Method for preparing high-performance injection molding titanium alloy product by adding oxygen absorbent

Abstract

The invention discloses a method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorbent, which comprises the following steps of: 1, ball-milling titanium alloy spherical powder and YB6 powder to obtain mixed powder; 2, the mixed powder and a binder are subjected to banburying and granulation, and granular injection molding titanium alloy product feed is obtained; thirdly, the feed is injected into a mold, and an injection-molded titanium alloy product green body is obtained; 4, performing catalytic degreasing on the green body to obtain a degreased blank; and fifthly, the degreased blank is subjected to thermal degreasing and sintering, and the injection molding titanium alloy product is obtained. YB6 is adopted as an oxygen absorbent, the oxygen content in a matrix of the injection-molded titanium alloy product is reduced, meanwhile, TiB and Y2O3 reinforced phases are generated in situ, synchronous improvement of strength and plasticity is effectively achieved, the high-performance injection-molded titanium alloy product is obtained, and the obtained injection-molded titanium alloy product is low in oxygen content, high in density, excellent in mechanical property and good in mechanical property. And the development of the titanium and titanium alloy injection molding industry can be promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of powder metallurgy titanium, and in particular relates to a method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber. Background Art

[0002] Titanium and titanium alloys have a series of advantages such as low density, high specific strength, strong corrosion resistance, good biocompatibility, non-magnetic, good heat resistance and low-temperature toughness, etc. They play an important role in aerospace, shipbuilding, chemical industry, medical treatment, automobile manufacturing and other fields, and are known as the "metal of the future". However, the processing performance of titanium alloys is poor, which brings great difficulties to the production of complex titanium alloy parts.

[0003] As a near-net-shape forming technology, metal powder injection molding eliminates the processing steps and has the advantages of flexible process, high material utilization, uniform organization, and fine grains. It is very suitable for the mass production of small (micro) titanium alloy parts with complex structures. However, the titanium alloy powder used for injection molding has a small particle size (usually less than 25μm), a large specific surface area, and the titanium element has a strong oxygen affinity, which easily causes the oxygen content of the powder to increase. The lower the oxygen content of the titanium alloy powder, the more expensive it is. Generally, the oxygen content in titanium alloys is required to be less than 0.2wt.%. Once the oxygen content is too high, the plasticity of the titanium alloy will be seriously deteriorated. Therefore, how to control the oxygen content in titanium alloys is the key to preparing high-performance injection molded titanium alloy products. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing high-performance injection-molded titanium alloy products by adding an oxygen absorber in view of the deficiencies of the above-mentioned prior art. The method fully mixes YB6 powder with titanium alloy spherical powder, and then undergoes banburying granulation, injection molding, degreasing, and sintering. YB6 is used as an oxygen absorber to react with the oxygen element in the titanium alloy spherical powder to reduce the oxygen content in the matrix of the injection-molded titanium alloy product, and at the same time, TiB and Y2O3 reinforcing phases are generated in situ, effectively achieving the simultaneous improvement of strength and plasticity, and obtaining a high-performance injection-molded titanium alloy product.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber, characterized in that the method comprises the following steps:

[0006] Step 1, powder mixing: adding titanium alloy spherical powder and YB6 powder into a ball mill, and filling with argon protection, and then using a ball mill to mix evenly to obtain a mixed powder; the speed of the ball mill is 150rpm to 300rpm, the ball-to-material ratio is 4 to 7:1, and the ball milling time is 2h to 4h;

[0007] Step 2, banburying granulation: the mixed powder obtained in step 1 is mixed with a binder, and then banburying treatment is performed under argon protection to obtain a mixture, and then the mixture is granulated to obtain a granular injection molding titanium alloy product feed; the temperature in the banburying treatment is 170°C to 190°C, the rotation speed is 30rpm to 40rpm, and the time is 1h to 3h;

[0008] Step 3, injection molding: feeding the granular injection-molded titanium alloy product obtained in step 2 into the silo of the injection molding machine, and then injecting it into the mold, and then cooling it to obtain an injection-molded titanium alloy product green body; the injection pressure in the injection is 100MPa to 200MPa, the injection temperature is 170°C to 190°C, the injection speed is 140mm / s to 180mm / s, and the cooling time is 5s to 10s;

[0009] Step 4, catalytic degreasing: placing the green body of the injection-molded titanium alloy product obtained in step 3 into an oxalic acid degreasing furnace for catalytic degreasing to obtain a degreased body; the temperature of the catalytic degreasing is 110° C. to 130° C., and the time is 8 h to 12 h;

[0010] Step 5, thermal debinding and sintering: Place the debinded blank obtained in step 4 in a vacuum sintering furnace with a molybdenum heating element, heat it to 500°C~600°C at a heating rate of 1°C / min~3°C / min, keep it warm for 3h~6h, perform thermal debinding, then heat it to 1200°C~1300°C at a heating rate of 5°C / min~7°C / min, keep it warm for 2h~4h, and sinter it to obtain an injection molded titanium alloy product.

[0011] The present invention uses ball milling and parameter control to fully and evenly mix titanium alloy spherical powder and oxygen absorber YB6 powder, uses banburying granulation and parameter control to fully fuse the mixed powder with a binder to obtain a dispersed and evenly distributed granular injection molding titanium alloy product feed, uses injection molding and parameter control to mold the granular injection molding titanium alloy product feed into an injection molding titanium alloy product green body, ensures that the feed has good fluidity to ensure complete filling, prevents excessive fluidity from causing flash and burrs on the green body, removes the binder through catalytic degreasing and parameter control, fully removes the residual binder through thermal degreasing and parameter control, and realizes the densification sintering of injection molded parts by controlling sintering parameters.

[0012] The above-mentioned method for preparing high-performance injection-molded titanium alloy products by adding an oxygen absorber is characterized in that the material of the titanium alloy spherical powder in step one is TA1, TC18 or TC4, the particle size of the titanium or titanium alloy spherical powder satisfies D90≤30μm, and the particle size of the YB6 powder is not greater than 20μm. The present invention is suitable for preparing high-performance injection-molded titanium alloy products from titanium alloy spherical powders of various components. By controlling the particle size of the titanium or titanium alloy spherical powder, it is ensured that the feed has good fluidity, sintering density and surface quality. By controlling the particle size of the YB6 powder to be no greater than 20μm, the YB6 powder and the titanium alloy spherical powder can fully react with oxygen during sintering, thereby ensuring the effect of oxygen absorption.

[0013] The above-mentioned method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber is characterized in that the mass ratio of the titanium alloy spherical powder and the YB6 powder in the mixed powder in step 1 is 99.4-99.8:0.2-0.6. The present invention controls the mass ratio of the titanium alloy spherical powder and the YB6 powder, so that the oxygen absorber can fully react with the oxygen element in the titanium alloy spherical powder, and prevents the generation of too much brittle phase to reduce the plasticity.

[0014] The above-mentioned method for preparing high-performance injection-molded titanium alloy products by adding an oxygen absorber is characterized in that the binder in step 2 is a polyoxymethylene-based system, which is composed of the following components by mass fraction: 80% to 85% polyoxymethylene, 5% to 8% high-density polyethylene, 5% to 8% ethylene-vinyl acetate copolymer, 1% to 5% stearic acid, and 1% to 3% hyperbranched polyamide resin. The present invention controls the composition of the binder to ensure that the feed has sufficient strength and fluidity, and can fully remove the binder during degreasing.

[0015] The above-mentioned method for preparing a high-performance injection molded titanium alloy product by adding an oxygen absorber is characterized in that the mass ratio of the mixed powder to the binder in step 2 is 85-90:10-15. The present invention controls the mass ratio of the mixed powder to the binder to ensure that the binder can fully wrap the alloy powder, so that the injection molded green body has sufficient strength, and avoids the disadvantages of the binder being difficult to remove and the shrinkage rate being too large during sintering.

[0016] The above-mentioned method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber is characterized in that the oxygen content in the cabin of the internal mixer in the internal mixing treatment in step 2 is less than 800 ppm. The present invention controls the oxygen content to prevent oxidation of the material, thereby ensuring the oxygen content of the injection-molded titanium alloy product and improving the performance of the injection-molded titanium alloy product.

[0017] The above-mentioned method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber is characterized in that the mold is preheated at 80° C. to 120° C. before injection in step 3. The present invention prevents the feed from cooling too fast when contacting the mold, thereby causing the defect of insufficient filling.

[0018] The above-mentioned method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorbent is characterized in that the catalytic degreasing in step 4 uses oxalic acid with a mass concentration greater than 95%, and the flow rate of oxalic acid in the catalytic degreasing is 3mL / min to 6mL / min. The present invention accelerates the decomposition of the binder under acidic conditions by using oxalic acid with a mass concentration greater than 95% and controlling the flow rate of oxalic acid, so that the binder is fully removed. Compared with nitric acid, oxalic acid degreasing is more environmentally friendly.

[0019] The above-mentioned method for preparing a high-performance injection molded titanium alloy product by adding an oxygen absorber is characterized in that the thermal degreasing and sintering in step 5 are performed at a vacuum degree of no more than 1×10 -2 The present invention controls the vacuum degree to prevent oxidation of the material, thereby ensuring the oxygen content of the injection-molded titanium alloy product and improving the performance of the injection-molded titanium alloy product.

[0020] The above-mentioned method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber is characterized in that the density of the injection-molded titanium alloy product in step 5 is not less than 97.4%, the microstructure is an equiaxed structure with a grain size of less than 70 μm, and Y2O3 particles less than 2 μm and TiB particles less than 8 μm are uniformly distributed in the matrix. The injection-molded titanium alloy product prepared by the present invention has high density and uniform structure, and these structures and reinforcing phases bring higher tensile strength and plasticity to the product.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The present invention fully mixes YB6 powder and titanium alloy spherical powder, and then carries out banburying granulation, injection molding, degreasing and sintering. YB6 is used as an oxygen absorber to react with oxygen elements in the titanium alloy spherical powder to reduce the oxygen content in the matrix of the injection-molded titanium alloy product. The preparation cost is low, and TiB and Y2O3 reinforcing phases are generated in situ, which effectively realizes the simultaneous improvement of strength and plasticity, and obtains high-performance injection-molded titanium alloy products. The obtained injection-molded titanium alloy products have low oxygen content, high density and excellent mechanical properties, which solves the problem of excessively high oxygen content in ultrafine titanium alloy powder for injection molding, and is helpful to promote the development of titanium and titanium alloy injection molding industry.

[0023] 2. The present invention uses ball milling and parameter control to fully mix the titanium alloy spherical powder and the oxygen absorber YB6 powder, and uses banburying granulation and parameter control to fully fuse the mixed powder and the binder to obtain a dispersed and uniform granular injection molding titanium alloy product feed. The granular injection molding titanium alloy product feed is molded into an injection molded titanium alloy product green body by injection molding and parameter control, ensuring that the feed has good fluidity to ensure complete filling and preventing the green body from generating flash and burrs due to excessive fluidity. The binder is removed by catalytic degreasing and parameter control, and the residual binder is fully removed by thermal degreasing and parameter control. The densification sintering of the injection molded parts is achieved by controlling the sintering parameters.

[0024] 3. The yttrium element in the YB6 powder of the present invention has a very strong ability to combine with the oxygen element, and forms Y2O3 during sintering, which can greatly reduce the oxygen content in the titanium alloy matrix. At the same time, it can break the oxide film on the surface of the titanium alloy spherical powder, improve the powder sintering activity, and thus promote sintering densification. On the other hand, the boron element in YB6 can generate the TiB second phase in situ during the sintering process, promote grain refinement, strengthen the matrix, and help improve the comprehensive mechanical properties of the titanium alloy.

[0025] 4. The present invention controls the mass ratio of the titanium alloy spherical powder and the YB6 powder, so that the oxygen absorber can fully react with the oxygen element in the titanium alloy spherical powder, and can prevent the generation of too much brittle phase to reduce the plasticity.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a scanning electron microscope image of the Ti-6Al-4V spherical powder used in Example 1 of the present invention.

[0028] Figure 2 This is a scanning electron microscope image of the YB6 powder used in Example 1 of the present invention.

[0029] Figure 3 This is a microstructure morphology diagram of the tensile test bar of the injection molded titanium alloy product prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0030] Example 1

[0031] This embodiment includes the following steps:

[0032] Step 1, powder mixing: TC4 (Ti-6Al-4V) spherical powder with a particle size of less than 25 μm and an oxygen content of 0.17 wt.% and YB6 powder with a particle size of less than 10 μm are added into a ball mill at a mass ratio of 99.6:0.4, and filled with argon protection, and mixed evenly using a ball mill. The speed of the ball mill is 200 rpm, the ball-to-material ratio is 5:1, and the ball milling time is 3 hours to obtain a mixed powder and seal it for storage;

[0033] Step 2, internal mixing and granulation: the mixed powder obtained in step 1 and the binder are added into an internal mixer at a mass ratio of 90:10 for mixing, and the internal mixing treatment is performed under argon protection, the oxygen content in the cabin of the internal mixer is less than 600ppm, the internal mixing temperature is 180°C, the rotation speed is 35rpm, and the time is 1h to obtain a mixture, and then the mixture is granulated by a granulator to obtain a granular injection molding titanium alloy product feed; the binder is composed of the following components by mass fraction: 82% of polyoxymethylene, 6% of high-density polyethylene, 5% of ethylene-vinyl acetate copolymer, 5% of stearic acid and 2% of hyperbranched polyamide resin;

[0034] Step 3, injection molding: feeding the granular injection-molded titanium alloy product obtained in step 2 into the silo of the injection molding machine, preheating the mold at 100°C, and then injecting it into the mold, the injection pressure is 120MPa, the injection temperature is 180°C, the injection speed is 150mm / s, the cooling time is 10s, and the injection-molded titanium alloy product green body is obtained;

[0035] Step 4, catalytic degreasing: the green body of the injection molded titanium alloy product obtained in step 3 is placed in an oxalic acid degreasing furnace for catalytic degreasing, the catalytic degreasing adopts oxalic acid with a mass concentration greater than 95%, and the flow rate of oxalic acid is 4 mL / min, the temperature of catalytic degreasing is 130° C., and the time is 10 h to obtain a degreased body;

[0036] Step 5: Thermal debinding and sintering: Place the debinded blank obtained in step 4 in a vacuum sintering furnace with a molybdenum heating element. -3 Pa started to heat up at a heating rate of 2°C / min to 550°C, kept at that temperature for 4 hours for thermal degreasing, then heated to 1300°C at a heating rate of 5°C / min, kept at that temperature for 2 hours for sintering, and cooled to room temperature with the furnace to obtain the injection molded titanium alloy product tensile test bar.

[0037] After testing, the microstructure of the tensile test bar of the injection molded titanium alloy product prepared in this embodiment is an equiaxed structure with a grain size of less than 70μm, Y2O3 particles less than 2μm and TiB particles less than 8μm are uniformly distributed in the α matrix, and the room temperature tensile elongation at break of the tensile test bar reaches 6.5%, the tensile strength reaches 980MPa, and the density can reach 98.0%.

[0038] Figure 1 The scanning electron microscope image of the Ti-6Al-4V spherical powder used in this embodiment is shown in FIG. Figure 1 It can be seen that the particle size of Ti-6Al-4V spherical powder is less than 25 μm, with high sphericity, fewer satellite balls and good surface quality.

[0039] Figure 2 The scanning electron microscope image of the YB6 powder used in this example is shown in FIG. Figure 2 It can be seen that the YB6 powder is an irregular powder with a particle size less than 15 μm.

[0040] Figure 3 The microstructure morphology of the tensile test bar of the injection molded titanium alloy product prepared in this embodiment is shown in FIG. Figure 3 It can be seen that the microstructure of the injection molded titanium alloy product is an equiaxed structure with a grain size of less than 70 μm, and Y2O3 particles less than 2 μm and TiB particles less than 8 μm are evenly distributed in the matrix.

[0041] Comparative Example 1

[0042] The difference between this comparative example and Example 1 is that no YB6 powder is added.

[0043] According to the test, the room temperature tensile elongation at break of the tensile test bar of the injection molded titanium alloy product prepared in this comparative example is only 4.0%, the tensile strength is only 935 MPa, and the density is 96.8%.

[0044] By comparing Example 1 with Comparative Example 1, it can be seen that the tensile properties and density of the tensile test bar of the injection molded titanium alloy product obtained by adding YB6 as an oxygen absorber in Example 1 are significantly higher than those in Comparative Example 1 without adding the oxygen absorber, indicating that the addition of the oxygen absorber can significantly improve the strength, plasticity and density of the tensile test bar of the injection molded titanium alloy product.

[0045] Example 2

[0046] This embodiment includes the following steps:

[0047] Step 1, powder mixing: add TA1 spherical powder with a particle size of less than 25 μm and an oxygen content of 0.14 wt.% and YB6 powder with a particle size of less than 10 μm in a mass ratio of 99.8:0.2 into a ball mill, and fill with argon protection, and use a ball mill to mix evenly. The speed of the ball mill is 150 rpm, the ball-to-material ratio is 7:1, and the ball milling time is 4 hours to obtain a mixed powder and seal it for storage;

[0048] Step 2, internal mixing and granulation: the mixed powder obtained in step 1 and the binder are added into an internal mixer at a mass ratio of 88:12 for mixing, and the internal mixing treatment is performed under argon protection, the oxygen content in the cabin of the internal mixer is less than 700ppm, the internal mixing temperature is 170°C, the rotation speed is 40rpm, and the time is 3h to obtain a mixture, and then the mixture is granulated by a granulator to obtain a granular injection molding titanium alloy product feed; the binder is composed of the following components by mass fraction: 80% of polyoxymethylene, 8% of high-density polyethylene, 6% of ethylene-vinyl acetate copolymer, 3% of stearic acid and 3% of hyperbranched polyamide resin;

[0049] Step 3, injection molding: feeding the granular injection-molded titanium alloy product obtained in step 2 into the silo of the injection molding machine, preheating the mold at 80°C, and then injecting it into the mold, the injection pressure is 200MPa, the injection temperature is 170°C, the injection speed is 180mm / s, the cooling time is 5s, and the injection-molded titanium alloy product green body is obtained;

[0050] Step 4, catalytic degreasing: the green body of the injection molded titanium alloy product obtained in step 3 is placed in an oxalic acid degreasing furnace for catalytic degreasing, the catalytic degreasing adopts oxalic acid with a mass concentration greater than 95%, and the flow rate of oxalic acid is 3mL / min, the temperature of catalytic degreasing is 120°C, and the time is 12h to obtain a degreased blank;

[0051] Step 5: Thermal debinding and sintering: Place the debinded blank obtained in step 4 in a vacuum sintering furnace with a molybdenum heating element. -3 Pa starts to heat up at a heating rate of 1°C / min to 500°C, keeps the temperature for 6 hours, performs thermal degreasing, then heats up to 1250°C at a heating rate of 7°C / min, keeps the temperature for 3 hours, performs sintering, and cools to room temperature with the furnace to obtain an injection molded titanium alloy product.

[0052] After testing, the microstructure of the injection molded titanium alloy product prepared in this embodiment is an equiaxed structure with a grain size of less than 70μm, Y2O3 particles less than 2μm and TiB particles less than 8μm are uniformly distributed in the α matrix, the room temperature tensile elongation at break of the tensile test rod reaches 10.0%, the tensile strength reaches 490MPa, and the density can reach 97.4%.

[0053] Example 3

[0054] This embodiment includes the following steps:

[0055] Step 1, powder mixing: add TC18 (Ti-5Al-5Mo-5V-1Cr-1Fe) spherical powder with a particle size of less than 25 μm and an oxygen content of 0.18 wt.% and YB6 powder with a particle size of less than 10 μm in a mass ratio of 99.4:0.6 into a ball mill, and fill it with argon protection, and mix them evenly using a ball mill. The speed of the ball mill is 300 rpm, the ball-to-material ratio is 4:1, and the ball milling time is 2 hours to obtain a mixed powder and seal it for storage;

[0056] Step 2, internal mixing and granulation: the mixed powder obtained in step 1 and the binder are added into an internal mixer at a mass ratio of 85:15 for mixing, and the internal mixing treatment is performed under argon protection, the oxygen content in the cabin of the internal mixer is less than 500ppm, the internal mixing temperature is 190°C, the rotation speed is 30rpm, and the time is 2h to obtain a mixture, and then the mixture is granulated by a granulator to obtain a granular injection molding titanium alloy product feed; the binder is composed of the following components by mass fraction: 85% of polyoxymethylene, 5% of high-density polyethylene, 8% of ethylene-vinyl acetate copolymer, 1% of stearic acid and 1% of hyperbranched polyamide resin;

[0057] Step 3, injection molding: feeding the granular injection-molded titanium alloy product obtained in step 2 into the silo of the injection molding machine, preheating the mold at 120° C., and then injecting it into the mold, the injection pressure is 100 MPa, the injection temperature is 190° C., the injection speed is 140 mm / s, the cooling time is 8 s, and the injection-molded titanium alloy product green body is obtained;

[0058] Step 4, catalytic degreasing: the green body of the injection molded titanium alloy product obtained in step 3 is placed in an oxalic acid degreasing furnace for catalytic degreasing, the catalytic degreasing adopts oxalic acid with a mass concentration greater than 95%, and the flow rate of oxalic acid is 6mL / min, the temperature of catalytic degreasing is 110°C, and the time is 8h to obtain a degreased body;

[0059] Step 5: Thermal debinding and sintering: Place the debinded blank obtained in step 4 in a vacuum sintering furnace with a molybdenum heating element. -3 Pa starts to heat up at a heating rate of 3°C / min to 600°C, keeps the temperature for 3 hours, performs thermal degreasing, then heats up to 1200°C at a heating rate of 6°C / min, keeps the temperature for 4 hours, performs sintering, and cools to room temperature with the furnace to obtain an injection molded titanium alloy product.

[0060] After testing, the microstructure of the injection-molded titanium alloy product prepared in this embodiment is an equiaxed structure with a grain size of less than 70 μm, Y2O3 particles less than 2 μm and TiB particles less than 8 μm are uniformly distributed in the α matrix, the room temperature tensile elongation at break of the tensile test rod reaches 5.5%, the tensile strength reaches 1100 MPa, and the density can reach 97.5%.

[0061] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber, characterized in that: The method comprises the following steps: Step 1, powder mixing: adding titanium alloy spherical powder and YB6 powder into a ball mill, and filling with argon protection, and then using a ball mill to mix evenly to obtain a mixed powder; the speed of the ball mill is 150rpm to 300rpm, the ball-to-material ratio is 4 to 7:1, and the ball milling time is 2h to 4h; Step 2, banburying granulation: the mixed powder obtained in step 1 is mixed with a binder, and then banburying treatment is performed under argon protection to obtain a mixture, and then the mixture is granulated to obtain a granular injection molding titanium alloy product feed; the temperature in the banburying treatment is 170°C to 190°C, the rotation speed is 30rpm to 40rpm, and the time is 1h to 3h; Step 3, injection molding: feeding the granular injection-molded titanium alloy product obtained in step 2 into the silo of the injection molding machine, and then injecting it into the mold, and then cooling it to obtain an injection-molded titanium alloy product green body; the injection pressure in the injection is 100MPa to 200MPa, the injection temperature is 170°C to 190°C, the injection speed is 140mm / s to 180mm / s, and the cooling time is 5s to 10s; Step 4, catalytic degreasing: placing the green body of the injection-molded titanium alloy product obtained in step 3 into an oxalic acid degreasing furnace for catalytic degreasing to obtain a degreased body; the temperature of the catalytic degreasing is 110° C. to 130° C., and the time is 8 h to 12 h; Step 5, thermal debinding and sintering: Place the debinded blank obtained in step 4 in a vacuum sintering furnace with a molybdenum heating element, heat it to 500°C~600°C at a heating rate of 1°C / min~3°C / min, keep it warm for 3h~6h, perform thermal debinding, then heat it to 1200°C~1300°C at a heating rate of 5°C / min~7°C / min, keep it warm for 2h~4h, and sinter it to obtain an injection molded titanium alloy product.

2. The method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber according to claim 1, characterized in that: The material of the titanium alloy spherical powder in step 1 is TA1, TC18 or TC4, the particle size of the titanium or titanium alloy spherical powder satisfies D90≤30μm, and the particle size of the YB6 powder is not greater than 20μm.

3. The method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber according to claim 1, characterized in that: The mass ratio of the titanium alloy spherical powder to the YB6 powder in the mixed powder in step 1 is 99.4-99.8:0.2-0.

6.

4. The method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber according to claim 1, characterized in that: The binder in step 2 is a polyoxymethylene-based system, which is composed of the following components in mass fraction: 80% to 85% polyoxymethylene, 5% to 8% high-density polyethylene, 5% to 8% ethylene-vinyl acetate copolymer, 1% to 5% stearic acid and 1% to 3% hyperbranched polyamide resin.

5. The method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber according to claim 1, characterized in that: The mass ratio of the mixed powder to the binder in step 2 is 85-90:10-15.

6. The method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber according to claim 1, characterized in that: In the internal mixing process described in step 2, the oxygen content in the cabin of the internal mixer is less than 800 ppm.

7. The method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber according to claim 1, characterized in that: In step 3, the mold is preheated at 80°C to 120°C before injection.

8. The method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber according to claim 1, characterized in that: The catalytic degreasing in step 4 uses oxalic acid with a mass concentration greater than 95%, and the flow rate of oxalic acid in the catalytic degreasing is 3 mL / min to 6 mL / min.

9. The method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber according to claim 1, characterized in that: The thermal debinding and sintering in step 5 are performed under a vacuum of no more than 1×10 -2 Pa conditions.

10. The method for preparing a high-performance injection-molded titanium alloy product by adding an oxygen absorber according to claim 1, characterized in that: The density of the injection molded titanium alloy product in step 5 is not less than 97.4%, the microstructure is an equiaxed structure with a grain size of less than 70 μm, and Y2O3 particles less than 2 μm and TiB particles less than 8 μm are uniformly distributed in the matrix.

Images