A gas-solid fluidization method for preparing oxygen-free passivated titanium and titanium alloy powder products
A titanium alloy and powder technology, applied in the direction of gaseous chemical plating, additive manufacturing, metal processing equipment, etc., can solve the problems of large amount of coating on the surface of the powder, difficulty in achieving the coating effect, and difficult removal of sintering, etc. Uniform oxygen passivation layer, improved application environment and process, and easy control
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Embodiment 1
[0025] 30μm hydrodehydrogenation (HDH) pure titanium powder and VCl 4 The mass ratio is 80:20, and the concrete preparation steps are as follows:
[0026] (1) VCl meeting the formula requirements 4 and HDH pure titanium powder are respectively placed in the gasifier and the fluidized bed reactor;
[0027] (2) Heat the vaporizer to 180°C to make VCl 4 Vaporization, the VCl 4 Pass in the fluidized bed reactor together with dry argon according to volume ratio 20:80;
[0028] (3) Open the fluidized bed, and heat the fluidized bed to 300° C., feed the argon gas and metal halide gas to fluidize the titanium powder for 80 minutes, and obtain an oxygen-free passivated titanium powder after cooling;
[0029] (4) The oxygen-free passivated titanium powder obtained in step (3) is formed by an injection molding process using a polyoxymethylene-based binder system to obtain a green body;
[0030] (5) The green body obtained in step (4) is first deacidified at 120°C, then heated at 2°C...
Embodiment 2
[0032] 20μm gas atomized Ti-40Al titanium alloy powder and SnCl 4 The mass ratio is 92:8, and the whole operation and device are carried out under an argon protective atmosphere. Concrete preparation steps are as follows:
[0033] (1) SnCl that meets the formulation requirements 4 and Ti-40Al titanium powder are respectively placed in the gasifier and the fluidized bed reactor;
[0034] (2) Heat the vaporizer to 120°C to make SnCl 4 Gasification, the SnCl 4 Pass in the fluidized bed reactor together with dry argon according to volume ratio 15:85;
[0035] (3) Open the fluidized bed, and heat the fluidized bed to 150° C., feed the argon gas and metal halide gas to fluidize the titanium powder for 50 minutes, and obtain an oxygen-free passivated Ti-40Al titanium powder after cooling;
[0036] (4) The oxygen-free passivated titanium powder obtained in step (3) is pressed into shape using cold isostatic pressing;
[0037] (5) the green body obtained in the step (4) is placed...
Embodiment 3
[0039] -500 mesh ion spheroidized TC4 powder and SnCl 4 The mass ratio is 95:5, and the whole operation and device are carried out under an argon protective atmosphere. Concrete preparation steps are as follows:
[0040] (1) Metal halides and TC4 powder meeting the formula requirements are placed in the gasifier and the fluidized bed reactor respectively;
[0041] (2) Heat the vaporizer to 150°C to make SnCl 4 Gasification, the SnCl 4 Pass in the fluidized bed reactor together with dry argon according to volume ratio 10:90;
[0042](3) Open the fluidized bed, and heat the fluidized bed to 500° C., feed the argon gas and metal halide gas to fluidize the titanium powder for 30 minutes, and obtain an oxygen-free passivated titanium powder after cooling;
[0043] (4) The oxygen-free passivated titanium powder obtained in step (3) is carried out by gel injection molding using a low molecular weight gel system;
[0044] (5) Heat the green body obtained in step (4) in argon at 2...
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