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A kind of tial alloy powder and its preparation method and application

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: 2021-11-02
CENT IRON & STEEL RES INST
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  • Claims
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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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  • A kind of tial alloy powder and its preparation method and application
  • A kind of tial alloy powder and its preparation method and application
  • A kind of tial alloy powder and its preparation method and application

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preparation example Construction

[0025] The present invention provides a method for preparing the above-mentioned TiAl alloy powders of the embodiment, comprising the steps of:

[0026] The TiAl alloy bar finishing obtain TiAl alloy electrode rod; TiAl alloy rods comprising the mass percentage of the elements: 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 being Ti;

[0027] The TiAl alloy electrode rod loaded to the rotary shaft of the reaction chamber, the reaction chamber is evacuated to a vacuum state, and then to the vacuum reaction chamber charged with protective gas, to the TiAl alloy is used as the consumable electrode rod electrode by plasma rotating electrode method were TiAl alloy powders.

[0028] The TiAl alloy bar finishing obtain TiAl alloy electrode rod.

[0029] In the present invention, the TiAl alloy bar ...

Embodiment 1

[0040] The chemical composition of TIAL alloy bar is: Al: 37%, Nb: 4.8%, Cr: 2.5%, GD: 0.02%, C: 180PPM, N: 180PPM, H: 80PPM, o: 600PPM, margin TI;

[0041] The TiAl alloy rod of the above composition is formed into a TiAl alloy electrode rod having a diameter of 70 mm and a length of 700 mm, and the surface roughness is 0.4 μm; the TiAl alloy electrode rod is loaded to the rotating shaft of the reaction chamber, and the reaction Chamber to vacuum (1 × 10 -3 ~ 1 × 10 -2 PA), then charge Ar in a reaction chamber of the vacuum, a TiAl alloy powder was prepared by a plasma rotary electrode method, and the plasma arc current was 1700A, and the electrode rotation was 20000R / min.

[0042] The TIAL alloy powder chemical composition was: Al: 34%, Nb: 4.5%, CR: 2.4%, CD: 0.015%, C: 180PPM, N: 700PPM, H: 90PPM, o: 700PPM, and margin TI. The TiAl alloy powder particles are spherical morphology, and the particle size of the powder is 70 to 90 μm, the fluidity is 15 s / 50g, and the tiol all...

Embodiment 2

[0044] The chemical composition of TIAL alloy bar is: Al: 39%, Nb: 5.1%, Cr: 2.9%, GD: 0.015%, C: 200PPM, N: 100PPM, H: 80PPM, o: 500PPM, margin TI;

[0045] The TiAl alloy rod of the above composition is formed into a TiAl alloy electrode rod having a diameter of 60 mm and a length of 750 mm, and the surface roughness is 0.5 μm; the TiAl alloy electrode rod is loaded to the rotating shaft of the reaction chamber, and the reaction Chamber to vacuum (1 × 10 -3 ~ 1 × 10 -2 PA), then filled with AR in the reaction chamber of the vacuum state, a TiAl alloy powder was prepared by a plasma rotary electrode method, and the plasma arc current was 1800A, and the electrode rotation speed was 20000R / min.

[0046] The TIAL alloy powder chemical composition was: Al: 35%, Nb: 4.9%, Cr: 2.7%, GD: 0.01%, C: 90PPM, N: 600 ppm, H: 90PPM, N: 600PPM, and balance TI. The TIAL alloy powder particles are spherical morphology, the powder particle size is 70 ~ 80 μm, the fluidity is 17s / 50g, and the t...

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Abstract

The invention provides a TiAl alloy powder and its preparation method and application, belonging to the technical field of metal powder. The TiAl alloy powder includes the following elements by mass percentage: Al: 34%-35%, Nb: 4.5%-5.1%, Cr: 2.4%-2.7%, Gd: 0-0.02%, C: greater than 0 and not greater 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 700ppm, the balance being Ti; the TiAl alloy powder is spherical, with a particle size of 40μm-106μm, flowing The resistance is 10.0~20.0s / 50g, and the hollow ball rate is not more than 0.5%.

Description

Technical field [0001] The present invention relates to a metal powder technology, and particularly relates to a TiAl alloy powder and a preparation method and application. Background technique [0002] Additive manufacturing (3D printing) is a leading, pioneering and intelligent manufacturing technology, leading the profound changes in the traditional mode of production, is considered one of the source to promote the "fourth industrial revolution" in the medical device, huge application potential in the field of aerospace. Among them, metal additive manufacturing is the additive manufacturing industry growth rate in the fastest, most difficult technical sections. Metal additive manufacturing is of great significance for the promotion of quality improvement of high-end equipment and the leaps and bounds. [0003] Metal additive manufacturing techniques including the selection of electron beam melting (SEBM), electron beam deposition fuse (EBDM), selective laser melting (the SLM),...

Claims

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Application Information

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Patent Type & Authority Patents(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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