CN100581690C - Injection forming method for preparing high Niobium containing Ti-Al alloy components - Google Patents
Injection forming method for preparing high Niobium containing Ti-Al alloy components Download PDFInfo
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Abstract
A method for preparing complex shaped high-niobium titanium aluminum alloy parts with high dimension precision pertains to the field of material forming technology of high-niobium titanium aluminum intermetallic compounds. The process is that argon atomized high-niobium titanium aluminum powder and a polymer which is composed of paraffin PW with the different weight mixing ratio, low-density polyethylene LDPE, polypropylene PP and stearic acid SA are mixed and granulated by a binding agent with the load of 63 to 69 percent, the injection molding is carried out, after that, the solvent degreasing and the thermal degreasing in vacuum atmosphere are adopted for removing the binding agent, the pre-sintering is carried out at the temperature of 600 to 1000 DEG C, and the sintering is finally carried out at the temperature of 1460 to 1480 DEG C in the vacuum atmosphere for preparing the high-Nb-TiAl alloy parts. The method has the advantages that: the method can directly prepare the complex shaped high-Nb-TiAl alloy parts with high dimension precision and good performance, thus realizing the batch production of the high-Nb-TiAl alloy parts with low cost.
Description
Technical field
The invention belongs to high-Nb Ti-Al inter-metallic compound material forming technique field, a kind of method of utilizing the powder injection forming technology to prepare complicated shape and high dimensional accuracy high niobium containing titanium aluminium alloy parts particularly is provided.
Background technology
High Nb-TiAl inter-metallic compound material is owing to its excellent high-temperature behavior, non-oxidizability and creep resistance are subjected to extensive concern.Through research in recent ten years, a series of important progress have been obtained at phasor, alloying, non-oxidizability and aspects such as microscopic structure and mechanical property.The adding of high-load refractory metal Nb element has improved the fusing point and the ordering temperature of alloy, the solution strengthening of Nb element, make the more common titanium-aluminium alloy of its yield strength of 900 ℃ improve about 300～500MPa, high-melting-point Nb element has reduced diffusion coefficient when adding, improved non-oxidizability, and the density of having taken into account TiAl base alloy is little, crystal structure simple and be easy to improve by organizational controls the advantage of performance, thereby might replace the Ni based high-temperature alloy of active service and become the high-temperature structural material of new generation that following Aeronautics and Astronautics field has application potential.But, high Nb alloying has caused the smelting temperature of alloy and hot processing temperature to improve when improving its elevated temperature strength, has also further reduced its room temperature and high-temp plastic, especially temperature-room type plasticity is lower than general T iAl, thereby has increased the difficulty of Alloy Forming preparation.
At present, all be to adopt method of smelting to prepare high Nb-TiAl alloy, carry out repeatedly hot-working then.The preparation process of alloy is comparatively complicated, the even phenomenon of casting flaw, component segregation and tissue odds appears easily, though the high Nb-TiAl alloy through isothermal forging repeatedly obtains evenly tiny bifurcation tissue, temperature-room type plasticity increases, be shaped but still be difficult to follow-up machining, realize the preparation of complicated shape and high dimensional accuracy parts.Also there is the scholar to utilize the method for discharge plasma sintering to prepare high Nb-TiAl alloy, but also can only prepares the alloy of bulk shape, be difficult to realize the preparation of complicated shape and high dimensional accuracy parts equally.
Powder injection forming be with alloy powder and a large amount of organic binder bond through mixing, injection moulding with remove the steps such as degreasing of binding agent, finally sinter the process of fine and close product into.This technology has been inherited the method for ceramic powders injection moulding, is the product that traditional metallurgy method and injection molding of plastics combine.Its maximum characteristics are to have realized near-net-shape, have avoided the machining of postorder, aspect preparation complex geometry product, have remarkable advantages, and preparation cost have only traditional forming technology 20～60%.Up to the present, have only a few scholar to carry out the research (R.Gerling that the powder injection forming technology prepares general T iAl base alloy material both at home and abroad, F.P.Schimansky.Prospects for metal injectionmoulding using a gamma titanium aluminide based alloy powder.Materials Scienceand Engineering, 2002, A329-331:45-49; R.Gerling, E.Aust, W.Limberg, M.Pfuff, F.P.Schimansky.Metal injection moulding of gamma titanium aluminide alloy powder.Materials Science and Engineering, 2006, A423,1-2:262-268), but, also do not have relevant report for the research that utilizes powder injection forming to prepare high Nb-TiAl base alloy material.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing the powder injection technology to prepare the alloy material of high niobium-titanium-aluminum parts, avoid follow-up machining to be shaped, realize near-net-shape, realize preparation complicated shape and the high niobium containing titanium aluminium alloy parts of high dimensional accuracy and the batch process of lower cost.
The present invention adopts the method for injection moulding to prepare the shaping base, prepares the high niobium containing titanium aluminium alloy parts by degreasing and sintering then.Concrete technology is:
1, the preparation of bonding agent: the bonding agent that the present invention prepared is the basic bonding agent of heteropolymer constituent element paraffin (PW), with low density polyethylene (LDPE) (LDPE), polypropylene (PP) as plasticizer, with stearic acid (SA) is surfactant, and each constituent element percentage by weight is PW: LDPE: PP: SA=(63～68): (18～22): (10～15): (2～5).To carry out blend in four kinds of constituent elements adding torque rheometers or the double screw extruder, and it is even to reach composition;
2, mixing: with selected high Nb-TiAl pre-alloyed powder and the bonding agent prepared on opening rubber mixing machine mixing 1～1.5 hour, melting temperature is 140～150 ℃, on the twin-screw mixer extruder, granulate again, make feeding further even, the powder useful load is 63～69% (volumn concentrations);
3, injection moulding: the back gained feeding of will granulating is injected under the condition of injection pressure 90～100Mpa 140～150 ℃ of injection temperatures, obtains the high Nb-TiAl alloy preform of complicated shape;
4, degreasing: the two step degreasing methods that adopt solvent degreasing+subsequent thermal degreasing, at first preform is dipped in and carries out solvent degreasing 10～20 hours in the trichloro-ethylene, skimming temp is 30～40 ℃, taking out base substrate after degreasing is finished dries in thermostatic drying chamber, in the tubular type vacuum drying oven, carry out hot degreasing again, skimming temp is between 30～600 ℃, and the time is 6～12 hours, and further the degreasing base is heated to and carries out presintering 1～1.5 hour between 600～1000 ℃;
5, sintering: place vacuum sintering furnace in 1460～1480 ℃ of sintering the presintering base, be incubated 1～2 hour, heating rate is 6～8 ℃/min, and sintered body is handled through follow-up finishing, obtains high Nb-TiAl alloy parts.
The alloy powder composition that the present invention adopts is the argon gas atomizing pre-alloyed powder of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (atomic percentage conc), and granularity is 20～60 μ m.
The invention has the advantages that and can directly prepare the high Nb-TiAl alloy parts with complicated shape and high dimensional accuracy, simultaneously, material structure is even, density is high, comprehensive mechanical property is better, can realize producing in batches high Nb-TiAl alloy parts, the stock utilization height, production cost is low.
The specific embodiment
Embodiment 1:
Raw material: composition is the argon gas atomizing prealloy powder of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (atomic percentage conc), and granularity is 20～60 μ m; Bonding agent is adopted as heteropolymer constituent element paraffinic base (PW) bonding agent, and its each constituent element percentage by weight is PW: LDPE: PP: SA=63: 20: 12: 5, the powder useful load was 65%.
With powder and the bonding agent for preparing on SK-160 type opening rubber mixing machine mixing 1 hour, melting temperature is 145 ℃, on PSJ32 type twin-screw mixer extruder, granulate again, make feeding further even, feeding after the granulation is 150 ℃ of injection temperatures, inject under the condition of injection pressure 100Mpa, obtain the high Nb-TiAl alloy preform of complicated shape, then preform is dipped in and carries out solvent degreasing 10 hours in the trichloro-ethylene, skimming temp is 35 ℃, taking out base substrate after degreasing is finished dries in thermostatic drying chamber, hot degreasing is carried out in the tubular type vacuum drying oven, skimming temp is between 30～600 ℃, degreasing is 12 hours altogether, and the degreasing base is heated to 800 ℃ carried out presintering 1 hour, at last the presintering base is placed ZGS150 type vacuum sintering furnace in 1480 ℃ of sintering, be incubated 1 hour, heating rate is 6 ℃/min, sintered body is through subsequent treatment, promptly obtain relative density and reach 96%, dimensional accuracy is up to ± 0.2% and comprehensive mechanical property better (compression strength 2560MPa, compression ratio 34%, tensile strength 319MPa, percentage elongation 0.63%) the high Nb-TiAl alloy of complicated shape parts.
Embodiment 2:
Raw material: composition is the argon gas atomizing prealloy powder of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (atomic percentage conc), and granularity is 20～60 μ m; Bonding agent is adopted as heteropolymer constituent element paraffinic base (PW) bonding agent, and its each constituent element percentage by weight is PW: LDPE: PP: SA=67: 20: 14: 2, the powder useful load was 67%.
With powder and the bonding agent for preparing on SK-160 type opening rubber mixing machine mixing 1.5 hours, melting temperature is 140 ℃, on PSJ32 type twin-screw mixer extruder, granulate again, make feeding further even, feeding after the granulation is 140 ℃ of injection temperatures, inject under the condition of injection pressure 90Mpa, obtain the high Nb-TiAl alloy preform of complicated shape, then preform is dipped in and carries out solvent degreasing 12 hours in the trichloro-ethylene, skimming temp is 40 ℃, taking out base substrate after degreasing is finished dries in thermostatic drying chamber, hot degreasing is carried out in the tubular type vacuum drying oven, skimming temp is between 30～600 ℃, degreasing is 8 hours altogether, and the degreasing base is heated to 1000 ℃ carried out presintering 1.5 hours, at last the presintering base is placed ZGS150 type vacuum sintering furnace in 1460 ℃ of sintering, be incubated 1.5 hours, heating rate is 7 ℃/min, sintered body is through subsequent treatment, promptly obtain relative density and reach 96%, dimensional accuracy is up to ± 0.2% and comprehensive mechanical property better (compression strength 2210MPa, compression ratio 31%, tensile strength 287MPa, percentage elongation 0.54%) the high Nb-TiAl alloy of complicated shape parts.
Embodiment 3:
Raw material: composition is the argon gas atomizing prealloy powder of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (atomic percentage conc), and granularity is 20～60 μ m; Bonding agent is adopted as heteropolymer constituent element paraffinic base (PW) bonding agent, and its each constituent element percentage by weight is PW: LDPE: PP: SA=65: 18: 13: 4, the powder useful load was 66%.
With powder and the bonding agent for preparing on SK-160 type opening rubber mixing machine mixing 1 hour, melting temperature is 150 ℃, on PSJ32 type twin-screw mixer extruder, granulate again, make feeding further even, feeding after the granulation is 145 ℃ of injection temperatures, inject under the condition of injection pressure 90Mpa, obtain the high Nb-TiAl alloy preform of complicated shape, then preform is dipped in and carries out solvent degreasing 14 hours in the trichloro-ethylene, skimming temp is 35 ℃, taking out base substrate after degreasing is finished dries in thermostatic drying chamber, hot degreasing is carried out in the tubular type vacuum drying oven, skimming temp is between 30～600 ℃, degreasing is 10 hours altogether, and the degreasing base is heated to 600 ℃ carried out presintering 1 hour, at last the presintering base is placed ZGS150 type vacuum sintering furnace in 1470 ℃ of sintering, be incubated 1 hour, heating rate is 6 ℃/min, sintered body is through subsequent treatment, promptly obtain relative density and reach 96%, dimensional accuracy is up to ± 0.2% and comprehensive mechanical property better (compression strength 2330MPa, compression ratio 32%, tensile strength 294MPa, percentage elongation 0.56%) the high Nb-TiAl alloy of complicated shape parts.
Embodiment 4:
Raw material: composition is the argon gas atomizing prealloy powder of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (atomic percentage conc), and granularity is 20～60 μ m; Bonding agent is adopted as heteropolymer constituent element paraffinic base (PW) bonding agent, and its each constituent element percentage by weight is PW: LDPE: PP: SA=66: 17: 15: 3, the powder useful load was 68%.
With powder and the bonding agent for preparing on SK-160 type opening rubber mixing machine mixing 1 hour, melting temperature is 145 ℃, on PSJ32 type twin-screw mixer extruder, granulate again, make feeding further even, feeding after the granulation is 150 ℃ of injection temperatures, inject under the condition of injection pressure 100Mpa, obtain the high Nb-TiAl alloy preform of complicated shape, then preform is dipped in and carries out solvent degreasing 16 hours in the trichloro-ethylene, skimming temp is 35 ℃, taking out base substrate after degreasing is finished dries in thermostatic drying chamber, hot degreasing is carried out in the tubular type vacuum drying oven, skimming temp is between 30～600 ℃, degreasing is 14 hours altogether, and the degreasing base is heated to 800 ℃ carried out presintering 1.5 hours, at last the presintering base is placed ZGS150 type vacuum sintering furnace in 1480 ℃ of sintering, be incubated 2 hours, heating rate is 8 ℃/min, sintered body is through subsequent treatment, promptly obtain relative density and reach 97%, dimensional accuracy is up to ± 0.2% and comprehensive mechanical property better (compression strength 2350MPa, compression ratio 36%, tensile strength 288MPa, percentage elongation 0.67%) the high Nb-TiAl alloy of complicated shape parts.
Claims (2)
1, a kind of method for preparing complicated shape and high dimensional accuracy high niobium containing titanium aluminium alloy parts is characterized in that preparation technology is:
The preparation of a, bonding agent: the bonding agent of being prepared is a heteropolymer constituent element paraffin PW base bonding agent, with low density polyethylene, polypropylene PP as plasticizer, with stearic acid SA is surfactant, each constituent element percentage by weight is PW: LDPE: PP: SA=(63～68): (18～22): (10～15): (2～5), to carry out blend in four kinds of constituent elements adding torque rheometers or the double screw extruder, and it is even to reach composition;
B, mixing: with selected high Nb-TiAl pre-alloyed powder and the bonding agent prepared on opening rubber mixing machine mixing 1～1.5 hour in proportion, melting temperature is 140～150 ℃, on the twin-screw mixer extruder, granulate again, make feeding further even, powder useful load by volume percentage composition counts 63～69%;
C, injection moulding: the back gained feeding of will granulating is injected under the condition of injection pressure 90～100Mpa 140～150 ℃ of injection temperatures, obtains the high Nb-TiAl alloy preform of complicated shape;
D, degreasing: the two step degreasing methods that adopt solvent degreasing+subsequent thermal degreasing, at first preform is dipped in and carries out solvent degreasing 10～20 hours in the trichloro-ethylene, skimming temp is 30～40 ℃, taking out base substrate after degreasing is finished dries in thermostatic drying chamber, in the tubular type vacuum drying oven, carry out hot degreasing again, skimming temp is between 30～600 ℃, and the time is 6～12 hours, and further the degreasing base is heated to and carries out presintering 1～1.5 hour between 600～1000 ℃;
E, sintering: place vacuum sintering furnace in 1460～1480 ℃ of sintering the presintering base, be incubated 1～2 hour, heating rate is 6～8 ℃/min, and sintered body is handled through follow-up finishing, obtains high Nb-TiAl alloy parts.
2, in accordance with the method for claim 1, it is characterized in that: selected high Nb-TiAl pre-alloyed powder composition is counted the argon gas atomizing pre-alloyed powder of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y with atomic percentage conc, and granularity is 20～60 μ m.
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| CN107790729B (en) * | 2017-11-23 | 2021-08-03 | 北京科技大学 | Method for preparing high-performance aluminum alloy by using powder injection molding technology |
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