JPS58167160A - Manufacture of fiber reinforced metallic compound material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a fiber-reinforced metal composite material, and in particular to a method for producing a fiber-reinforced metal composite material by combining preliminary sintering and sintering.

Composite materials, such as FRP (fiber-reinforced plastic), are widely used in many fields today because of their excellent properties (high strength, light weight, etc.). However, in the case of FRP, since its matrix is plastic, it does not have sufficient flame resistance, weather resistance, corrosion resistance, etc., and its service temperature limit is 150 to 200.
It is said that up to 1:.

In order to solve these problems, so-called FRM (fiber-reinforced metal) materials, which have a composite matrix of metal, have already been proposed. It is expected to be in great demand as a structural material or as a high-strength mechanical part that needs to be lightweight.

Here, as a manufacturing method of fiber-reinforced metal material, 1) Infiltration Process t
l) Diffusion bonding method
Process), iM) Powder metallurgy method (P
metallurgy method)
, and lv) unidirectional coagulation method (Unidireeti
onal 5olidificationProces
Of these, the diffusion bonding method, which applies static pressure at high temperature, is currently said to be the most superior method. This diffusion bonding method further includes a laminated press method in which the fiber material and the matrix material are laminated and press-molded. The method can be divided into a matrix coating press method in which fibers coated with a TRIX material are press-molded, and a foil-sheet method in which matrix foils and fibers are alternately stacked and press-molded.

However, in such conventional diffusion bonding methods, the compositing process is performed at high temperatures (generally,
ff) carried out at a temperature near the melting point of the lithics material),
This has the drawback of damaging and deteriorating the fibers and causing reactions between the fibers and the matrix metal, resulting in significant embrittlement of the material. Since the manufacturing process (structure and structure) occupies most of the manufacturing process, there are disadvantages such as low productivity and uneven quality.

The powder metallurgy method described above is a very efficient and highly productive method in which metal powder and fibers are blended, mixed, and sintered, but due to mixing constraints, only short fibers can be used. In addition, it is difficult to uniformly distribute the powder in the IJ lax body due to the powder mixing operation, and the quality of the resulting product inevitably becomes uneven.

Thus, an object of the present invention is to provide a method for producing a fiber-reinforced composite material with high productivity and uniform quality of the resulting composite material.

Therefore, the present inventors have contemplated the use of long fibers, thereby preventing damage to the fibers during the compositing process, and increasing the composite bonding strength compared to the foil-sheet method described above. The present invention was completed as a result of intensive research in order to improve the quality of the product, and its gist is a process of blending thermoplastic resin powder with aluminum, titanium, or alloy powder to form a metal-resin mixture. , the metal-
A step of mixing and granulating the resin mixture to form metal-resin pellets, a step of extruding the metal-resin pellets under heating to form a sheet, and pre-sintering the obtained sheet to form a porous metal sheet. a step of supplying previously prepared inorganic fibers between a plurality of the porous metal sheets; a step of cold-pressing the plurality of porous metal sheets with the inorganic fibers interposed therebetween to form a composite of at least three layers; This is a method for producing a fiber-reinforced metal composite material, which comprises a step of forming a molded body and a step of sintering and integrating the composite molded body.

The ff)9x material used in the present invention is aluminum, titanium, or an alloy of these metals, and its type is not limited by percentage, but it is preferably one that has been previously reduced and has a particle size of about 100 μm or less. The fiber material is not particularly limited as long as it exhibits wettability with the metal material under the conditions of the present invention and reacts with the metal material to become brittle, but Sin and B fibers are preferred.

Although continuous long fibers can be used in the present invention, so-called short fibers may be used if necessary.

FIG. 1 of the accompanying drawings shows a 70-step method of the present invention, in which in step 1 the metal powder and thermoplastic resin are mixed together.

The thermoplastic resin is blended into the metal powder as a binder by pelletizing the powder and forming it into a sheet.
This is particularly effective when making the method according to the present invention continuous. The thermoplastic resin is not limited to any time as long as it functions as a binder during granulation and evaporates and disappears when heated during pre-sintering of the 4ft series, but polyethylene and polypropylene powder (particle size of 100 μm or less) is used for ease of handling. ) is preferably used.

The blending ratio (weight) to the metal powder is 10% or less.

The obtained metal-resin temperature and hardware are sent to step 2, where they are subjected to kneading and granulation treatment preferably under heating at 200° C. or lower. The pellet particle size is preferably 1 to 3 MalJE. Such granulation is carried out in order to prevent segregation of gold ellipses during extrusion molding, and may be carried out for about 1 hour, for example, by appropriate rapid granulation, which is well known in the art.

The metal-4II fat pellet thus obtained is then subjected to extrusion molding in step 3, preliminary sintering in step 4, feeding of fibers in step 5, cold rolling in step 6, and sintering in step 7. It is combined with fibers through a series of steps. Process 5
The fibers supplied in step 8 can be those prepared in advance in a separate step 8.

That is, in step 3, when polyethylene or polypropylene resin is used, the metal-resin pellet is extruded by heating it again to about 200 DEG C. if necessary, and then rapidly cooled and formed into a sheet. In step 4 of performing preliminary sintering, this sheet-like molded body is vacuum-operated and subjected to degreasing and preliminary sintering in an inert gas atmosphere. The temperature at this time is preferably 500°C or less for aluminum or its alloy, and preferably 1100°C or less for titanium or its alloy, and this is to prevent the reaction between the IJ lux group and the fibers. . As a result, the thermoplastic resin content is removed and a partially sintered porous metal sheet of aluminum, titanium or an alloy is obtained.

At least two or more pre-sintered porous metal sheets obtained in this way are prepared, and inorganic fibers prepared separately in step 8, preferably several tens of microns in diameter, are placed between each of these porous metal sheets in step 5. Fibers such as SiC and B are sandwiched, that is, inorganic fibers are interposed between each sheet, and the resulting composite molded body is cold rolled in the next step 6 to mechanically bond the materials. It was found that because the metal matrix is a porous pre-sintered body, the mechanical entanglement of its porous surfaces is promoted, and the mechanical bond between them becomes even stronger. The cold rolling at this time should be carried out at a reduction rate that eliminates voids; if the rolling is too strong, there is a risk that the fibers will break. In the case of SiC and B#I fibers, the fiber supply ratio at this time may be 10 to 80% by volume of the entire composite material, and is generally 40 to 6 degrees.

Kai-C Yu. 66yoyu, 8yooyu, 5works 7yo
After sintering, forging and other processing may be performed in the same manner as in the conventional example.

In a preferred embodiment of the present invention, by making these series of steps continuous, the productivity of the manufacturing method according to the present invention is significantly increased. That is, extrusion molding of metal-resin pellets is performed using a hopper type extruder, and a belt conveyor (
A continuous sheet continuously extruded onto a sheet (preferably made of stainless steel) is conveyed on a conveyor and supplied to a continuous heating furnace, where it is continuously degreased and pre-sintered. During this preliminary sintering, the thermoplastic resin is evaporated and removed, and a porous continuous metal sheet is obtained. Two or more porous continuous metal sheets obtained in this way are prepared, and continuous inorganic fibers prepared in advance are prepared. By feeding between each sheet, a composite with a uniform distribution of fibrous material is obtained in succession, which is then compressed by cold crimping at least three
A composite molded body of layers is formed. These are then sintered and integrated.

Thus, preferred embodiments of the present invention include a step of blending thermoplastic resin powder with powder of aluminum, titanium, or an alloy thereof to form a metal-resin mixture, and a step of kneading and granulating the metal-resin mixture to form a metal-resin mixture. A step of forming resin 4lets, a step of continuously extruding the metal-resin pellet under heating to form a continuous sheet, and continuously pre-sintering the obtained continuous sheet to form a porous continuous metal sheet. a step of continuously supplying pre-adjusted inorganic long-edge fibers between the plurality of porous continuous metal sheets; a step of cold-pressing the plurality of porous continuous metal sheets with the inorganic fibers interposed therebetween; This is a continuous method for manufacturing a fiber-reinforced wire mesh composite material, which comprises a step of forming a composite molded body of at least three layers, and a step of successively sintering and integrating the composite molded body.

Note that even when short twill fibers are used as the inorganic fibers, continuity can be achieved by uniformly and continuously supplying the fibers to the above-mentioned porous continuous metal sheet.

Other specific heating conditions, cross-wire conditions, and further sintering conditions in the present invention can be appropriately set by those skilled in the art depending on each material used.

The present invention will now be described in more detail based on a preferred embodiment shown in FIG. FIG. 2 schematically shows an apparatus for carrying out the method of the invention, in which a fiber-reinforced composite material is produced continuously in the form of 7-pieces in the illustrated example.

In this example, titanium powder with a particle size of 100 μm or less was used as the metal powder, and a metal-resin mixture was used in which 9 cm of polypropylene resin powder was blended by weight, while continuous SiC* fibers with a diameter of 20 μm were used as the blended inorganic fibers. First, the above metal-resin mixture is granulated with a sigma type kneader to a particle size of 1 to 3 mm, and then the mixture is composited at a composite volume ratio of 40q6. The mold is charged into the mold extrusion molding machine 21. Extrusion graph/
The gold maple-resin mixture 24 which is continuously extruded into a sheet shape by the gloss 22 onto the stainless steel Peltoco/Pair 23 is carried out in the direction of the arrow in the figure, and cooled by blast from the cooling device 25 (indicated by the arrow in the figure). ), the thermoplastic resin melted during extrusion molding solidifies into a continuous sheet that exhibits self-retaining properties. The continuous sheet leaving the belt conopiae is then sent to a continuous heating furnace 26, preferably a two-hole electric furnace.

The continuous heating furnace 26 is maintained in a vacuum and inert gas atmosphere, and as the continuous sheet is moved through the heating furnace by a roller conveyor 27, it undergoes degreasing, heating evaporation of the thermoplastic resin, and metal crosslinking. Preliminary sintering of the powders takes place continuously.

Evaporation of the thermoplastic resin begins at approximately 300-400°C, and the pre-sintering temperature at this time would be approximately 1100°C.If aluminum is used as the powder metal, the temperature will be approximately 500°C.
It is ℃. Residence time in the furnace is 10 to 30 minutes. The pre-sintered body 28 when exiting the heating furnace after the pre-sintering has a thickness of approximately 0.5 to IM.

On the other hand, the SiC continuous fiber bundle is continuously supplied from the roll 29. In the illustrated example, lI! of a complex of 31i! ! This shows an example of the construction, and the preliminary sintered body 28 is also seen from the right side of the drawing in the same manner as described above.

It is sent continuously (in the illustrated example, the explanation is complicated:
), the continuous string bundle is applied to the joint surface of both preliminary sintered bodies 28 (preferably the surface opposite to the surface that contacts the belt conveyor during extrusion molding, and that surface is particularly porous). 30 is given +11 and is caught. Such bonding of porous surfaces makes the mechanical bond between them even stronger.

As described above, since a continuous long fiber bundle is used as the inorganic fiber, the distribution can be easily made uniform. , 40 inches to form a dense structure with no internal pores.

The width at this time is 200 proverbs.

In the case of the present invention, following the supply of the braided cord bundle 30, the roll 3
Since the cold rolling according to No. 1 is performed, excessive tension is not applied to the string bundle 30, and breakage of the string bundle due to this can be prevented. This cold-rolled composite body 32 passes through rolls 33 and then passes through a continuous heating sintering furnace (under vacuum or in an inert gas atmosphere).
(not shown). As mentioned above, the sintering temperature at this time is approximately 1100°C for titanium and 5°C for aluminum.
00°C, and at this temperature no reaction between the inorganic fibers and the metal matrix occurs, and therefore the problem of material weakening due to K does not occur.

Furthermore, according to the present invention, fibers are blended into the preliminary sintered body, and since the preliminary sintered bodies are mechanically bonded sufficiently during the cold rolling, the final The bonding strength between the materials found in the composite is also further improved.

[Brief explanation of drawings]

FIG. 1 shows a flow sheet of the method according to the invention, and FIG.
The figure is a schematic illustration of an apparatus for carrying out the method according to the invention. 1. Step of blending raw materials, 2. Step of pelletizing, 3. Step of extrusion molding, 4. Step of pre-sintering, 5. Step of supplying fibers, 6.・Cold rolling] step, 7... Sintering step, 8... Preparing fiber.

Claims (1)

[Claims] A process of blending thermoplastic laryngeal powder with powder of aluminum, titanium or its alloy to form a metal-resin mixture, a process of mixing and granulating the metal-resin mixture to form metal-resin pellets, and a process of forming the metal-resin pellet. Beren) 1- Step of extrusion molding under heating to form a sheet, pre-sintering of the obtained sheet to form a porous metal sheet, and inserting pre-prepared inorganic fibers between the plurality of porous metal sheets. supply process,
A fiber-reinforced method comprising a step of cold-pressing the plurality of porous metal sheets with the inorganic fibers interposed therebetween to form a composite molded body of at least three layers, and a step of sintering and integrating the cough composite molded body. Manufacturing method for metal composite materials.