CN115011831B - Wear-resistant titanium alloy composite material and preparation method thereof - Google Patents

Wear-resistant titanium alloy composite material and preparation method thereof Download PDF

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CN115011831B
CN115011831B CN202210625627.0A CN202210625627A CN115011831B CN 115011831 B CN115011831 B CN 115011831B CN 202210625627 A CN202210625627 A CN 202210625627A CN 115011831 B CN115011831 B CN 115011831B
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powder
titanium alloy
composite material
wear
titanium
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CN115011831A (en
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何新波
彭伟刚
张涛
林涛
关洪达
张子建
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Guangzhou Institute For Advanced Material University Of Science & Technology Beijing
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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  • Powder Metallurgy (AREA)

Abstract

The invention discloses a wear-resistant titanium alloy composite material and a preparation method thereof, the method comprises the steps of firstly adding irregular titanium alloy powder and high-strength boron carbide ceramic particles into a mixer according to a certain proportion for mixing, so that the boron carbide particles with smaller sizes are uniformly distributed in the titanium powder and are partially adsorbed on the surface of the titanium alloy matrix material powder, then placing the uniformly mixed powder into a die for simple die pressing and forming to prepare a green compact, and finally performing densification sintering on the green compact to obtain the wear-resistant titanium alloy composite material. The prepared wear-resistant titanium alloy composite material is internally provided with new reinforcing phases, the high-hardness reinforcing phases improve the hardness of the titanium alloy, and the wear resistance of the material is improved by bearing partial load in the friction process.

Description

Wear-resistant titanium alloy composite material and preparation method thereof
Technical Field
The invention belongs to the technical field of metal matrix composite materials, and particularly relates to a wear-resistant titanium alloy composite material and a preparation method of the wear-resistant titanium alloy composite material.
Background
Metal Matrix Composites (MMCs), for short, are composites of metals and their alloys as matrix, artificially combined with one or more metal or non-metal reinforcing phases, wherein the reinforcing materials are mostly inorganic non-metals, such as ceramics, carbon, graphite, boron, etc., and also can be metal wires. It forms a modern composite system with polymer matrix composites, ceramic matrix composites, and carbon/carbon composites. The metal-based composite material greatly improves a plurality of properties such as thermal expansibility, strength, fracture toughness, impact toughness, wear resistance, electrical property, magnetic property and the like of a single metal material or an alloy material, has the advantages of fatigue resistance, wear resistance, high heat conduction, low thermal expansion, radiation shielding and the like, becomes a key material required by the preparation of national important requirements and national economic equipment of aerospace, electronic packaging, nuclear power, automobiles, rail transit and the like, and the using amount of the metal-based composite material is also one of the marks of the material science and technology level.
The development of titanium and titanium alloys has been over 60 years old and is a light metal material which is vigorously developed in various countries around the world. In particular, titanium and titanium alloys are lightweight, high strength materials with a density (4507 kg/m) 3 ) Second only to magnesium alloys (1738 kg/m) 3 ) With aluminium alloy (2700 kg/m) 3 ) Lower than that of steel (7874 kg/m) 3 ) Copper alloy (8920 kg/m) 3 ) Tungsten alloy (19250 kg/m) 3 ) And the like, and the parts with the same size have smaller mass and higher strength than the magnesium alloy and the aluminum alloy. Meanwhile, the hardness and the toughness of the titanium and the titanium alloy are higher than those of the magnesium alloy and the aluminum alloy, the thermal expansion coefficient is low and is far lower than those of materials such as steel, copper alloy, aluminum alloy and the like, the size precision of the prepared part is high, and the size variation is small under the large temperature difference. In addition, titanium and titanium alloy have no magnetism, and have strong fatigue performance and radiation resistance. Therefore, the titanium and the titanium alloy have excellent comprehensive performance and have outstanding competitiveness in the aspects of aviation, aerospace, navigation, chemical engineering, metallurgy, biomedical engineering and advanced engineering materials.
However, titanium and titanium alloy have poor wear resistance, low hardness and ultra-high production cost, and the defects also seriously affect the application of the titanium and titanium alloy in engineering, and how to improve the defects becomes one of the important concerns of researchers.
Disclosure of Invention
In order to solve the problems, the invention carries out a great deal of research and screening on the existing materials, wherein the ceramic materials have the advantages of low cost, heat resistance, ageing resistance, good mechanical strength and hardness, and the novel material compounded by the ceramic and the titanium or the titanium alloy not only can expand the application range of the ceramic material by utilizing the metal characteristics of the titanium or the titanium alloy, but also can improve the application efficiency of the titanium or the titanium alloy by utilizing the high-temperature characteristics and the biological activity of the ceramic. Based on the above, the invention provides a wear-resistant titanium alloy composite material and a preparation method thereof, the method comprises the steps of firstly adding irregular titanium alloy powder and high-strength boron carbide ceramic particles into a mixer according to a certain proportion for mixing, so that the boron carbide particles with smaller sizes are uniformly distributed in the titanium powder and are partially adsorbed on the surface of the titanium alloy matrix material powder, then placing the uniformly mixed powder into a mold for simple mold pressing forming to prepare a green body, and finally performing densification sintering on the green body to obtain the wear-resistant titanium alloy composite material. New reinforcing phases are generated in the prepared wear-resistant titanium alloy composite material, the high-hardness reinforcing phases improve the hardness of the titanium alloy, and the wear resistance of the material is improved by bearing partial load in the friction process.
In a first aspect of the present invention, the present invention provides a method for preparing a wear-resistant titanium alloy composite material, which sequentially comprises the following steps:
(S1) mixing materials: weighing m as mass 1 Titanium-based powder and mass m 2 And mixing them uniformly to obtain a composite material powder, wherein the mass m of the boron carbide particles 2 The total mass (m) of the composite material powder 1 +m 2 ) The percentage of (A) is 1-2%;
(S2) die pressing: carrying out compression molding on the composite material powder obtained in the step (S1) under the pressure of 1.5-2.0GPa to obtain a green body;
(S3) sintering: sintering the green body obtained in the step (S2) in an inert atmosphere, wherein the sintering process parameters are as follows: the heating rate is 2-5 ℃/min, the sintering temperature is 1000-1300 ℃, the sintering time is 30-240min, and the wear-resistant titanium alloy composite material can be obtained after the temperature is reduced to the room temperature after sintering.
The method comprises the steps of firstly adding irregular titanium alloy powder and high-strength boron carbide ceramic particles into a mixer according to a certain proportion for mixing, so that the boron carbide particles with smaller sizes are uniformly distributed in the titanium powder and are partially adsorbed on the surface of the titanium alloy matrix material powder, then placing the uniformly mixed powder into a die for simple die pressing to form a green body, and finally performing densification sintering on the green body to complete the preparation of the high-wear-resistant titanium alloy. The preparation method has low cost and can be used for large-scale preparation.
Preferably, in the above method, the particle diameter of the titanium-based powder in the step (S1) is 25 to 65 μm; the particle size of the boron carbide particles is 1-23 mu m, and the particle size of the titanium-based powder is larger than that of the boron carbide particles so that the boron carbide particles with smaller particle sizes are better adsorbed on the titanium-based powder particles.
Preferably, in the above method, the titanium-based powder is at least one of Ti, TC4, TC8, TC9, TA7 and the like, and the titanium-based powder is irregular-shaped powder and has a particle size of more preferably 10-40 μm, and most preferably 20-30 μm.
Preferably, in the above method, the mixing in step (S1) is performed by mechanical mixing, and more preferably by a ball mill, wherein the ball milling medium is agate balls, stainless steel balls or zirconia balls, the ball milling speed is 50-150r/min, and the ball milling time is 12-36h, so as to obtain the uniformly mixed composite powder.
Preferably, in the above method, the mixing in step (S1) is performed under an inert atmosphere such as argon or helium without adding any auxiliary agent, so as to avoid the endothermic oxidation of the raw material powder during the mixing.
Most particularly preferably, in the above method, the weighing of the titanium-based powder and the boron carbide particles in the step (S1) is performed in a vacuum glove box to avoid the powder from being oxidized due to absorption during the weighing of the raw materials.
Preferably, in the above method, the mold used for the compression molding in the step (S2) is not strictly limited, and any mold may be used as long as it can withstand a pressure of 1.5-2.0 GPa.
Preferably, in the method, the pressure used for compression molding in the step (S2) is 1.6-1.9GPa, and the suitable molding pressure can effectively improve the compactness of the sintered titanium alloy composite material, specifically, 96.03%.
Preferably, in the above method, the inert atmosphere in the step (S3) is argon or helium, and the purity is 99.99% or more.
Preferably, in the above method, the sintering in the step (S3) is sintering in a tube furnace.
Preferably, in the above method, the temperature in the sintering process in the step (S3) is controlled by firstly raising the temperature to 900-1100 ℃ at a rate of 3-5 ℃/min and maintaining the temperature for 30-60min, and then raising the temperature to 1200-1300 ℃ at a rate of 2-3 ℃/min and maintaining the temperature for 60-120min. Titanium (Ti) and boron carbide (B) 4 C) The reaction temperature is 800-1000 ℃, so that the Ti and the B can be kept for 30-60min at about 1000 ℃ in the sintering process 4 C reacts completely to generate enough TiB and TiC reinforcing phases, so that the surface hardness and the friction performance of the composite material are improved.
According to a second aspect of the invention, the invention also provides a wear-resistant titanium alloy composite material prepared by the above method.
The novel reinforcing phase is generated in the wear-resistant titanium alloy composite material prepared by the invention, the high-hardness reinforcing phase particles improve the hardness of the titanium alloy, and the wear resistance of the material is improved by bearing partial load in the friction process. The macro hardness of the wear-resistant titanium alloy composite material can reach as high as 42.1HRC, and the wear rate under the friction conditions of 30N load and 0.5m/s sliding speed can be as low as 2.68 multiplied by 10 -6 mm 3 The friction coefficient is 0.53, the microhardness can be regulated and controlled to be 402HV-699HV, and the thickness of the friction layer is only 6 μm.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention adds boron carbide (B) into titanium-based powder 4 C) The particles are sintered, and Ti and B are fully utilized 4 C, in-situ reaction, wherein TiB and TiC generated in the process are used as a strengthening phase, wherein the TiB creates enough nucleation sites for the recrystallization process to realize grain refinement, the B element in the TiB also plays a role in reducing the creep rate of a composite phase to improve the creep resistance of the titanium alloy, and the TiB and TiC have good chemical compatibility with Ti, so that the (TiB + TiC)/Ti titanium-based composite material prepared by the invention combines the extensibility and the toughness of a matrix material and the advantages of high strength and high elastic modulus of a boron carbide ceramic strengthening phase, thereby having the excellent characteristics of high heat resistance, wear resistance, fatigue resistance, low high-temperature thermal expansion coefficient and the like.
(2) In the preparation process, the uniformly mixed composite material powder is subjected to compression molding and densification sintering, so that the reinforcing phase generated in the wear-resistant titanium alloy prepared at low cost on a large scale can be firmly combined with the base material, and the problems of condensation of the reinforcing phase in the base material, poor interface bonding force between the reinforcing phase and the base material and the like are solved to a certain extent.
(3) The wear-resistant titanium alloy composite material prepared by the invention has new reinforcing phase, the high-hardness reinforcing phase particles improve the hardness of the titanium alloy, and the wear resistance of the material is improved by bearing partial load in the friction process.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the technical solutions of the present invention will be described in detail with specific embodiments below.
The inert atmosphere used in the following examples was argon atmosphere, which was 99.9999% pure.
Examples of the invention
Inventive example 1
(S1) mixing materials: weighing TC4 powder (D) in a vacuum glove box 50 =27 μm) 98g and boron carbide particles (D) 50 =6 μm) 2g was placed in a closed vessel filled with an argon atmosphere, and zirconia balls as a ball-milling medium were added to the vessel, followed by mechanically mixing the closed vessel with a ball mill at a rotation speed of 100r/min for 24 hours to obtain a composite powder.
(S2) die pressing: the obtained composite material powder was placed in a steel die and compression molded under a pressure of 1.5GPa to obtain a green compact.
(S3) sintering: and (3) quickly placing the pressed green body into a tubular furnace filled with argon, heating to 1000 ℃ at the speed of 5 ℃/min, preserving the heat for 60min, heating to 1200 ℃ at the speed of 2 ℃/min, preserving the heat for 60min, and cooling to room temperature to obtain the wear-resistant titanium alloy composite material, which is marked as A1.
Inventive example 2
(S1) mixing materials: weighing TC4 powder (D) in a vacuum glove box 50 =27 μm) 98.5g and boron carbideParticles (D) 50 =6 μm) 1.5g of the powder was placed in a closed container filled with an argon atmosphere, and ball-milling media zirconia balls were added to the container, followed by mechanical mixing of the closed container with a ball mill at a rotation speed of 120r/min for 24 hours, to obtain a composite powder.
(S2) die pressing: the obtained composite material powder was placed in a steel die and compression molded under a pressure of 1.6GPa to obtain a green compact.
(S3) sintering: and (3) quickly placing the pressed green body into a tubular furnace filled with argon, heating to 1000 ℃ at the speed of 4 ℃/min, preserving the heat for 30min, heating to 1300 ℃ at the speed of 2 ℃/min, preserving the heat for 60min, and cooling to room temperature to obtain the wear-resistant titanium alloy composite material, which is marked as A2.
Inventive example 3
(S1) mixing materials: weighing TC4 powder (D) in a vacuum glove box 50 99g of boron carbide particles (D) =27 μm 50 =6 μm) 1g was placed in a closed vessel filled with an argon atmosphere, and zirconia balls as a ball-milling medium were added to the vessel, followed by mechanically mixing the closed vessel with a ball mill at a rotation speed of 80r/min for 36 hours, to obtain a composite powder.
(S2) die pressing: the obtained composite powder was placed in a steel die and compression molded under a pressure of 1.7GPa to obtain a green compact.
(S3) sintering: and (3) quickly placing the pressed green body into a tubular furnace filled with argon, heating to 1000 ℃ at the speed of 4 ℃/min, preserving the heat for 30min, heating to 1200 ℃ at the speed of 2 ℃/min, preserving the heat for 120min, and cooling to room temperature to obtain the wear-resistant titanium alloy composite material, which is marked as A3.
Inventive example 4
(S1) mixing materials: weighing TC4 powder (D) in a vacuum glove box 50 99g of =27 μm) and boron carbide particles (D) 50 =6 μm) 1g was placed in a closed vessel filled with an argon atmosphere, and zirconia balls as a ball-milling medium were added to the vessel, followed by subjecting the closed vessel to mechanical mixing for 18 hours at a rotation speed of 150r/min using a ball mill, to obtain a composite powder.
(S2) die pressing: the obtained composite powder was placed in a steel die and compression molded under a pressure of 1.7GPa to obtain a green compact.
(S3) sintering: and (3) quickly placing the pressed green body into a tubular furnace filled with argon, heating to 1200 ℃ at the speed of 4 ℃/min, preserving the temperature for 120min, and cooling to room temperature to obtain the wear-resistant titanium alloy composite material, which is marked as A4.
Inventive example 5
(S1) mixing materials: weighing TC4 powder (D) in a vacuum glove box 50 99g of boron carbide particles (D) =27 μm 50 =6 μm) 1g was placed in a closed vessel filled with an argon atmosphere, and zirconia balls as a ball-milling medium were added to the vessel, followed by mechanically mixing the closed vessel with a ball mill at a rotation speed of 70r/min for 36 hours to obtain a composite powder.
(S2) die pressing: the obtained composite material powder is placed in a steel die and compression molding is carried out under the pressure of 2.0GPa, and a green body is obtained.
(S3) sintering: and (3) quickly putting the pressed green body into a tube furnace filled with argon, heating to 1000 ℃ at the speed of 4 ℃/min, preserving the heat for 45min, heating to 1250 ℃ at the speed of 2 ℃/min, preserving the heat for 120min, and cooling to room temperature to obtain the wear-resistant titanium alloy composite material, which is marked as A5.
Comparative examples
Comparative example 1
(S1) mixing materials: weighing TC4 powder (D) in a vacuum glove box 50 =27 μm) 100g was placed in a closed container filled with an argon atmosphere, and ball-milling media zirconia balls were added to the container, followed by mechanical mixing of the closed container using a ball mill at a rotation speed of 100r/min for 24 hours, to obtain a powder.
(S2) die pressing: the obtained composite powder was placed in a steel mold and compression-molded under a pressure of 1.7GPa to obtain a green compact.
(S3) sintering: and (3) quickly putting the pressed green body into a tube furnace filled with argon, heating to 1000 ℃ at the speed of 4 ℃/min, preserving heat for 30min, heating to 1200 ℃ at the speed of 2 ℃/min, preserving heat for 120min, and cooling to room temperature to obtain the titanium alloy, wherein the mark is B1.
Comparative example 2
(S1) mixing materials: weighing TC4 powder (D) in a vacuum glove box 50 97g of =27 μm) and boron carbide particles (D) 50 =6 μm) 3g was placed in a closed vessel filled with an argon atmosphere, and ball milling media zirconia balls were added to the vessel, followed by mechanical mixing of the closed vessel with a ball mill at a rotation speed of 100r/min for 24 hours, to obtain composite powder.
(S2) die pressing: the obtained composite powder was placed in a steel mold and compression-molded under a pressure of 1.7GPa to obtain a green compact.
(S3) sintering: and (3) quickly placing the pressed green body into a tubular furnace filled with argon, heating to 1000 ℃ at the speed of 4 ℃/min, preserving the heat for 30min, heating to 1200 ℃ at the speed of 2 ℃/min, preserving the heat for 120min, and cooling to room temperature to obtain the titanium alloy composite material, wherein the label is B2.
Comparative example 3
(S1) mixing materials: weighing TC4 powder (D) in a vacuum glove box 50 99g of =27 μm) and boron carbide particles (D) 50 =6 μm) 1g was placed in a closed vessel filled with an argon atmosphere, and zirconia balls as a ball-milling medium were added to the vessel, followed by mechanically mixing the closed vessel with a ball mill at a rotation speed of 100r/min for 24 hours to obtain a composite powder.
(S2) die pressing: the obtained composite powder was placed in a steel die and compression molded under a pressure of 1.7GPa to obtain a green compact.
(S3) sintering: and (3) quickly placing the pressed green body into a tube furnace filled with argon, heating to 1200 ℃ at the speed of 8 ℃/min, preserving the temperature for 90min, and then cooling to room temperature to obtain the titanium alloy composite material, which is marked as B3.
Test examples
The wear-resistant titanium alloy composite materials A1 to A5 prepared in inventive examples 1 to 5 and the materials B1 to B3 prepared in comparative examples 1 to 3 were subjected to the following performance tests in accordance with the following standards, and the test results are set forth in table 1 below.
Macro hardness: and (3) measuring the macroscopic hardness of the sample by using a WHR-80D full Rockwell hardness tester, maintaining the pressure for 5s, taking 5 points from the surface of each sample, testing and averaging.
Density (d): the ratio of the actual density (. Rho.) of the sample, measured by the method for measuring the density of the compact sintered metallic material and the cemented carbide of GB 3850-1983, to the theoretical density (. Rho.'), calculated by the following formula
ρ＇＝∑ρ i V i
Where ρ is i Is the theoretical density of the ith component, V i Is the volume fraction of the ith constituent element.
Wear rate: under the conditions of load of 30N, sliding speed of 0.5m/s and total abrasion distance of 1127m, samples before and after the test are cleaned by alcohol and dried in an ultrasonic cleaning machine, and are measured by an analytical balance with the sensing quantity of 0.01mg, each sample is measured for 3 times, and the average value is used for calculating the abrasion rate, wherein the calculation formula is as follows:
wear rate (Ws) = wear loss (Δ m)/(specimen density (ρ) × sliding distance (L).
Coefficient of friction: the friction method adopts a pin-disc friction mode, the load is 30N, the sliding speed is 5m/s, and the ratio of the friction torque to the actual load torque under the condition that the total abrasion distance is 1127 m. The friction torque data are acquired through a computer, and the load torque is obtained by multiplying the load force provided by the actual weight by the force arm.
Microhardness: the hardness testing method is determined by a table type VTD512 hardness tester according to the regulations of national standard GB4342-84 'Metal micro Vickers hardness testing method', the load is 10g, and the pressure maintaining time is 15s.
As can be seen from Table 1 below, comparing A1 with B1 yields B 4 The macro hardness of the material with the C content of 2 percent is improved by 14.5 percent relative to the common titanium-based alloy, the micro hardness is improved by 32 percent relative to the common titanium-based alloy (312HV0.1), and the wear rate is reduced by 26 percent relative to the common titanium-based alloy; when B is 4 When the content of C is excessive and reaches 3%, the hardness of a workpiece is reduced, the wear rate is increased, and the friction coefficient is increased (see B2 performance test data); bonding ofIn the tables A3 and A5, the hardness, the wear rate and the friction coefficient of the product are not changed greatly when the molding pressure reaches 1.7GPa and is increased continuously, and the density is kept at 96.0%. However, too fast a temperature rise rate in the sintering process will result in the titanium alloy matrix powder and B 4 C cannot react completely to generate enough reinforcing phases of TiB and TiC, so that the hardness and the wear rate of the part cannot be improved more, even because of B 4 C cannot bond with the titanium alloy matrix and thus reduces hardness and frictional properties. Therefore, the preparation method reasonably regulates and controls each parameter, improves the wear resistance of the titanium alloy material, obtains the high wear-resistant titanium alloy composite material, and expands the application range and the prospect of the titanium alloy composite material.
Table 1 results of performance testing
Figure SMS_1
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. The preparation method of the wear-resistant titanium alloy composite material is characterized by sequentially comprising the following steps of:
(S1) mixing materials: weighing m as mass 1 Titanium-based powder and mass m 2 And mixing them uniformly to obtain a composite material powder, wherein the mass m of the boron carbide particles 2 The total mass (m) of the composite material powder 1+ m 2 ) The percentage of (A) is 1-2%;
(S2) die pressing: carrying out compression molding on the composite material powder obtained in the step (S1) under the pressure of 1.5-2.0GPa to obtain a green body;
(S3) sintering: sintering the green body obtained in the step (S2) in an inert atmosphere, wherein the sintering process parameters are as follows: heating to 900-1100 ℃ at the speed of 3-5 ℃/min, preserving heat for 30-60min, heating to 1200-1300 ℃ at the speed of 2-3 ℃/min, preserving heat for 60-120min, and cooling to room temperature after sintering to obtain the wear-resistant titanium alloy composite material.
2. The method according to claim 1, wherein the titanium-based powder in the step (S1) has a particle diameter of 1 to 63 μm; the particle size of the boron carbide particles is 1-23 μm.
3. The method according to claim 1, wherein the titanium-based powder is at least one of Ti, TC4, TC8, TC9 and TA7 powder, and the titanium-based powder is irregularly shaped powder and has a particle size of 10 to 40 μm.
4. The method of claim 1, wherein the step (S1) of mixing is performed by mechanical mixing.
5. The preparation method according to claim 4, characterized in that the mixing in the step (S1) is carried out by using a ball mill, wherein the ball milling medium is agate balls, stainless steel balls or zirconia balls, the ball milling speed is 50-150r/min, and the ball milling time is 12-36h.
6. The method according to claim 1, wherein the mixing in the step (S1) is performed under an inert atmosphere without adding any auxiliary agent.
7. The method according to claim 1, wherein the step (S1) of weighing the titanium-based powder and the boron carbide particles is performed in a vacuum glove box.
8. The manufacturing method according to claim 1, wherein the pressure used for compression molding in the step (S2) is 1.6-1.9GPa.
9. The production method according to claim 1, wherein the sintering in the step (S3) is sintering in a tube furnace.
10. A wear-resistant titanium alloy composite material produced by the production method described in any one of claims 1 to 9.
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