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
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[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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