JPH0525589B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a joined body composed of ceramics and metal and a method for manufacturing the same, and particularly relates to a joined body by casting means and a casting method. be.

[Conventional technology]

In recent years, ceramics, which have excellent heat resistance, abrasion resistance, and high-temperature strength, are attracting attention as structural materials because they can be produced with high quality and consistency. However, in order to use ceramics as a structural material, it goes without saying that it is necessary to further improve the quality of the material itself and reduce its price.
High strength and reliable bonding technology is essential. In other words, even if a complex-shaped part can be integrally molded with ceramics and processed into the final shape, a single material cannot completely satisfy the strength, toughness, and other properties required for a structural material. Therefore, only the necessary parts are made of ceramics, the other parts are made of conventional metal materials, and the two parts are combined and joined to strengthen each other's weaknesses and take advantage of the characteristics of both parts. is planned.

Casting is known as the most common means for joining ceramics and metals. In other words, a member that has been molded into a predetermined shape using ceramics is placed in a predetermined position in a mold, and then molten metal is injected to form the metal part of the structure, and the ceramic is cast using the casting metal. It is integrated by joining all the way around. In this case, since the shrinkage rate of metal is significantly higher than that of ceramics, the compressive stress generated due to cooling shrinkage after solidification of the cast metal causes
Often destroyed by ceramics. As a means to eliminate this drawback, a method has been proposed in which a buffering material such as ceramic fiber or an organic coating layer is provided at the bonding interface between ceramic and metal.
However, in these methods, it is necessary to integrally form the casting protrusion on the ceramic member. Ceramics is generally a material that is very difficult to process, so processing after molding is extremely difficult and takes a long time, especially when integral molding is used. In addition, providing a buffer coating on the surface of the casting protrusion before joining the casting with metal materials will unnecessarily increase the number of steps, which will not only hinder productivity but also reduce the joining effect. This will have a negative impact. Therefore, it is desirable that the ceramic member has a simple shape, and that the joint portion with the metal is direct.

[Problem that the invention seeks to solve]

The present invention solves the above-mentioned drawbacks of the prior art, adopts the most common casting means that is excellent in mass production for joining ceramics and metal, and provides the most effective joined body and method for joining the same. The purpose is to provide the following.

[Means for solving problems]

In order to achieve the above object, the present invention employs the following technical means.

That is, in the first invention, a joined body is constructed by fixing a base material made of ceramics and a protrusion made only of a metal material, and closely adhering a cast metal to the outer peripheral surface of the protrusion.

Next, the second invention is a method for manufacturing the above-mentioned ceramic-metal bonded body, in which protrusions made only of a metal material are abutted against a base material made of ceramics, either directly or through a fixing material, heated and/or Alternatively, the protrusions are fixed to the base material by applying pressure to form a ceramic member, and the ceramic member is previously placed in a predetermined position in a mold, and the ceramic member is cast through the protrusions.

Furthermore, a third invention is, in the second invention,
A means is added for plastically deforming a protrusion made of only a metal material when fixing it to a base material to form an uneven portion on the outer circumferential surface.

[Effect]

The part where the cast metal joins the ceramic member is the outer peripheral surface of the protrusion made only of metal material fixed to the ceramic base material, so the compressive stress due to cooling shrinkage after solidification of the cast metal is absorbed from the ceramic. It does not reach the base material part at all. Therefore, it has the effect of preventing destruction of hard and brittle base materials.

In addition, since the base material and the protrusion are strongly joined and integrated, either directly or through an adhesive material, the base material and the cast metal are also strongly integrated by the cast-in connection of the protrusion with the cast-in metal. It is. In this case, if an uneven portion is formed in advance on the outer circumferential surface of the protrusion, the resistance to the axial load of the protrusion is particularly increased, and the pull-out prevention effect is increased.

〔Example〕

FIG. 2 is an explanatory diagram of a ceramic member in an embodiment of the present invention. In the figure, 1a is a base material made of ceramics, for example, 15 mm square x 5 mm.
It has a size of thickness. 2a is a protrusion made of aluminum alloy, and has a size of, for example, 6 mm square x 7 mm long. Therefore, in order to bond and integrate the two, if the protrusion 2a is crimped to the fixing surface 1b of the base material 1a with a pressure of 0.2 to 1 Kg/mm ² at 610°C, the ceramic consisting of the base material 1a and the protrusion 2a can be bonded. A member is obtained. This ceramic member is placed in a predetermined position in a mold (not shown) in advance, that is, the bonding surface including the fixed surface 1b of the base material 1a and the protrusion 2a
If the molten aluminum alloy is injected into the mold cavity, the molten metal will flow into the protrusion 2a.
Since it comes into contact with the outer circumferential surface of the ceramic and adheres closely after solidification, it is possible to obtain a bonded body between the ceramic and the metal.

FIG. 3 is a diagram showing another example of a ceramic member, in which a protrusion 2b made of an iron-based material and a base material 1a are fixed with a foil 4 made of Al or an Al alloy interposed therebetween. . This is convenient when fixing a protrusion made of a metal material that has low affinity with ceramics.

Figure 4 shows protrusion 2 in Figures 2 and 3.
FIGS. 2A and 2B are cross-sectional views of FIGS. 2A and 2B, and by selecting a shape in which the distance from the center of the figure to the peripheral contour line is different in this way, there is an effect of preventing the protrusion or ceramic member from rotating after casting.

FIG. 5 is a diagram showing still another example of the ceramic member, in which an uneven portion is provided on the outer peripheral surface of the projection 2c. If formed in this manner, the effect of preventing the ceramic member from being pulled out after being cast is further increased. The protrusion 2c shown in FIG. 5 may be formed in advance in this way and then fixed, but the protrusion 2c
By adjusting the temperature and/or pressure when abutting against a, the protrusion 2c can be plastically deformed from the state shown by the chain line. In this case, in order to prevent the protrusion 2c from buckling, it is effective to insert a guide or a mold (none of which is shown) provided with a recess corresponding to the deformed contour on the outer periphery of the protrusion 2c.

FIG. 1 is a diagram showing an embodiment of the present invention, and is a rocker arm used in an automobile engine or the like. In the figure, 1 is a chip made of silicon nitride, and a protrusion 2 made of aluminum alloy is fixed to form a chip member in advance. After this is inserted into a predetermined position in the mold, aluminum alloy 3 is injected. The chip member is cast by casting.
After casting, no abnormalities in the joints, cracks in the base material, or other defects were observed in the rocker arm.

In this embodiment, a molten aluminum alloy is used as the casting metal, but other casting metals such as cast iron can be used by appropriately selecting the material of the protrusions forming the ceramic member. In addition to the metal foil shown in this example, the fixing material to be interposed between the fixing surface of the base material and the protrusion can be a thin plate or a film, and plating or metallizing can also be used. . Furthermore, the casting means can be applied not only to the usual gravity structure but also to die casting and molten metal forging. In addition to metal materials, inorganic materials such as oxides, nitrides, and borides can also be used as the fixing material, and are appropriately selected in consideration of the base material, the material constituting the protrusion, and other conditions.

〔Effect of the invention〕

As described above, the present invention utilizes the most common casting means that is excellent in mass production, and is capable of producing composite materials that have heat resistance and/or wear resistance only in necessary parts, and are inexpensive or tough in other parts. Since it is obtained by the above method, the following effects can be achieved.

(1) Even structural members with relatively complex shapes can be easily mass-produced.

(2) If the ceramic is a difficult-to-process material, there will be fewer parts to process, so processing time can be shortened.

(3) The compressive force after solidification due to the cast metal only acts on the protrusions made only of the metal material that constitutes the ceramic member;
Does not cause cracking or other negative effects on ceramic parts.

(4) Since the fixed integration of the base material and the protrusion is a strong bond that includes butt heat diffusion matching, the strength of the ceramic member is sufficiently guaranteed, and there is little variation and high reliability.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, FIGS. 2, 3 and 5 are front views showing an example of a ceramic member in an embodiment of the present invention, and FIGS. Figure b is a cross-sectional view of the protrusion in each embodiment of the present invention. 1: Chip, 1a: Base material, 2, 2a, 2b: Projection, 3: Aluminum alloy, 4: Foil.

Claims (1)

[Scope of Claims] 1. A joined body of ceramics and metal, characterized in that a base material made of ceramics and a protrusion made only of a metal material are fixed to each other, and a cast metal is closely attached to the outer peripheral surface of the protrusion. 2. A joined body of ceramics and metal according to claim 1, wherein the metal material constituting the protrusion and the cast metal are the same material. 3. A joined body of ceramics and metal according to claim 1 or 2, wherein the cast metal is Al or an Al alloy. 4. A joined body of ceramics and metal according to claim 1 or 2, wherein the cast metal is an iron-based alloy. 5. The metal material constituting the protrusion is an iron-based alloy,
A joined body of ceramics and metal according to claim 1, wherein the cast metal is a non-ferrous alloy. 6. A joined body of ceramic and metal according to any one of claims 1 to 5, wherein the ceramic is a silicon-based ceramic. 7. A protrusion made only of a metal material is butted against a base material made of ceramics, either directly or through a fixing material, and heated and/or pressurized to fix the protrusion to the base material to form a ceramic member. 1. A method for manufacturing a joined body of ceramics and metal, characterized in that the ceramic member is charged in advance at a predetermined position in a mold, and the ceramic member is cast through the protrusion. 8. A protrusion made of only a metal material is butted against a base material made of ceramics, either directly or through a fixing material, and heated and/or pressurized to fix the protrusion to the base material, and at the same time plastically deform the protrusion to form an outer circumferential surface. A joined body of ceramics and metal, characterized in that a ceramic member having an uneven portion is formed on the surface of the ceramic member, the ceramic member is placed in a predetermined position in a mold in advance, and the ceramic member is cast through the projections. manufacturing method. 9. The method for producing a joined body of ceramics and metal according to claim 7 or 8, wherein heating and/or pressurization is performed in a non-oxidizing or weakly oxidizing atmosphere. 10. The method for manufacturing a joined body of ceramics and metal according to any one of claims 7 to 9, wherein the metal material is Al or an Al alloy. 11. The method for manufacturing a joined body of ceramic and metal according to any one of claims 7 to 10, wherein the ceramic is a silicon-based ceramic.