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Injection forming method for preparing high Niobium containing Ti-Al alloy components

A technology of titanium-aluminum alloys and parts, which is applied in the field of forming high-niobium titanium-aluminum intermetallic materials, can solve the problems of no relevant reports, and achieve the effects of good comprehensive mechanical properties, low production cost, and uniform material structure

Inactive Publication Date: 2008-10-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, only a few scholars at home and abroad have carried out research on the preparation of common TiAl-based alloy materials by powder injection molding technology (R.Gerling, F.P.Schimansky.Prospects for metal injectionmolding using a gamma titanium aluminum based alloy powder. Materials Science and Engineering, 2002, A329-331: 45-49; R. Gerling, E. Aust, W. Limberg, M. Pfuff, F. P. Schimansky. Metal injection molding of gamma titanium aluminum alloy powder. Materials Science and Engineering, 2006, A423, 1- 2:262-268), but there is no relevant report on the preparation of high Nb-TiAl based alloy materials by powder injection molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Raw material: argon atomized pre-alloyed powder with the composition of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (atomic percentage content), the particle size is 20-60μm; the adhesive is made of multi-polymer components For the paraffin-based (PW) adhesive, the weight percentage of each component is PW:LDPE:PP:SA=63:20:12:5, and the powder loading is 65%.

[0016] Mix the powder and the prepared adhesive on the SK-160 open type rubber mixer for 1 hour, the mixing temperature is 145°C, and then granulate on the PSJ32 twin-screw mixing extruder to make the feeding more uniform , the feed after granulation is injected under the conditions of injection temperature 150°C and injection pressure 100Mpa to obtain a high Nb-TiAl alloy preform of complex shape, and then immerse the preform in trichlorethylene for solvent degreasing for 10 hours , the degreasing temperature is 35°C. After the degreasing is completed, take out the green body and dry it in a constant temperature drying oven. ...

Embodiment 2

[0018] Raw material: argon atomized pre-alloyed powder with the composition of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (atomic percentage content), the particle size is 20-60μm; the adhesive is made of multi-polymer components For the paraffin-based (PW) adhesive, the weight percentage of each component is PW:LDPE:PP:SA=67:20:14:2, and the powder loading is 67%.

[0019] Mix the powder and the prepared adhesive on the SK-160 open type rubber mixer for 1.5 hours, the mixing temperature is 140°C, and then granulate on the PSJ32 twin-screw mixing extruder to make the feeding more uniform , the feed material after granulation is injected under the conditions of injection temperature 140°C and injection pressure 90Mpa to obtain a high Nb-TiAl alloy preform of complex shape, and then immerse the preform in trichlorethylene for solvent degreasing for 12 hours , the degreasing temperature is 40°C. After the degreasing is completed, take out the body and dry it in a constant temperature drying o...

Embodiment 3

[0021] Raw material: argon atomized pre-alloyed powder with the composition of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (atomic percentage content), the particle size is 20-60μm; the adhesive is made of multi-polymer components For the paraffin-based (PW) adhesive, the weight percent of each component is PW:LDPE:PP:SA=65:18:13:4, and the powder loading is 66%.

[0022] Mix the powder and the prepared adhesive on the SK-160 open type rubber mixer for 1 hour, the mixing temperature is 150°C, and then granulate on the PSJ32 twin-screw mixing extruder to make the feeding more uniform , the feed material after granulation is injected under the conditions of injection temperature 145°C and injection pressure 90Mpa to obtain a high Nb-TiAl alloy preform of complex shape, and then immerse the preform in trichlorethylene for solvent degreasing for 14 hours , the degreasing temperature is 35°C. After the degreasing is completed, take out the body and dry it in a constant temperature drying oven. T...

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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 [0001] The invention belongs to the technical field of forming high-niobium-titanium-aluminum intermetallic compound materials, and in particular provides a method for preparing high-niobium-titanium-aluminum alloy parts with complex shapes and high dimensional precision by using powder injection molding technology. Background technique [0002] High Nb-TiAl intermetallic materials have attracted extensive attention due to their excellent high-temperature performance, oxidation resistance, and creep resistance. After nearly ten years of research, a series of important progress has been made in phase diagram, alloying, oxidation resistance, microstructure and mechanical properties. The addition of high-content refractory metal Nb increases the melting point and ordering temperature of the alloy, and the solid solution strengthening of Nb makes its yield strength at 900 °C increase by about 300-500 MPa compared with ordinary titanium-aluminum alloys. The additi...

Claims

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Application Information

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IPC IPC(8): B22F3/16B22F1/00
Inventor 何新波张昊明曲选辉赵丽明
Owner UNIV OF SCI & TECH BEIJING
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