A method for manufacturing low-cost, high-density titanium alloy products

Abstract

The present invention provides a method for manufacturing low-cost, high-density titanium alloy products. It utilizes coarse-grained titanium powder or titanium alloy powder with a D50 particle size of 20-25 μm as a raw material for metal powder injection molding, resulting in low cost. By mixing in copper powder with a D50 particle size of 8-10 μm, achieving a mass ratio of titanium powder or titanium alloy powder to copper powder of 90-99.9:10-0.1, the method leverages the low eutectoid transformation temperature and high solid solubility of copper to lower the phase transformation temperature of β-titanium alloy and refine its grain structure, resulting in a columnar crystal structure. The structure transforms into an equiaxed crystal structure, thereby increasing density, reducing porosity, and improving appearance. At the same time, due to the rapid diffusion of copper in titanium, a very fine eutectoid microstructure can be generated. When copper-containing high-temperature β-titanium alloys are cooled, a eutectoid reaction occurs to generate α-titanium alloys and compounds of TiCu2 and Ti2Cu. The solid solubility of copper in α-titanium alloys decreases significantly with decreasing temperature. Furthermore, TiCu2 has better thermal stability, and Ti2Cu has precipitation hardening effect, which can significantly improve the heat strengthening and hardness of the product.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy injection molding and sintering technology, and in particular to a method for manufacturing low-cost, high-density titanium alloy products. Background Technology

[0002] Titanium and titanium alloys have a series of advantages such as low density, high specific strength, corrosion resistance, good biocompatibility, and non-magnetic properties. They have very good application prospects in fields such as aircraft, rockets, missiles, artificial satellites, spacecraft, ships, military industry, light industry, chemical industry, textiles, medical industry, and petrochemical industry. They are an important and widely used metallic material.

[0003] However, due to the high reactivity of titanium, it is prone to violent reactions with impurity elements such as carbon (C), nitrogen (N), hydrogen (H), and oxygen (O) during traditional manufacturing processes such as casting, forging, and welding, forming ceramic phases such as TiC, TiN, and TiO2. The poor wettability between heterogeneous interfaces leads to a deterioration in the tensile strength and elongation of titanium and titanium alloy products, thus limiting their applications.

[0004] Metal Injection Molding (MIM) can circumvent this problem, but the titanium and titanium alloy powders currently used in MIM are mainly the fine powder fraction (particle size distribution D90 20-22um) screened from 3D printing powders, with a powder recovery rate far below 20%, resulting in high costs and making it difficult to meet the requirements of the development of MIM. If coarse-grained titanium and titanium alloy powders (particle size distribution D50 20-25um) are used, the powder recovery rate can be increased to 60%, which can significantly reduce powder costs. However, due to the coarse particle size, the density after sintering at 1120℃-1250℃ is relatively low (typically 4.2-4.3 g / cm³). 3 Furthermore, its porosity is as high as 5% or more, making it difficult to meet the requirements of high-density products.

[0005] To address the defects of low density and high porosity in coarse-grained titanium and titanium alloy powders after high-temperature sintering, current research focuses on adding low-melting-point metallic elements for liquid-phase sintering, such as aluminum (melting point 667℃) or silicon (melting point 1414℃). However, aluminum has high reactivity and readily reacts with oxygen and nitrogen in the TC4 (Ti6Al4V) material system to form aluminum oxide (Al2O3) and aluminum nitride (AlN), resulting in columnar crystal structures and causing surface defects in the product. Silicon (AlN) is a eutectoid alloying element, typically existing in alloys through substitutional solid solution and compound formation. In the Ti-Si system, the eutectoid temperature of titanium (Ti) and silicon (Si) is relatively high (860℃). Therefore, the amount of silicon added to the alloy should ideally not exceed the maximum solid solubility of the α phase, generally around 0.25%, which has a significant impact on product density. The improvement in porosity is limited. If the amount of silicon added exceeds the maximum solid solubility of the α phase, due to the large difference in atomic size between silicon and titanium, silicon tends to agglomerate at dislocation sites in the solid solution, hindering dislocation movement and thus improving heat resistance, requiring a higher sintering temperature. Studies have found that at 1340℃, the maximum solid solubility of silicon in α titanium alloy is 0.45%, and in β titanium alloy it is 3.0%. During high-temperature sintering, the difference in solid solubility of silicon in α titanium alloy and β titanium alloy is large. If the silicon distribution in β titanium alloy is uneven, it will segregate during subsequent cooling and phase transformation, forming a certain amount of silicides, such as Ti5Si3 (high-temperature phase, melting point 2130℃) and Ti3Si (low-temperature phase, melting point 1170℃), which have high melting points and are difficult to adapt to the high-temperature sintering of titanium and titanium alloy powders. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a low-cost, high-density titanium alloy product manufacturing method.

[0007] To achieve the above objectives, the present invention provides a method for manufacturing low-cost, high-density titanium alloy products, comprising the following steps:

[0008] S1. Mix titanium powder or titanium alloy powder with copper powder at a mass ratio of 90-99.9:10-0.1 to obtain powder A;

[0009] S2. The A powder and the polymer material are mixed at a weight ratio of 80-90:20-10, and then granulated by heating and pressurizing in an argon atmosphere to obtain a cylindrical feed of 3mm*5mm.

[0010] S3. The feed material is injection molded using a molding machine to obtain a green embryo;

[0011] S4. Degrease the green embryo to remove some of the polymer material from the green embryo and obtain a brown embryo;

[0012] S5. The brown blank is subjected to high-temperature sintering to remove the remaining polymer material and densify the brown blank. After cooling, a low-cost, high-density titanium-based alloy product is obtained.

[0013] In step S1, the D50 particle size of the titanium powder or titanium alloy powder is 20-25 μm, and the D50 particle size of the copper powder is 8-10 μm.

[0014] In step S2, the polymer material comprises 77-90% polyoxymethylene, 3-5% high-density polyethylene, 0.1-1% stearic acid, 0.1-1.0% vinyl bis-stearamide, 1-5% paraffin wax, 1-5% ethylene-vinyl acetate copolymer, 1-5% polypropylene, 0.1-0.5% antioxidant, and 0.1-0.5% activator.

[0015] In step S3, during injection, the nozzle temperature is 175-195℃ and the mold temperature is 100-130℃.

[0016] In step S4, degreasing refers to placing the green embryo in an oxalic acid catalytic degreasing furnace, using argon as a carrier, operating at 120°C, and performing acid injection catalytic degreasing at a degreasing rate of 1 mm / h. After removing the polyoxymethylene from the green embryo, the acid injection is stopped and the temperature is raised to 160°C, so that the molten island-shaped polymer material forms a thin film on the surface of the A powder by capillary force, thereby improving the strength of the brown embryo and preventing the infiltration of water molecules in the air.

[0017] In step S5, the high-temperature sintering is carried out in a metal heating furnace, the temperature of the high-temperature sintering is 1110 to 1250°C, and the mold shrinkage rate of the high-temperature sintering is 1.15 to 1.22.

[0018] Preferably, in step S5, the low-cost, high-density titanium-based alloy product contains α-titanium alloy, β-titanium alloy, and compounds of TiCu2 and Ti2Cu.

[0019] Preferably, in step S1, the titanium powder is α-titanium metal powder, the titanium powder includes TA2 and TA15, the titanium alloy powder is α+β titanium alloy powder, and the titanium alloy powder includes TC4.

[0020] Preferably, in step S1, the titanium powder or titanium alloy powder is a graded powder, and the D90 particle size of the titanium powder or titanium alloy powder is 20-75 μm.

[0021] Preferably, in step S1, the particle shape of the titanium powder or titanium alloy powder includes spherical, near-spherical, and polygonal shapes.

[0022] Preferably, in step S1, the copper powder is atomized copper powder or electrolytic copper powder, and the D90 particle size of the copper powder is 0.1 to 25 μm.

[0023] Preferably, in step S1, the mass ratio of the titanium powder or titanium alloy powder to the copper powder is 97-99:3-1.

[0024] Preferably, in step S5, the mold shrinkage rate of the high-temperature sintering is 1.15, 1.16, 1.165, 1.17, 1.18, 1.19, 1.20, 1.21, or 1.22.

[0025] Preferably, in step S5, the high-temperature sintering temperature is 1120℃ or 1200℃.

[0026] Preferably, in step S5, the density of the low-cost, high-density titanium-based alloy product is greater than or equal to 4.49 g / cm³. 3 The hardness is greater than or equal to 300 HV.

[0027] More preferably, in step S5, the density of the low-cost, high-density titanium-based alloy product is 4.49–4.75 g / cm³. 3 Its hardness is 300-380 HV.

[0028] More preferably, in step S5, the density of the low-cost, high-density titanium-based alloy product is 4.49 g / cm³. 3 4.50g / cm 3 4.51 g / cm 3 4.69 g / cm 3 4.75g / cm 3 The hardness is 300HV, 310HV, 320HV, 320HV, 330HV, 340HV, and 380HV.

[0029] More preferably, in step S5, the density of the low-cost, high-density titanium-based alloy product is 4.49 g / cm³. 3 The hardness is 300 HV, or the density of the low-cost, high-density titanium-based alloy product is 4.50 g / cm³. 3 The hardness is 310HV, or the density of the low-cost, high-density titanium-based alloy product is 4.49 g / cm³. 3 The hardness is 330HV, or the density of the low-cost, high-density titanium-based alloy product is 4.51 g / cm³. 3 The hardness is 350 HV, or the density of the low-cost, high-density titanium-based alloy product is 4.69 g / cm³. 3 The hardness is 320HV, or the density of the low-cost, high-density titanium-based alloy product is 4.75 g / cm³. 3The hardness is 350 HV, or the density of the low-cost, high-density titanium-based alloy product is 4.69 g / cm³. 3 The hardness is 340 HV, or the density of the low-cost, high-density titanium-based alloy product is 4.75 g / cm³. 3 Its hardness is 380HV.

[0030] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0031] The present invention provides a method for manufacturing low-cost, high-density titanium alloy products. It utilizes coarse-grained titanium powder or titanium alloy powder with a D50 particle size of 20-25 μm as a raw material for metal powder injection molding, resulting in low cost. By mixing in copper powder with a D50 particle size of 8-10 μm, achieving a mass ratio of titanium powder or titanium alloy powder to copper powder of 90-99.9:10-0.1, the method leverages the low eutectoid transformation temperature (approximately 792°C) and high solid solubility (approximately 2.1%) of copper to lower the phase transformation temperature of β-titanium alloy and refine its grains, transforming its columnar crystal structure into an equiaxed structure. The method improves the product density, reduces porosity, and enhances appearance by refining the crystalline structure. Simultaneously, due to the rapid diffusion of copper in titanium, a very fine eutectoid microstructure is generated. Upon cooling, the copper-containing high-temperature β-titanium alloy undergoes a eutectoid reaction to generate α-titanium alloy and compounds of TiCu2 and Ti2Cu. The solid solubility of copper in the α-titanium alloy decreases significantly with decreasing temperature. Furthermore, TiCu2 exhibits better thermal stability, and Ti2Cu has a precipitation hardening effect, significantly improving the product's heat resistance and hardness. This method is simple, convenient, yields high quality, and is easy to implement. Attached Figure Description

[0032] Figure 1 This is a comparison table of comparative examples and embodiments in this invention. Detailed Implementation

[0033] The method for manufacturing low-cost, high-density titanium alloy products provided by this invention includes the following steps:

[0034] S1. Mix titanium powder or titanium alloy powder with copper powder at a mass ratio of 90-99.9:10-0.1 to obtain powder A; the D50 particle size of the titanium powder or titanium alloy powder is 20-25 μm, and the D50 particle size of the copper powder is 8-10 μm.

[0035] S2. The A powder and the polymer material are mixed at a weight ratio of 80-90:20-10, and then granulated under heat and pressure in an argon atmosphere to obtain a cylindrical feedstock of 3mm*5mm; the polymer material includes 77-90% polyoxymethylene, 3-5% high-density polyethylene, 0.1-1% stearic acid, 0.1-1.0% vinyl bis-stearamide, 1-5% paraffin wax, 1-5% ethylene-vinyl acetate copolymer, 1-5% polypropylene, 0.1-0.5% antioxidant, and 0.1-0.5% activator;

[0036] S3. The feed material is injected into a molding machine to obtain a green preform; during injection, the nozzle temperature is 175-195℃ and the mold temperature is 100-130℃.

[0037] S4. Degrease the green embryo to remove some of the polymer material and obtain a brown embryo. Degreasing refers to placing the green embryo in an oxalic acid catalytic degreasing furnace, using argon as a carrier, operating at 120°C, and performing acid injection catalytic degreasing at a degreasing rate of 1 mm / h. After removing the polyoxymethylene from the green embryo, the acid injection is stopped and the temperature is raised to 160°C, so that the molten island-shaped polymer material forms a thin film on the surface of the A powder by capillary force, thereby improving the strength of the brown embryo and preventing the infiltration of water molecules in the air.

[0038] S5. The brown blank is subjected to high-temperature sintering to remove the remaining polymer material and densify the brown blank, thereby obtaining a low-cost, high-density titanium-based alloy product; the high-temperature sintering is carried out in a metal heating furnace, the high-temperature sintering temperature is 1110~1250℃, and the mold shrinkage rate of the high-temperature sintering is 1.15~1.22.

[0039] The advantages of this setup are twofold: it reduces costs by utilizing coarse titanium powder or titanium alloy powder with a D50 particle size of 20–25 μm, while simultaneously lowering the phase transformation temperature of β-titanium alloy and refining its grains by incorporating copper powder with a D50 particle size of 8–10 μm. This transforms its columnar crystal structure into an equiaxed crystal structure, thereby increasing product density, reducing porosity, and improving appearance. Furthermore, because copper diffuses rapidly in titanium, it produces a very fine eutectoid microstructure. Upon cooling, the copper-containing high-temperature β-titanium alloy undergoes a eutectoid reaction to generate α-titanium alloy and compounds of TiCu2 and Ti2Cu. The solid solubility of copper in α-titanium alloy decreases significantly with decreasing temperature, and TiCu2 exhibits better thermal stability while Ti2Cu has precipitation hardening effects, significantly improving the product's heat resistance and hardness. This makes the method simple, easy to operate, yields high quality, and is readily implementable.

[0040] Preferably, in step S1, the titanium powder is α-titanium metal powder, the titanium powder includes TA2 and TA15, the titanium alloy powder is α+β titanium alloy powder, and the titanium alloy powder includes TC4.

[0041] Preferably, in step S1, the titanium powder or titanium alloy powder is a graded powder, and the D90 particle size of the titanium powder or titanium alloy powder is 20-75 μm.

[0042] Preferably, in step S1, the particle shape of the titanium powder or titanium alloy powder includes spherical, near-spherical, and polygonal shapes.

[0043] Preferably, in step S1, the copper powder is atomized copper powder or electrolytic copper powder, and the D90 particle size of the copper powder is 0.1 to 25 μm.

[0044] Preferably, in step S1, the mass ratio of the titanium powder or titanium alloy powder to the copper powder is 97-99:3-1.

[0045] Preferably, in step S5, the mold shrinkage rate of the high-temperature sintering is 1.15, 1.16, 1.165, 1.17, 1.18, 1.19, 1.20, 1.21, or 1.22.

[0046] Preferably, in step S5, the high-temperature sintering temperature is 1120℃ or 1200℃.

[0047] Preferably, in step S5, the density of the low-cost, high-density titanium-based alloy product is greater than or equal to 4.49 g / cm³. 3 The hardness is greater than or equal to 300 HV.

[0048] More preferably, in step S5, the density of the low-cost, high-density titanium-based alloy product is 4.49–4.75 g / cm³. 3 Its hardness is 300-380 HV.

[0049] More preferably, in step S5, the density of the low-cost, high-density titanium-based alloy product is 4.49 g / cm³. 3 4.50g / cm 3 4.51 g / cm 3 4.69 g / cm 3 4.75g / cm 3 The hardness is 300HV, 310HV, 320HV, 320HV, 330HV, 340HV, and 380HV.

[0050] More preferably, in step S5, the density of the low-cost, high-density titanium-based alloy product is 4.49 g / cm³. 3The hardness is 300 HV, or the density of the low-cost, high-density titanium-based alloy product is 4.50 g / cm³. 3 The hardness is 310HV, or the density of the low-cost, high-density titanium-based alloy product is 4.49 g / cm³. 3 The hardness is 330HV, or the density of the low-cost, high-density titanium-based alloy product is 4.51 g / cm³. 3 The hardness is 350 HV, or the density of the low-cost, high-density titanium-based alloy product is 4.69 g / cm³. 3 The hardness is 320HV, or the density of the low-cost, high-density titanium-based alloy product is 4.75 g / cm³. 3 The hardness is 350 HV, or the density of the low-cost, high-density titanium-based alloy product is 4.69 g / cm³. 3 The hardness is 340 HV, or the density of the low-cost, high-density titanium-based alloy product is 4.75 g / cm³. 3 Its hardness is 380HV.

[0051] Compare with Example 1

[0052] TA2 titanium metal powder with a D50 particle size of 20-25 μm was used as feedstock with an unscalable shrinkage factor (OSF) of 1.18. The sample was then subjected to catalytic debinding and high-temperature sintering at 1120℃ under an argon atmosphere to obtain a density of 4.28 g / cm³. 3 Products with a hardness of 250HV.

[0053] Compare with Example 2

[0054] TA2 titanium metal powder with a D50 particle size of 20-25 μm was used as feedstock with an unscalable shrinkage factor (OSF) of 1.18. The sample was then subjected to catalytic debinding and high-temperature sintering at 1200℃ in an argon atmosphere to obtain a density of 4.30 g / cm³. 3 Products with a hardness of 280HV.

[0055] Compare with Example 3

[0056] TA2 titanium metal powder with a D50 particle size of 6-8 μm was used as feedstock with an OSF of 1.18. The sample was then subjected to catalytic debinding and high-temperature sintering at 1120℃ in an argon atmosphere to obtain a density of 4.50 g / cm³. 3 Products with a hardness of 255HV.

[0057] Compare with Example 4

[0058] TA2 titanium metal powder with a D50 particle size of 6-8 μm was used as feedstock with an OSF of 1.18. The sample was then subjected to catalytic debinding and high-temperature sintering at 1200℃ in an argon atmosphere to obtain a density of 4.51 g / cm³. 3Products with a hardness of 285HV.

[0059] Example 1

[0060] TA2 titanium powder with a D50 particle size of 20–25 μm and copper powder with a D50 particle size of 8–10 μm were fed at a weight ratio of 99:1 and an unscalable shrinkage factor (OSF) of 1.18. The sample was then subjected to catalytic debinding and high-temperature sintering at 1120 °C in an argon atmosphere to obtain a density of 4.49 g / cm³. 3 Products with a hardness of 300HV.

[0061] Example 2

[0062] TA2 titanium powder with a D50 particle size of 20–25 μm and copper powder with a D50 particle size of 8–10 μm were fed at a weight ratio of 99:1 and an unscalable shrinkage factor (OSF) of 1.18. The sample was then subjected to catalytic debinding and high-temperature sintering at 1200℃ in an argon atmosphere to obtain a density of 4.50 g / cm³. 3 The product has a hardness of 310HV.

[0063] Example 3

[0064] TC4 (Ti6Al4V) titanium powder with a D50 particle size of 20–25 μm and copper powder with a D50 particle size of 8–10 μm were fed at a weight ratio of 99:1 and an unscalable shrinkage factor (OSF) of 1.18. The sample was then catalytically degreased and sintered at 1120 °C in an argon atmosphere to obtain a density of 4.49 g / cm³. 3 The product has a hardness of 330HV.

[0065] Example 4

[0066] TC4 (Ti6Al4V) titanium powder with a D50 particle size of 20–25 μm and copper powder with a D50 particle size of 8–10 μm were fed at a weight ratio of 99:1 and an unscalable shrinkage factor (OSF) of 1.18. The sample was then catalytically degreased and sintered at 1200℃ in an argon atmosphere to obtain a density of 4.51 g / cm³. 3 Products with a hardness of 350HV.

[0067] Example 5

[0068] TA2 titanium powder with a D50 particle size of 20–25 μm and copper powder with a D50 particle size of 8–10 μm were fed at a weight ratio of 97:3 and an unscalable shrinkage factor (OSF) of 1.18. The sample was then subjected to catalytic debinding and high-temperature sintering at 1120 °C in an argon atmosphere to obtain a density of 4.69 g / cm³. 3 Products with a hardness of 320HV.

[0069] Example 6

[0070] TA2 titanium powder with a D50 particle size of 20–25 μm and copper powder with a D50 particle size of 8–10 μm were fed at a weight ratio of 97:3 and an unscalable shrinkage factor (OSF) of 1.18. The sample was then subjected to catalytic debinding and high-temperature sintering at 1200℃ in an argon atmosphere to obtain a density of 4.75 g / cm³. 3 Products with a hardness of 350HV.

[0071] Example 7

[0072] TC4 (Ti6Al4V) titanium powder with a D50 particle size of 20–25 μm and copper powder with a D50 particle size of 8–10 μm were fed at a weight ratio of 99:1 and an unscalable shrinkage factor (OSF) of 1.18. The sample was then catalytically degreased and sintered at 1120 °C in an argon atmosphere to obtain a density of 4.69 g / cm³. 3 Products with a hardness of 340HV.

[0073] Example 8

[0074] TC4 (Ti6Al4V) titanium powder with a D50 particle size of 20–25 μm and copper powder with a D50 particle size of 8–10 μm were fed at a weight ratio of 97:3 and an unscalable shrinkage factor (OSF) of 1.18. The sample was then catalytically degreased and sintered at 1200℃ in an argon atmosphere to obtain a density of 4.75 g / cm³. 3 Products with a hardness of 380HV.

[0075] It should be noted that in this invention, all HV refers to HV0.5, that is, the load applied during the test is 500 grams.

[0076] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1.A method for manufacturing a low-cost high-density titanium alloy product, comprising the following steps: S1. mixing titanium powder or titanium alloy powder with copper powder in a mass ratio of 90-99.9:10-0.1 to obtain A powder; S2. mixing the A powder with a polymer material in a weight ratio of 80-90:20-10, and then performing warm and pressurized compaction granulation in an argon environment to obtain a 3mm*5mm cylindrical feedstock; S3. injecting the feedstock through a molding machine to obtain a green body, wherein the temperature of a nozzle during injection is 175-195℃, and the temperature of a mold is 100-130℃; S4. performing debinding on the green body to remove part of the polymer material in the green body and obtain a brown body; S5. performing high-temperature sintering on the brown body to remove the remaining polymer material and densify the brown body, thereby obtaining a low-cost high-density titanium-based alloy product with a density of greater than or equal to 4.49g / cm3 and a hardness of greater than or equal to 300HV, wherein the high-temperature sintering is performed in a metal heating furnace at a temperature of 1110-1250℃, and the mold shrinkage rate is 1.15-1.22; characterized in that: in step S1, the titanium powder or titanium alloy powder is a graded powder, the D50 particle size of the titanium powder or titanium alloy powder is 20-25um, and the D90 particle size is 20-75um, the copper powder is atomized copper powder or electrolytic copper powder, the D50 particle size of the copper powder is 8-10um, and the D90 particle size is 0.1-25um; in step S2, the polymer material comprises polyformaldehyde in a mass ratio of 77-90%, high-density polyethylene in a mass ratio of 3-5%, stearic acid in a mass ratio of 0.1-1%, vinyl bis-stearamide in a mass ratio of 0.1-1.0%, paraffin in a mass ratio of 1-5%, ethylene-vinyl acetate copolymer in a mass ratio of 1-5%, polypropylene in a mass ratio of 1-5%, an antioxidant in a mass ratio of 0.1-0.5%, and an active agent in a mass ratio of 0.1-0.5%; in step S4, the debinding refers to placing the green body in an oxalic acid catalytic debinding furnace, using argon as a carrier, setting the working temperature at 120℃, and performing acid injection catalytic debinding at a debinding rate of 1mm / h, wherein after the polyformaldehyde in the green body is removed, the acid injection is stopped and the temperature is raised to 160℃, so that the molten island-shaped polymer material forms a film on the surface of the A powder by capillary force, thereby improving the strength of the brown body and avoiding the infiltration of water molecules in the air; in step S1, the titanium powder is an α titanium metal powder, and the titanium powder comprises TA2 and TA15, and the titanium alloy powder is an α+β titanium alloy powder, and the titanium alloy powder comprises TC4; in step S1, the mass ratio of the titanium powder or titanium alloy powder to the copper powder is 97-99:3-1; in step S5, the mold shrinkage rate of the high-temperature sintering is 1.15, 1.16, 1.165, 1.17, 1.18, 1.19, 1.20, 1.21, 1.22; the temperature of the high-temperature sintering is 1120℃ or 1200℃; in step S5, the density of the low-cost high-density titanium-based alloy product is 4.49-4.75g / cm3, and the hardness is 300-380HV. ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The method of making a low cost high density titanium alloy product of claim 1, wherein: ​ 3. The method of making a low cost high density titanium alloy product of claim 1, wherein: ​ 4. The method of making a low cost, high density titanium alloy product of claim 1, wherein: ​ 5. The method of making a low cost, high density titanium alloy product of claim 1, wherein: ​ 6. The method of making a low cost, high density titanium alloy product of claim 1, wherein: ​

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