KR100678589B1 - Multi-layer material and Munufacturing method therefor - Google Patents

Abstract

The present invention relates to a composite layer material and a method of manufacturing the same,

Homogeneously mixing two raw material powders with each binder to obtain a molding mixture for each raw material powder; Injecting a molding mixture forming a first layer of the obtained molding mixture into a mold by using a heterogeneous powder injection molding apparatus; Injecting a molding mixture constituting a second layer into a mold to form a composite layer molding in which the first layer and the second layer are integrally combined; Degreasing the binder from the molding; And sintering the degreased molding in a sintering furnace.

Various materials such as metals or ceramics are manufactured as one material in the form of a composite layer, but are realized through a simple process.

Composite layer materials, manufacturing

Description

Multi-layer material and Munufacturing method therefor}

1 is a flow chart of a method of manufacturing a composite layer material according to an embodiment of the present invention,

Figure 2a to 2i is a schematic diagram showing a heterogeneous powder injection molding process in the production of a composite layer material according to an embodiment of the present invention,

3 is a flow chart of a method for producing a composite layer material according to another embodiment of the present invention,

4 is a flow chart of a method for producing a composite layer material according to another embodiment of the present invention,

Figure 5 is a schematic diagram showing a multi-powder injection molding process in the production of a composite layer material according to another embodiment of the present invention,

6A and 6B are tissue photographs of the composite layer material prepared according to one embodiment of the present invention,

7A and 7B are tissue photographs of a composite layer material prepared by another embodiment of the present invention,

8 is a schematic view showing various examples of the composite layer material produced by the present invention.

<Description of Symbols for Main Parts of Drawings>

10: fixed mold 22: first moving mold

22a: injection hole 24: second moving mold

24a: injection hole 100: first layer

200: second layer 210: hopper for raw material supply

220: plasticization cylinder 230: injection screw

240: mold 242: injection hole

250: nozzles A1, B1, C1: molding mixture

A2, B2, C2: composite layer

The present invention relates to a composite layer material and a method for manufacturing the same, and more particularly, to a method of manufacturing a variety of materials such as metals and ceramics in a single layer in the form of a composite layer, in particular by applying a powder injection molding at a low cost A method for producing a composite layer material having high functionality and a composite layer material produced thereby.

Various types of processing methods have been proposed to manufacture various tool materials or machine parts. Among these processing methods, powder metallurgy which obtains a metal product of the desired form by pressurizing and shaping | molding a metal powder, hardening | curing, and heating and sintering has attracted the spotlight.

Powder metallurgy enables the manufacture of products that are otherwise difficult or impossible to manufacture with other processing methods such as casting and forging.

For example, high-temperature materials such as tungsten, molybdenum, tantalum, refractory, ceramics, etc., which have a high melting temperature, are difficult to be manufactured through a melting method, but can be manufactured using powder metallurgy.

Alloys of non-soluble metals (tungsten-copper, iron-palladium), composite materials such as cemented carbide (tungsten carbide-cobalt), dispersion reinforcing materials, electrical contact materials, Composite materials of metal-nonmetals such as copper-graphite, materials having a layered structure such as dental amalgam, and the like can also be manufactured through powder metallurgy.

Porous materials such as bearings, filters or sponge-like materials cannot be obtained as castings but can be manufactured with powder metallurgy.

On the other hand, in recent years, such a powder metallurgy to manufacture a product consisting of a composite material of metal-heterometal, metal-non-metal, or to manufacture a product in the form of a composite layer material in which these materials form a separate layer integrally combined The trend is in the spotlight.

For example, in the case of a mechanical part, the main body part is formed by a general metal powder layer, and the part which is rubbed with other parts is formed by a mixed metal powder layer to which wear resistant powder is added.

However, the technique of manufacturing a composite layer material using powder metallurgy has the following limitations.

First of all, in order to manufacture a molded body using powder, each powder layer injected into the mold must be pressed by a mechanism such as a punch. It was difficult to make.

In addition, since the process of injecting each powder layer into the mold is actually a situation that greatly depends on the manual work, there is a problem that the productivity is greatly reduced and the production cost increases. In particular, this problem is more serious when the heterogeneous powder layer is formed in multiple layers.

The present invention has been made in view of the above problems, and is a method of manufacturing various materials such as metals or ceramics into a single layer in the form of a composite layer, and in particular, by applying powder injection molding to have high functionality at low cost It is an object to provide a method for producing a composite layer material.

Moreover, another object of this invention is to provide the composite layer material manufactured by such a manufacturing method.

The present invention for achieving the above object, the step of homogeneously mixing the two kinds of raw material powder with each binder, to obtain a molding mixture for each raw material powder; Injecting a molding mixture forming a first layer of the obtained molding mixture into a mold by using a heterogeneous powder injection molding apparatus; Injecting a molding mixture constituting a second layer into a mold to form a composite layer molding in which the first layer and the second layer are integrally combined; Degreasing the binder from the molding; And sintering the degreased molding in a sintering furnace.

More preferably, the heterogeneous powder injection molding apparatus includes one fixed mold and two moving molds, and after forming a first layer by injecting a molding mixture into a space formed by the fixed mold and the first moving mold, The first mold is demolded and a second mixture is formed by injecting a molding mixture into the space formed by the fixed mold and the second movable mold while the second movable mold is closely fixed to the fixed mold.

According to another aspect, the present invention comprises the steps of homogeneously mixing at least two kinds of raw powder with each binder to obtain a molding mixture for each raw powder; Injecting a molding mixture forming a first layer of the obtained molding mixture into a mold by using a heterogeneous powder injection molding apparatus; Sequentially injecting the molding mixture constituting the second layer into the molding mixture constituting the last layer into the mold to form a composite layer molding integrally bonded from the first layer to the last layer; Degreasing the binder from the molding; And sintering the degreased molding in a sintering furnace.

More preferably, the heterogeneous powder injection molding apparatus includes one fixed mold and at least two moving molds, and after forming a first layer by injecting a molding mixture into a space formed by the fixed mold and the first moving mold, The first moving mold is demolded and the second moving mold is fixed to the fixed mold to inject a molding mixture into the space formed by the fixed mold and the second moving mold to form a second layer. Repeat the same process to form the last layer.

According to another aspect, the present invention comprises the steps of homogeneously mixing at least two kinds of raw powder with each binder to obtain a molding mixture for each raw powder; Using a multi-powder injection molding apparatus, a composite layer molding in which the molding mixture forming the first layer from the molding mixture forming the first layer to the molding mixture forming the last layer is injected into the mold, and integrally joined from the first layer to the last layer. Forming a; Degreasing the binder from the molding; And sintering the degreased molding in a sintering furnace.

More preferably, the multi-powder injection molding apparatus is provided with at least two nozzles for injecting the molding mixture into the mold for each layer formation position, and simultaneously injections the molding mixture constituting each layer into the mold through the nozzles. Form a composite layer molding integrally bonded from one layer to the last layer.

More preferably, the raw material powder forming each layer is selected from the group consisting of metal powder, ceramic powder, carbide powder, glass powder, oxide powder, diamond powder or mixtures thereof.

More preferably, the binder is an organic binder, the molding mixture for each raw material powder is composed of the raw material powder 40 ~ 60 vol% and the remaining amount of the binder.

More preferably, the raw material powder and the binder are mixed homogeneously for 2 to 3 hours at a temperature condition of 80 ~ 150 ℃.

More preferably, the injection is made at an injection pressure of 1000 ~ 3000 psi in a state where the molding mixture is heated to 150 ~ 500 ℃.

More preferably, the degreasing is carried out in a pyrolysis method in a vacuum furnace, by heating at a temperature increase rate of 20 ~ 35 ℃ / hr from 80 ℃ to 600 ℃.

More preferably, the sintering is carried out under a reducing hydrogen atmosphere or a nitrogen atmosphere, when the raw material powder is made of metal powder or diamond powder, mixed powder thereof, the first temperature condition of 500 ~ 1300 ℃, the raw material powder is ceramic powder or When the powder is composed of carbide powder, glass powder, oxide powder, and mixed powder thereof, the second temperature condition of 1000 to 1500 ° C, and the raw material powder is a mixed powder of the powder of the first temperature condition and the powder of the second temperature condition It is made for a predetermined time while the third temperature condition of 500-1300 ° C is maintained.

The present invention applies powder injection molding to produce a product in the form of a composite layer material in which various materials, such as a metal, a nonmetal, a mixture of metal and dissimilar metals, and a mixture of metal and nonmetal, form a separate layer and are integrally bonded.

Powder Injection Molding (PIM) is a fusion of injection molding technology developed in the plastics field and metal powder sintering technology developed in the powder metallurgy field. Its existing technologies such as cutting, precision casting, die casting and powder metallurgy It is a high-tech processing technology that enables mass production of high-performance complex precision parts that are difficult to manufacture or costly at low cost.

The general powder injection molding is composed of mixing process of powder and binder, injection molding process, debinding process, sintering process, etc. It is further classified into metal injection molding (MIM) or ceramic injection molding (CIM).

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a flow chart of a method of manufacturing a composite layer material according to an embodiment of the present invention, Figures 2a to 2i is a schematic diagram showing a heterogeneous powder injection molding process in the production of a composite layer material according to an embodiment of the present invention. .

First, two kinds of raw powders are mixed homogeneously with each binder to obtain a molding mixture for each raw powder.

As the raw material powder, metal powder, ceramic powder, carbide powder, glass powder, oxide powder and diamond powder are used. A mixed powder in which two or more of these powders are mixed as necessary may be used.

As the metal powder, for example, a powder made of Co, Cr, Fe, Cu, Zn, Ti, Ni, Ag, Sn, W, B, Mn, or an alloy thereof is used. As the carbide powder, for example, WC, TiC, CrC and the like are used, and as the ceramic powder, Zr, Si and the like are used.

The raw material powder is prepared in a size of about 1 to 20 μm. In the case of a larger size, the sintering property and the injection moldability are generally relatively poor and the strain due to shrinkage is large. This is because uniform mixing with is difficult and the price is relatively high. However, the size of the raw material powder may be nano-size if the characteristics of the material is prioritized without considering the price, may be a size of several tens to several hundred μm in some cases.

As the binder, a conventional organic binder selected according to the raw material powder is used. For example, paraffin wax, vinyl acetate, polyolefin, ethylene vinyl acetate, and the like are used. Particularly, as the water-soluble binder, polyethylene glycol, polypropylene glycol, polyvinyl Alcohol and the like are used, and polystyrene, polyethylene and the like are used as the water-insoluble binder.

Each raw material powder and the binder are homogeneously mixed at a ratio of 40 to 60 vol% of the raw material powder and the remaining amount of binder, and then mixed for 2 to 3 hours at a temperature condition of 80 ~ 150 ℃. This mixing can be accomplished using, for example, a conventional double planetary mixer or the like.

When the raw material powder is less than 40 vol%, the fluidity during injection is good, but it takes a long time when degreasing. When the raw material powder is more than 60 vol%, the molding may not have sufficient strength during injection. .

In addition, when the mixing is performed at a temperature lower than the above conditions or for a short time, the binder may not be mixed with sufficient fluidity. If the mixing is performed at a temperature above or above the above conditions, the binder may be degreased during mixing. Therefore, it is preferable to maintain the above mixing conditions.

As a result of the mixing, a molding mixture in which the raw material powder particles are wrapped in a binder is obtained. The molding mixture may be in the form of agglomerates by mutual bonding of the binders, but may be in the form of a powder by a slight pressing force. Easily shredded.

Next, by using a heterogeneous powder injection molding apparatus, the molding mixture constituting the first layer of the obtained molding mixture is injected into the mold, and the molding mixture constituting the second layer is injected into the mold. The layers form integrally formed composite layer moldings.

Injection molding is one of the processing methods for forming a plastic material, especially a thermoplastic resin, and is a method of manufacturing a molded product by heating and melting a resin and then injecting it into a mold.

In particular, the heterogeneous injection molding is an injection molding method used for producing heterogeneous resins having different colors from one molding, for example, and is used for the manufacture of casings, keypads, and the like for home appliances. This heterogeneous injection molding is applied.

The heterogeneous powder injection molding apparatus of this embodiment has a conventional configuration provided with a hopper for raw material supply, a plasticizing cylinder, an injection screw, a mold, and the like, in particular, one fixed mold 10 and It has two moving molds 22 and 24.

In the injection process, the injection molding 22a of the first movable mold 22 is injected into the space formed by the fixed mold 10 and the first movable mold 22 to form the first layer 100. 2a to 2c. The shape of the inner surface of the first moving mold 22 may be modified in various forms according to the shape of the second layer 200 required.

Thereafter, the first moving mold 10 is demolded (FIG. 2D), and the second moving mold 24 is fixed to the fixed mold 10 closely (FIGS. 2E to 2F). In this state, the fixed mold 10 ) And the molding mixture is injected through the injection hole 24a of the second moving mold 24 in the space formed by the second moving mold 24 to form the second layer 200 (FIG. 2G). Although the inner surface of the illustrated second moving mold 24 is formed to have a flat surface, this may also be modified in various forms according to the shape of the second layer 200 required.

Subsequently, when the second moving mold 20 is demolded (FIG. 2H), a composite layer molding in which the first layer 100 and the second layer 200 are integrally combined (FIG. 2I) is obtained.

This injection is preferably made at an injection pressure of 1000 ~ 3000 psi in a state where the molding mixture is heated to 150 ~ 500 ℃.

If the injection temperature is lower than 150 ℃ may not be uniform injection molding because the fluidity of the molding mixture is not good, if higher than 500 ℃ may cause the evaporation of the binder, it is preferable to inject under the above conditions.

In addition, when the injection pressure is lower than 1000 psi, the molding mixture may not be injected smoothly from the nozzle, when the injection pressure is higher than 3000 psi, the powder injection molding apparatus may be overloaded, it is preferable to inject under the above conditions.

In particular, the injection is preferably performed by a three-point heating method under the above conditions. The three-point heating method controls heating and flow at at least three points such as an inlet, a break point, and an outlet through which the molding mixture is injected during the injection molding machine. This is how it is done.

Next, the binder is degreased from the molded product.

Degreasing is a process of removing the binder added to the mutual binding of the raw material powder in the molding, in this embodiment degreasing is carried out by pyrolysis in a vacuum furnace, in particular in the temperature rise of 20 ~ 35 ℃ / hr from 80 ℃ to 600 ℃ By heating at a rate.

Looking at the degreasing process in more detail, a passage for degreasing the binder is formed in the injection molding in the initial temperature range, the degreasing of the low temperature binder is performed in the intermediate temperature range, and degreasing of the high temperature binder is performed sequentially in the high temperature range. . In this respect, it is preferable that degreasing is performed within the above temperature range.

In addition, from the technical aspect of the degreasing process, it is preferable that the temperature increase rate is low, but if the temperature increase rate is too low, the high temperature atmosphere of the vacuum furnace must be maintained for a long time, and as a result, the production cost is increased and the operating time is increased. It is desirable in terms of actual manufacturing to keep the rate of heating as high as possible under the conditions achieved. However, if the temperature increase rate is excessively high, since the warping and internal cracks, pores, swelling phenomenon may occur when degreasing, degreasing is preferable as the temperature increase rate.

The temperature increase rate of the vacuum furnace has an average meaning, and may be a method of continuously raising the temperature at a constant rate during the degreasing process, and if necessary, the process may be performed to include a process of temporarily stopping the temperature increase and maintaining a fixed temperature in the middle. It can also be operated.

On the other hand, in such a degreasing process, the degreasing process of the solvent extraction method may be further subjected, but the solvent extraction method is a method of eluting and removing the binder by immersing the injected molding in a solvent.

At this time, the solvent used may vary depending on the type of the binder, for example methanol, butanol, hexane, dichromemethanol and the like can be used.

When such a solvent extraction degreasing process is added, it is preferable to make it go through as a previous stage of a thermal decomposition degreasing process.

Next, the degreased molding is sintered in a sintering furnace.

Sintering is performed under a reducing hydrogen atmosphere (or nitrogen atmosphere), but may be performed in a separate sintering furnace, but the sintering furnace may be configured by injecting hydrogen gas into a vacuum furnace in which degreasing is completed. When sintering is carried out under such a reducing hydrogen atmosphere, oxygen remaining in the molding is removed, so that voids are removed to obtain a dense structure, and the oxidation of the molding is also prevented.

When the raw powder is composed of metal powder or diamond powder, and mixed powder thereof, the raw powder is sintered under the first temperature condition of 500 to 1300 ° C. The raw powder is ceramic powder or carbide powder, glass powder, oxide powder, and mixed powder thereof. In this case, sintering is carried out under a second temperature condition of 1000 to 1500 ° C.

When the raw material powder is a mixed powder of the powder at the first temperature condition and the powder at the second temperature condition, the raw powder is sintered at a third temperature condition of 500 to 1300 ° C.

If the powder is sintered at a temperature lower than this temperature condition, the powder may not have sufficient hardness. At higher temperatures, the sintered powder may be thermally damaged, so it is preferable to maintain such a temperature condition.

At this time, the sintering process is performed for a predetermined time set according to the characteristics of each raw material powder or molding under the above temperature conditions. Such sintering time may be, for example, a time of about several minutes, or may be about 2 to 3 hours depending on the characteristics of the raw material powder or the molding.

An embodiment of another aspect of the present invention will be described.

3 is a flow chart of a method for producing a composite layer material according to another embodiment of the present invention.

In the above-described embodiment, a composite layer material was formed using two kinds of raw powders. In this embodiment, a composite layer material using two or more kinds of raw powders is manufactured by further applying the illustrated heterogeneous powder injection molding apparatus.

First, two or more kinds of raw material powders are mixed homogeneously with each binder to obtain a molding mixture for each raw material powder.

Next, by using a heterogeneous powder injection molding apparatus, a molding mixture constituting the first layer of the obtained molding mixture is injected into the mold, and then sequentially injected into the mold from the molding mixture constituting the second layer to the molding mixture constituting the last layer. Thereby forming a composite layer molding integrally joined from the first layer to the last layer.

The heterogeneous powder injection molding apparatus of this embodiment has a conventional configuration provided with a hopper for supplying raw materials, a plasticizing cylinder, an injection screw, a mold, and the like, in particular, one fixed mold and two or more movements for sequentially injecting different materials. It has a mold.

In the injection process, the injection molding mixture is injected into the space formed by the fixed mold and the first moving mold to form a first layer, and then the first moving mold is demolded and the second moving mold is fixed to the fixed mold. The molding mixture is injected into the space formed by the second moving mold to form the second layer, and the same process as the injection of the second layer is repeated to form the last layer.

Next, the binder is degreased from the molding and then sintered in a sintering furnace to obtain a final composite layer material.

Specific process conditions for each step may be applied in the same manner as in the above-described embodiment, and thus redundant descriptions thereof will be omitted.

In the case of producing a so-called warp functional material, two or more kinds of powders may be mixed, but a mixed powder of a form in which only the mixing ratio is changed in several steps may be used. For example, A powder and B powder are mixed, but four kinds of mixed powders in which the mixing ratio is changed in a step of 1: 4-> 2: 3-> 3: 2-> 4: 1 are used.

The present embodiment may be particularly useful in the case of manufacturing such warp functional material, and may be usefully applied in the case of forming two or more materials as one composite layer material.

Upon completion of this sintering, various types of composite layer materials can be obtained, as illustrated in FIG. 8.

(A) or (c) of FIG. 8 is a case where two materials A and B are formed as one composite layer material, and (b) is a case where three materials A, B and C are formed as one composite layer material.

Taking (c) of FIG. 8 as an example, it may be configured in the form of A (low cost material) -B (expensive material), or may be configured in the form of A (soft material) -B (hard material), Various material layers may be formed as one composite layer material, such as may be configured in the form of A (metal) -B (ceramic).

Such composite layer materials are required in terms of function and price, for example, watch bands, office equipment parts, electronic parts, parts of military equipment, parts in the semiconductor field, parts in the automotive field, and parts for machine tools. It can be used in various fields.

An embodiment of another aspect of the present invention will be described.

Figure 4 is a flow chart of a method for producing a composite layer material according to another embodiment of the present invention, Figure 5 is a schematic diagram showing a multi-powder injection molding process in the production of a composite layer material according to another embodiment of the present invention.

The two embodiments described above form a composite layer material using two or more types of raw powders, and apply a heterogeneous powder injection molding apparatus to sequentially perform injection molding for each material layer.

In contrast, in the present embodiment, a composite layer material is formed using two or more raw powders, and multiple powder injection molding apparatuses are applied to simultaneously inject two or more molding mixtures into each mold part.

First, two or more kinds of raw material powders are mixed homogeneously with each binder to obtain a molding mixture for each raw material powder.

Next, by using a multiple powder injection molding apparatus, a composite layer which is injected into the mold from the molding mixture forming the first layer to the molding mixture forming the last layer in the obtained molding mixture, and integrally bonded from the first layer to the last layer. Form a molding.

The multi-powder injection molding apparatus of this embodiment has a conventional configuration provided with a hopper 210 for raw material supply, a plasticizing cylinder 220, an injection screw 230, a mold 240, and the like, in particular, a heterogeneous material (A1). At least two nozzles 250 and injection holes 242 for injecting the molding mixture into the mold in order to simultaneously inject the B1 and C1 into the respective parts are provided for each of the formation positions of the layers A2, B2 and C2.

In injection molding, the molding mixtures A1, B1, and C1 constituting each layer are simultaneously injected into the mold 240 through the nozzles 250 and the injection holes 242, and the final layer A2, B2, C2) to form a composite layer molding integrally combined.

In the multi-powder injection molding, two or more kinds of materials are injected at the same time, thereby producing a final product through the following process.

First, the number and position of nozzles into which the molding mixture is injected in each layer is determined according to the shape and thickness of the material layer required, and the flow path of the raw material flowing into the mold and the boundary point of each raw material formed in the molding based on the determined data. The simulation is performed by computer.

In the simulation process, the characteristics of the injection material and the injection conditions accordingly are considered together, and the above process is repeated so that the simulation result can be matched with the shape and thickness of the material layer required, and thus the number and position of the final nozzles, etc. The injection conditions will be determined.

Next, the binder is degreased from the molding and then sintered in a sintering furnace to obtain a final composite layer material.

Specific process conditions for each step may be applied in the same manner as in the above-described embodiment, and thus redundant descriptions thereof will be omitted.

This embodiment further provides the advantage that a multi-layered composite material can be manufactured by a single injection process.

<Example>

A) Co-Fe-based, B) Co-based and C) Fe-based metal powders having a size of 1 to 5 μm were prepared as raw material powders, and low density polypropylene (LDPE), high density polypropylene (HDPE), Ethylene vinyl acetate (EVA), wax (WAX), stearic acid (Stearic Acid) were prepared.

Each prepared metal powder was mixed with the binder in a ratio of 1: 1, and was mixed for 2 hours while heated to a temperature of 120 ° C. using a double planetary mixer, and moldings corresponding to A) to C) were performed. Each mixture was obtained.

Next, using a heterogeneous powder injection molding apparatus, a composite layer molding made of the molding mixture of A) -B) is injected, and another composite layer molding made of the molding mixture of A) -C) is separately injected. It was.

Injection was achieved by a three-point heating method, with all three points at an injection pressure of 2000 psi while being maintained at temperatures below 300 ° C.

Next, degreasing was carried out for each of the moldings by pyrolysis using a vacuum furnace. The vacuum furnace in the room temperature was heated to raise the temperature, but the average temperature increase rate during degreasing was 30 ℃ / hr, and the following temperature maintenance process was included during the temperature increase.

i) hold at 130 ° C. for 1 hour

ii) hold at 300 ° C. for 1 hour

iii) hold at 420 ° C. for 2 hours

Next, the molded product was sintered through a process subsequent to the degreasing process.

To this end, the vacuum furnace was continuously heated even after the degreasing step was completed, and hydrogen gas was injected into the inside of the vacuum furnace to form a reducing hydrogen atmosphere. In this state, the mixture was maintained at a temperature of 1000 ° C. for 2 hours and then cooled in a furnace.

6A is a tissue photograph of a composite layer material prepared according to an embodiment of the present invention, and FIG. 7A is a tissue photograph of a composite layer material prepared according to another embodiment of the present invention. 6B and 7B are tissue photographs further illustrating FIGS. 6A and 7A.

According to the tissue photograph, both the first layer and the second layer are divided into separate layer structures, both of the composite layer molding consisting of the molding mixture of A) -B) or another composite layer molding of the molding mixture of A) -C). It is confirmed that the tissue is produced as one continuous layer.

The present invention described above can be embodied in many different forms without departing from the spirit or main features thereof. Therefore, the above embodiments are merely examples in all respects and should not be construed as limiting.

The present invention, while manufacturing a variety of materials such as metal or ceramic as a single material in the form of a composite layer, it is implemented through a simple process.

In addition, since the present invention is applied to the powder injection molding method, it is possible to mass-produce a high-functional complex shape composite layer material that was difficult or expensive to manufacture with conventional powder metallurgy at low cost.

In addition, the present invention enables the use of an automated powder injection molding apparatus, thus providing the effect of greatly improving productivity and reducing production costs in the production of composite layer materials.

Claims (13)

A nozzle and an injection hole for injecting a molding mixture into a mold to inject two kinds of materials into parts are provided for each molding position of each material, and each injection hole is provided with a raw material mixing hopper, a plasticizing cylinder, and an injection screw. (II) In the method for producing a composite layer material using a powder injection molding apparatus, Mixing two kinds of raw powders homogeneously with each binder, wherein each of the raw powders comprises 40 to 60 vol% of the corresponding raw powder and the remaining amount of binder, thereby obtaining a molding mixture for each raw powder; Using the double powder injection molding apparatus, injecting a molding mixture constituting a first layer of the obtained molding mixture into the mold through one of the injection holes; By using the double powder injection molding apparatus, the molding mixture constituting the second layer is injected into the mold simultaneously or sequentially with the injection of the molding mixture constituting the first layer through the other one of the injection holes. Forming a composite layer molding in which the first layer and the second layer are integrally bonded; Degreasing the binder from the molding; And sintering the degreased molded product in a sintering furnace. A plurality of nozzles and injection holes for injecting a molding mixture into a mold to inject a plurality of dissimilar materials into parts are provided for each molding position of each of the dissimilar materials, and a hopper, a plasticizing cylinder, and an injection molding material for each injection hole In the manufacturing method of a composite layer material using a multi-powder injection molding apparatus each provided with a screw for A plurality of raw material powders, which are different from each other, are mixed homogeneously with each binder, and each raw material powder is composed of 40 to 60 vol% of the corresponding raw material powder and the remaining amount of binder, thereby obtaining a molding mixture for each raw material powder. step; Using the multi-powder injection molding apparatus, injecting a molding mixture constituting a first layer of the obtained molding mixture into the mold through one of the injection holes; By using the multi-powder injection molding apparatus, from the molding mixture constituting the second layer to the molding mixture constituting the last layer, through each of the remaining injection holes, it is sequentially injected into the mold, and is integrally combined from the first layer to the last layer. Forming a composite layer molding; Degreasing the binder from the molding; And sintering the degreased molded product in a sintering furnace. A plurality of nozzles and injection holes for injecting a molding mixture into a mold to inject a plurality of dissimilar materials into parts are provided for each molding position of each of the dissimilar materials, and a hopper, a plasticizing cylinder, and an injection molding material for each injection hole In the manufacturing method of a composite layer material using a multi-powder injection molding apparatus each provided with a screw for A plurality of raw material powders, which are different from each other, are mixed homogeneously with each binder, and each raw material powder is composed of 40 to 60 vol% of the corresponding raw material powder and the remaining amount of binder, thereby obtaining a molding mixture for each raw material powder. step; By using the multi-powder injection molding apparatus, the injection molding mixture forming the first layer from the molding mixture forming the first layer to the molding mixture forming the last layer is simultaneously injected into the mold through the corresponding injection holes, and from the first layer Forming a composite layer molding integrally joined to the last layer; Degreasing the binder from the molding; And sintering the degreased molded product in a sintering furnace. The method according to any one of claims 1 to 3, The raw material powder forming each layer is selected from the group consisting of metal powder, ceramic powder, carbide powder, glass powder, oxide powder, diamond powder or mixtures thereof. The method according to any one of claims 1 to 3, The binder is a method for producing a composite layer material, characterized in that the organic binder. The method of claim 4, wherein The raw material powder and the binder is a method for producing a composite layer material, characterized in that homogeneously mixed for 2 to 3 hours at a temperature condition of 80 ~ 150 ℃. The method of claim 4, wherein The injection method is a method for producing a composite layer material, characterized in that the injection pressure of 1000 ~ 3000 psi in a state where the molding mixture is heated to 150 ~ 500 ℃. delete delete delete The method of claim 4, wherein The degreasing is carried out in a pyrolysis method in a vacuum furnace, the method of producing a composite layer material, characterized in that the heating is carried out at a temperature increase rate of 20 ~ 35 ℃ / hr from 80 ℃ to 600 ℃. The method of claim 4, wherein The sintering is carried out in a reducing hydrogen atmosphere or a nitrogen atmosphere, If the raw material powder is made of metal powder or diamond powder, and mixed powder thereof, the first temperature condition of 500 ~ 1300 ℃, When the raw material powder is composed of ceramic powder or carbide powder, glass powder, oxide powder, and mixed powder thereof, the second temperature condition of 1000 ~ 1500 ℃, When the raw material powder is a mixed powder of the powder of the first temperature condition and the powder of the second temperature condition, the composite layer material is produced for a predetermined time while the third temperature condition of 500 ~ 1300 ℃ is maintained Way. A composite layer material prepared according to the method of any one of claims 1 to 3.

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