JPS59177336A - Production of fiber reinforced composite metallic material - Google Patents

Abstract

PURPOSE:To obtain a fiber reinforced composite metallic material of a desired shape in which reinforcing fibers are isotropically disposed by housing a fiber assemblage in a compacted state into a case formed of a high melting material and bringing a molten base metal into contact therewith to penetrate said metal into the fiber aggregate then solidifying the material. CONSTITUTION:Carbon fibers 51, etc. are uniformly dispersed and disposed in a metallic mold 1 and an org. binder 52 is poured thereon. A top punch 11 is lowered to compress the mixture and the mixture is hardened by heating to form a compacted molding. such molding is housed in a case formed of a high melting material and is heated to remove the binder 52, by which the fiber assemblage is obtd. The fiber assemblage in the state of being housed in the case is put into the mold 1 and after the assemblage is preheated, the melt of a base metal such as an Al alloy or the like is charged into the mold. The punch 11 is lowered to press the mixture and thereafter the mold 1 is cooled to solidify the molten metal. The fiber reinforced composite metallic material having a high fiber content is obtd. by the above-mentioned method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing fiber reinforced metal composites (rRM).

FRM is a composite material in which a large number of fibers as a dispersion material are embedded in a metal base material. This is made by reinforcing the strength, rigidity, heat resistance, and other characteristics of raw metal with fibers, and its applications include sliding parts such as pump vanes, and automobile parts that require heat resistance. wide.

Conventionally, FRMs have been manufactured using, for example, the diffusion bonding method. This is made by slowly bonding raw metal and Ili fibers of the same phase by hot pressing and forming them. That is, the fibers are sandwiched between metal foils.
~Press or f! Ii#ff was manufactured by laminating prepreg sheets coated with metal on the surface and pressing them together, or by sprinkling powdered metal on fibers and pressing them. In addition, as another method, after contacting and permeating molten base metal into the woven shoulder 1,
A method of solidifying this in a cold stage was also used.

But 1. The conventional FRM manufacturing method had the following drawbacks.

First, it has been difficult to uniformly disperse the weave in the base metal. For example, in the molten base metal, the fiber shoulder 1 was mixed with 11 parts (if it was avoided to solidify after being smelted, due to the difference in ratio between the metal and the fiber shoulder 1, there were unevenly distributed over-solidified shoulders C). . For this reason, it was difficult to obtain an FRM with good characteristics.

Second, it is difficult to avoid arranging the weave in the same direction in the base metal. For example, when a gold layer foil or a prepreg sheet is used in the diffusion bonding method J3, the strengthening direction of A is two-dimensional. Maiko? 5) Stirring to uniformly align the fibers in the unfinished metal.
The resistance is large and this is a problem. JI:, in molten metal (,
Even if the fiber shoulders f are divided biisotropically, the weave will be unevenly distributed during the coagulation process.

F RM f! having this lζ isotropic characteristic. :Ii
It was difficult.

Thirdly, it is difficult to adjust the fiber rows in FRM and to detect high content FRM.

In general, various properties of FRM depend on the fiber content. Moreover, the strength is improved as the fiber content increases. Therefore, if it is desired to obtain an FRM having desired characteristics depending on the application, the fiber content may be set accordingly. However, in the conventional manufacturing method, the setting range of fiber content is naturally limited, and it is also difficult to remove one with a high fiber content. For example, when using Prepreg Sea 1~, the metal skewer that covers the fibers is limited to some extent depending on the thickness of the fibers. Furthermore, when fibers are to be dispersed in the molten metal, the use of the fibers that can be introduced into the molten metal is limited by the volumetric appeal of the molten metal.

Fourth, it is difficult to obtain an FRM of any shape by the manufacturing method.
ll C-There was.

Honkomei is the conventional +! The purpose is to overcome the following drawbacks of the A construction method.

That is, in the present invention, molten metal is brought into contact with and penetrated into the fiber aggregate. , in the method for manufacturing a fiber eaves 1 reinforced metal composite material, in which the base metal is solidified, the fiber aggregate is made of fibers M that are consolidated in a case with a melting point higher than that of the base metal; This is a method for producing a fiber-reinforced metal composite splint, which is characterized by obtaining -C by storing the fibers in the sea urchin.

A fiber aggregate is a bundle of fibers formed into a predetermined shape. Here, the predetermined shape is the desired FRI'tI
The shape is approximately equal to the shape of +. For the woven shoulder 1, common ftff and short fibers of various types of woven fabrics such as carbon fiber, glass fiber, boron fiber, silicon carbide fiber, aramid fiber, etc. can be used. The predetermined shape of the fiber aggregate is
The fiber aggregate is held by a case that houses it. That is, the fibers are housed in a 17-space of a predetermined shape so as to be in a compacted state to obtain a navy blue aggregate II. The compacted state can be obtained by compressing the fibers after storing them in a case. In addition, the case was initially of a simple shape, and after storing the woven shoulder 1, it was molded and pressurized in a mold to form a consolidated body, or a plate-shaped case was press-formed and a plate-shaped consolidated body with a constant shape was formed. You can also take your body. The material 1 of the case must be a material 1'31 with a melting point higher than that of the base metal. This is because the fiber aggregate is brought into contact with the molten base metal while being housed in the case.

41 fibers are stored in the case. In this case, the fibers may be dispersed and stored in an organic binder. Dispersing the fibers in a liquid organic binder facilitates storage in a case and provides uniform and isodirectional fiber distribution. The fibers are dispersed in the organic binder by, for example, uniformly mixing the liquid organic binder and the fibers using a stirring device, a kneading device, or the like. In order to facilitate dispersion, it is necessary that the organic binder and fibers have good wettability. Also,
) In order to knead uniformly, the viscosity of the binder used during mixing should not be too high. For this reason, it is important to dissolve the organic binder in a solvent such as aretone or water. In addition, when using an organic binder, the fibers are dispersed V
After that, it may be solidified into a predetermined shape and stored in a case. Conditions such as temperature required for solidification of organic binder
1 varies depending on the type of binder. For example, when polyvinyl alcohol is used, the temperature is about 2
Just heat it up for a while. However, some binders can be removed by thermal decomposition after being stored in the case. Conditions such as thermal decomposition temperature vary depending on the type of organic binder. For example, when polyvinyl alcohol is used, the The case is heated for a period of time.In order to allow the gas generated to escape, there are many small air circulation holes in the case.

Polyvinyl alcohol (PVA) as an organic binder
, epoxy resin, methyllerulose, polypropylene, etc. can be used.

17- The collection of fibers housed in the space is pressurized as described above and formed into a dense body of a predetermined shape. Depending on the degree of the applied JT force in this addition process, the fiber resistance of the FRM, which is the final product, can be set.

For example, if you want to obtain FRM with a high fiber content, pressurize with high pressure 1. This will increase the amount of lint in the compacted body, which will also increase the lint content of the final product, FRM.

On the other hand, if it is desired to obtain FRM with a low fiber content, a relatively low pressure of 1111 may be used.

The molten base metal is brought into contact with and infiltrated into the fiber aggregate having a predetermined shape thus obtained.

The base metal is the main metal in which the dispersion material, such as the carbon string, is buried. Of metal! The li type can be selected depending on the use of the FRM. For example, aluminum, aluminum alloy, magnesium, magnetic screw rim alloy, copper, copper alloy, etc. can be used. By using aluminum rims and aluminum alloys, you can obtain lightweight and strong composite materials. The base metal is melted before it comes into contact with and permeates the fiber aggregate. That is, after the base metal is heated and melted separately from the fiber aggregate, it is brought into contact with and infiltrated into the fiber aggregate as described below. By exploring this method, it is possible to suppress the reaction between the two by reducing the amount of time that both are exposed to high temperature together than before. Melting W! The temperature is preferably 10 to 20'C higher than the melting point of the base metal.

The reason is that the metal soaks into the fiber; J: C
1,1 It is necessary to maintain the molten a state = On the other hand, after infiltration, it is necessary to cool down and avoid solidification.

The molten base metal is brought into contact with and impregnated into the fiber aggregate by a method such as pouring the base metal onto the fiber aggregate. According to this method, the Lu material can easily penetrate into the Lu material gold metal fiber aggregate due to the capillarity of the fiber aggregate. In addition, the heat capacity increases due to the excess heat capacity of the base metal because it can come into contact with the strand bundle. .Furthermore, it is possible to increase the ratio of fiber aggregates in the FRN'l than before.
It is desirable that the aggregate be heated in advance to a temperature close to the melting point of the metal. The reason is that before the 104A metal comes into contact with the t = I + aggregate and penetrates k 1G, m
This is to prevent the string assembly from absorbing heat and solidifying, resulting in insufficient penetration. In addition, the fiber aggregate is preferably re-evacuated beforehand to J3 < in order to facilitate the penetration of the base metal into the fiber aggregate. Alternatively, in order to promote the permeation, pressure may be applied to the fiber aggregate and the base metal after they come into contact with each other. The pressurizing means may be gas pressurization or mechanical means such as a plunger.
: Pressure may be applied.

After contacting and infiltrating the molten base metal into the fiber aggregate, it is immediately cooled and stirred for one hour to solidify. After contact, the time required for solidification is preferably within 3 minutes.

In other words, within 3 minutes, the reaction between the fiber aggregate and the base metal is relatively small, and a high-strength FRM can be obtained. Note that the shorter the contact between the fiber and the molten metal, the better.

Cooling may be performed, for example, by disposing a cold N1 pipe around a container housing the fiber aggregate and base metal, and flowing a coolant into the cooling pipe. Alternatively, a water girder may be disposed at the bottom of the storage container, and the storage container may be crushed (plunged) into the water in the water tank to cool it. The FRM is manufactured in the above manner.

The manufacturing method for Mokukomei is superior to conventional manufacturing methods in the following points.

First, isotropic properties such as strength <@ F RM
can be done. This is because the fibers can be uniformly and uniformly dispersed in the base metal.

Second, since fibers are compacted to obtain a compacted body, the content of fiber shoulders can be set arbitrarily, and FRM with a higher fiber content than before can be produced.

Thirdly, it is possible to manufacture an FRM having a shape depending on the intended use.

The present invention will be described in detail below.

FIRST EXAMPLE FIG. 1 is a schematic cross-sectional view of the pressure molding apparatus used in this example, and FIG. 2 is a perspective view of a case containing the compacted body of this example.

14 The pressure molding apparatus shown in FIG. 7 consists of a mold 1 and a frame 2. The mold 1 consists of a main body 10 and an upper punch 1 installed inside the main body 10 so as to be slidable downward. Money ha! The internal shape of 1 is equal to the external shape of the manufactured FRM. A heating means gear 101 is installed in the main body 10. The lower bump 12 is provided with a large number of small diameter holes for draining excess moisture in the compacted compact, and a mesh-like wire gauze is installed on the surface of the lower bun f12 facing the upper bunch 11. The frame body 2 includes the main body 10 of the metal 1, a stand 23 for fixing the lower bunch 12, a cross head 21 for fixing the upper punch 11, and a support part 2 for supporting these.
It consists of 2. The crosshead 21 is movable up and down.

The present invention was carried out using the pressure molding apparatus having such a configuration according to the following procedure.

(1) Carbon fibers M+ 51 having an average fiber length of 3+++a+ were arranged so as to be uniformly dispersed inside the mold 1.

(2) An aqueous polygonylalnylene solution 52 (approximately 40%), which is an organic binder, was poured into the mold 1 to crush the carbon fiber shoulders 151.

(3) The upper bunch 11 was lowered to compress the mixture of the carbon binding string 51 and the polyvinyl alcohol aqueous solution 52.

(4) The inside of the mold 1 is heated to 200°C for about 2 hours to harden the polyvinyl alcohol 52, and the compacted molded body 50
I was disappointed.

(5j) The compacted compact 50 is shown in FIG.
It was stored in. The inner shape of this case 6 is manufactured FRM.
It has the same external shape, and there are many air circulation holes 61 on its side to prevent the sword from escaping! l has been established ().

(6) The compacted compact 50 housed in the case 6 is heated to 450°C for about 1 hour under air circulation to make polygonyl aluminum τI-
The carbon fiber shoulder 1 aggregate 5 was removed by 1'J
Ta.

(7) Store the carbon fiber collection material 5 described in 1- in the case 6 and store it inside the mold 1, and make the inside of the mold 1 by /10-
The carbon fiber aggregate 5 was preheated by heating to /130°C.

(8> After pouring the molten aluminum alloy into the inside of the mold 1, lower the upper punch 11.
It was pressurized at a pressure of cJ12.

(9) After the pressurization was started, the mold 1 was quickly cooled down by a means not shown, and the aluminum alloy was solidified rapidly.] An FRM was obtained.

Second Embodiment The second embodiment is substantially the same as the first embodiment. The second embodiment differs from the first embodiment in the step of contacting and infiltrating the carbon fiber aggregate 5 with molten metal.

The second example was carried out using the following procedure.

<1) Same as the first embodiment ((1)-(6) of the first embodiment)
) to produce a carbon fiber aggregate 5 having a predetermined shape. Here, the case 6 housing the carbon fiber aggregate 5 has a thickness of 0.
．． The case 6 is made of an iron plate with a thickness of 5+nm or more, and a hand is fixed to the case 6.

(2) The carbon fiber aggregate 5 was stored in the impregnating container 7 while being stored in the case 6, and this was stored in the A-Tocray 1 apparatus 8 as shown in FIG.

FIG. 3 is a schematic cross-sectional view of O 1 to crepe device 8.

, the A-to-crepe charger 8 consists of a container storage section 81 and a gas supply section 82.

The container storage section 81 stores pressure vessels 8 such as pressure vessels ε) 1o, etc.
10 and a heater 812 surrounding the pressure vessel 8 .
It consists of a bolt-shaped stopper 814 that tightly covers the upper opening of 10.

The waste supply section ε32 has a gas introduction pipe 821 that passes through the upper part of the pressure vessel 810 and has its tip directed toward the inside of the pressure vessel 810.
, a gas 11 outlet pipe 823, and valves 8211 and 8231 attached to the middle of each pipe.

Note that a gas cylinder (not shown) is connected to the other end of the gas introduction pipe 821. Also, a 4Rn2 pump (not shown), G11, can be connected to the other end of the gas discharge pipe.

(3) While supplying nitrogen gas from the gas introduction pipe 821 to the inside of the pressure vessel 810 with the valve 8211 closed, the inside of the pressure vessel 810 is heated to approximately 550°C by the heater 812.
heated to.

(4) The plug 814 was removed, and the aluminum alloy at 590° C., which was the base metal J3 that had been previously melted, was poured into the impregnation container 7.

(5) Close valve 8231, listen to valve 8211,
Nitrogen gas is introduced into the pressure vessel 810 at a gas pressure of 50 ko/
cm 2 or more and carbon fiber aggregate 5 in the case
infiltrated with aluminum alloy.

(7) Cooling water was flowed through the cooling pipe surrounding the impregnation container 7 to solidify the aluminum l\ alloy to obtain an FRM.

Both the first example and the second example have a fiber content of 10 to 60 vo.
It is possible to manufacture FRM of 1%, and therefore, it is possible to manufacture FRM having desired characteristics tII: (strength, coefficient of thermal expansion) depending on the use of the FRM. In addition, the fiber content in the case of the conventional manufacturing method is 10~/'IOv.

It is 1%I￥I-ro.

Further, the bending strength in any direction and the coefficient of thermal expansion of the FRM manufactured by the method of the first example were as shown in the table shown at the end.

To summarize, the present invention provides a method for producing a fiber-reinforced metal composite material in which a molten base metal is brought into contact with a woven IIt aggregate, infiltrated therein, and then the base metal is solidified.
A method for producing a 413 llff reinforced metal composite material, characterized in that the A fiber aggregate is obtained by housing the fibers in a compacted state in a case of forest material having a higher melting point than the base metal. .

According to the manufacturing method of the present invention, the fibers 11 in the FRM can be oriented in the same direction and uniformly. In addition, it is possible to widen the setting range of the fiber shoulder rate and increase the fiber content. Also, FF-shaped F R
It is possible to manufacture M.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of the pressure forming device, Figure 2 (2 machines HM
Perspective view of the case housing the three combinations, Figure 3 t, 'A-1
- A schematic cross-sectional view of the crepe device.

Claims (1)

[Scope of Claims] (1) A method for producing a fiber-reinforced metal composite material, in which a molten fl abrasive is brought into contact with and permeated into the fiber aggregate, and then the base metal is solidified, wherein the fiber aggregate comprises: The Ra cloth has a higher melting point than the material metal mentioned above.
A method for manufacturing a fiber-reinforced metal composite material, characterized in that the material is stored in a compressed state in a JJ monthly case. (2> +W+Record miscellaneous aggregate is produced by storing 4) 11 tit in a case, compressing it into a certain shape, and manufacturing it according to claim 1 Jfi. Method. (3) The manufacturing method according to claim 1, wherein when storing and covering the fibers in the case, the fibers are dispersed in a liquid organic binder and then stored, and after (a), the binder is thermally decomposed. (/I) The manufacturing method according to claim 1 (d), wherein the fibers are short navy blue fibers. (5) The manufacturing method according to claim 1, wherein the weave is a navy blue weave. (6) The above-mentioned right number 1 is polyvinyl alcohol, [
11. The method according to claim 1, which is one of boxy resin, methylcellulose, and polypropylene.