Vacuum atomizing device and method for preparing 3D printing powder
An atomization device and 3D printing technology, applied in the field of 3D printing, can solve the problems of difficulty in controlling the surface smoothness of powder particles, and achieve the effects of reducing the solidification speed, increasing the spherical similarity, and improving the surface quality of the powder.
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Embodiment 1
[0021] Such as figure 1 As shown, this embodiment provides a vacuum atomization device, which includes a vacuum induction furnace 1, a tundish 2, a gas atomization device 3, an atomization cooling tower 4, and a powder collection system 5 connected in sequence. The device also includes a high-pressure gas supply system 6, the gas atomization device 3 includes a metal liquid nozzle 31 communicated with the tundish 2 and a gas nozzle 32 communicated with the high-pressure gas supply system 6, the vacuum atomization device Also includes a salt bath 7, the salt bath 7 is arranged above the gas atomization device 3, the salt bath 7 includes a salt bath nozzle 71, and the salt bath nozzle 71 communicates with the salt bath 7 , the salt bath nozzle 71 is arranged between the molten metal nozzle 31 and the gas nozzle 32 .
[0022] Wherein, a salt bath device 7 is added in the vacuum atomization device, and a salt bath nozzle 71 is set between the molten metal nozzle 31 and the gas no...
Embodiment 2
[0026] In this implementation, the method of using tool steel to prepare 3D printing powder is tested:
[0027] Step 1: For tool steel raw materials with the composition shown in Table 1, use pickling or grinding to remove the oxide rust layer on the surface, cut into small sections of 30-50 cm, and put them into the vacuum induction furnace 1 in the vacuum device for melting , vacuum, the vacuum degree is 100pa, set the power to 20kw, heat to ensure that the raw materials are completely melted, and open the sodium nitrate salt bath 7 at the same time to keep the temperature constant at 350°C;
[0028] Table 1 Chemical Composition of Raw Materials
[0029] C
Ti
mn
P
S
co
Mo
Ni
N
0.02
0.6
≤0.10
≤0.01
≤0.01
8.5
4.6
18.0
70ppm
[0030] Step 2: feed nitrogen into the gas atomization device 3, open the gas nozzle 32 of the high-pressure gas supply system 6, the pressure of the nozzle is 5MPa, spray through th...
Embodiment 3
[0034] In this implementation, the method of preparing 3D printing powder with rod-shaped Fe-Mn-Pt-based medical metal materials is tested:
[0035] Step 1: For tool steel raw materials with the composition shown in Table 1, use pickling or grinding to remove the oxide rust layer on the surface, cut into small sections of 30-50 cm, and put them into the vacuum induction furnace 1 in the vacuum device for melting , vacuum, the vacuum degree is 100pa, set the power to 20kw, heat to ensure that the raw materials are completely melted, and open the sodium nitrate salt bath 7 at the same time to keep the temperature constant at 350°C;
[0036] Table 2 Chemical Composition of Raw Materials
[0037] C
Al
mn
Pt
S
N
0.6
0.5
18
1
≤0.01
70ppm
[0038] Step 2: Pass nitrogen into the gas atomization device 3, open the gas nozzle 32 of the high-pressure gas supply system 6, the pressure of the nozzle is 5.5MPa, spray through the nozzle, a...
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