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Preparation method of high-quality gamma-TiAl spherical powder

A spherical powder, high-quality technology, applied in the field of preparation of high-quality γ-TiAl spherical powder, to achieve the effect of high sphericity

Inactive Publication Date: 2017-06-16
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a kind of powder metallurgy near-net shape process that can solve the problems of component segregation, coarse grains and loose defects in the process of preparing γ-TiAl alloy by traditional methods, and The alloy powder obtained by the currently commonly used powder making method has poor sphericity and purity, which affects the performance after molding. The present invention provides a high sphericity, low oxygen increase, no inclusions, and controllable particle size distribution. The preparation method of γ-TiAl alloy powder ensures that the formed γ-TiAl alloy has uniform composition, fine structure and excellent performance, and meets the application requirements of aerospace and automobile industries.

Method used

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  • Preparation method of high-quality gamma-TiAl spherical powder

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Comparison scheme
Effect test

Embodiment 1

[0024] A kind of preparation method of high-quality gamma-TiAl spherical powder, by mass percentage, comprises the following steps:

[0025] 1) According to the ingredients of γ-TiAl-based alloy, Ti: 48.32wt%, Al: 31.5wt%, Nb: 15.82wt%, Cr: 1.26wt%, V: 3.10%, smelting into γ-TiAl alloy rod;

[0026] 2) After forging the smelted γ-TiAl alloy rod, stress relief annealing;

[0027] 3) Finish turning the annealed γ-TiAl alloy rod. The processed high-precision alloy rod is: 85mm in diameter, 900mm in length, 0.03mm / m in circular runout, and 0.98μm in roughness;

[0028] 4) Load high-precision alloy rods into the reaction chamber, and vacuum the reaction chamber to 2*10 -3 Pa, fill the reaction chamber with helium, so that the pressure in the chamber is 0.3MPa, and the oxygen content in the atmosphere is 150ppm;

[0029] 5) The power of the plasma gun of PREP powder making equipment is 280kW. The plasma torch contains tungsten cathode and copper anode. The plasma heats the end of ...

Embodiment 2

[0037] A kind of preparation method of high-quality gamma-TiAl spherical powder, by mass percentage, comprises the following steps:

[0038] 1) According to the ingredients of γ-TiAl-based alloy, Ti: 51.93wt%, Al: 28.57wt%, Nb: 18.58wt%, W: 0.87wt%, B: 0.05wt%, smelted into γ-TiAl alloy rod ;

[0039] 2) Stress relief annealing after forging the smelted γ-TiAl alloy rod;

[0040] 3) Finish turning the annealed γ-TiAl alloy rod. The processed high-precision alloy rod is: 35mm in diameter, 150mm in length, 0.07mm in circular runout, and 2.5μm in roughness;

[0041] 4) Load alloy rods into the reaction chamber, and vacuum the reaction chamber to 9*10 -3 Pa, fill the reaction chamber with a mixture of helium and argon, so that the pressure in the chamber is 0.07MPa, and the oxygen content in the atmosphere is 350ppm;

[0042] 5) The power of the plasma gun of PREP powder making equipment is 150kW. The plasma torch contains tungsten cathode and copper anode. The plasma heats the...

Embodiment 3

[0050] A kind of preparation method of high-quality gamma-TiAl spherical powder, by mass percentage, comprises the following steps:

[0051] 1) According to the ingredients of γ-TiAl-based alloy, Al: 26.89wt%, Nb: 9.85wt%, Ti: 38.57wt%, Cr: 5.51wt%, Ta: 19.18wt%, and smelted into γ-TiAl alloy Great;

[0052] 2) Forging the smelted γ-TiAl alloy rod, followed by stress relief annealing;

[0053] 3) Finish turning the annealed γ-TiAl alloy rod. The processed high-precision alloy rod is: 66mm in diameter, 550mm in length, 0.05mm in circular runout, and 1.89μm in roughness;

[0054] 4) Load high-precision alloy rods into the reaction chamber, and vacuum the reaction chamber to 1*10 -3 Pa, fill the reaction chamber with argon, so that the pressure in the chamber is 0.75MPa, and the oxygen content in the atmosphere is 300ppm;

[0055] 5) The power of the plasma gun of the PREP powder making equipment is 250kW. The plasma torch contains tungsten cathode and copper anode. The plasma...

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Abstract

A preparation method of high-quality gamma-TiAl spherical powder comprises the following steps that (1) a gamma-TiAl alloy bar is smelted according to ingredient compounding of a gamma-TiAl base alloy; (2) the smelted gamma-TiAl alloy bar is subjected to forging so as to remove internal defects, and stress relief annealing is performed; (3) annealed gamma-TiAl alloy bar is subjected to finish turning processing to obtain a high-precision alloy bar; (4) the gamma-TiAl alloy bar is loaded to a reaction chamber, and the reaction chamber is vacuumized and filled with inert gas; (5) the end part of the high-precision alloy bar is heated by PREP powder making equipment, atomized drops are thrown away from the end part of the alloy bar, the drops are cooled rapidly into spherical particles in the inert gas environment, and the spherical particles fall into a collector; (6) prepared gamma-TiAl alloy powder is screened and packaged in the inert gas protection environment; (7) the gamma-TiAl alloy powder prepared with the method has the advantages that the degree of sphericity is high, the oxygen increase is low, no mixing exists, and the particle distribution is controllable.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy preparation of light-weight and high-strength titanium-aluminum intermetallic compounds, and in particular relates to a preparation method of high-quality gamma-TiAl spherical powder. Background technique [0002] In the mid-1950s, Mcandrew et al. in the United States first discovered that TiAl-based alloys have low density and excellent high-temperature mechanical properties, but their significant room temperature brittleness restricts the development of TiAl-based alloys. With the emergence of new technologies such as ingot metallurgy and powder metallurgy, the plasticity of TiAl-based alloys has been gradually improved. In the aerospace program formulated by NASA and the plan for the development of high-performance military aircraft engines jointly formulated by NASA and the Ministry of Defense, TiAl-based alloys are regarded as priority materials for development. Since then, TiAl-bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/14
CPCB22F9/14
Inventor 左振博兰剑韩志宇王庆相梁书锦张平祥
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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