KR101761649B1 - Metal powder-containing composition for three dimensional printing - Google Patents

Metal powder-containing composition for three dimensional printing Download PDF

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KR101761649B1
KR101761649B1 KR1020150161178A KR20150161178A KR101761649B1 KR 101761649 B1 KR101761649 B1 KR 101761649B1 KR 1020150161178 A KR1020150161178 A KR 1020150161178A KR 20150161178 A KR20150161178 A KR 20150161178A KR 101761649 B1 KR101761649 B1 KR 101761649B1
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South Korea
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metal powder
weight
dimensional printing
composition
binder
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KR1020150161178A
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Korean (ko)
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KR20170057710A (en
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차기룡
이상규
박정식
강찬중
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주식회사 쓰리디컨트롤즈
박정식
강찬중
차기룡
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    • B22F1/0059—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • B22F2003/1056—

Abstract

The present invention relates to a metal powder-containing composition for three-dimensional printing, which can produce a metal product requiring high precision together with high strength using a three-dimensional printing technique by using a raw material containing a metal powder as a feedstock for three- . In particular, the composition containing metal powder for three-dimensional printing according to the present invention is used as a raw material supplied to an extrusion head of a three-dimensional printer, and is produced by kneading and pulverizing and granulating a metal powder and a polymer binder.

Description

Technical Field [0001] The present invention relates to a metal powder-containing composition for three-dimensional printing,

The present invention relates to a metal powder-containing composition for three-dimensional printing, and more particularly, to a metal powder-containing composition for three-dimensional printing. More particularly, the present invention relates to a metal powder- The present invention relates to a metal powder-containing composition for three-dimensional printing.

A three-dimensional (3-dimensional) printer is a device for three-dimensionally shaping a three-dimensional object to have the same or similar shape as the object using three-dimensional data of the object to be printed. 3D printing is spreading in various fields. Such a three-dimensional printer has been used for purposes such as modeling and sample production before mass production. In recent years, however, a technical basis has been developed that can be used for mass production of a product capable of mass production centering on small- In addition to the automotive sector, many manufacturers are using it for making various models of medical human models, household products such as toothbrushes and razors.

The three-dimensional printer's product forming method is largely a so-called additive type in which a target object is formed in a two-dimensional plane form, that is, a three-dimensionally laminated material is melted and attached to form a shape, and a cutting There is brother. In this case, a wire or a filament made of a thermoplastic plastic is fed through a feed reel and a feed roll as a kind of additive type, and the filament is fed to an extrusion head mounted on a three- There is a filament melt lamination molding method in which a two-dimensional plane form (print layer) is repeatedly laminated on a plate to form a product having a three-dimensional shape to be printed.

Currently, the most commonly used material for 3D printing is photopolymer, a photocurable polymer material that solidifies when exposed to light. This accounts for 56% of the total market. The next most popular material is solid, free-standing, thermoplastics that occupy 40% of the market. The filament type of the thermoplastic plastic material is mainly used. The existing filament materials include polylactic acid (PLA), acrylonitrile butadiene styrene (ABS), high density polyethylene (HDPE), polycarbonate , PC) have been used.

However, such a plastic material as described above has a problem of low hardness, and there is a limitation that it is not bonded to form a steel product such as a metal part requiring high strength and high precision.

Korean Patent Publication No. 10-2015-0025865 (published on Mar. 11, 2015, entitled METAL RESIN COMPOSITION FOR 3D PRINTER)

An object of the present invention is to provide a metal powder which is used as a feedstock of a three-dimensional printer capable of forming a metal product which is excellent in mechanical properties and requires high precision by performing three-dimensional printing using a raw material containing a metal powder Containing composition.

It is also an object of the present invention to provide a composition containing metal powder that can ensure mechanical properties of a metal product formed by three-dimensional printing.

In order to accomplish the above object, the present invention provides a metal powder-containing composition for use as a raw material to be fed to a printhead of a three-dimensional printer, comprising a metal powder and a polymer binder, And granulating the mixture.

At this time, the metal powder may be an austenitic stainless steel powder having a steel composition of SUS-304L or SUS-316L.

In this case, the metal powder preferably contains 0.03 wt% or less of C, 1.0 wt% or less of Si, 1.0 wt% or less of Mn, 18 to 20 wt% of Cr, 10 to 12 wt% of Ni, 0.03 wt% or less of P, 0.03 wt% or less of S, and the balance of Fe and other unavoidable impurities.

In this case, the metal powder preferably contains 0.03 wt% or less of C, 1.0 wt% or less of Si, 1.5 wt% or less of Mn, 16 to 18 wt% of Cr, 11 to 14 wt% of Ni, 0.03 wt% or less of P, 0.03 wt% or less of S, and the balance of Fe and other unavoidable impurities.

At this time, the polymer binder may include a binder, a plasticizer, and a lubricant.

The metal powder-containing composition for three-dimensional printing according to the present invention is characterized in that the metal powder is 90.0 to 94.0 wt%, the binder is 3.0 to 5.0 wt%, the plasticizer is 2.5 to 3.5 wt%, and the lubricant is 0.5 to 1.5 % ≪ / RTI > by weight.

At this time, the binder may correspond to a polyethylene copolymer.

At this time, the plasticizer may correspond to paraffin wax (Paraffin wax).

At this time, the lubricant may correspond to stearic acid.

At this time, the metal powder-containing composition for three-dimensional printing according to the present invention is produced by assembling the metal powder and the polymer binder into a pellet kneaded at a temperature of 170 ° C or higher and having a predetermined particle size by a pelletizer .

According to the present invention, by performing three-dimensional printing using a raw material containing a metal powder, it is possible to mold a metal product which is excellent in mechanical properties and requires high precision.

In addition, according to the present invention, it is possible to provide a raw material containing a metal powder that can ensure mechanical properties of a metal product formed by three-dimensional printing.

1 is a view for explaining a three-dimensional printing system for performing three-dimensional printing using a metal powder-containing composition according to the present invention.
FIG. 2 is a graph showing the time-to-temperature change in the degreasing, sintering and cooling sections of a three-dimensional printing product made of the composition containing a metal powder according to the present invention.
FIG. 3 is a graph comparing the shrinkage degree of the three-dimensional printing product before and after sintering according to the content of the metal powder.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to the detailed description of the present invention, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 shows a three-dimensional printing system 10 for performing three-dimensional printing using a metal powder-containing composition according to the present invention. 1, the metal powder-containing composition 30 according to the present invention is produced by homogeneously kneading the metal powder 20a and the polymer binder 20b at a high temperature through a kneading machine 100, (Granulation) using pellets having a predetermined particle size and pulverization using a pellet. The metal powder-containing composition 30 thus prepared is laminated in a three-dimensional printing system 10 in a three-dimensional printing system 10 to form an extrusion head (hereinafter, referred to as " 310). The metal powder-containing composition 30 is melted and pressurized by the material feeder 200 so as to be smoothly supplied to the extrusion head 310 of the three-dimensional printer 300, and supplied to the extrusion head 310 . The metal powder containing composition 30 supplied to the extrusion head 310 is discharged onto the surface of the plate 330 in a manner similar to a hot melt adhesive gun to continuously stack the print layers in a three- Thereby forming a semi-finished product (semi-finished product) 40. The molded semi-finished product 40 is removed from the polymer binder component by the solvent and hot degreasing method in the degasser 400, sintered at a high temperature in the sintering furnace 500, and then cooled to room temperature to obtain a final steel (Manufactured) product 50 is carried out.

In order to form a high-strength steel product by a three-dimensional printing method, the present invention provides a composition in which metal powder is aggregated with a polymer binder as a raw material for three-dimensional printing as described above. Particularly, in order to produce such a composition, a metal powder obtained by powdering austenitic stainless steel having a steel composition of SUS-304L or SUS-316L is used as metal powder in the present invention.

The austenitic stainless steel is called Cr-Ni-based stainless steel, and Cr and Ni are added to Fe. The main components of the austenitic stainless steel are composed of Fe, Cr, and Ni, and other various additives shown in Table 1 below.

The following Table 1 shows a preferred example of austenitic stainless steel which is a component of a metal powder used for producing a composition containing metal powder for three-dimensional printing in the present invention, and the embodiment of the present invention is limited to this example only It is not.

ingredient C Si Mn Cr Ni Mo P S Other Composition 1
(mass%) 0.03
Below 1.0
Below 1.0
Below 18-20 10-12 0.2
Below 0.03
Below 0.03
Below The balance Fe and
Other unavoidable impurities Composition 2
(mass%) 0.03
Below 1.0
Below 1.5
Below 16-18 11-14 2 to 3 0.03
Below 0.03
Below The balance Fe and
Other unavoidable impurities

Carbon (C): 0.03 wt% or less

Carbon (C) may react with chromium (Cr) added to improve corrosion resistance, and may cause deterioration of corrosion resistance due to precipitation of chromium (Cr) carbide in the grain boundaries (precipitate chromium carbide in the grain boundary). Therefore, the content of carbon (C) is preferably as small as possible, and if carbon (C) is 0.03% by weight or less, the corrosion resistance is not remarkably lowered. Therefore, the content of carbon (C) is preferably 0.03% by weight or less.

Silicon (Si): 1.0 wt% or less

Silicon (Si) is an effective element for deoxidation and is added at the solvent stage. However, if the steel is excessively contained, the steel product extracted after degreasing and sintering may cause hardening of the stainless steel sheet, resulting in a decrease ductility. Therefore, the content of silicon (Si) 1.0% by weight or less is preferable.

Manganese (Mn): 1.5 wt% or less

Manganese (Mn) has the effect of reducing sulfur (S) dissolved in stainless steel by binding with sulfur (S) which is inevitably incorporated and suppressing segregation of the sulfur (S) of sulfur at the grain boundary to prevent cracking of the extracted steel products after degreasing and sintering. However, even if it is added in an amount exceeding 1.5% by weight, the effect of addition is scarcely increased. Rather, excessive addition leads to an increase in cost. Therefore, the content of manganese (Mn) is preferably 1.5% by weight or less.

Nickel (Ni): 10 to 14 wt%

Nickel (Ni) is an element that stabilizes the austenite phase and is added when an austenitic stainless steel is produced. At this time, if the content of nickel (Ni) exceeds 14% by weight, nickel (Ni) is consumed excessively, resulting in an increase in cost. Therefore, the content of nickel (Ni) is preferably 14% by weight or less.

Molybdenum (Mo): 3% by weight or less

Molybdenum (Mo) is an effective element for inhibiting local corrosion such as crevice corrosion of stainless steel. Therefore, it is effective to add molybdenum (Mo) when the steel product is used in harsh environments. However, if it is added in an amount exceeding 3% by weight, the stainless steel may become embrittlement and the productivity may be lowered, and excessive consumption of molybdenum (Mo) leads to an increase in cost. Therefore, the content of molybdenum (Mo) is preferably 3% by weight or less.

Phosphorus (P): 0.03% by weight or less

Since phosphorus (P) causes a decrease in ductility, it is preferable that the phosphorus (P) is low, but when it is 0.03% by weight or less, the ductility is not remarkably lowered. Therefore, the content of phosphorus (P) is preferably 0.03% by weight or less.

Sulfur (S): 0.03 wt% or less

Sulfur (S) is an element that lowers the corrosion resistance by forming manganese sulfide (MnS) by binding with manganese (Mn), and is preferably low. When it is 0.03% by weight or less, the corrosion resistance is not remarkably lowered. Therefore, the content of sulfur (S) is preferably 0.03% by weight or less.

The remainder is iron (Fe) and inevitable impurities.

In the present invention, it is preferable to use a metal powder having a particle size (D50) of 9.5 to 11 mu m for the austenitic stainless metal powder having the components and composition ratios of the composition 1 or 2 of Table 1. In addition, in order to increase the density of the finished steel product and to reduce the polymer binder content due to the small surface area of the powder, not only the degreasing can be performed smoothly, but also the uniform shrinkage is maintained during sintering, Based stainless steel powder is preferably a spherical metal powder which is pulverized. The manner of preparing the austenitic stainless metal powder is such that the liquidated (superheated) austenitic stainless metal stream is scattered by fine droplets and then spherical solid particles having a particle diameter (D50) To < / RTI >

The austenitic stainless steel powder, which is constituted by the composition and composition ratio of the composition 1 or 2 and spherically pulverized with a particle diameter (D50) of 9.5 to 11 mu m, is kneaded with a polymer binder including a binder, a plasticizer and a lubricant. At this time, the amount of the oxynitic stainless steel metal powder may be 90.0 to 94.0% by weight based on the total weight of the metal powder-containing composition, and the amount of the polymeric binder may be 6.0 to 10.0% by weight. If the amount of the polymeric binder is removed by the degreasing step described later, the shape of the semi-finished product 40 is not limited to the three-dimensional shape of the object to be printed However, if it exceeds 94.0% by weight, it is difficult to secure cohesion as a feedstock to proceed with three-dimensional printing by adding a small amount of the polymeric binder.

The binder is a backbone binder which is added to secure the cohesion required in the three-dimensional printing process due to the low binding force between the spherical powdered austenitic stainless steel powders. The binder is selected from the group consisting of polystyrene, polyethylene, polypropylene ), At least one copolymer selected from the group consisting of ethylene-vinylacetate, ethylene-ethylacrylate, methal-methacrylate, butyl-methacrylate, . Particularly, it is preferable that the binder to be added to the austenitic stainless steel metal powder is a polyethylene copolymer. The polyethylene copolymer is removed at a high temperature, while a steel product subjected to a hot degreasing process maintains its shape. The polyethylene copolymer preferably contains 3 to 5% by weight based on the total weight of the metal powder-containing composition.

The plasticizer is an organic material which is added to the aggregated composition by the combination of the austenitic stainless metal powder and the binder and facilitates the molding processing in 3D printing. The plasticizer is microcrystalline wax, Paraffin wax, (Montan wax) or the like may be used. Particularly, in the present invention, paraffin wax (Paraffin Wax) is added as a plasticizer which can lower the bonding force between the polymer binders even at a relatively low temperature to increase ductility. The paraffin wax is preferably contained in an amount of 2.5 to 3.5% by weight based on the total weight of the metal powder-containing composition.

The lubricant is added to the extrusion head 210 of the three-dimensional printer 200 via the supply induction pipe to improve the surface slip property at the time of pressure injection after the metal powder-containing composition is melted in the feeder, Stearic acid, oleic acid, palmitic acid, linolenic acid, and the like can be used as the component of the present invention. In the present invention, stearic acid is added. The stearic acid is preferably contained in an amount of 0.5 to 1.5% by weight based on the total weight of the metal powder-containing composition.

Austenitic stainless steel powder having the components and composition ratios of the above-mentioned composition 1 or 2 and a polymer binder which is uniformly dispersed for 1 hour at a high temperature of 170 占 폚 at which the polyethylene copolymer as a binder contained in the polymer binder is completely melted Followed by cooling to room temperature. The mixture thus cooled after the heat-kneading is pulverized in a pulverizer or a pelletizer and granulated with a pellet having a predetermined particle size, whereby a metal powder-containing composition is finally produced.

The metal powder-containing composition according to the present invention is formed into a steel product by the following process as a feedstock for three-dimensional printing. First, the above-described metal powder-containing composition is fed into a raw material feeder 200, melted and pressure-injected, and fed to an extrusion head 310 of a three-dimensional printer 300 through a feed induction pipe. Next, the molten metal powder-containing composition is discharged from the extrusion head 310 to the plate 330. The extrusion head 310 is moved in the X and Y axes relative to the upper surface of the plate 330 to stack one print layer and again move one layer in the Z axis and move in the X and Y axes as described above, Layers are stacked one on top of the other, and one layer is further raised in the Z-axis. The semi-finished product 40 having a three-dimensional three-dimensional shape of the object to be printed is formed by continuously printing.

The semifinished product 40 molded by the three-dimensional printer is subjected to a debinding process in the degasser 400. First, in a solvent degreasing process corresponding to a dewaxing process, a tetrahydrofuran or heptane The semi-finished product 40 is immersed in a Heptane solvent so that paraffin wax and stearic acid are primarily removed from the polymer binder contained in the semi-finished product 40. At this time, the solvent is degreased at a temperature of 25 to 35 ° C for at least 24 hours. If the temperature of the solvent is lower than 25 ° C, paraffin wax and stearic acid are rapidly removed from the semi-finished product 40, and cracks are easily generated in the semi-finished product 40. When the temperature of the solvent exceeds 35 ° C, the rate (removal rate) at which the paraffin wax and stearic acid are removed from the semi-finished product 40 is lowered within a certain period of time, and the paraffin wax and stearic acid remaining in the hot de- A crack easily occurs in the semi-finished product 40, and a solvent degreasing process takes a long time to achieve a desired removal rate. Further, when the semi-finished product 40 is immersed in a solvent at a temperature of 25 to 35 ° C for less than 24 hours, the removal rate of paraffin wax and stearic acid is lowered, and the paraffin wax and stearic acid remaining in the hot degreasing process are rapidly removed A crack may be generated in the semi-finished product 40.

Next, a hot degreasing process is performed to remove residual paraffin wax and stearic acid remaining in the semi-finished product (40) without being removed in the solvent degreasing process, and polyethylene air which is not dissolved in a tetrahydrofuran or heptane solvent The coalescence is removed by heating. At this time, the rate of temperature rise is important in removing the polymer binder from the semi-finished product 40 by the hot degreasing. Therefore, as in the temperature raising process in the degassing section of the time vs. temperature graph shown in FIG. 2, the temperature raising rate is kept low and the temperature retention time is set to be long for the temperature section in which each of the paraffin wax, stearic acid and polyethylene copolymer is removed. So that the paraffin wax, stearic acid and polyethylene copolymer can be more reliably removed from the semi-finished product 40. The total time required for conducting the hot degreasing is preferably not less than 40 hours, and it is preferable to conduct hot degreasing in a nitrogen (N 2 ) atmosphere in order to prevent oxidation of the austenitic stainless metal contained in the semi-finished product 40 Do. The temperature range of the degreasing zone is 500 ° C or less. However, when the semi-finished product 40 is moved in the sintering process after the completion of the degreasing process, the step of heating up to 900 ° C in a vacuum atmosphere and performing the first preliminary firing process can be performed. This is because the semi-finished product (40) subjected to the degreasing process is subjected to primary plasticization since the polymer binder is removed and it is difficult to handle. The semi-finished product 40 subjected to the primary firing process has a slight shrinkage of about 0.5 to 1.0% in shrinkage as compared with the semi-finished product 40 immediately after the degreasing process.

The semifinished product 40 from which the polymer binder has been removed in the degreasing step is sintered in the sintering furnace 500 and is extracted into a final steel product as a sintered body. In the sintering process, the semi-finished product 40 from which the polymer binder has been removed can be sintered by any one of sintering methods such as general sintering, pressure sintering and hot isostatic pressing, have. In the present invention, the semi-finished product (40) is sintered by general sintering and hot isostatic pressing. First, the general sintering process for the semi-finished product 40 proceeds in a vacuum atmosphere, and in the subsequent hot-water hydrostatic sintering and cooling process, sintering is performed in an argon (Ar) atmosphere. As shown in the time-temperature graph of FIG. 2, the sintering process is performed while the temperature is raised to 1,000 ° C in a vacuum atmosphere by a general sintering process, and then the sintering process is performed in an argon (Ar) After the temperature is elevated, the sintering process is carried out at 1,350 DEG C for 1 to 3 hours. Then, the semi-finished product 40 is finally cooled to room temperature to extract the steel product 50. The hot isostatic pressing process is a process for improving the physical and mechanical properties of the semi-finished product 40. The hot isostatic pressing process is a process in which the volatilization of chromium (Cr) and nickel (Ni) contained in the austenitic stainless steel of the semi- It is possible to obtain a homogeneous and dense steel product 50 by isotropically pressing and heating with an inert gas such as argon (Ar). At this time, the pressure of the argon (Ar) gas is preferably 1,000 to 1,200 bar.

In the case where the oustite-based stainless metal powder according to composition 1 (SUS-304L) or composition 2 (SUS-316L) is contained in an amount of 90.0 to 94.0% by weight based on the total weight of the composition containing the metal powder, The shrinkage percentage of the steel product 50 extracted after completion of the sintering / cooling process relative to the molded semi-finished product 40 immediately after the printing process is as shown in Fig. 3, when the oustite-based stainless metal powder according to composition 1 (SUS-304L) or composition 2 (SUS-316L) is contained in an amount of 90.0% by weight based on the total weight of the composition containing the metal powder, %, And when it is contained at 94.0% by weight, the shrinkage percentage is about 15.5% to 16% by weight. The shrinkage percentage of the metal powder in the section where the content of the oxynitic stainless metal powder according to the composition 1 (SUS-304L) or the composition 2 (SUS-316L) is 90.0 to 94.0% by weight based on the total weight of the composition containing the metal powder It can be confirmed that the number decreases linearly.

As described above, an optimal embodiment has been disclosed in the drawings and specification. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention, The scope should be determined by the technical idea of the appended claims.

10: 3D printing system
20a: metal powder 20b: polymer binder
30: Metal powder containing composition
40: Semifinished product
50: Steel products
100: kneader
200: Feeder
300: Three-dimensional printer 310: Extrusion head
400: rinsing machine
500: sintering furnace

Claims (10)

A metal powder-containing composition which is used as a raw material supplied to an extrusion head of a three-dimensional printer and composed of a metal powder and a polymer binder,
Wherein the metal powder is composed of 90.0 to 94.0 weight% and the polymer binder is 6.0 to 10.0 weight% in order to produce a steel product molded and degreased by three-dimensional printing and removing the polymer binder,
90.0 to 94.0% by weight of the metal powder and 6.0 to 10.0% by weight of the polymer binder are kneaded and granulated into a pellet having a predetermined particle size, and the mixture is injected into the extrusion head of the three-dimensional printer Wherein the composition is a metal powder for three-dimensional printing. The method according to claim 1,
Wherein the metal powder is an austenitic stainless steel powder having a steel composition of SUS-304L or SUS-316L. delete delete The method of claim 2,
Wherein the polymeric binder is composed of a binder, a plasticizer, and a lubricant. The method of claim 5,
Wherein the polymer binder comprises 3.0 to 5.0% by weight of the binder, 2.5 to 3.5% by weight of the plasticizer, and 0.5 to 1.5% by weight of the lubricant. The method of claim 6,
The metal powder-containing composition for three-dimensional printing, wherein the binder is a polyethylene copolymer. The method of claim 6,
Wherein the plasticizer is paraffin wax (Paraffin wax). The method of claim 6,
Wherein the lubricant is stearic acid. 2. The composition for three-dimensional printing according to claim 1, wherein the lubricant is stearic acid. The method of claim 6,
Wherein the metal powder and the polymeric binder are kneaded at a temperature of 170 DEG C or higher to produce a metal powder-containing composition for three-dimensional printing.
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KR102198017B1 (en) * 2019-08-28 2021-01-05 주식회사 네오엘에프엔 Material for metal FDM 3D printing to which nano size powder was added
KR102388845B1 (en) * 2019-09-27 2022-04-19 코오롱플라스틱 주식회사 Metal Powder-Containing Composition for 3D Printer and Filament for 3D Printer
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