide fibers were 1 mm in length and 50 μm in diameter. The titanium alloy powder was TC4 titanium alloy powder. The mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder was 3:10. The ball milling process was carried out at a speed of 100 rpm for 10 hours, and the mass ratio of the ball to the powder during the ball milling process was 10:1.

[0075] The mixed powder is molded and then sintered to obtain a silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 20 MPa; the sintering temperature is 1300℃, the time is 30 min, and the pressure is 40 MPa.

[0076] Comparative Example 6 The difference from Example 6 is that steps A1, A2, and A3 are omitted, and the silicon carbide fibers coated with the MAX phase in step A4 are replaced with ordinary silicon carbide fibers. The specific steps are as follows: Silicon carbide fibers (uncoated with the MAX phase) were mixed with titanium alloy powder and then ball-milled to obtain a mixed powder. The silicon carbide fibers were 1 mm in length and 50 μm in diameter. The titanium alloy powder was TC4 titanium alloy powder. The mass ratio of the silicon carbide fibers coated with the MAX phase to the titanium alloy powder was 3:10. The ball milling process was carried out at a speed of 100 rpm for 10 hours, and the mass ratio of the ball to the powder during the ball milling process was 10:1.

[0077] The mixed powder is molded and then sintered to obtain a silicon carbide fiber reinforced titanium matrix composite material; the molding pressure is 20 MPa; the sintering temperature is 1200℃, the time is 30 min, and the pressure is 50 MPa.

[0078] Experimental Example XRD and scanning electron microscopy analyses were performed on the MAX phase-coated silicon carbide fibers prepared in Example 1. The results are shown in the figure. Figure 2 and Figure 3 ,from Figure 2 It can be seen that the MAX phase-coated silicon carbide fibers are composed of silicon carbide and the MAX phase (Ti3SiC2). Figure 3 It can be seen that the surface of silicon carbide fibers is coated with the MAX phase (Ti3SiC2).

[0079] The tensile strength and elongation at break of the silicon carbide fiber reinforced titanium matrix composites prepared in Examples 1 to 6 and Comparative Examples 1 to 6 were tested. The results are shown in Table 1. As can be seen from Table 1, compared with Comparative Examples 1 to 6, the silicon carbide fiber reinforced titanium matrix composites prepared in Examples 1 to 6 have higher tensile strength and higher elongation at break, indicating that the silicon carbide fiber reinforced titanium matrix composites prepared in Examples 1 to 6 have higher strength and toughness.

[0080] Table 1

[0081] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for preparing a silicon carbide fiber-reinforced titanium matrix composite material, characterized in that, include: Step S1: Mix the alkali metal chloride salt, the titanium-containing inorganic salt, and the organic solvent to obtain a mixed solution; Step S2: After stirring the mixed solution, perform vacuum distillation to obtain titanium-containing mixed salt powder; Step S3: After mixing the titanium-containing mixed salt powder with silicon carbide fibers, heat treatment is performed to obtain silicon carbide fibers coated with the MAX phase; wherein, the temperature of the heat treatment is set to allow the titanium-containing mixed salt powder to be in a molten state; Step S4: Mix the silicon carbide fiber coated with the MAX phase with the titanium alloy powder, and then perform ball milling to obtain the mixed powder. Step S5: After molding the mixed powder, sinter it to obtain silicon carbide fiber reinforced titanium matrix composite material.

2. The method for preparing silicon carbide fiber reinforced titanium matrix composite material according to claim 1, characterized in that, In step S1, the titanium-containing inorganic salt includes at least one of titanium sulfate, titanium orthosulfate, and titanium oxysulfate.

3. The method for preparing silicon carbide fiber reinforced titanium matrix composite material according to claim 1, characterized in that, In step S1, the alkali metal chloride salt includes at least one of potassium chloride and sodium chloride.

4. The method for preparing silicon carbide fiber reinforced titanium matrix composite material according to claim 1, characterized in that, In step S1, the mass ratio of the titanium-containing inorganic salt to the alkali metal chloride salt is (1 to 2): 1, and the mass fraction of the mixed salt composed of the alkali metal chloride salt and the titanium-containing inorganic salt in the mixed solution is 30% to 40%.

5. The method for preparing silicon carbide fiber reinforced titanium matrix composite material according to claim 1, characterized in that, In step S2, the stirring speed is 50 rpm to 100 rpm and the time is 1 h to 3 h; the vacuum distillation temperature is 50 °C to 70 °C and the time is 10 min to 30 min.

6. The method for preparing silicon carbide fiber reinforced titanium matrix composite material according to claim 1, characterized in that, In step S3, the mass ratio of the titanium-containing mixed salt powder to the silicon carbide fiber is 10:(2 to 3).

7. The method for preparing silicon carbide fiber reinforced titanium matrix composite material according to claim 1, characterized in that, In step S3, the heating temperature is 900°C to 1100°C, and the time is 30 min to 60 min.

8. The method for preparing silicon carbide fiber reinforced titanium matrix composite material according to claim 1, characterized in that, In step S4, the mass ratio of the silicon carbide fiber coated with the MAX phase to the titanium alloy powder is (1 to 5): 10; the ball milling speed is 50 rpm to 100 rpm, and the time is 5 h to 10 h.

9. The method for preparing silicon carbide fiber reinforced titanium matrix composite material according to claim 1, characterized in that, In step S5, the pressure of the molding process is 10 MPa to 30 MPa.

10. The method for preparing silicon carbide fiber reinforced titanium matrix composite material according to claim 1, characterized in that, In step S5, the sintering temperature is 1200℃ to 1300℃, the time is 60min to 120min, and the pressure is 30MPa to 50MPa.

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