Device and method for preparing spherical titanium and titanium alloy powder

Abstract

The invention relates to a spherical titanium and titanium alloy powder preparation device and method. The device comprises a smelting chamber (12), an atomizing chamber (11), a rotating wheel (3), a smelting unit (4), a lifting device (5) and a primary powder collecting tank (7), the rotating wheel (3) is rotationally arranged in the smelting chamber (12) and located above the smelting unit (4), the smelting unit (4) moves through the lifting device (5), the smelting chamber (12) is communicated with the atomizing chamber (11), a communication port is located on the tangent line of the rotating wheel (3), and the primary powder collecting tank (7) is communicated with the atomizing chamber (11). The method comprises the following steps: a, alloy ingot smelting; b, atomizing molten drops; c, collecting powder; and d, screening the powder. And a rotating wheel is adopted to throw out the melt for heat exchange to prepare the spherical titanium or titanium alloy powder which is fine in granularity, low in hollow rate, high in sphericity degree and low in oxygen content. The problems that according to an existing spherical titanium and titanium alloy preparation method, the oxygen content, the hollow rate and the impurity content of powder are high are solved.

Description

technical field

[0001] The invention relates to a device and method for preparing spherical titanium and titanium alloy powder, and belongs to the field of 3D printing metal material preparation technology and equipment development. Background technique

[0002] At present, the preparation methods for 3D printing titanium powder mainly include electrode induction melting gas atomization (EIGA), plasma rotating electrode atomization (PREP), plasma spheroidization (PS) and plasma atomization (PA). )Wait. The hollow rate of 15-53μm titanium powder prepared by gas atomization method is about 0.6%, and the preparation of 1kg15-53μm titanium powder consumes 400kg of liquid argon; the rotating electrode method is limited by the rotation speed of the electrode, and the yield of -53μm powder is less than 10%. Increase the rotation speed Up to 40000rpm, the yield can reach 15%, but the equipment technical requirements are high; the powder impurity content of radio frequency plasma sp...

Examples

preparation example Construction

[0039] The preparation method of spherical titanium and titanium alloy powder comprises the following steps:

[0040] a. Melting of alloy ingots

[0041] Add the titanium ingot or titanium alloy ingot to the double-layer water-cooled copper crucible 42, keep the vacuum degree less than 0.1Pa, then fill it with argon, and make the titanium ingot or titanium alloy ingot melt on the double-layer water-cooled copper crucible 42 through the induction coil 41, Heating temperature is titanium ingot or titanium alloy ingot superheat degree 80 ~ 150 ℃;

[0042] b. Atomization of molten droplets

[0043] After the titanium ingot or titanium alloy ingot is completely melted and the liquid level is stable, the lower end of the rotating wheel 3 is placed under the liquid level of the double-layer water-cooled copper crucible 42, and the rotating wheel 3 rotates at a speed of 100,000 to 20,000 rpm, so that the molten droplet is under the action of centrifugal force, extending The parabola...

Embodiment 1

[0049] Adopt this device to prepare TC4 spherical titanium powder, and follow the following steps:

[0050] a. Melting of alloy ingots

[0051] Add the TC4 titanium ingot to the double-layer water-cooled copper crucible 42, vacuumize the device, the vacuum degree is 0.02Pa, then fill it with 99.999% argon, the pressure of the melting chamber 12 and the atomization chamber 11 is 115Kpa, turn on the power supply of the induction coil 41 The double-layer water-cooled copper crucible 42 is heated, and the heating temperature is 1760° C., until the ingot is completely melted.

[0052] b. Atomization of molten droplets

[0053] After the liquid level of the melt is stable, open the lifting device 5, and slowly raise the double-layer water-cooled copper crucible 42, and the rising speed of the liquid level is 50 μm / s; at the same time, turn on the motor 2, keep the rotating speed of the rotating wheel 3 at 20000 rpm, and the number of rotating wheels 3 20, the outer diameter of the...

Embodiment 2

[0060] Use this device to prepare TA0 spherical titanium powder, follow the following steps:

[0061] a. Smelting of titanium ingots

[0062] Put the TA0 titanium ingot into the double-layer water-cooled copper crucible 42, vacuumize the device, the vacuum degree is 0.08Pa, then fill it with 99.999% argon, the pressure of the melting chamber 12 and the atomization chamber 11 is 110Kpa, turn on the power supply of the induction coil 41 The double-layer water-cooled copper crucible 42 is heated at a temperature of 1800° C. until the ingot is completely melted.

[0063] b. Atomization of molten droplets

[0064] After the liquid level of the melt is stable, open the lifting device 5, slowly raise the double-layer water-cooled copper crucible 42, the liquid level rising speed is 20 μm / s, and turn on the motor 2 at the same time, the rotating speed of the rotating wheel 3 is 15000rpm, and the number of rotating wheels 3 is 10 The outer diameter of the rotating wheel 3 is 40cm, an...

technical field

[0001] The invention relates to a device and method for preparing spherical titanium and titanium alloy powder, and belongs to the field of 3D printing metal material preparation technology and equipment development. Background technique

[0002] At present, the preparation methods for 3D printing titanium powder mainly include electrode induction melting gas atomization (EIGA), plasma rotating electrode atomization (PREP), plasma spheroidization (PS) and plasma atomization (PA). )Wait. The hollow rate of 15-53μm titanium powder prepared by gas atomization method is about 0.6%, and the preparation of 1kg15-53μm titanium powder consumes 400kg of liquid argon; the rotating electrode method is limited by the rotation speed of the electrode, and the yield of -53μm powder is less than 10%. Increase the rotation speed Up to 40000rpm, the yield can reach 15%, but the equipment technical requirements are high; the powder impurity content of radio frequency plasma sp...

Examples

preparation example Construction

[0039] The preparation method of spherical titanium and titanium alloy powder comprises the following steps:

[0040] a. Melting of alloy ingots

[0041] Add the titanium ingot or titanium alloy ingot to the double-layer water-cooled copper crucible 42, keep the vacuum degree less than 0.1Pa, then fill it with argon, and make the titanium ingot or titanium alloy ingot melt on the double-layer water-cooled copper crucible 42 through the induction coil 41, Heating temperature is titanium ingot or titanium alloy ingot superheat degree 80 ~ 150 ℃;

[0042] b. Atomization of molten droplets

[0043] After the titanium ingot or titanium alloy ingot is completely melted and the liquid level is stable, the lower end of the rotating wheel 3 is placed under the liquid level of the double-layer water-cooled copper crucible 42, and the rotating wheel 3 rotates at a speed of 100,000 to 20,000 rpm, so that the molten droplet is under the action of centrifugal force, extending The parabola...

Embodiment 1

[0049] Adopt this device to prepare TC4 spherical titanium powder, and follow the following steps:

[0050] a. Melting of alloy ingots

[0051] Add the TC4 titanium ingot to the double-layer water-cooled copper crucible 42, vacuumize the device, the vacuum degree is 0.02Pa, then fill it with 99.999% argon, the pressure of the melting chamber 12 and the atomization chamber 11 is 115Kpa, turn on the power supply of the induction coil 41 The double-layer water-cooled copper crucible 42 is heated, and the heating temperature is 1760° C., until the ingot is completely melted.

[0052] b. Atomization of molten droplets

[0053] After the liquid level of the melt is stable, open the lifting device 5, and slowly raise the double-layer water-cooled copper crucible 42, and the rising speed of the liquid level is 50 μm / s; at the same time, turn on the motor 2, keep the rotating speed of the rotating wheel 3 at 20000 rpm, and the number of rotating wheels 3 20, the outer diameter of the...

Embodiment 2

[0060] Use this device to prepare TA0 spherical titanium powder, follow the following steps:

[0061] a. Smelting of titanium ingots

[0062] Put the TA0 titanium ingot into the double-layer water-cooled copper crucible 42, vacuumize the device, the vacuum degree is 0.08Pa, then fill it with 99.999% argon, the pressure of the melting chamber 12 and the atomization chamber 11 is 110Kpa, turn on the power supply of the induction coil 41 The double-layer water-cooled copper crucible 42 is heated at a temperature of 1800° C. until the ingot is completely melted.

[0063] b. Atomization of molten droplets

[0064] After the liquid level of the melt is stable, open the lifting device 5, slowly raise the double-layer water-cooled copper crucible 42, the liquid level rising speed is 20 μm / s, and turn on the motor 2 at the same time, the rotating speed of the rotating wheel 3 is 15000rpm, and the number of rotating wheels 3 is 10 The outer diameter of the rotating wheel 3 is 40cm, an...

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