JPS60247477A - Production of joint body between ceramics and metallic member - Google Patents

Abstract

PURPOSE:To obtain a titled joint body having high joint strength without deteriorating the quality of ceramics by joining a metallic member formed with a slight projection, by capacitor discharge type stud welding, onto a metallic piece joined on the ceramics. CONSTITUTION:The metallic plate 3 is joined by a suitable method onto a ceramic piece 1 by a suitable method. The metallic member such as a bolt 2 is imposed on the plate 3 and is subjected to capacitor discharge type stud welding by connecting the plate 3 and the bolt 2 to electrode. A circular conical build-up 20 and the slight end projection 21 suitable for stud welding are preliminarily provided to the welding surface of the bolt 2 in this stage. The projection 21 disappears and the arc is generated between the bolt 2 and the plate 3 when electricity is conducted to the electrodes in the stage of welding. The molten parts are thus brought into press contact with each other, by which the bolt and plate are welded. The bolt 2 and plate 3 are welded with substantial strength. The heat transfer to the plate 3 and the piece 1 is suppressed to a low level. As a result, the high joint strength between the bolt 2 and the piece 1 is obtd.

Description

[Detailed Description of the Invention] Itkakechi! The present invention relates to a method for manufacturing a joined body of ceramics and metal members.

Raw ceramics have excellent heat resistance, abrasion resistance, insulation properties, etc., and are therefore used for various purposes. Depending on these uses, it may be necessary to attach metal members such as bolts, nuts, or 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 done by (1) forming an engaging part for the metal member during firing of the ceramic, or (11) attaching copper or copper on the ceramic.
This has been carried out by joining metal plates such as copper alloys by baking or the like, and then brazing a metal member onto the metal plates.

However, the metal member engagement portion is easily damaged by the load applied through the metal member, and as shown in FIG. 4), bolt (1)
There was a problem in that the engaging portion (61) could be damaged due to the fastening force. In addition, in the above brazing method, the heating of the soldering 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, reducing the strength of the joint and making the ceramic brittle. There was the problem of inviting people.

The present invention solves these problems of the prior art, eliminates the need to provide a retaining part for metal members, and allows for large joints without deteriorating the quality of the ceramics or causing no problems. It is an object of the present invention to provide a method for manufacturing a joined body of ceramics and a metal member that can obtain strength.

The object of the present invention is to weld a metal piece onto a ceramic and, when welding a metal member onto the metal piece, to weld arc-generating minute protrusions that are melted away by electricity during welding. This is achieved by a method of manufacturing a joined body of a ceramic and a metal member, which is characterized in that capacitor discharge type stud welding is performed using the metal member having the metal member on the surface thereof.

The metal piece can be bonded to the ceramic by various commonly used methods. For example, the oxide ceramic is brought into contact with copper, nickel, or an alloy thereof, and at least the contact portion is bonded with 5IC)2. It can be obtained by heat bonding in an oxidizing atmosphere while embedded in a powder or a mixed powder of 5102 and kaolin.

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

Due to this thermal adhesion, molten metal can penetrate not only downward but also upward and sideways against gravity, so metal that is brought into contact with the underside or sideways of the ceramic is the same as when it is brought into contact with the upper side. It can be bonded with high strength to two or more points of force in one operation. In addition, by heating and bonding while immersed in the powder, the temperature rise, heating, and cooling after bonding are uniform, eliminating uneven bonding and cracks. When the alloy is bonded, parts other than the bonded part do not deform.

In addition, to join the metal piece onto the ceramic, oxide ceramics are placed in a mold, the ceramic is preheated, and then molten copper or its alloy is poured into the mold and then cooled and solidified. It can also be obtained by doing. Here, the preferable preheating temperature is usually about 200°C or higher, and particularly preferably about 500°C or higher.

The melting heating temperature of copper or its alloy is usually 1080 to 130
The temperature is about 0°C, preferably 1100 to 1200°C. As a result, it is possible to easily form metal pieces of various shapes obtained by ordinary casting, such as metal pieces with simple shapes as well as metal pieces with curved surfaces, while achieving a bonding strength equal to or greater than that achieved by conventional bonding force. It can be bonded onto ceramics.

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

In order to manufacture a joined body of ceramic piece (1) and bolt (2), first, as shown in FIG.
) on which the metal plate (3) is bonded. As described above, this joining can be performed by various conventional methods, in addition to the method of embedding F in 8102 powder and the method of pouring molten metal. Next, the bolt (2) is placed on the metal plate (3), the metal plate (3) and the bolt (2) are connected to the electrodes, and capacitor discharge type stud welding is performed. Pol)−
(2) has a conical ridge (20) suitable for capacitor discharge type stud welding and the ridge (2) on the surface to be welded;
0) Equipped with a microprotrusion (21) at the tip. The dimensions and shapes of these raised portions (20) and protrusions (21) can be adjusted as appropriate depending on the dimensions of the bolts to be joined, the voltage and current during welding, and the like. When energized, the micro protrusions (21) are melted away and an arc is generated between the bolt (2) and the metal plate (3), and due to the downward force applied to the bolt (2) along with the energization, the parts melted by the arc heat are melted together. are pressed together and welding is performed. The welding zone is heated instantaneously with a sufficient amount of heat by arc discharge of electrical energy stored in the capacitor. Therefore, the 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 Hiramix piece (1) and the ceramic piece (1) is prevented. It can be held extremely low. 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.

Further, since the bolt (2) can be joined to the ceramic piece (1) without providing an engaging part, the bolt (2) and the nut (5) can be used to connect the ceramic piece (1) as shown in FIG. ) to another member (4), use the 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. In addition, metal pieces interposed between ceramics and metal members can also be plate-shaped,
It can be made into various shapes such as a block shape.

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

[Experiment example]

As shown in Fig. 5, a copper plate (3A) with a square surface of 101 sides and a thickness of Q and 5 mm is placed on a ceramic piece (1A) with a square plane of 10U+ sides and a thickness of 4mm.
I! Heat bonding was performed while immersed in powder. A bolt (2A) was welded onto the bonded copper plate by capacitor discharge type stud welding. The bolt (2A) has a length of 12 mm and a rolling diameter of 5 ms.
, the material is 5US304, the inclination angle (α) of the conical protrusion (see Figure 2) is 46, and the diameter of the microprotrusion (d)
is 0.6ev, and the length Q) of the protrusion is 0.6ev. It was all. When the resulting joined body was subjected to a tensile test, it broke at the welded part (A) under a load of 700 ko.

[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. A bolt (2B) was joined onto the bonded copper plate by a normal zero-point connection. 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. When the resulting joined body was subjected to a tensile test, the ceramic pieces near the joint (B) broke under a load of 420 ko.

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. On the other hand, in the conventional method, the ceramic becomes brittle due to the heat effect of waxing, and as a result, the strength of the bonded body is reduced.

1) As is clear from the above, according to the present invention, there is no need to provide an engaging part for metal members, and large bonding can be achieved without deterioration of ceramics or without causing any problems. It is possible to provide a method for manufacturing a joined body of ceramics and a metal member that can obtain strength.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams for explaining the method of the present invention.
Fig. 1 is a front view showing the ceramic piece, metal plate and bolt, Fig. 2 is a front view of the bolt, Fig. 3 is a front view showing the obtained joined body together with other parts, and Fig. 4 is a front view showing the conventional method. A front view showing a ceramic piece, a bolt, other members and a nut to explain the joining, FIG. 5 is an explanatory diagram of an experimental example of the present invention, and FIG. 6 is an explanatory diagram of a comparative example of the conventional method. (1)...Ceramic piece, (2)...Bolt, (3)...Copper plate, (21)...Minute protrusion (or more) No. Figure 1 Figure 2 Figure 5 Figure 6 Figure 3 Figure 4

Claims (1)

[Claims] ■ 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 arc-generating protrusions that melt away when electricity is applied during welding, A method for manufacturing a joined body of ceramics and metal members, characterized by performing capacitor discharge type stud welding.