A high-damping copper-titanium alloy, its preparation method and application

Abstract

This invention relates to the field of metallurgical technology, specifically to a high-damping copper-titanium alloy, its preparation method, and its applications. The preparation method of the high-damping copper-titanium alloy includes: mixing and grinding Cu powder and Ti powder in a mass ratio of 45–95:5–55 until the average particle size is ≤35 μm, followed by cold pressing to obtain an alloy billet; the billet is melted at 1300–1500℃ and then cast, followed by cooling at a rate of 30–60℃ / min to obtain the high-damping copper-titanium alloy. This preparation method can improve mechanical properties and damping performance. This invention also provides a high-damping copper-titanium alloy, mainly obtained by the preparation method of high-damping copper-titanium alloy; the high-damping copper-titanium alloy is composed of Cu 45%–95% and Ti 5%–55% by mass percentage; the high-damping copper-titanium alloy has a damping peak value Q. ‑1 max ≥0.07. This invention also provides the application of high-damping copper-titanium alloys in mechanical equipment.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and more specifically, to a high-damping copper-titanium alloy, its preparation method, and its application. Background Technology

[0002] With the development of society, mechanical equipment is gradually developing towards high efficiency, high speed and automation. As a result, the problems of mechanical vibration, noise and fatigue damage are becoming increasingly prominent. Usually, noise occurs together with vibration. These two not only easily cause damage to mechanical structures, reduce the life of mechanical parts, reduce the precision of processing, and reduce the concealment of equipment, but also affect the comfort of human production and life. Therefore, it is necessary to adopt appropriate methods to reduce vibration and noise: (1) increase mass, improve rigidity and reduce resonance amplitude; (2) avoid resonance points; (3) attenuate vibration. In engineering, many methods and measures have been studied and developed to solve vibration and noise problems. Compared with traditional methods such as increasing rigidity and improving structural design, the use of high damping materials can fundamentally reduce vibration and noise without increasing the mass of equipment and the complexity of system structure. It is a very convenient and practical vibration and noise reduction control measure. Moreover, damping alloy materials have good mechanical properties. Under working conditions with high requirements for mechanical properties, damping alloy materials can show certain advantages. They can usually remain stable over a wide range of temperatures and frequencies.

[0003] However, with the continuous development of technology, the requirements for damping materials are getting higher and higher, especially the mechanical properties of damping alloys need to be further improved. In addition, conventional damping alloys have insufficient service stability and low service temperature. Among them, the maximum service temperature of multiphase alloys is about 150℃, the maximum service temperature of twinned alloys is 80℃, and the maximum service temperature of dislocation alloys is 150℃.

[0004] Therefore, it is of great significance to provide a copper-titanium alloy with high comprehensive mechanical properties and high damping performance.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The first objective of this invention is to provide a method for preparing a high-damping copper-titanium alloy, which can produce a multiphase copper-titanium alloy that simultaneously possesses excellent mechanical properties and high damping properties.

[0007] The second objective of this invention is to provide a high-damping copper-titanium alloy, which not only possesses excellent comprehensive mechanical properties such as high strength, high hardness, and good toughness, but also has high damping performance.

[0008] A third objective of this invention is to provide the application of high-damping copper-titanium alloys in mechanical equipment.

[0009] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

[0010] This invention provides a method for preparing a high-damping copper-titanium alloy, comprising the following steps:

[0011] Cu powder and Ti powder with a mass ratio of 45-95:5-55 are mixed and ground until the average particle size is ≤35μm, and then cold-pressed to obtain an alloy billet;

[0012] The billet is melted at 1300-1500℃, then cast and cooled at a rate of 30-60℃ / min to obtain the high-damping copper-titanium alloy.

[0013] The present invention also provides a high-damping copper-titanium alloy, which is mainly prepared by the high-damping copper-titanium alloy preparation method described above;

[0014] The high-damping copper-titanium alloy is composed of 45%–95% Cu and 5%–55% Ti by mass percentage.

[0015] The high-damping copper-titanium alloy has a peak damping Q. -1 max ≥0.07.

[0016] This invention also provides the application of high-damping copper-titanium alloys in mechanical equipment.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) The copper-titanium alloy prepared by the method of preparing high-damping copper-titanium alloy provided by the present invention not only has excellent comprehensive mechanical properties, but also has high damping properties.

[0019] (2) The preparation method provided by the present invention also has the advantages of short preparation time, high efficiency, safe and pollution-free preparation process, and more uniform distribution of copper-titanium alloy structure.

[0020] (3) The high-damping copper-titanium alloy provided by the present invention has high damping performance, wherein the damping peak value Q -1 max ≥0.07, suitable for vibration damping applications at higher temperatures. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 XRD pattern of the high-damping copper-titanium alloy prepared in Example 1 of this invention;

[0023] Figure 2 A schematic diagram of the damping performance curve of the high-damping copper-titanium alloy prepared in Example 1 of the present invention;

[0024] Figure 3 XRD pattern of the high-damping copper-titanium alloy prepared in Example 2 of this invention;

[0025] Figure 4 A schematic diagram of the damping performance curve of the high-damping copper-titanium alloy prepared in Example 2 of the present invention;

[0026] Figure 5 XRD pattern of the high-damping copper-titanium alloy prepared in Example 3 of this invention;

[0027] Figure 6 A schematic diagram of the damping performance curve of the high-damping copper-titanium alloy prepared in Example 3 of the present invention;

[0028] Figure 7 XRD pattern of the high-damping copper-titanium alloy prepared in Example 4 of this invention;

[0029] Figure 8 A schematic diagram of the damping performance curve of the high-damping copper-titanium alloy prepared in Example 4 of the present invention.

[0030] Figure 9 A schematic diagram of the damping performance curve of the high-damping copper-titanium alloy prepared in Example 5 of the present invention;

[0031] Figure 10 A schematic diagram of the damping performance curve of the high-damping copper-titanium alloy prepared in Example 6 of the present invention;

[0032] Figure 11 A schematic diagram of the damping performance curve of the copper-titanium alloy prepared in Comparative Example 1 provided for the present invention.

[0033] Figure 12 A schematic diagram of the damping performance curve of the copper-titanium alloy prepared in Comparative Example 2 provided for the present invention.

[0034] Figure 13 A schematic diagram of the damping performance curve of the copper-titanium alloy prepared in Comparative Example 3 for the present invention. Detailed Implementation

[0035] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0036] In a first aspect, the present invention provides a method for preparing a high-damping copper-titanium alloy, comprising the following steps:

[0037] Cu powder and Ti powder are mixed and ground in a mass ratio of 45 to 95 (including but not limited to the point values ​​of any one of 50, 55, 60, 65, 70, 75, 80, 85, 90 or any range between two) to 5 to 55 (including but not limited to the point values ​​of any one of 10, 15, 20, 25, 30, 35, 40, 45, 50 or any range between two). After grinding until the average particle size of the material is ≤35μm, it is cold-pressed to obtain an alloy billet.

[0038] Among them, the average particle size is ≤35μm, including but not limited to the point value of any one of 33μm, 30μm, 25μm, 23μm, 20μm, 15μm, 10μm, 5μm, 1μm or any range between two of them.

[0039] The billet obtained above is then melted at 1300-1500°C, then cast, and cooled at a cooling rate of 30-60°C / min to obtain a high-damping copper-titanium alloy.

[0040] The melting temperature of 1300-1500℃ includes, but is not limited to, any one of 1350℃, 1400℃, 1450℃, and 1480℃, or any range between two of them.

[0041] The cooling rate of 30 to 60℃ / min includes, but is not limited to, any one of 35℃ / min, 40℃ / min, 45℃ / min, 50℃ / min, and 55℃ / min, or any range between two of them.

[0042] The method for preparing high-damping copper-titanium alloy provided by this invention can produce high-damping copper-titanium alloy with excellent comprehensive mechanical properties and high damping performance.

[0043] The high-damping copper-titanium alloy prepared by this invention is a multiphase damping alloy. The multiphase damping alloy dissipates the vibration energy brought by stress as frictional heat by the micro-elastic deformation of the matrix structure under stress and the plastic flow or phase transformation of the second phase along the grain boundary. This achieves the purpose of improving the damping performance of the alloy.

[0044] Specifically, the present invention improves the damping and mechanical properties of the prepared copper-titanium alloy by using Cu powder and Ti powder with a specific mass ratio, mixing and grinding Cu powder and Ti powder to a specific particle size, performing melting treatment at a specific temperature, and cooling at a specific cooling rate.

[0045] More specifically, this invention improves the mechanical properties of copper-titanium alloys by controlling the mass ratio of Cu powder to Ti powder to be 45-95:5-55 and by employing a specific preparation method.

[0046] Meanwhile, by controlling the average particle size of the mixed Cu and Ti powders to be ≤35μm after grinding, the interfacial area of ​​the material is increased, improving interfacial torsion and interfacial slip. This effectively absorbs and dissipates strain energy in the material, thereby enhancing the damping performance of the copper-titanium alloy. Furthermore, the smaller powder particle size promotes solid-state diffusion and grain boundary migration, leading to a reduction in grain size and an increase in lattice defects, further improving the damping performance of the copper-titanium alloy.

[0047] Furthermore, by employing a specific melting temperature, this invention achieves two advantages: firstly, at higher liquid-solid reaction temperatures, the grain size of the solid metal (Ti atoms) decreases, resulting in larger grain boundary areas and providing more possibilities for the generation and movement of dislocations; secondly, higher liquid-solid reaction temperatures increase the lattice vibration energy of the solid metal, making existing dislocations easier to move and generating new dislocations. This increase in dislocations improves the damping performance of the alloy to some extent.

[0048] Furthermore, this invention employs a specific cooling rate during the casting process. The rapid cooling prevents atoms from diffusing quickly enough, causing the liquid metal in the alloy to solidify more rapidly, forming smaller grains and increasing the number of grain boundaries. The faster the solidification process, the easier it is to form high-density defects such as dislocations and twins, resulting in a smaller grain size in the resulting Cu-Ti alloy. This smaller grain size leads to a higher grain boundary density. When external forces are applied to the copper-titanium alloy, the grain boundaries, dislocations, twins, and other defects bear some of the shear stress, consuming energy and thus improving the alloy's damping performance.

[0049] In addition, the preparation method provided by the present invention has the advantages of short preparation time, high efficiency, safe and pollution-free preparation process, guaranteed repeatability, and more uniform distribution of copper-titanium alloy microstructure.

[0050] Preferably, the Cu powder comprises gas-atomized Cu powder, and the Ti powder comprises gas-atomized Ti powder.

[0051] By using gas-atomized Cu powder and gas-atomized Ti powder, the particle shape and size are more uniform, which is beneficial to improving damping performance.

[0052] In some specific embodiments of the present invention, the purity of the gas-atomized Cu powder is ≥99.9%, and the purity of the gas-atomized Ti powder is ≥99.9%.

[0053] In some specific embodiments of the present invention, the grinding time is 2 to 6 hours.

[0054] In some specific embodiments of the present invention, the grinding includes wet grinding. Preferably, after the wet grinding, a drying step is further included.

[0055] Preferably, the average particle size of the Cu powder is 250-400 mesh, including but not limited to the value of any one of 270 mesh, 300 mesh, 325 mesh, 350 mesh, and 380 mesh, or a range between any two; and the average particle size of the Ti powder is 250-400 mesh, including but not limited to the value of any one of 270 mesh, 300 mesh, 325 mesh, 350 mesh, and 380 mesh, or a range between any two.

[0056] Using Cu and Ti powders within the aforementioned particle size range facilitates subsequent grinding to an average particle size ≤35μm, and also reduces costs.

[0057] More preferably, the Cu powder has a particle size of 325-400 mesh, and the Ti powder has a particle size of 325-400 mesh.

[0058] Preferably, the cold pressing pressure is 40-80 MPa, including but not limited to any one of 45 MPa, 50 MPa, 55 MPa, 60 MPa, 65 MPa, 70 MPa, and 75 MPa, or a range between any two; and the holding time of the cold pressing is 30-60 seconds, including but not limited to any one of 35 seconds, 40 seconds, 45 seconds, 50 seconds, and 55 seconds, or a range between any two.

[0059] Preferably, the melting process is carried out in an inert atmosphere, and the vacuum degree of the melting process is ≤10. -2 Pa.

[0060] In some specific embodiments of the present invention, the inert atmosphere includes a nitrogen atmosphere and / or an argon atmosphere.

[0061] Preferably, the melting process is carried out in an induction melting furnace.

[0062] In some specific embodiments of the present invention, the frequency of the induction melting furnace is 2000 to 5000 Hz, including but not limited to the point value of any one of 3000 Hz and 4000 Hz or the range value between any two.

[0063] Induction melting furnaces can provide higher melting temperatures and faster cooling rates, which helps to improve damping performance.

[0064] Preferably, the holding time for the melting treatment is 30 to 60 minutes, including but not limited to a value of 40 minutes or 50 minutes, or a range between the two.

[0065] In some specific embodiments of the present invention, the cooling method includes water cooling.

[0066] In some specific embodiments of the invention, the casting and cooling are carried out in an induction melting furnace to provide a sufficiently large cooling rate.

[0067] Secondly, the present invention provides a high-damping copper-titanium alloy, which is mainly prepared by the high-damping copper-titanium alloy preparation method described above.

[0068] The high-damping copper-titanium alloy is composed of Cu 45% to 95% by mass percentage (including but not limited to any one of 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% or any range between any two) and Ti 5% to 55% by mass percentage (including but not limited to any one of 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% or any range between any two).

[0069] The high-damping copper-titanium alloy has a peak damping Q. -1 max ≥0.07, including but not limited to point values ​​of any one of 0.07, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, and 0.16, or range values ​​between any two, preferably ≥0.09.

[0070] Understandably, the peak damping Q -1 max It refers to the highest damping value of a specific copper-titanium alloy at different temperatures.

[0071] The high-damping copper-titanium alloy provided by this invention has high damping performance, with a peak damping value Q. -1 maxWith a strength ≥0.07, it is suitable for applications requiring high-temperature vibration damping. Furthermore, the high-damping copper-titanium alloy provided by this invention exhibits a uniform microstructure and excellent mechanical properties.

[0072] Preferably, the high-damping copper-titanium alloy has a damping peak value Q. -1 max ≥0.14.

[0073] In some specific embodiments of the present invention, the damping relaxation peak temperature of the high-damping copper-titanium alloy is ≥220℃, including but not limited to any one of 230℃, 240℃, 250℃, 260℃, 280℃, 300℃, 320℃, 330℃, 340℃, and 35℃, or a range between any two, preferably ≥320℃.

[0074] In some specific embodiments of the present invention, the multiphase composition of the high-damping copper-titanium alloy includes at least two of the following: Cu4Ti phase, Cu2Ti phase, Cu4Ti3 phase, Cu3Ti2 phase, and Cu phase.

[0075] Thirdly, the present invention provides the application of the high-damping copper-titanium alloy prepared by the above-described method in mechanical equipment.

[0076] In some specific embodiments of the present invention, the mechanical equipment includes at least one of high-speed trains, automobiles, instruments, robot joints, screws, washers, submarine propellers, rock drill bits, ball bearings, garbage shredders, circular saws, submarine propellers, and structural components, but is not limited thereto.

[0077] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0078] Example 1

[0079] The method for preparing the high-damping copper-titanium alloy provided in this embodiment includes the following steps:

[0080] Atomized Cu powder and atomized Ti powder were weighed in a mass ratio of 79.93:20.07, with both having an average particle size of 325 mesh and a purity of 99.9%. The atomized Cu and Ti powders were then mixed in an agate mortar, and an appropriate amount of ethanol was added. The mixture was thoroughly ground until the average particle size reached 30 μm, and then dried in a vacuum drying oven. The dried powder mixture was then cold-pressed using a hydraulic press at a pressure of 50 MPa for 30 seconds to complete the blanking process and obtain the alloy blank.

[0081] The alloy billet obtained above was placed in a yttrium oxide-stabilized calcium oxide crucible, and the crucible was placed in an induction melting furnace (the frequency of the induction melting furnace was 3000 Hz). The induction melting furnace was evacuated to a vacuum degree ≤10. -2 Under dynamic protection of argon gas, the temperature is raised to 1400℃ for melting treatment, so that the alloy billet in the furnace is melted into liquid. After holding at this temperature for 30 minutes, the molten metal is poured into a mold and water-cooled at a cooling rate of 40℃ / min (both casting and cooling are carried out in an induction melting furnace). After cooling to room temperature, the alloy ingot is taken out, which is the high-damping copper-titanium alloy.

[0082] The high-damping copper-titanium alloy prepared in this embodiment consists of 79.93% Cu and 20.07% Ti by mass percentage. The XRD pattern of the high-damping copper-titanium alloy prepared in this embodiment is shown below. Figure 1 It can be seen that the multiphase composition of the high-damping copper-titanium alloy prepared in this embodiment is: Cu4Ti phase and Cu2Ti phase.

[0083] The high-damping copper-titanium alloy prepared in this embodiment was subjected to damping performance testing, and the results are as follows: Figure 2 As shown in the figure, the peak damping value Q of the high-damping copper-titanium alloy prepared in this embodiment is... -1 max The value is 0.09, and its damping relaxation peak temperature is about 240℃, indicating that this high-damping copper-titanium alloy can be used in high-temperature vibration reduction applications.

[0084] Example 2

[0085] The preparation method of the high-damping copper-titanium alloy provided in this embodiment is basically the same as that in Example 1, except that the mass ratio of gas-atomized Cu powder to gas-atomized Ti powder is replaced with 75.59:24.41.

[0086] The high-damping copper-titanium alloy prepared in this embodiment consists of 75.59% Cu and 24.41% Ti by mass percentage. The XRD pattern of the high-damping copper-titanium alloy prepared in this embodiment is shown below. Figure 3It can be seen that the multiphase composition of the high-damping copper-titanium alloy prepared in this embodiment is: Cu4Ti phase, Cu4Ti3 phase and Cu3Ti2 phase.

[0087] The high-damping copper-titanium alloy prepared in this embodiment was subjected to damping performance testing, and the results are as follows: Figure 4 As shown in the figure, the peak damping value Q of the high-damping copper-titanium alloy prepared in this embodiment is... -1 max The value is 0.14, and its damping relaxation peak temperature is about 350℃, indicating that this high-damping copper-titanium alloy can be used in high-temperature vibration reduction applications.

[0088] Example 3

[0089] The preparation method of the high-damping copper-titanium alloy provided in this embodiment is basically the same as that in Example 1, except that the mass ratio of gas-atomized Cu powder to gas-atomized Ti powder is replaced with 46.94:53.06.

[0090] The high-damping copper-titanium alloy prepared in this embodiment consists of 46.94% Cu and 53.06% Ti by mass percentage. The XRD pattern of the high-damping copper-titanium alloy prepared in this embodiment is shown in [reference needed]. Figure 5 As can be seen, the multiphase composition of the high-damping copper-titanium alloy prepared in this embodiment is: CuTi phase and CuTi2 phase.

[0091] The high-damping copper-titanium alloy prepared in this embodiment was subjected to damping performance testing, and the results are as follows: Figure 6 As shown in the figure, the peak damping value Q of the high-damping copper-titanium alloy prepared in this embodiment is... -1 max The value is 0.07, and its damping relaxation peak temperature is about 280℃, indicating that this high-damping copper-titanium alloy can be used in high-temperature vibration reduction applications.

[0092] Example 4

[0093] The preparation method of the high-damping copper-titanium alloy provided in this embodiment is basically the same as that in Example 1, except that the mass ratio of gas-atomized Cu powder to gas-atomized Ti powder is replaced with 88.26:11.74.

[0094] The high-damping copper-titanium alloy prepared in this embodiment consists of 88.26% Cu and 11.74% Ti by mass percentage. The XRD pattern of the high-damping copper-titanium alloy prepared in this embodiment is shown below. Figure 7 As can be seen, the multiphase composition of the high-damping copper-titanium alloy prepared in this embodiment is: Cu phase and Cu4Ti phase.

[0095] The high-damping copper-titanium alloy prepared in this embodiment was subjected to damping performance testing, and the results are as follows: Figure 8As shown in the figure, the peak damping value Q of the high-damping copper-titanium alloy prepared in this embodiment is... -1 max The value is 0.08, and its damping relaxation peak temperature is about 270℃, indicating that this high-damping copper-titanium alloy can be used in high-temperature vibration reduction applications.

[0096] Example 5

[0097] The preparation method of the high-damping copper-titanium alloy provided in this embodiment is basically the same as that in Example 1, except that the melting temperature is replaced with 1500℃. The multiphase composition of the high-damping copper-titanium alloy obtained in this embodiment is: Cu4Ti phase and Cu2Ti phase.

[0098] The high-damping copper-titanium alloy prepared in this embodiment was subjected to damping performance testing, and the results are as follows: Figure 9 As shown in the figure, the peak damping value Q of the high-damping copper-titanium alloy prepared in this embodiment is... -1 max The value is 0.09, and its damping relaxation peak temperature is about 240℃, indicating that this high-damping copper-titanium alloy can be used in high-temperature vibration reduction applications.

[0099] Example 6

[0100] The preparation method of the high-damping copper-titanium alloy provided in this embodiment is basically the same as that in Example 1, except that the water cooling rate is replaced with 55℃ / min. The multiphase composition of the high-damping copper-titanium alloy obtained in this embodiment is: Cu4Ti phase and Cu2Ti phase.

[0101] The high-damping copper-titanium alloy prepared in this embodiment was subjected to damping performance testing, and the results are as follows: Figure 10 As shown in the figure, the peak damping value Q of the high-damping copper-titanium alloy prepared in this embodiment is... -1 max The value is 0.09, and its damping relaxation peak temperature is about 240℃, indicating that this high-damping copper-titanium alloy can be used in high-temperature vibration reduction applications.

[0102] Comparative Example 1

[0103] The preparation method of the copper-titanium alloy provided in this comparative example is basically the same as that in Example 1, except that: the gas-atomized Cu powder is replaced with Cu powder (non-gas-atomized powder) with an average particle size of 200 mesh and a purity of 99.5%, and the gas-atomized Ti powder is replaced with Ti powder (non-gas-atomized powder) with an average particle size of 200 mesh and a purity of 99.5%. Furthermore, the grinding step is omitted; that is, the Cu powder and Ti powder are directly mixed and stirred evenly before cold pressing. The multiphase composition of the copper-titanium alloy obtained in this comparative example is: Cu4Ti phase and Cu2Ti phase.

[0104] The damping performance of the copper-titanium alloy prepared in this comparative example was tested, and the results are as follows: Figure 11 As shown, the peak damping value Q of the copper-titanium alloy prepared in this comparative example is... -1 max The value is 0.066, which is significantly lower than the damping peak value Q in Example 1. -1 max Therefore, the present invention can improve damping performance by grinding the raw materials to an average particle size of less than 35 μm.

[0105] Comparative Example 2

[0106] The preparation method of the copper-titanium alloy provided in this comparative example is basically the same as that in Example 1, except that the induction melting furnace is replaced with a vacuum resistance furnace, and the alloy is cooled to room temperature by circulating water at a cooling rate of 10°C / min. The multiphase composition of the copper-titanium alloy obtained in this comparative example is Cu4Ti phase and Cu2Ti phase.

[0107] The damping performance of the copper-titanium alloy prepared in this comparative example was tested, and the results are as follows: Figure 12 As shown, the peak damping value Q of the copper-titanium alloy prepared in this comparative example is... -1 max The value is 0.045, which is significantly lower than the damping peak value Q in Example 1. -1 max Therefore, this invention can improve the damping performance of copper-titanium alloys by using a specific cooling rate during the casting process.

[0108] Comparative Example 3

[0109] The preparation method of the copper-titanium alloy provided in this comparative example is basically the same as that in Example 1, except that the melting temperature is replaced with 1100℃. The multiphase composition of the copper-titanium alloy obtained in this comparative example is Cu4Ti phase and Cu2Ti phase.

[0110] The damping performance of the copper-titanium alloy prepared in this comparative example was tested, and the results are as follows: Figure 13 As shown, the peak damping value Q of the copper-titanium alloy prepared in this comparative example is... -1 max The value is 0.048, which is significantly lower than the damping peak value Q in Example 1. -1 max Therefore, the present invention can improve the damping performance of copper-titanium alloys by performing a melting treatment at a specific temperature.

[0111] Experimental Example 1

[0112] The hardness and impact toughness of the copper-titanium alloys prepared in each of the above embodiments and comparative examples were tested, and the test results are shown in Table 1 below.

[0113] Table 1. Results of Hardness and Toughness Tests

[0114] Group hardness Impact toughness Example 1 234HV <![CDATA[33J / cm 2 ]]> Example 2 256HV <![CDATA[28J / cm 2 ]]> Example 3 674HV <![CDATA[13J / cm 2 ]]> Example 4 318HV <![CDATA[24J / cm 2 ]]> Example 5 227HV <![CDATA[31J / cm 2 ]]> Example 6 224HV <![CDATA[32J / cm 2 ]]> Comparative Example 1 219HV <![CDATA[29J / cm 2 ]]> Comparative Example 2 216HV <![CDATA[29J / cm 2 ]]> Comparative Example 3 218HV <![CDATA[30J / cm 2 ]]>

[0115] As can be seen from Table 1, compared with Comparative Examples 1 to 3, the high-damping copper-titanium alloy prepared in Example 1 has better overall mechanical properties. It can be seen that the high-damping copper-titanium alloy with specific chemical composition provided by the present invention can significantly improve mechanical properties.

[0116] Although the present invention has been illustrated and described with specific embodiments, it should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, without departing from the spirit and scope of the present invention; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such substitutions and modifications that fall within the scope of the present invention are included in the appended claims.

Claims

1. A method of producing a high damping copper-titanium alloy, characterized by, Comprising the following steps: Cu powder and Ti powder with a mass ratio of 45-95:5-55 are mixed and ground to an average particle size of ≤35 μm, then cold-pressed to form an alloy blank; The blank is subjected to melting treatment at 1300-1500 ℃, then cast and cooled at a cooling rate of 30-60 ℃ / min to obtain the high-damping copper-titanium alloy.

2. The method of claim 1, wherein the high damping copper-titanium alloy is prepared by the steps of: The Cu powder is gas-atomized Cu powder, and the Ti powder is gas-atomized Ti powder.

3. The method for preparing the high-damping copper-titanium alloy according to claim 1, characterized in that, The average particle size of the Cu powder is 250-400 mesh, and the average particle size of the Ti powder is 250-400 mesh.

4. The method of claim 1, wherein the high damping copper-titanium alloy is prepared by the steps of: The pressure of the cold-pressing is 40-80 MPa, and the pressure holding time of the cold-pressing is 30-60 s.

5. The method for preparing the high-damping copper-titanium alloy according to claim 1, characterized in that, The melting treatment is carried out in an inert atmosphere, and the vacuum degree of the melting treatment is ≤ 10 -2 Pa.

6. The method of claim 1, wherein the high damping copper-titanium alloy is prepared by the steps of: The melting treatment is performed in an induction melting furnace.

7. The method for preparing the high-damping copper-titanium alloy according to claim 1, characterized in that, The holding time of the melting treatment is 30-60 min.

8. A high damping copper-titanium alloy characterized by, obtained from the preparation method of the high-damping copper-titanium alloy according to any one of claims 1-7; The high-damping copper-titanium alloy is composed of Cu 45%-95% and Ti 5%-55% by mass percentage; The high damping copper-titanium alloy has a damping peak value Q -1 max ≥0.

07.

9. The high-damping copper-titanium alloy of claim 8, wherein, The high damping copper-titanium alloy has a damping peak value Q -1 max ≥0.

14.

10. Application of the high-damping copper-titanium alloy obtained from the preparation method of the high-damping copper-titanium alloy according to any one of claims 1-7 in mechanical equipment.

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