JPS59227782A - Method of bonding metal member to ceramic board - 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] [Field of Application of the Invention] The present invention relates to a method for bonding a ceramic plate to a metal member, and particularly a method for bonding a large-area ceramic plate to a metal member.
Two preferred methods are described.

[Prior art]

In recent years, non-oxide ceramics such as silicon nitride, silicon carbide, and sialon, as well as so-called new ceramics such as aluminum oxide and zirconium oxide, have rapidly attracted attention as high-temperature, high-strength structural materials, and much research and development has been conducted. These ceramics have many uses as gas turbine rotors, blades, combustor inner surfaces, diesel engine cylinders, pistons, and other high-temperature mechanical parts, but all of them have strict requirements for shape and dimensional accuracy, so they must be made in one piece from the beginning. It is often difficult to mold and manufacture as such. For this purpose, it is necessary to join partial products together to create products with complex shapes, and there is a desire to develop a method for firmly joining ceramics and metals. In addition, the use of composite materials that combine the strength, toughness, and other properties of metal parts with the heat resistance, abrasion resistance, and corrosion resistance of ceramics is steadily expanding. In order to further expand its use, it is expected that a method for easily joining plate-shaped ceramics to metal members will be developed.

A brazing method is one of such joining methods with high joining strength. However, when joining by conventional brazing methods, residual stress is generated in the joined members due to heating during brazing, which may cause the joint to break. Such problems are particularly likely to become apparent when attaching thin ceramic plates to large parts to improve heat insulation, wear resistance, etc.

[Object of the Invention J The object of the present invention is to solve the problems of the above-mentioned prior art, to control bonding strength, and to enable bonding with small residual stress.
An object of the present invention is to provide a method for joining a ceramic plate to a metal member.

[Overview of the invention]

In order to achieve this object, the present invention provides a method for joining a ceramic plate to a metal member, in which a ceramic plate having a lower melting point than both the gold Jf4 member and the ceramic plate is provided between the metal member and the ceramic plate. The metal member and the ceramic plate are bonded by interposing an insert metal, applying an alternating magnetic field from the front side of the ceramic plate, and melting the insert metal by heating the insert metal with a tributary frequency wave. The gist of this paper is a method for joining a ceramic plate to a metal member.

FIG. 1 is a sectional view showing a joining method according to an embodiment of the present invention, and shows a method of joining a ceramic plate 1 and a metal member 3. As shown in FIG. Note that FIG. 2 is a perspective view of FIG. 1. In the present invention, as shown in the figure, an insert metal 2 is interposed between a ceramic plate 1 and a metal member 3, and the ceramic plate 1
An alternating magnetic field is applied from the front side using means such as a high-frequency induction heating coil 4, and the surfaces of the insert metal 2 and metal member 3 are selectively subjected to high-frequency induction heating, thereby melting the insert metal and bonding the ceramic plate 1 and the metal. This is a method of joining the member 3. In the figure, 4A is the lead terminal of the coil 4, and 5 is the coil 4 (=the part that is heated and melted by applying high-frequency current. In this example, the coil 4 is moved as shown by the arrow. are doing.

In the present invention, the material of the ceramic member is not particularly limited, but a material with high electrical resistance and close to an insulator is preferable. Further, in the present invention, if the surfaces of the ceramic plates to be bonded are previously subjected to a metallization process such as a metallization process in which a thin metal film is coated, the bonding strength with the metal member can be increased.

As a method of such metallization processing, Mo-M
Method of applying and heating n powder, thermal spraying method, plating method, CV
Various known methods such as the D method and the f'VD method can be used. Furthermore, if the surfaces of the ceramic plates to be bonded are made porous in advance, they will fit well with the insert metal, and the anchoring effect will be fully exhibited, increasing the bonding strength. Further, this porous portion acts as a stress buffer layer that buffers thermal stress. Note that a method for making the surface of the ceramic plate to be joined porous is to apply a homogeneous ceramic powder to the surface.

In the present invention, various metals or alloy members can be joined as the metal members. The material of this metal member is not limited at all. Note that if the surface of the metal member to be joined is cleaned in advance, the strength of the joint with the insert metal can be increased. Furthermore, if the surface of the metal component to be joined is made porous in the same way as the surface of the ceramic plate to be joined, not only will it fit better with the insert metal, but this porous portion will act to buffer thermal stress. Therefore, it is preferable.

As a method for making the surface to be joined of metal members porous, it is possible to irradiate the surface with a laser beam as described above, or to selectively elute substances existing along the grain boundaries and the vicinity of the grain boundaries of the metal members. Processing may be performed.

Further, in the present invention, as the insert metal, any metal member or ceramic plate to be joined can be used as long as it has a low melting point, and for example, a brazing material is suitable.

Further, when a brazing filler metal is used, the stress buffering effect can be further enhanced by using a foamed brazing filler metal that generates a large number of bubbles during melting to make the brazing metal porous. Note that such a foamed brazing material includes a brazing material containing a metal hydride. When using a brazing filler metal as the insert metal, it is best to include elements such as B, C, and P that lower the melting point of the filler metal and also cause corrosion of the bonding surface on the base metal side. During the brazing operation, the surfaces of the metal members to be joined are melted into the molten brazing filler metal, and the melting point of the brazing filler metal at the joint portion is improved. As will be described later, when the high-frequency induction heating coil 4 is operated and moved to join the ceramic plate 1 to the metal member 3, the melting point of the brazing filler metal that has melted once is raised, so that the brazing filler metal is immediately passed through the vicinity. The heating of the coil 4 does not cause it to melt again, and the bonding can be carried out extremely smoothly.

In the embodiment shown in FIG. 1, the coil 4 moves the front side of the ceramic plate 10 and sequentially bath-fuses the insert metal 2 to join them. However, this coil 4 is moved evenly over the front side of the ceramic plate 1. It is preferable to carry out scanning movement during this movement, but the present invention is not limited to this, and it is also possible to arrange a large number of coils and move them. The heating coil 4 may have various shapes other than those shown in FIGS. 1 and 2, and may have an iron core as shown in FIG. 3. In the figure, reference numeral 4' denotes a coil which is wound in a spiral shape as shown in FIG. 2, and an iron core 6 is disposed so as to be inserted through the center hole.

4A' is a lead terminal. Note that when performing high-frequency induction heating, the frequency of the high-frequency wave is not particularly limited, and a wide range of frequencies such as 300 Hz to 500 KHz can be used. Further, by changing this frequency, the depth of heating by the coil can be arbitrarily changed.

[Embodiments of the invention]

The top surface of a piston crown-shaped product (circular shape) made of Cr-Mo cast steel with a diameter of 4005 m is made of fermented zirconium-based ceramics that have been pre-metalized as a ceramic plate (
A film with a porosity of 25 cm) and a thickness of 5 tri:r) was pasted. That is, the remaining wax as insert metal (Au: 35 (TI
This insert metal was melted using a high frequency induction heating coil having a shape as shown in FIG. 2 and using a high frequency of 200 KHz. The size of the high frequency induction heating coil is 10 mm φ
It is. The high-frequency induction heating coil was moved in a spiral pattern following the circular shape of the piston crown, melting the insert metal. The moving speed is 1 cm/
It is Sec. As a result, we were able to firmly attach the ceramic plate to the piston crown.

〔Effect of the invention〕

In summary, according to the present invention, it is possible to firmly bond a ceramic plate to a metal member, and since the heated portion is small, there is little residual stress, and a large area ceramic plate can be efficiently bonded to a metal member. can. Further, there is no need to heat the metal member and the ceramic member as a whole, and the joining operation is easy and quick.

[Brief explanation of the drawing]

FIG. 1 is a #ifr plane view showing a method according to an embodiment of the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a sectional view of a high frequency induction heating coil. 1... Ceramic plate, 2... Insert metal, 3-
・・Sound wind component, 4... Peng Shu Kai Induction Heating Coil.

Claims (1)

[Scope of Claims] (1) In a method of joining metal members (=ceramic plates), an insert metal having a low melting point is interposed between the metal member and the ceramic plate for both the metal member and the ceramic plate. The ceramic plate is bonded to the metal member by applying magnetism from the front side of the ceramic plate and melting the insert metal by induction heating around the cylindrical limb, thereby joining the metal member and the ceramic plate. A method of joining plates. (2) Magnetism is applied using a high-frequency insulation heating coil, and the coil is moved to heat and melt the insert metal. (3) The method described in claim 1 or 2, characterized in that the insert metal is of a composition such that point portions of the two-metal member are soaked in water when melted. (4) Any one of claims 1 to 3, wherein the metal member and the ceramic plate are characterized in that one or both of the surfaces to be joined are made porous in advance. (5) Claims 1 to 4, characterized in that the surfaces of the ceramic plates to be joined are metallized in advance.
The method described in any one of paragraphs.