JPS61192550A - Ceramics metallic joining body - 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 Field of Application] The present invention relates to a ceramic-metal bonded body that does not easily generate thermal stress even when used at high temperatures.

[Conventional technology]

In recent years, industrial ceramics have made remarkable progress, and the scope of their use is rapidly expanding. especially.

BACKGROUND ART Taking advantage of the heat insulation and heat resistance properties of ceramics, methods of substituting some metals with ceramics are becoming popular.

[Problems to be Solved by the Invention] In this case, the method of attaching the ceramic and metal is extremely difficult, and generally welding or brazing is used.

Methods such as shrink-fitting or adhesion that completely fix the two parts do not cause any problems if the parts are used at room temperature, but due to the characteristics of ceramics, they are often used at high temperatures, so this In some cases, with the above construction method, due to thermal stress caused by the difference in thermal expansion between the two during use,
Joints may easily come apart or ceramics may crack.

Therefore, one way to prevent the occurrence of this thermal stress is to use ceramics and metals.

It is desirable to use a mounting method that allows each to expand and contract independently and freely.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and is suitable for use at high temperatures.

An object of the present invention is to provide a ceramic-metal bonded body that can strongly hold a bonded part while preventing the occurrence of thermal stress on the bonded surfaces of ceramics.

[Failure to solve the problem]

The present invention provides a metal member, a ceramic member having a locking hole that contacts the metal member and penetrates the contact surface, a locking portion that is fitted into the locking hole and locks the ceramic member, and the metal member. The gist of the present invention is a ceramic-metal bonded body comprising a locking metal rod having an end portion welded to a member.

[Effect]

Therefore, the present invention does not directly fix the contact surfaces between the metal member and the ceramic member, but instead absorbs the displacement between the two members due to thermal expansion into the gap between the locking hole and the locking metal rod. The ceramic member is fixed to the metal member by the locking portion of the locking metal rod welded to the metal member while preventing the generation of stress.

Further, in the second aspect of the present invention, a locking metal rod is inserted into a locking hole of a ceramic member, and one end of the locking metal rod is inserted into a locking hole of a ceramic member.

By energizing the metal member, the locking metal rod and the metal member can be resistance welded, which facilitates the actual work of fixing the metal member and the ceramic member.

〔Example〕

Two embodiments of the present invention will be described below with reference to two drawings. FIG. 2 is a partially cutaway view showing a ceramic plate as a ceramic member attached to a metal member. A locking hole 1a is formed in the ceramic plate 1 and has a shape in which a bolt as a locking metal rod can be inserted into the ceramic plate 1. Depending on the conditions of use, one or more locking holes 1a may be provided as necessary. Further, the locking holes 1a may be processed after firing, but preferably before firing (from powder compaction to pre-firing).

FIG. 3 shows the shape of a metal bolt 2 as a locking metal rod inserted into the locking hole 1a of the ceramic plate 1 shown in FIG. This bolt 2 is machined so that it can be reliably inserted into the locking hole 1a machined in the ceramic plate 1, and the bolt 2 is
The tip 2a of the ceramic plate is processed into a shape that slightly protrudes from one surface of the ceramic plate.

FIG. 4 shows a method for attaching the ceramic plate 1 to the metal member 3 using bolts 2.

After the ceramic plate 1 and metal member 3 are stacked.

A bolt 2 is inserted into a locking hole 1a formed in a ceramic plate 1, an electrode 4 is brought into contact with the upper part of the bolt 2, and electricity is applied between the bolt 2 and the metal member 3 from a power source 5 via the electrode 4.
A contact portion 2a between the two.

3a is resistance heated and welded. What is the capacity of power supply 5?

It can be changed depending on the size of the bolt 2.

FIG. 1 shows two embodiments according to the invention after joining.

FIG. 1 (A') shows a ceramic plate 1 attached to a metal member 3,
It is fixed by joining a metal bolt 2 and a metal member 3, and the top of the bolt 2 is open.

In this example, since a part of the surface of the ceramic plate 1 is made up of metal bolts 2, the bolts 2 will be damaged in an environment where heat resistance and wear resistance are required. However, it is effective as a countermeasure against sliding wear.

On the other hand, FIG. 1(B) shows another embodiment for eliminating the defects of the above-mentioned embodiment. In this embodiment, a ceramic plate 1 is made of metal in the same manner as in the embodiment of FIG. 1(A). After attaching to the member 3, a disk-shaped ceramic 6 having the same properties as the ceramic plate 1 is inserted above the bolt 2, and the side surface of the ceramic plate 1 and the side surface of the disk-shaped ceramic 6 are processed in advance. The groove 7a is fitted with a snap ring 7b.

In the above embodiment, a metal bolt with a step is used as the locking metal rod, but a metal locking rod in the shape of an inverted truncated cone without two steps may also be used, as long as it can be locked. It's not about the shape.

[Effects of the Invention] In view of the above, the present invention is advantageous because there is a slight gap between the locking metal rod and the locking hole provided in the ceramic member, and the bonding surface between the ceramic member and the metal member is not fixed. There is no thermal stress when used at high temperatures and no stress during installation. Therefore, the occurrence of cracking in two can also be prevented. Moreover, the installation time is short and simple, and it is extremely effective industrially.

Therefore, the present invention is a burner part for a coal-fired power plant.

It can be applied to parts that require heat resistance, wear resistance, heat insulation, etc., such as diesel parts, and has great effects.

[Brief explanation of drawings]

FIG. 1 shows two embodiments (A) and 2 (A) of the present invention.
FIG. 2 is a partially cutaway perspective view of a ceramic plate 1 having a locking hole 1a as a specific example of a ceramic member, and FIG. 3 is a cross-sectional view of a ceramic-metal bonded body according to B). A sectional view of the bolt 2 as a specific example, FIG.
FIG. 3 is an explanatory diagram illustrating a bonding situation in this example. ■... Ceramic plate, 2... Bolt, 3... Metal member.

Claims (1)

[Claims] A metal member, a ceramic member having a locking hole that contacts the metal member and penetrates the contact surface, a locking portion that is fitted into the locking hole and locks the ceramic member, and welded to the metal member. A ceramic-metal bonded body comprising a locking metal rod having an end that is connected to the metal rod.