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Injection moulding method for Ti6A14V alloy gel

A gel injection molding, ti6al4v technology, applied in the field of titanium alloy forming, can solve the problems of component segregation, defects and even collapse, and it is not suitable for large-scale forming, and achieve the effect of low organic content, less green body shrinkage, and less organic content

Inactive Publication Date: 2008-08-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vacuum melting and precision casting have defects, such as easy segregation of components and uneven structure, introduction of impurities, low production efficiency and high production cost
The traditional powder metallurgy method uses a simple three-step process of powder mixing-pressing-sintering to produce high-performance titanium alloys, but this method can only produce parts with simple shapes, and the production efficiency is low and the production cost is high
The metal injection molding method can prepare parts with complex shapes, but this method needs to mix a large amount of organic binder in the metal powder, so that the degreasing and wax removal process of the formed body takes a very long time, and the elimination of organic matter During the process, it is easy to cause defects or even collapse, and it is not suitable to form a large green body with an uneven structure and a complex inner cavity. At the same time, high O and C will remain (due to the decomposition of the binder during the removal of the binder)

Method used

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  • Injection moulding method for Ti6A14V alloy gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The powder is prepared from hydrogenation-dehydrogenation Ti6Al4V powder and gas-atomized Ti6Al4V powder, wherein the mass percentage of gas-atomized Ti6Al4V powder is 90%. The concentration of acrylamide in the premix is ​​15%, and the mass ratio of acrylamide:methylenebisacrylamide is 90:1. Add 475 grams of prepared powder and 1 gram of defoamer isooctyl alcohol to every 100 mL of premix. After stirring evenly, add catalyst tetramethylethylenediammonium (25 μL per 100 mL of slurry), initiator ammonium persulfate (mass fraction 10%, add 15 μL per 100 mL of slurry), stir for 10 seconds, and quickly pour into the mold , in an oven at 60°C for 0.5 hours, demolded, put in an oven at 60°C for 6 hours, and take it out. In a vacuum of 10 -4 Pa, degreasing at 350°C for 30 minutes, sintering at 1250°C for 3 hours, and cooling with the furnace to obtain titanium alloy parts with better comprehensive mechanical properties and higher dimensional accuracy.

Embodiment 2

[0028] The concentration of hydroxyethyl methacrylate in the premix is ​​20%, and the mass ratio of hydroxyethyl methacrylate: methylenebisacrylamide is 30:1. Add 550 grams of aerosolized Ti6Al4V powder and 2 grams of defoamer fatty acid to each 100 mL of premixed solution. After stirring evenly, add catalyst tetramethylethylenediammonium (30 μL per 100 mL of slurry), initiator potassium persulfate (mass fraction 8%, add 50 μL per 100 mL of slurry), stir for 5 seconds, and quickly pour into the mold , vacuum-dried in an oven at 50°C for 1 hour, demolded, put in an oven and dried at 50°C for 15 hours, and took it out. In a vacuum of 10 -3 Pa, degreasing at 400°C for 20 minutes, sintering at 1300°C for 2 hours, and cooling with the furnace to obtain titanium alloy parts with better comprehensive mechanical properties and higher dimensional accuracy.

Embodiment 3

[0030] The powder may be prepared from hydrogenation-dehydrogenation Ti6Al4V powder and gas-atomized Ti6Al4V powder, wherein the mass percentage of gas-atomized Ti6Al4V powder is 80%. The concentration of hydroxypropyl methacrylate in the premix is ​​20%, and the mass ratio of hydroxypropyl methacrylate:methylenebisacrylamide is 100:1. Add 500 grams of prepared powder and 2 grams of tributyl phosphate defoamer to every 100 mL of premixed solution. After stirring evenly, add catalyst tetramethylethylenediammonium (30 μL per 100 mL of slurry), initiator ammonium persulfate (mass fraction 10%, add 50 μL per 100 mL of slurry), stir for 5 seconds, and quickly pour into the mold In the middle, dry in an oven at 70°C for 0.5 hours, demould, put in an oven and dry at 70°C for 20 hours and take it out. In a vacuum of 10 -3 Pa, degreasing at 350°C for 30 minutes, sintering at 1300°C for 2 hours, and cooling with the furnace to obtain titanium alloy parts with better comprehensive mech...

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Abstract

A gel injection moulding method for the Ti6Al4V alloy includes such steps as preparing premixed liquid, preparing slurry, preparing blank, drying while degumming, and sintering. Its advantages are high strength and size precision and complex shape of product, and low cost.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy forming, and in particular provides a Ti6Al4V alloy gel injection molding method, which realizes the preparation of low-cost and high-performance titanium alloy. Background technique [0002] Titanium and titanium alloys have low density, high specific strength, low elastic modulus, good high temperature strength, non-toxic and non-magnetic, excellent corrosion resistance and other properties, and are widely used in petrochemical, aerospace, automobile, bioengineering (good compatibility Sex), watches, environmental protection, golf equipment, spectacle frames and other fields. Therefore, the study of this material has always been a hot spot in the field of material research. At present, the relatively mature methods for preparing Ti6Al4V mainly include vacuum melting, precision casting, powder metallurgy and metal injection molding. Vacuum smelting and precision casting have defects, suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22
Inventor 郝俊杰茹敏朝郭志猛王亚利
Owner UNIV OF SCI & TECH BEIJING
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