JPS61275171A - Ceramic joining device - 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] "Industrial application field" The present invention relates to a ceramic bonding device.

"Prior Art" Ceramics have excellent heat resistance, abrasion resistance, corrosion resistance, etc., and are therefore increasingly being used as structural materials that are used under severe conditions that metals cannot cope with.

However, in order to compensate for its shortcomings as a brittle material or its poor workability, it is bonded with metal and used as a composite material. I have a request.

Various methods for joining ceramics and metals or ceramics have been developed, including mechanical joining methods such as shrink fitting, brazing, and friction welding.

Brazing is a method in which the ceramic surface is metallized using the Mo-Mn method, etc., and then brazed with metal or ceramics that have undergone a similar treatment, but like the shrink-fitting method, structural parts other than the joint are raised. Processes are complicated, such as heating and processing in a vacuum or special atmosphere.

Compared to the above-mentioned joining methods, the friction welding method has good workability because joining can be performed in the atmosphere in a relatively short time. It is thought that the reason why bonding can be performed in the atmosphere is that the oxide is removed by friction at the bonding interface and the activated surfaces adhere to each other.

Furthermore, since friction welding generates heat locally near the joint interface, energy efficiency is high, and there is no deterioration due to heat reception outside the joint.

"Problems to be Solved by the Invention" However, friction welding is effective in joining ceramics with low-melting metals such as aluminum, magnesium, and their alloys, or in joining ceramics together via these metals. However, when joining Pe-Ni alloys, etc., the heat capacity is large, so high loads and high rotations are required, and a large stress concentration occurs in the ceramic chuck part, making friction welding difficult.

``Problems to be Solved by the Invention'' The present invention was developed as a result of intensive research in view of the above-mentioned current situation, and was developed by performing friction welding while preheating the ceramics or metals to be joined to an appropriate temperature using an external heating element such as a high-frequency coil or heater. We discovered that by doing this, it is possible to bond without causing extreme stress concentration in the ceramics.

Therefore, the present invention provides a ceramic bonding apparatus, which is characterized in that a moving heat generating source such as a high frequency coil or a heater is placed around the bonding part, and the ceramics and the metal or the ceramics are bonded together by friction welding while being heated. The purpose is to provide.

"Example" The outline of the apparatus of the present invention will be explained below with reference to FIG.

In a general-purpose friction welding machine, a chuck 1 grips a specimen 2 to be joined, a heat shielding sleeve 3 made of 5US304 covers the protrusion of the specimen 2, and a heating element 4 such as a high frequency coil or a heater is placed at the joint. After raising the temperature to an appropriate temperature, friction welding is performed.

Friction welding is characterized by being able to join in a short time, and there is a temperature difference in the joint where the outer periphery where the peripheral speed is fastest is the highest temperature, but this welding method promotes the temperature increase due to friction welding. Therefore, it is desirable to use a high-frequency coil for preheating, and the working time will not be long.

Further, since preheating by a high frequency coil generates heat only from metal, preheating by infrared irradiation is preferable for bonding ceramics or for items requiring high temperature bonding.

Furthermore, if heat generation only in the vicinity of the joint is required, it is also possible to use laser light or the like.

Oxidation of the bonding interface is thought to occur due to the temperature rising in the atmosphere, but
Since the joining interface, which is a characteristic of friction welding, is cleaned by friction and absent pressure, there is no problem, and there is no need to create a special atmosphere, so work efficiency is improved.

In addition, since only the vicinity of the joint generates heat locally and rises to the reaction temperature, deterioration and deformation of the material due to heat reception from external heating elements such as high-frequency coils and heaters other than the joint can be avoided.

Furthermore, since extreme frictional pressure and rotational speed are not required for preheating using an external heating element such as a high-frequency coil and a heater, this method is advantageous for joining ceramic materials, which are brittle materials.

[Brief explanation of drawings]

FIG. 1 is a front view of a specific embodiment of the invention.

Claims (1)

[Claims] (1) Ceramics and metals or ceramics together,
A ceramic joining device characterized by joining by friction welding using a friction welding mechanism (2) A movable heat generating source such as a high frequency coil and a heater is arranged around the joint part and heats it to facilitate joining. A device for joining ceramics according to claim 1 (3) The ceramic is an oxide or a non-oxide. (4) A device for joining ceramics according to claim 1 (4) The metal has a melting point of 1000°C. The apparatus for joining ceramics according to claim 1, which is the above