3D PRINTING METHOD

Abstract

The present application provides a 3D printing method. The present application can provide as a method for efficiently performing 3D printing, for example, a 3D printing method capable of more rapidly and efficiently producing a three-dimensional shape precisely realized up to a fine portion.

Claims

1. A 3D printing method comprising a step of applying an electromagnetic field to a three-dimensional shape molded by using a metal powder containing a conductive metal having a relative magnetic permeability of 90 or more or a slurry containing the metal powder.

2. The 3D printing method according to claim 1, comprising steps of molding the metal powder or slurry in the electromagnetic field to the three-dimensional shape; molding the metal powder or slurry so as to have the three-dimensional shape after passing through the electromagnetic field or molding the metal powder or slurry to the three-dimensional shape and then applying the electric field thereto.

3. The 3D printing method according to claim 1, wherein the conductive metal has a conductivity of 8 MS/m or more at 20 C.

4. The 3D printing method according to claim 1, wherein the conductive metal is nickel, iron or cobalt.

5. The 3D printing method according to claim 1, wherein the metal powder or slurry comprises the conductive metal in an amount of 30 wt % or more based on the weight.

6. The 3D printing method according to claim 1, wherein the metal powder has a particle diameter of 50% particle size distribution in a range of 100 nm to 100 m.

7. The 3D printing method according to claim 1, wherein the metal powder is a spherical, flake, ellipsoid, needle or dendritic shape.

8. The 3D printing method according to claim 1, wherein the slurry comprises the metal powder and a binder.

9. The 3D printing method according to claim 8, wherein the binder is alkyl cellulose, polyalkylene oxide, polyalkylene carbonate, polyvinyl alcohol or lignin.

10. The 3D printing method according to claim 8, wherein the slurry comprises 5 to 200 parts by weight of the binder relative to 100 parts by weight of the metal powder.

11. The 3D printing method according to claim 1, wherein the electromagnetic field is formed by applying a current in a range of 100 A to 1,000 A.

12. The 3D printing method according to claim 1, wherein the electromagnetic field is formed by applying a current at a frequency in a range of 100 kHz to 1,000 kHz.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0034] FIG. 1 is a photograph of a three-dimensional shape obtained in Example 1.

MODE FOR INVENTION

[0035] Hereinafter, the present application will be described in detail by way of examples and comparative examples, but the scope of the present application is not limited to the following examples.

Example 1

[0036] 2 g of a nickel powder (spherical, particle diameter (D50) of 50% particle size distribution: about 7 to 8 m) and 0.2 g of ethyl cellulose were dispersed in 5 g of methylene chloride to prepare a slurry. Here, the nickel powder has a conductivity of about 14.5 MS/m at 20 C. and a relative magnetic permeability of about 600. Subsequently, the slurry was discharged by using a dispenser to form a three-dimensional shape (line shape), and the three-dimensional shape was calcined by applying an electromagnetic field to the three-dimensional shape. The electromagnetic field was formed by applying a current of 200 A at a frequency of about 350 kHz and the three-dimensional shape was maintained in the electromagnetic field for about 30 seconds.

Example 2

[0037] A three-dimensional shape was formed in the same manner as in Example 1 except that the amount of ethyl cellulose was changed to 2.5 g upon preparing the slurry, and an electromagnetic field was applied.

Example 3

[0038] A three-dimensional shape was formed in the same manner as in Example 1 except that a nickel powder having a needle shape and having a long axis length of about 10 m was used instead of the spherical nickel powder, and an electromagnetic field was applied.

Example 4

[0039] A three-dimensional shape was formed in the same manner as in Example 1 except that a nickel powder having a dendritic shape and having a long axis length of about 8 m was used instead of the spherical nickel powder, and an electromagnetic field was applied.

Example 5

[0040] A three-dimensional shape was formed in the same manner as in Example 1 except that a spherical iron (Fe) powder (spherical, particle diameter (D50) of 50% particle size distribution: about 6 to 8 m) was used instead of the nickel powder, and an electromagnetic field was applied. Here, the iron powder has a conductivity of about 13 MS/m at 20 C. and a relative magnetic permeability of about 100,000.

Example 6

[0041] 2 g of an iron (Fe) powder (spherical, particle diameter (D50) of 50% particle size distribution: about 6 to 8 m) and 0.5 g of methyl cellulose were dispersed in 5 g of water to prepare a slurry, and a three-dimensional shape was formed in the same manner as in Example 1. Thereafter, the three-dimensional shape was calcined by applying electromagnetic fields stepwise to the three-dimensional shape. To the three-dimensional shape, an electromagnetic field formed by applying a current of 100 A at a frequency of 200 kHz was applied for 10 seconds, an electromagnetic field formed by applying a current of 300 A at a frequency of 350 kHz was applied for 30 seconds and an electromagnetic field formed by applying a current of 500 A at a frequency of 380 kHz was applied for 10 seconds in sequence.

Example 7

[0042] A three-dimensional shape was formed in the same manner as in Example 6 except that polyvinyl alcohol was used instead of methyl cellulose, and an electromagnetic field was applied.

Example 8

[0043] A three-dimensional shape was formed in the same manner as in Example 6 except that a cobalt (Co) powder (particle diameter (D50) of 50% particle size distribution: about 10 to 14 m) was used instead of the nickel powder, and an electromagnetic field was applied. Here, the cobalt powder has a relative magnetic permeability of about 280 at 20 C.

Example 9

[0044] A three-dimensional shape was formed in the same manner as in Example 6 except that polypropylene carbonate was used instead of methyl cellulose, and an electromagnetic field was applied.

Comparative Example 1

[0045] A nickel wire (diameter: about 0.15 mm) was repeatedly discharged onto a substrate while passing through a solenoid coil (300 A, 370 kHz) to form a three-dimensional shape (line shape) in the same manner as in Example 1. However, when the nickel wires passing through the solenoid coil were laminated in a multilayer, adhesiveness between the layers was not sufficiently secured, and the portions not adhered were also confirmed, and the distinction between the layers was surely recognized.

Experimental Example. Resolution

[0046] It was confirmed whether a three-dimensional shape having a line-shaped thickness of about 100 m could be formed in each width of 10 m, 50 m, 100 m and 500 m by the methods of Examples and Comparative Example, respectively (resolution evaluation). Furthermore, each of the formed three-dimensional shapes was drawn transversely with a spatula to confirm retentive force of the three-dimensional shape. In the above step, if the three-dimensional shape was retained, it was marked as passed in Table 1 below, and if it was not retained, it was marked as failed in Table 1 below.

TABLE-US-00001 TABLE 1 Three-dimensional shape retentive force Resolution 10 m 50 m 100 m 500 m Evaluation width width width width Example 1 Formable to Passed Passed Passed Passed Example 2 10 m width Failed Passed Passed Passed Example 3 Failed Passed Passed Passed Example 4 Failed Passed Passed Passed Example 5 Failed Passed Passed Passed Example 6 Passed Passed Passed Passed Example 7 Failed Passed Passed Passed Example 8 Failed Failed Passed Passed Example 9 Failed Passed Passed Passed Compar- Not formable Not Not Passed Passed ative to 10 m measurable measurable Example 1 width and 50 m width

[0047] From the above results, it can be confirmed that according to the method of the present application, a very precise three-dimensional shape can be reliably formed, and it can be confirmed that the effect can be further improved through control of the ratio of the binder and the like.