JPS5926984A - Metallizing melt adhesion of ceramics and metal - 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 The present invention relates to metallizing welding of ceramics and metals.

Conventionally, when metallizing welding a ceramic plate such as a ceramic heater to a metal plate or metal container, Mo-Mn was applied to the welding surface of the ceramic, such as alumina porcelain.
A metal layer is formed by metallizing using a method, a copper sulfide-silver carbonate method, a metal solder method, a copper oxide method, etc., and this metal layer and a metal such as a metal container are bonded by silver brazing, etc.
However, during brazing, it is difficult to prevent cracks in ceramics due to the difference in thermal expansion coefficient between metals such as metal plates and metal containers and ceramics.
In particular, when the shape of the metal such as a metal plate or a metal container becomes large or the thickness becomes thick, this tendency is even more severe, and welding is extremely difficult.

This application was developed to prevent cracking due to the difference in thermal expansion between ceramics and metals during metallizing welding, and as shown in Figure 1, the Mo-Mn method or the Metal layer 2 is formed using the copper sulfide-silver carbonate method, metal solder method, copper oxide method, etc.
A porous metal body 3 such as nickel or copper is interposed between the metal layer 2 and a metal 4 such as a metal plate or a metal container, and the metal layer 2 and the porous metal body 3 are bonded together using silver solder or the like. Also, the metal 4 is soldered in a sandwich shape.
J5 will be integrated.

In this case, brazing can be easily achieved by interposing a brazing material such as silver solder on both sides of the bottom of the metal porous body 3 using 7lux in combination, and heating. In addition to silver solder, solder or the like may be used as the brazing material depending on the conditions of use. In this way, the metal porous body 3 is interposed between the ceramic (and the metal 4) and the stress due to the thermal expansion difference between the ceramic (1) and the gold fi4 is absorbed by the metal porous body 3 (11M). Therefore, metallizing welding between the ceramic 1 and the metal 4 can be performed without causing cracks in the ceramic 1.

1. Even when the ceramic 1 welded to the metal 4 by the metallizing welding method of the present invention is used in a high-temperature heat cycle environment, the metal porous body 3 absorbs the thermal stress applied to the ceramic 1. , no abnormalities such as cracks will occur.

For this reason, if ceramics are welded by the metallizing welding method of the present invention to prevent wear on the inner surface of pipes when transporting powder and granular slurry, and to resist gas corrosion and wear on the inner surface of coke dust collector ducts, etc. The welding is stronger than conventional adhesives such as resin adhesives, and the ceramics do not peel off even during heat cycles during use, and unlike resin adhesives, it can also be used in high-temperature dust collection ducts. It has the characteristics of being resistant to metallizing welding and operating conditions up to several hundred degrees.

Place a ceramic heater, etc. in a metal container, etc.

By welding using this metallizing welding method, cracking of the ceramic heater due to the difference in thermal expansion between the ceramic heater and the metal container can be prevented.

It also applies to ceramic heaters under heat cycle usage conditions. Thermal strain is absorbed by the metal porous body, which prevents the 4rl stress on the ceramic heater.
Since the ceramic heater is directly metallized and welded to the metal container, it has many excellent features such as excellent thermal conductivity that cannot be achieved with resin bonding or the like.

[Brief explanation of the drawing]

The drawing is a sectional view for explaining the present invention. I is a ceramic, 2 is a metal layer by metallization, 3 is a metal porous body, 4 is a metal, and 5 is a wax example. Yasumi Kawamoto, Representative of Kawaso Denzai Kogyo Co., Ltd. Drawings

Claims (1)

[Claims] In metallizing welding of ceramics and metals,
A ceramic characterized in that a metal porous body is interposed between the metallized surface of the ceramic and the metal, so that the brazing is integrated and the generation of cracks in the ceramic due to the difference in thermal expansion coefficient between the ceramic and the metal is prevented. Metal metallizing welding method.