JPS6021870A - Friction pressure welding method of ceramics and 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 a friction welding method when one or both of the materials are ceramics.

Conventionally, there are many research reports and practical examples regarding friction welding of metal materials. However, ceramics, which are brittle materials, have problems such as being easily cracked during chucking, easily cracking due to thermal stress, and easily cracking due to impact at the start of contact, and have not been put into practical use.

An object of the present invention is to make friction welding with high joint strength, work efficiency, and energy efficiency applicable to joining ceramic materials. In recent years, ceramics have attracted attention as a material with excellent heat resistance, corrosion resistance, and wear resistance, but it is difficult to mold irregularly shaped and large parts, and the establishment of bonding technology is awaited as a solution to these problems. Therefore, the present invention, which joins ceramics by friction welding, has great significance.

To explain the present invention based on the drawings, a pipe plate (2) made of a ductile metal is caulked to the ceramic (1) to be joined, and a disk (3) made of a ductile metal is set in front of the surface (υ) to be joined. .Here, in friction welding, the base plate must have a circular cross section, such as a round bar or pipe (ri is a round bar or pipe.

If you directly grip ceramics (1) with a chuck, it often breaks due to stress concentration, and if you reduce the gripping force to avoid cracking, it will not be able to withstand the torsion during pressure welding, and (υ will spin idly) .Ductile material metal pipes (
By caulking the second pin to (υ), the stress concentration during chucking is alleviated, making it possible to sufficiently grip (1) without destroying it.Also, metals generally have better thermal conductivity than ceramics. Therefore, (2) helps in the axial heat conduction of (1) and also serves to prevent (1) from breaking due to thermal stress. (3) reduces the impact force at the start of contact due to its ductility. This prevents (1) from cracking, softens and scatters during pressure welding, and the end face of (1) becomes the joint surface. Figure 2 shows the appearance when ceramics are joined together. Further, FIG. 3 shows a photograph obtained by cutting in a direction perpendicular to the bonding surface and observing it with an electron microscope. Next, when joining metal and ceramics, naturally (3) is unnecessary and only (2) needs to be caulked. The figure shows the state in which metal and ceramics were bonded and then polished to observe the bonding state. Note that (2) can be removed after bonding, but if left in place, it can be effectively used as a buffer against external stress.

As explained above, the present invention enables friction welding of ceramics, which are brittle materials, by utilizing the ductility and heat conduction of metals.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the sample structure, FIG. 2 is an example of joining ceramics, FIG. 3 is an electron micrograph of a joint, and FIG. 7 is an example of joining metal and ceramics. /... Ceramic round bar, 2... Metal pipe, 3...
...Metal disk Figure 1 Figure 2 Procedural amendment (method) July 7, Showa SG 1, Showa 5G patent application No. 130 B/S 2, Name of invention Ceramics and Ceramics and Metal friction welding method 3
, Relationship with the case of the person making the amendment Patent applicant 4, Designated agent address (1-5 Hirate-cho, Kita-ku, Nagoya 462)
, Date of amendment order Showa, 70/7/5g 6? , Subject of amendment: Brief explanation column of the drawings in the specification and the second part of the drawings.
Fig. 1 is a cross-sectional view of the sample IA4 Ilj structure, Fig. 2 is a longitudinal cross-sectional view of the ceramics bonded together, and Fig. 3 is the ceramic structure of the bonded portion and its surroundings. The electron micrograph shown in FIG. 7 is a longitudinal cross-sectional view of a case where metal and ceramics are joined. /... Ceramic round bar, 2... Metal pipe, 3...
...Metal disk, G...Metal round bar. 2'7 Voluntary procedure amendment Showa SG year/July 7th Showa 5g year Patent application No. 730 O/J Friction welding method of ceramics and ceramics and metals 1
11 3. Person making the amendment 4; Designated agent 8; Contents of the amendment As attached, (1) An outline of section 3 of the specification, lines 7 to 1, is shown. Further, FIG. 3 shows a photograph obtained by cutting in a direction perpendicular to the bonding surface and observing it with an electron microscope. ” will be corrected as follows. "A vertical cross-sectional view is shown. Figure 3 shows a photograph of the ceramic structure observed with an electron microscope after the ceramics were bonded together, cut in a direction perpendicular to the joint surface, and polished." (2) Same No. On page 3, lines 72-3, ``Afterwards, 1F is shown in a polished state to observe the bonded surface.'' is corrected as follows. "Shows a longitudinal cross-sectional view of the case."

Claims (1)

[Claims] A method for friction welding ceramics, ceramics, and metals, characterized in that, as a pre-process, a ductile metal (2) is caulked to a ceramic (1), and then a ductile metal (3) is set.