TiAl alloy powder and preparation method and application thereof

An alloy powder and alloy electrode technology, applied in the field of metal powder, can solve the problems of unsatisfactory physical and chemical indicators such as powder hollowness, sphericity and particle uniformity, high content of impurity elements in TiAl alloy powder, and uneven powder particle size distribution. Long spheroidization time, low oxygen content and uniform particle size distribution

Active Publication Date: 2021-03-30
CENT IRON & STEEL RES INST
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AI Technical Summary

Problems solved by technology

The traditional preparation method of TiAl alloy powder is crucible melting gas atomization method, and the prepared TiAl alloy powder has problems such as high content of impurity elements, low powder sphericity and uneven particle size distribution.
Domestic high-quality TiAl alloy powder for electron beam powder bed additive manufacturing mainly relies on imports, and the high price of powder has become one of the bottlenecks restricting the rapid development of electron beam powder bed additive manufacturing technology in China.
Well-known foreign powder suppliers mainly use crucible-free vacuum induction fusion gas atomization (EIGA) to prepare TiAl alloy powder. High problem (about 1000ppm), and the physical and chemical indicators such as hollow rate, sphericity and particle uniformity of the powder are not ideal

Method used

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  • TiAl alloy powder and preparation method and application thereof
  • TiAl alloy powder and preparation method and application thereof
  • TiAl alloy powder and preparation method and application thereof

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preparation example Construction

[0025] The present invention provides the preparation method of TiAl alloy powder described in the above scheme, comprising the following steps:

[0026] Finishing the TiAl alloy rod to obtain a TiAl alloy electrode rod; the TiAl alloy rod includes the following elements in mass percentage: Al: 37%-39%, Nb: 4.7%-5.1%, Cr: 2.5% ~2.9%, Gd: 0~0.02%, C: more than 0 and not more than 150ppm, N: more than 0 and not more than 200ppm, H: more than 0 and not more than 100ppm, O: more than 0 and not more than 600ppm, the balance is Ti;

[0027] The TiAl alloy electrode rod is loaded on the rotating shaft of the reaction chamber, the reaction chamber is pumped to a vacuum state, and then a protective gas is filled into the vacuum state reaction chamber, and the TiAl alloy electrode rod is used as the self-consumption power Pole, using the plasma rotating electrode method to prepare TiAl alloy powder.

[0028] Finishing the TiAl alloy rod to obtain a TiAl alloy electrode rod.

[0029] ...

Embodiment 1

[0040] The chemical composition of TiAl alloy rods by mass percentage is: Al: 37%, Nb: 4.8%, Cr: 2.5%, Gd: 0.02%, C: 180ppm, N: 180ppm, H: 80ppm, O: 600ppm, the balance for Ti;

[0041] The TiAl alloy rod of the above composition is finished into a TiAl alloy electrode rod with a diameter of 70 mm and a length of 700 mm, with a surface roughness of 0.4 μm; the TiAl alloy electrode rod is loaded on the rotating shaft of the reaction chamber, and the reaction chamber The chamber is evacuated to a vacuum state (1×10 -3 ~1×10 -2 Pa), then fill Ar in the vacuum reaction chamber, and prepare TiAl alloy powder by plasma rotating electrode method, the plasma arc current is 1700A, and the electrode speed is 20000r / min.

[0042] The chemical composition of TiAl alloy powder obtained by mass percentage is: Al: 34%, Nb: 4.5%, Cr: 2.4%, Cd: 0.015%, C: 180ppm, N: 210ppm, H: 90ppm, O: 700ppm, balance For Ti. The TiAl alloy powder particles are spherical in shape, the powder particle size...

Embodiment 2

[0044] The chemical composition of TiAl alloy rods by mass percentage is: Al: 39%, Nb: 5.1%, Cr: 2.9%, Gd: 0.015%, C: 200ppm, N: 100ppm, H: 80ppm, O: 500ppm, the balance for Ti;

[0045] The TiAl alloy rod of the above composition is finished into a TiAl alloy electrode rod with a diameter of 60 mm and a length of 750 mm, with a surface roughness of 0.5 μm; the TiAl alloy electrode rod is loaded on the rotating shaft of the reaction chamber, and the reaction chamber The chamber is evacuated to a vacuum state (1×10 -3 ~1×10 -2 Pa), then fill Ar in the vacuum reaction chamber, and prepare TiAl alloy powder by plasma rotating electrode method, the plasma arc current is 1800A, and the electrode speed is 20000r / min.

[0046] The chemical composition of TiAl alloy powder obtained by mass percentage is: Al: 35%, Nb: 4.9%, Cr: 2.7%, Gd: 0.01%, C: 220ppm, N: 140ppm, H: 90ppm, O: 600ppm, the balance For Ti. The TiAl alloy powder particles are spherical in shape, the powder particle ...

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Abstract

The invention provides TiAl alloy powder and a preparation method and application thereof, and belongs to the technical field of metal powder. The TiAl alloy powder comprises, by mass percent, 34%-35%of Al, 4.5%-5.1% of Nb, 2.4%-2.7% of Cr, 0-0.02% of Gd, larger than 0 and not larger than 150 ppm of C, larger than 0 and not larger than 200 ppm of N, larger than 0 and not larger than 100 ppm of H,larger than 0 and not larger than 700 ppm of O and the balance Ti. The TiAl alloy powder is spherical, the particle size ranges from 40 micrometers to 106 micrometers, fluidity ranges from 10.0 s / 50g to 20.0 s / 50 g, and the hollow sphere rate is not larger than 0.5%.

Description

technical field [0001] The invention relates to the technical field of metal powders, in particular to a TiAl alloy powder and a preparation method and application thereof. Background technique [0002] Additive manufacturing (3D printing) is a leading and cutting-edge intelligent manufacturing technology, leading the profound transformation of traditional production methods, and is considered to be one of the driving forces of the "fourth industrial revolution". The application potential in fields such as aerospace is huge. Among them, metal additive manufacturing is the fastest growing and most technically difficult sector in the additive manufacturing industry. Metal additive manufacturing is of great significance to promote the quality improvement and leapfrog development of my country's high-end equipment. [0003] Metal additive manufacturing technologies mainly include electron beam selective melting (SEBM), electron beam fuse deposition (EBDM), laser selective melt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00B22F1/00B22F9/14B22F10/28B33Y70/00
CPCC22C14/00B22F9/14B33Y70/00B22F1/065
Inventor 赵琳彭云王虎田志凌马成勇曹洋
Owner CENT IRON & STEEL RES INST
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