JP2560234B2 - Method for producing foil of ceramic whisker and particle reinforced aluminum alloy composite material - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention is silicon carbide ceramics BACKGROUND OF THE INVENTION, titanium carbide, silicon nitride, aluminum nitride, an aluminum alloy containing titanium nitride, the whiskers and particles of titanium diboride as reinforcement, moreover, high-speed superplastic The present invention relates to a method for manufacturing a composite metal material of foil having a thickness of 10 μm to 200 μm, which is manufactured by a rolling method.

[0002]

2. Description of the Related Art Ceramic whiskers or particle reinforced aluminum composite materials have a specific modulus of about 2 that of conventional metal materials.
The strength is twice as high as that of titanium alloy, and it has excellent heat resistance, wear resistance, thermal dimensional stability, and thermal conductivity. Is being applied to structures. Further, it is also expected to be applied to packages of electronic devices such as semiconductors.

In recent years, it has been found that ceramic whiskers and particle-reinforced aluminum composite materials develop superplasticity at a high strain rate of about 0.1 per second. In addition, by the efficient near net shape molding that utilizes this high-speed superplasticity phenomenon, in the aerospace field, etc., the establishment of a technology that can produce a three-dimensional structure with a complicated surface shape and a large surface area with high efficiency has been established. It has become possible.

However, the conventionally developed superplastic ceramic whiskers or particle-reinforced aluminum composite materials have high material prices and manufacturing costs, and there are not many practical examples in the consumer field such as automobiles. In order to put them into practical use, it is necessary to aim to create high value-added products and materials made from these composite materials.

[Problems to be Solved by the Invention]

In recent years, interest in metal foils has increased in various fields including semiconductors. For example, in addition to decorations, many practical applications of semiconductor lead wires, surface heating elements, damping materials, speaker diaphragm seat materials, high-pressure gas valves, spring materials, X-ray extraction window materials, metal foils such as capacitors. Examples have been reported.
Therefore, if a foil of a ceramic whisker or a particle-reinforced aluminum alloy composite material can be manufactured, it can be used in the field of the above-mentioned foil, and its practical application in the consumer field is expected to expand.

[Means for Solving the Problems]

The ceramic whisker (particle) reinforced aluminum alloy composite material has low ductility and fracture toughness, and it is considerably difficult not only to roll it at room temperature but also to process it to 200 μm or less. However, since superplasticity develops at a high strain rate near the solid phase temperature of the aluminum matrix,
It is considered possible to manufacture a foil-like composite material by superplastic rolling. In addition, conventionally, metal such as aluminum and stainless steel has a multi-stage rolling mill with 4 to 6 or more rolls at room temperature.
A foil having a thickness of 00 μm or less is produced. Therefore, the inventors considered manufacturing a foil by a method of stacking a composite material in multiple stages in high-speed superplastic rolling, which is a combination of hot extrusion and hot rolling, for which a patent is being applied.

In order to enable superplastic rolling, the crystal grain size of the matrix of the composite material is as fine as about 3 μm, and sliding deformation occurs at the interface between the reinforcing material and the aluminum matrix at the superplasticity temperature. That is.
The composite material to produce a microstructure capable of superplastic expression fever
Extrusion, rolling, or a combination of these
It is to perform sexual processing . That is, the aluminum matrix
Cus crystallizes at high temperature and plastic deformation due to hot plastic working
Fine new crystal grains starting from grain boundaries as the grains are crushed
Is formed. Aluminum alone does not work at high temperatures.
New crystals grow and the grain size increases, but
In this case, since the ceramics exist stably,
Growth is suppressed. Volume content of ceramics is 10%
In the above case, the space between the reinforcing materials will be about 3 μm or less.
With fine particles of 3 μm or less in the matrix of the composite material.
Crystal grains will be formed. In this case, in order to hot-roll the composite material with a cold rolling mill, the composite material is sandwiched between a stainless pipe and a plate, heated to a temperature at which superplasticity is developed, and rolled through stainless steel in contact with a roll. To maintain the temperature of the composite material.

In order to produce a composite material foil, it is necessary to carry out rolling at a high strain rate. To perform rolling at a high strain rate, a diameter of 100 mm rotating at 10 m / min
If the rolling strain amount is reduced to 0.1 or less using the roll No. 1, the composite material can be rolled at a strain rate of about 0.1 per second. As shown in FIG. 1, the composite material rolled to about 1 mm or less is sandwiched between stainless steel plates, and the stacked products are further packed in a stainless steel tube, and this is packed at a temperature (450 ° C. to 630 ° C.) at which superplasticity is exhibited. During heating), the material is rolled and heated to a thickness of 200 μm or less by repeating rolling and heating. At this time, the rolling amount for each pass is 0.1 or less. Two-high rolling mill, or 4
It is possible to produce foil by using a multi-roll mill.

EXAMPLES Examples of the present invention will be described below.

Example 1 A 6061 aluminum alloy powder having an average particle size of 45 μm or less contained titanium carbide TiC particles in a volume content of 0.
15 and mixed to prepare a rod-shaped TiC particle-reinforced 6061 aluminum composite material having a diameter of 40 mm by powder metallurgy. On the other hand, extrusion processing is performed at 500 ° C and an extrusion ratio of 44 to form a 6 mm wire rod.
It is wrapped in a stainless steel plate and tube, heated to a temperature of 560 ° C., and rolled many times with a small rolling reduction with a strain amount of about 0.1 or less. By repeating this heating-rolling, a superplastic plate-like composite material having a thickness of about 1 mm is produced. After that, a lubricant is applied to the plate-shaped superplastic composite material having a length of about 40 mm, and two sheets are sandwiched between two stainless steel plates having a length of 130 mm to form a laminated rolling material. These are diameter 58mm thickness 1.5mm length 130m
m-stainless steel tube, repeated rolling and heating at 560 ° C. with a strain amount of 0.1 or less, and performing rolling until the thickness becomes 200 μm or less.
A composite material with a thickness of μm was produced.

Example 2 As in Example 1, 2014 with an average particle size of 45 μm or less
Aluminum alloy powder and TiC particles were mixed so that the volume content was 0.15, and the composite material produced by the powder metallurgy method was extruded and then rolled to obtain a composite material having a thickness of 2
The heating-rolling is repeated until it becomes 00 μm or less. As a result, 150 μm and 200 μm foils could be manufactured.

Example 3 As in Examples 1 and 2, 6 having an average particle size of 45 μm or less was used.
061 aluminum alloy powder and Si3N4 whiskers
Powder metallurgy by mixing to a volume content of 0.20
After extruding the composite material made in
Heating-rolling is repeated until the material thickness is 200 μm or less.
Return. As a result, 200 μm foil can be produced.
Came.

[0012]

EFFECT OF THE INVENTION 150-2 produced by the method described above
Tensile tests were conducted from room temperature to 400 ° C. to investigate the mechanical properties of foil-like composite materials with a thickness of 00 μm or less. FIG. 2 shows the tensile strength of the foils of TiC / 6061 and TiC / 2014 aluminum alloy composite material. TiC / 201
It was found that the 4Al composite material had a tensile strength of 440 PMa at room temperature and the TiC / 6061Al composite material had a tensile strength of 300 MPa. TiC / 2014
The Al composite material has strength not inferior to that of the stainless steel foil and can be practically used.

[0013] Also, FIG. 3 shows the superplastic properties of TiC / 2014Al composites. The test temperature is 545 ° C. Ti
The C / 2014 Al composite was found to produce about 200% total elongation at a strain rate of 0.5 S ^-1 . This indicates that the foil composite material can be formed into a complicated shape.

Further, FIG. 4 shows Si _Three N ₄ / 6061Al compound
The superplastic property of the composite material is shown. Test temperature is composite material thickness
Is 0.7 mm and 0.9 mm, the temperature is 580 ° C and the thickness is
Is 600 ° C. for a foil having a thickness of 0.2 mm. For foil
In addition, it shows a total elongation of 150%, making superplastic forming possible.
It turns out that it is Noh.

[0015] By working in a foil, it is expected that use of this composite material parts such as semiconductor based packages like or micromachines. It is also possible to fabricate a long-fiber composite material in which the matrix exhibits superplasticity by stacking a foil-shaped composite material with ceramic long fibers and pressing with hot pressing, which is complicated by superplastic forming for a long-fiber reinforced composite material. It can be expected to manufacture shaped long fiber composite material aircraft parts and structures.

[Brief description of drawings]

FIG. 1 shows a thin plate-like composite material of about 1 mm or less about 1.5 mm.
The following shows a material for rolling, which is sandwiched between two stainless steel plates, and several stainless steel tubes are stacked.

FIG. 2 shows the tensile strength of TiC / 6061 and TiC / 2014Al composites.

FIG. 3 shows the relationship between total elongation and strain rate at 545 ° C. of TiC / 2014Al composite material.

FIG. 4 SiC / 6061Al composite material at 580 ° C and 6
The relationship between the total elongation at 00 ° C and the strain rate is shown.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area C22F 1/04 C22F 1/04 A

Claims (2)

(57) [Claims] 1. A ceramic carbide (silicon carbide, titanium carbide) or nitride (silicon nitride, having a grain size of 45 μm or less).
Aluminum nitride, titanium nitride), borides (titanium boride) at least one or more and a particle size 45μm or less of the 2000 series of the 6000 series, 5000 series, 7000 series and 8000 series one type and a ceramic of the aluminum alloy powder Of powder mixed uniformly so as to have a volume content of 0.10 to 0.30 was pressure-sintered in a vacuum hot press to produce a composite material at a temperature of 450 ° C to 6 ° C.
Extrusion is applied at a temperature of 00 ° C. with an extrusion ratio of 10 or more. This composite material billet is sandwiched between a stainless tube and a plate and heated to a temperature of 450 ° C. to 600 ° C., and the strain amount per pass is 0.1 or less. The rolling process and the heating and holding at the rolling temperature for 5 minutes or more are repeated to form a plate-shaped composite material of about 1 mm.
A method for producing a foil of a composite material, in which several sheets sandwiched one by one are stacked, rolling and heating are repeated under the same conditions as described above, and processed into a thickness of 200 μm or less. 2. A silicon carbide (SiC) whisker, a silicon nitride (Si ₃ N ₄ ) whisker preform and 2000
System, 6000 system, 5000 system, 7000 system and 8000 system
A foil of a ceramic whisker reinforced aluminum alloy composite material (composite material having a thickness of 200 μm or less) obtained by subjecting a composite material produced by a molten metal forging method using a system aluminum alloy to the extrusion and rolling under the same conditions as in claim 1. of
Production method.