JPS5930782A - Manufacture of ceramics-metal complex body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a frame-shaped ceramic-metal composite.

[Technical Background of the Invention and Problems thereof] Rectangular or circular ceramic-metal composites have been used in electrical equipment and other applications.

In order to manufacture such a frame-shaped ceramic-metal composite, a ceramic such as powdered alumina or silicon nitride is compression molded into a frame shape using a mold using a small amount of organic binder, and then fired. Alternatively, compression mold it into a plate shape, then hollow out the medium heat part to make a frame shape, and then fire it to produce a frame-shaped ceramic molded body, which is then subjected to metallization treatment and nickel plated to make a frame-shaped metal member. A method of joining by brazing is used.

In such a method, especially when manufacturing a thin one-frame ceramic-metal composite, the strength of the ceramic molded body during molding is insufficient and it is easily broken, and it also suffers from shrinkage during the firing process. This has the disadvantage that the ceramic molded body is twisted and the corners of the ceramic molded body become rounded.

Further, even if a ceramic molded body with a good shape is obtained, there is a problem in that it is easily deformed due to the high temperature during brazing with a metal member.

[Object of the invention] The object of the present invention is to provide a method for manufacturing a frame-shaped ceramic-metal composite that does not have such problems, that is, does not suffer from breakage during molding or deformation during firing and joining with metal members. shall be.

[Summary of the Invention] That is, the method of the present invention is characterized in that a ceramic molded body with a bottom is prepared, a metal member is bonded to the top surface of the molded body after firing the body, and then the bottom portion thereof is removed.

Examples of the ceramic molded body used in the present invention include silicon dioxide, alumina, and silicon nitride.

Metal members used in the present invention include copper, iron, chromium,
Examples include a single substance, an alloy, or a mixture of nickel, molybdenum, silver, cobalt, aluminum, etc., and the shape thereof should be adapted to the joint surface of the ceramic molded body.

Next, the method of the present invention will be explained with reference to the drawings.

First, as shown in Fig. 1(a), the upper surface of the ceramic molded body before firing is cut at the center of the upper surface to a certain depth d so that edges with predetermined widths β1 and β2 are formed on the periphery. After the bottomed ceramic molded body 1 is molded and the bottomed ceramic molded body 1 is fired, a frame-shaped metal member 2 is joined to the upper surface of the ceramic molded body.

Next, as shown in FIG. 1(b), the body of the bottomed ceramic molded body 1 is cut parallel to the bottom surface at a depth d position E, and the bottom portion 3 is removed. ) The ceramic-metal composite of the present invention is obtained.

Note that the bottom of the bottomed ceramic molded body may have a partially penetrating hole. The bottom part here needs only have enough strength to prevent the edge part from being deformed during the firing process.

Furthermore, as shown in FIG. 2(a), a groove 5 of a predetermined depth d is cut on the upper surface of the ceramic molded body before it is bonded to a metal member using an end mill or the like, and after firing, the groove 5 is It is also possible to join the parts together. In this case, as shown in Fig. 2(b), the groove depth position E
A ceramic-metal composite is obtained by cutting parallel to the bottom surface and removing the bottom portion 3 and the center portion 6.

Figure 3 shows a ceramic plate with ribs extending from the edge.
FIG. 2 is a perspective view showing a metal composite. As a method for joining the ceramic molded body and the metal member, it is also possible to metalize the top surface of the ceramic molded body in advance, plate it with nickel, and braze the metal member, but the following method can also be used to directly form the ceramic body. It is desirable to join the body and the metal member.

In other words, surface treatment of metal parts with a binding agent such as oxygen,
Alternatively, a method in which a metal member is made to contain a binder, placed in contact with a ceramic molded body, and heated in an inert gas such as nitrogen gas, or a metal member that does not contain a binder or is not treated with a binder. When using a member, it is desirable to place the metal member in contact with the ceramic molded body and heat it in a gas atmosphere containing a carbon binder.

The binder used in the present invention forms a eutectic alloy with the metal, and examples include oxygen, sulfur, phosphorus, and silicon. These are appropriately selected depending on the respective types and combinations of the ceramic molded body and the metal. For example, when the metal is copper, iron, or chromium, oxygen or sulfur is suitable as a binder, and when the metal is aluminum, silicon is suitable.

The temperature at which the ceramic molded body and the metal member are brought into contact and heated is preferably below the melting point of the metal and above the eutectic temperature of the eutectic alloy of the metal and the binder.

For example, if the metal is copper and the binder is oxygen, the melting point of copper (1
'083℃) or lower, the eutectic temperature of copper-copper oxide (106'5
℃) or more.

In addition, when the ceramic molded body is a non-oxide ceramic such as silicon nitride, it is preferable that the ceramic molded body is previously surface-treated with a binder or is impregnated with a binder, and then brought into contact with a metal member and heated. That is, when the binder is oxygen, the ceramic molded body is oxidized or the ceramic molded body is made to contain an oxide.

The reason why this direct contact method is preferable is that the brazing method described above requires at least two heat treatments, whereas direct bonding requires only one heat treatment.

[Embodiments of the invention] Next, examples of the present invention will be described.

Example 1 90 parts by weight of alumina, 10 parts by weight of silica, calcia, and magnesia, 1 part by weight of polyvinyl alcohol resin as a binder, and 5 parts by weight of paraffin wax were mixed and molded using a mold with a flat cavity. 1 ton
Compression molded at a pressure of ,/cl, 80 u x 50
A green compact of 5 inches x 5 inches was obtained.

This is the width, f21 = A2 = 2.5, and the depth d
Figure 1 (a)
A bottomed ceramic molded body shown in FIG.

After firing this at 1500°C, a copper foil made of tough pitch copper having a thickness of 0.07 mm and having a shape that fits the top surface of the ceramic molded body was placed in contact with the top surface of the ceramic molded body, and heated at 1075°C in a nitrogen gas atmosphere. Heated for 10 minutes.

After cooling to room temperature, the body was cut parallel to the bottom using a tire cutter and the bottom was removed to obtain a ceramic-metal composite with a thickness of 4 mm. In this way, 100 ceramic-metal composites were obtained, and none of the ceramic-metal composites exhibited shrinkage or other deformation that would pose a practical problem.

100 pieces of frame-shaped ceramic molded bodies obtained by compression molding using a one-sided frame-shaped mold with a width of 17 bits, metallizing treatment, nickel plating, and brazing metal parts. Deformation was observed in 50 of them.

Example 2 A powder compact of 80 mu x 80 mu x 5 ml was obtained using the same material as in Example 1 at a molding pressure of 1 ton/cl.

As shown in FIG. 3, this molded body was cut with an end mill so as to leave edges and ribs with a width of 3n. After firing this at 1500'C, a surface oxidized copper foil having a thickness of 0.07 nm and having a size suitable for the upper surface was placed in contact with the upper surface of the ceramic molded body, and heated in the same manner as in Example 1. After cooling to room temperature, the bottom portion was removed to produce a frame-shaped ceramic-gold composite. This ceramic-metal composite was not deformed, and in particular there was almost no displacement of the rib portion.

[Effects of the Invention] As is clear from the above description, according to the method of the present invention, a frame-shaped ceramic-metal composite is produced which is of high quality, large, and has a good yield, without being damaged during molding or deformed during firing, bonding, etc. You get a body.

[Brief explanation of drawings]

FIG. 1(a) is a perspective view showing the bottomed ceramic molded body being joined to a metal member, FIG. 1(b) is a cross-sectional view after joining, and FIG. 1(C) is a Fig. 2(a) is a cross-sectional view of the product with the bottom removed at E in b); Fig. 2(a) is a perspective view of the bottomed ceramic molded body and the metal member joined; Fig. 2(b)
is a sectional view taken along line I-I' in Figure 2(a);
The figure is a perspective view for explaining a method of manufacturing a ceramic-metal composite. 1......Bottomed ceramic molded body 2
......Metal member 3...Bottom part 4...Ceramics-metal composite (7317) Representative Patent Attorney Kensuke Norichika (and 1 other person)

Claims (5)

[Claims] (1) A method for producing a ceramic-metal composite, which comprises preparing a ceramic molded body with a bottom, firing it, joining a metal member to its top surface, and then removing its bottom. (2) The method for manufacturing a ceramic-metal composite according to claim 1, wherein the bottomed ceramic molded body is obtained by cutting. (3) The method for producing a ceramic-metal composite according to claim 1 or 2, wherein the metal member contains a binder and is directly joined to the ceramic molded body using -C. (4) The method for manufacturing a ceramic-metal composite according to claim 1 or 2, wherein the metal member is surface-treated with a binder and directly joined to the ceramic molded body. (5) The method for manufacturing a ceramic-metal composite according to any one of claims 1 to 4, wherein the metal member is made of copper.