JP2002283041A - Laminated structural member and its producing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a laminated structural member excellent in reliability without causing peeling off and crack at a joined part in a boundary layer, even when repeatedly heated and cooled. SOLUTION: A mold is used in which an overflow hole is arranged at a position where a lower layer having a desired thickness is obtained, and a sheet-like metallic net is set in advance near a position where the boundary layer is formed between the lower layer and an upper layer. After molten metal for a lower layer member is poured into the mold, molten metal for upper layer member is poured and cooled before the lower layer is fully solidified and thus, the laminated layer structural member is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated structural member including a layer made of a metal-ceramic composite material and a method for producing the same, and more particularly, to a laminated structure in which the layers are not peeled off even after repeated heating and cooling. The present invention relates to a member and a method for manufacturing the member.

[0002]

2. Description of the Related Art In recent years, metal-ceramic composite materials, which are as lightweight as aluminum and have excellent features such as high rigidity as cast iron and steel, have been frequently used in various fields.

[0003]

However, although the metal-ceramic composite material has excellent features, it has a problem that the machining cost is greatly increased due to the difficulty in cutting.
There is also a problem that welding of the metal-ceramic composite material is difficult. In order to solve such a problem, various methods such as brazing and thermal spraying have been attempted to form a laminated structure with an aluminum member that can be welded with good workability, but in all cases, the bonding strength is sufficient. However, when heating and cooling are repeated, there is a problem that the joined portion is peeled off due to a difference in thermal expansion between the members of both layers.

The present invention has been made intensively in order to solve the above-mentioned problems, and has as its object to provide a technique for a highly reliable bonded laminated structural member and a method for manufacturing the same.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a composite material comprising a metal-ceramic composite material containing ceramic powder or ceramic fiber as a reinforcing material and aluminum or an aluminum alloy as a matrix and aluminum or an aluminum alloy. This is achieved by a laminated structural member in which a plurality of layers are laminated, wherein a sheet-like wire mesh is interposed near a boundary layer between the two layers. Another object of the present invention is to pour the molten metal of the lower layer into a mold in which a sheet-like wire mesh is pre-installed near where the boundary layer between the lower layer and the upper layer is formed, and the lower layer is completely solidified. And a step of pouring the molten metal of the member of the upper layer before.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. Known ceramics such as alumina, aluminum nitride, and SiC can be used as the ceramics in the present invention.
C is most preferred.

Next, in the present invention, the aluminum alloy is A
It is preferable to use an l-Si-Mg-based aluminum alloy because the wettability with ceramics is improved and uniform dispersion in the member is possible.

In the present invention, a mold is used in which a sheet-like wire mesh is previously installed near the boundary layer between the lower layer and the upper layer. The reason is that when pouring the molten metal of the upper layer before the lower layer is completely solidified, the flow of the molten metal may not completely mix the lower layer and the upper layer due to the moderate resistance of the wire mesh. Because it is gone. Therefore, there is an effect that the level of the boundary layer between the two layers is stabilized and the bonding state is improved.
Here, stainless steel or the like is used as the material of the wire mesh, and its wire diameter and aperture may be appropriately determined according to the thickness and size of the laminated structural member.

Further, the present invention proposes a method of manufacturing a laminated structural member in which the member of the lower layer is aluminum or an aluminum alloy and the member of the upper layer is a metal-ceramic composite material. The reason for this is that if the two layers are of opposite construction, the effect of replenishing the shrinkage of the member during the solidification and cooling process with a riser will not be sufficiently exhibited, and defects will occur in the metal-ceramic composite material of the lower layer, which is preferable. Because there is no.

Hereinafter, an embodiment of the present invention will be described with respect to a laminated structural member having two layers. However, the present invention is not limited to the following embodiment, and a laminated structural member having a plurality of multilayers can be formed by repeating lamination. Is obtained. It is also possible to use a metal-ceramic composite material layer having a different content of ceramic powder or ceramic fiber in place of the aluminum alloy layer.

(Embodiment) FIG. 1 is a schematic longitudinal sectional view of a mold 1 used in the embodiment. Here, 2 is an overflow port provided at a position where the thickness of the aluminum alloy layer as the lower layer is 30 mm, and 3 is a feeder. Reference numeral 4 denotes a sheet-like stainless steel wire net having a wire diameter of 0.8 mm and a mesh size of 3.1 mm, which is provided at a level where a boundary layer is to be formed by using kerosene.

An aluminum alloy-SiC composite containing 30% by volume of SiC in the upper layer than 6 is poured into the mold having the above structure by pouring molten metal of the aluminum alloy in the lower layer than 5 before the lower layer is completely solidified. Pouring the molten metal of the material, taking it out of the mold after cooling, 200 mm long, 200 mm wide, 5 mm thick
A laminated structural member of 5 mm was obtained.

[0013] As a result of observing the joint of the obtained laminated structural member by naked eye, it was confirmed that there was no crack or defect in the boundary layer between both layers, and that both layers were firmly joined.

[0014]

According to the present invention, there is an effect that a highly reliable laminated structural member can be obtained without peeling or cracking of the joint even after repeated heating and cooling.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a mold according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Type 2 Overflow port 3 Feeder 4 Wire mesh 5 Filler of molten aluminum alloy 6 Filler of molten aluminum alloy-SiC

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B32B 15/01 B32B 15/01 F C C22C 21/00 C22C 21/00 E 47/08 47/08 49 / 06 49/06 // C22C 101: 04 101: 04 101: 14 101: 14 101: 16 101: 16 (72) Inventor Etsuro Yokoyama 3-37-9 Higashi Ueno, Taito-ku, Tokyo F-term (Reference) 4F100 AA13 AA16 AA19 AB01B AB01C AB04 AB09 AB10A AB10C AB11 AB31A AB31C AD00A AD00C AD08 BA03 BA07 BA10A BA10C BA13 DC16B DE01A DE01C DG01A DG01C DH00A DH00C EH31 JK06 A08AB08A

Claims (4)

[Claims] 1. A laminated structural member in which a layer made of a metal-ceramic composite material using ceramic powder or ceramic fiber as a reinforcing material and aluminum or an aluminum alloy as a matrix and a layer made of aluminum or an aluminum alloy are stacked. A laminated structural member characterized in that a sheet-like wire mesh is interposed near a boundary layer between both layers. 2. A layer made of a metal-ceramic composite material using ceramic powder or ceramic fiber as a reinforcing material and aluminum or an aluminum alloy as a matrix, and a metal-ceramic composite different from the above-mentioned layer in the content of ceramic powder or ceramic fiber. A laminated structural member in which layers made of materials are laminated, wherein a sheet-like wire mesh is interposed near a boundary layer between both layers. 3. A step of pouring the molten metal of the lower layer into a mold in which a sheet-like wire mesh is previously installed near a boundary layer between the lower layer and the upper layer, and before the lower layer is completely solidified. 3. The method for producing a laminated structural member according to claim 1, comprising a step of pouring molten metal of the member of the upper layer. 4. The method according to claim 3, wherein the member of the lower layer is aluminum or an aluminum alloy, and the member of the upper layer is a metal-ceramic composite material.