JPH0712536B2 - Method for producing composite of ceramic and metal - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for producing a composite of a ceramics sintered body and a cast metal.

[Prior art]

Conventionally, in order to improve heat resistance, corrosion resistance, wear resistance, etc., a method of casting ceramics in a cast metal has been proposed.

However, when casting ceramics with cast metal, it often cracks due to thermal shock.Therefore, it is difficult to cast ceramics by heating or casting ceramics or using ceramics that does not crack. There were many.

Further, since the ceramics are integrally molded, if cracks occur, they propagate to the whole and are likely to fall off. Also, it is easily cracked and dropped off due to the load applied during use or the thermal shock applied at high temperature.

There is a proposal to evenly disperse the ceramic particles in the cast metal, but this method certainly eliminates the drawback of cracking, but because each particle exists independently, it is easy to fall off, and heat resistance, corrosion resistance, wear resistance, etc. In terms of characteristics, it is inferior to the casting of integrally molded ceramics.

Further, it is extremely difficult to disperse the ceramic particles in the high melting point metal.

[Problems to be solved by the invention]

The present invention has been made in order to improve the drawbacks of the conventional method for producing a composite of ceramic and metal as described above, and utilizes the heat resistance, corrosion resistance, wear resistance, etc. of ceramics to improve the use of casting parts. It is an object of the present invention to provide a method for producing a composite of ceramics and a metal, which is formed by casting ceramics into a package.

[Means for solving problems]

According to the present invention, an integrally molded plate-shaped ceramics sintered body, which is arranged in an orderly or random manner and has through holes at substantially regular intervals, is cast-in by a casting metal, and the ceramics and the casting metal are alternately present at regular intervals. The method for producing a composite of a ceramic and a metal is characterized in that the casting is performed as described above, and the method is characterized in that the casting is carried out under reduced pressure.

[Action]

According to the present invention, an integrally molded plate-shaped ceramics sintered body, which is arranged in an orderly or random manner and has through holes at substantially regular intervals, is cast-in by a casting metal, and the ceramics and the casting metal are alternately present at regular intervals. It is a method for producing a composite of ceramics and metal cast as described above. In such a composite, the ceramics and the cast metal are alternately present at substantially constant intervals, so that the ceramic is supported by the cast metal from the surroundings and is unlikely to fall off.

Further, even if a load is applied to the whole during use or a thermal shock is applied, the stress is dispersed and relaxed and cracks are less likely to occur because the cast metal exists in the ceramic in a substantially evenly dispersed state.

Further, since the plate-shaped ceramics have the holes penetrating through them, the casting operation is easy, and it is possible to manufacture even a refractory metal having a poor molten metal flow. If the pressure in the casting mold is reduced, the flow of molten metal becomes easier.

FIG. 1 shows the basic shape of the plate-shaped ceramic molded body 31 having the through holes 32, and FIG. 2 shows the shape of the plate-shaped ceramics 31 having the protrusions 33.

The plate-shaped ceramic molded body 31 is made of alumina, silicon carbide, silicon nitride, zirconia, or the like. Further, as the casting metal, cast steel, cast iron, copper alloy casting, aluminum alloy casting and the like can be used.

When it is necessary to cast the ceramic particles, the ceramic particles can be cast on the surface of the casting by casting an appropriate amount of the ceramic particles in the through holes of the plate-shaped ceramic. When the ceramics sintered body is cast and wrapped with a cast metal having a poor molten metal flow, heating the ceramics is effective, but the reduced pressure casting further improves the molten metal flow. Next, examples of the present invention will be described.

"Example" Example 1 First, the method of casting by depressurizing the mold will be described.

FIG. 3 is an explanatory diagram of the above method. In the figure, 1 is a mold, 2 is a casting metal casting hole, 3 is a ceramics sintered body having a through hole, and 4 is a vacuum box.

A ceramic sintered body 3 having a through hole is fixed in the mold 1, and the molten metal of the casting metal is cast while sucking the inside of the mold 1 with a vacuum pump separately provided as shown by the arrow. In this way
When the molten metal is cast, even if the through holes of the ceramic sintered body are thin, the cast metal can completely fill the through holes.

Example 2 FIG. 4 shows an example of a cast product in which a ceramic plate-like sintered body having through holes cast by the method of Example 1 is cast.

In the figure, reference numeral 5 is a cast metal of SCH13, and a plate-like body 3 of alumina ceramics is fixed to a part of the mold 1 at 1580 ° C.
Then, the casting metal 5 was cast. The molten metal completely flowed into the ceramic holes of the alumina ceramic plate 3, and the ceramics could be firmly fixed to the surface of the casting body 8. The ceramic is partially cracked, but it is fixed by the surrounding metal and does not fall off.

For example, the part of the part that comes into contact with high temperature cement clinker
Even when such a ceramic-metal composite body 10 was used in a high temperature atmosphere of ° C, it did not fall off, and the product life could be greatly extended.

Example 3 Next, an example in which the composite according to the method of the present invention is used as a lining material for a sintered ore shooter of a sintering machine will be described.

FIG. 5 is an example of a lining material cast of ceramics, and FIG. 6 is a case where the lining material cast of ceramics manufactured by the method of the present invention is used as a lining material of a sintered ore shooter of a sintering machine. FIG.

In the figure, 3 is ceramics, 6 is a steel plate, and 9 is sinter.

FIG. 5 shows the case where alumina is used as the ceramic 3 and 27% chromium cast iron is used as the cast metal 5, and the cast metal plate (composite body) 10 (100 × 100 × 100 mm) having the thickness of the cast metal of 5 mm and the ceramic of 20 mm is prepared by the method shown in the first embodiment. 100 x thickness 30 mm) was manufactured. As shown in FIG. 6, the cast-in-ceramics plate 10 was fixed by bolts onto a steel plate 6 which constitutes a sintered ore shooter of a sintering machine.

In this case, the sintered ore shooter was not damaged due to the high temperature of the sintered ore 9 due to the drop of the sintered ore 9, but the service life was extended by 2 to 3 times that of the conventional steel plate.

On the other hand, when only the ceramic was tested as the lining material, the ceramic was damaged by the drop impact of the sinter.

〔The invention's effect〕

According to the composite material of ceramics and metal according to the method of the present invention, (1) since the ceramics sintered body and the cast metal are alternately present at substantially constant intervals, the ceramics are less likely to crack and fall off, especially in a high temperature atmosphere. Is very effective when used with.

(2) Further, the casting operation is easy, and the ceramic is firmly fixed in the metal.

(3) Since ceramics can be integrally molded, the molding and sintering work is easy.

[Brief description of drawings]

1 is a shape explanatory view of a plate-shaped ceramics molded body, FIG. 2 is a shape explanatory view of a plate-shaped ceramics molded body having a projection,
FIG. 3 is an explanatory view of the method of the present invention, FIG. 4 is an explanatory view of a cast product in which a sintered body of alumina ceramics in Example 2 is cast-in, and FIG. 5 is an explanatory view of a lining material in which ceramics are cast-in. FIG. 6 is an explanatory view when the lining material in which the ceramics produced by the method of the present invention is cast-in is used as the lining material of the sintered ore shooter of the sintering machine. In the figure, 1: mold, 2: casting port, 3: ceramics sintered body having a through hole, 4: decompression box, 5: cast metal, 6: steel plate, 8:
Cast body, 9: sinter, 10: composite, 31: plate-like ceramics, 32: through hole, 33: protrusion. In the figure, the same reference numerals indicate the same or the same functions.

Claims (2)

[Claims] 1. An integrally molded plate-shaped ceramics sintered body, which is arranged in an orderly or random manner and has through holes at substantially regular intervals, is encased in a casting metal, and the ceramics and the casting metal are alternately arranged at regular intervals. A method for producing a composite of a ceramic and a metal, which is characterized by casting so as to exist. 2. The method for producing a composite of ceramics and metal according to claim 1, characterized in that the casting is carried out under reduced pressure.