JPH0221913B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for manufacturing a joined body of ceramics and a metal member.

BACKGROUND ART Ceramics are used for a variety of purposes because of their excellent heat resistance, wear resistance, insulation properties, and the like. Depending on these uses, it becomes necessary to attach metal members such as bolts, nuts, and other fixing members to the ceramic in order to connect the ceramic member to another member or to each other or to make them detachable.

Conventionally, due to the difficulty of processing ceramics, this attachment has been accomplished by (i) forming an engaging part for the metal member during firing of the ceramic, or (ii) baking a metal plate of copper, copper alloy, etc. onto the ceramic. The conventional method was to join the metal member by brazing the metal member onto the metal plate. However, the metal member engagement portion is easily damaged by the load applied through the metal member, and as shown in FIG.
When attaching the ceramic member 6 provided with 0 to another member 4, there is a problem that the engaging portion 61 may be damaged by the fastening force of the bolt 7. In addition, in the brazing method, the heat generated during brazing reaches the joint between the metal plate and the ceramic that has already been applied, and even reaches the deep part of the ceramic member, resulting in a decrease in the strength of the joint and weakening of the ceramic. There was a problem of inviting

Purpose of the invention The present invention solves the problems of these conventional techniques,
In particular, we have developed a method for manufacturing a joined body of ceramics and metal members, which does not require the provision of an engaging part for metal members, and which can obtain a large bonding strength without deteriorating the quality of the ceramics or causing no problems. The purpose is to provide.

Structure of the Invention The object of the present invention is to reduce arc-generating minute protrusions that are melted away due to the application of electricity during welding to the surface to be welded when joining a metal piece onto ceramics and welding the metal member onto the metal piece. This is achieved by a method of manufacturing a joined body of ceramics and a metal member, which is characterized in that capacitor discharge type stud welding is performed using the metal member having the above-mentioned structure.

The metal piece can be bonded to the ceramic by various commonly used methods. For example, the oxide ceramic is brought into contact with steel, nickel, or an alloy thereof, and at least the contact portion is coated with SiO. It can be obtained by heat bonding in an oxidizing atmosphere while embedded in SiO ₂ powder or mixed powder of SiO ₂ and kaolin.

Here, heat bonding is used in the case of copper or its alloys.
The heating is carried out at a temperature of about 1000 to 1200°C, preferably 1050 to 1150°C, and in the case of nickel or its alloy, about 1380 to 1500°C, preferably 1400 to 1450°C, for about 5 to 60 minutes, preferably 10 to 30 minutes.

Because of this thermal bonding, molten metal can penetrate not only downward but also upward and sideways against gravity, so metal that is in contact with the bottom or side of the ceramic will be as strong as if it was in contact with the top. Similarly, it is possible to join with high strength, and joins at two or more locations can be obtained in one operation. In addition, by heating and bonding while immersed in the powder, the temperature rise, heating, and cooling after bonding are uniform, so uneven bonding and cracks are eliminated, and irregularly shaped copper, nickel, or When the alloy is bonded, parts other than the bonded part do not deform.

Furthermore, the joining of the metal piece onto the ceramics is as follows:
It can also be obtained by placing oxide ceramics in a mold, preheating the ceramics, pouring molten copper or its alloy into the mold, and then cooling and solidifying the ceramic. Here, the preferable preheating temperature is usually about 200℃ or higher, and 500℃ or higher.
It is particularly preferable to set the temperature to about .degree. C. or higher. The melting and heating temperature of copper or its alloy is usually about 1080 to 1300°C, preferably 1100 to 1200°C. As a result, it is possible to easily join not only simple shaped metal pieces but also metal pieces with various shapes obtained by ordinary casting, such as metal pieces with curved surfaces, while achieving the same or higher joining strength than when using conventional joining methods. It can be held and bonded onto ceramics.

EXAMPLES The present invention will be described below with reference to the accompanying drawings, taking as an example the production of a joined body of a ceramic piece and a bolt.

To manufacture a joined body of ceramic piece 1 and bolt 2, first, metal plate 3 is joined onto ceramic piece 1 as shown in FIG. As mentioned above, this bonding is performed by immersion in SiO ₂ powder,
In addition to the method of pouring molten metal, various conventional methods can be used. Next, the bolts 2 are placed on the metal plate 3, the metal plate 3 and the bolts 2 are connected to various electrodes, and capacitor discharge type stud welding is performed. Bolt 2 is placed on the surface to be welded,
It is provided with a conical protrusion 20 suitable for capacitor discharge type stud welding and a minute protrusion 21 at the tip of the protrusion 20. The dimensions and shapes of these raised portions 20 and protrusions 21 can be determined as appropriate depending on the dimensions of the bolts to be joined, the voltage and current during welding, and the like. By energizing, the minute protrusions 21 are melted and an arc is generated between the bolt 2 and the metal plate 3, and the downward force applied to the bolt 2 along with the energization presses the parts melted by the arc heat to perform welding. . The welding area is heated by an arc discharge of electrical energy stored in the capacitor, which generates a sufficient amount of heat.
And it's done instantly. Therefore, bolt 2
and the metal plate 3 are welded with sufficient strength, and the transfer of heat to the joint between the metal plate 3 and the ceramic piece 1 and to the ceramic piece 1 is suppressed to an extremely low level. Thereby, it is possible to prevent the joint portion and the ceramic from being altered or weakened by heat, and as a result, a large joint strength between the bolt 2 and the ceramic piece 1 can be obtained.

Moreover, since the bolt 2 can be joined to the ceramic piece 1 without providing an engaging part, when attaching the ceramic piece 1 to another member 4 using the bolt 2 and nut 5, as shown in FIG. bolt 2
The ceramic piece 1 will not be damaged by the fastening force.

Although the manufacturing of a joined body of a ceramic piece and a bolt has been described above, it goes without saying that the method of the present invention can be applied to various forms of ceramics and metal members. Further, the metal piece interposed between the ceramic and the metal member can also have various shapes such as a plate shape and a block shape.

Next, an experimental example of the present invention and a comparative example of the prior art will be shown.

Experimental Example As shown in Figure 5, a ceramic piece 1A with a square plane of 10 mm on each side and a thickness of 4 mm was
SiO ₂
Heat bonding was performed while immersed in powder. A bolt 2A was welded onto the bonded copper plate by capacitor discharge type stud welding. Bolt 2A has a length of 12 mm and a diameter of 5
mm, the material is SUS304, the inclination angle α (see Figure 2) of the conical protrusion is 4°, and the diameter d of the microprotrusion is
The length l of the protrusion was 0.8 mm. When the resulting joint was subjected to a tensile test, the load was
Fractured at weld A at 700 kg.

Comparative Example As shown in FIG. 6, a ceramic piece 1B having the same shape as the experimental example and a copper plate 3B were bonded together by heating in the same manner as described above. Bolts 2B were joined onto the bonded copper plate by ordinary brazing. The bolt 2B had the same dimensions and material as the experimental example, except that it did not have a conical protuberance or a microprotrusion. After performing a tensile test on the resulting joint, the load
It broke at 420Kg near the joint B of the ceramic pieces.

From the above experimental examples and comparative examples, the following is clear. According to the method of the present invention, the bolt and the copper plate can be welded with sufficient strength, and the heat during welding does not affect the strength of the joint between the copper plate and the ceramic piece and the ceramic piece. , a bond with great strength was obtained. In contrast, in the conventional method, the ceramic becomes brittle due to the heat effect during soldering, resulting in a reduced strength of the joined body.

Effects of the Invention As is clear from the above, according to the present invention, it is not necessary to particularly provide an engaging portion for a metal member, and high bonding strength can be obtained without deteriorating the quality of ceramics or causing no problems. It is possible to provide a method for manufacturing a joined body of ceramics and a metal member.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams for explaining the method of the present invention. Figure 1 is a front view showing a ceramic piece, metal plate, and bolt, Figure 2 is a front view of the bolt, and Figure 3 is a front view of the ceramic piece, metal plate, and bolt. 4 is a front view showing a ceramic piece, a bolt, other members and a nut to explain joining by a conventional method, and FIG. 5 is an explanation of an experimental example of the present invention. FIG. 6 is an explanatory diagram of a comparative example of the conventional method. 1...ceramics piece, 2...bolt, 3...
Copper plate, 21... minute protrusions.

Claims (1)

[Claims] 1. When joining a metal piece onto ceramics and welding a metal member onto the metal piece, use the metal member whose surface to be welded has minute protrusions for arc generation that melt away due to energization during welding, A method for manufacturing a joined body of ceramics and metal members, characterized by performing capacitor discharge type stud welding.