JPS5864283A - Method of bonding 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 method for joining ceramics and metal.

In recent years, ceramics have been used in various directions due to their heat resistance, and are often used in combination with metals.

However, although ceramic members and metal members can be joined by S-welding, there is a considerable difference in the thermal properties of the two (ceramics and metal), specifically, the coefficient of thermal expansion and thermal conductivity. For example, when used at high temperatures or under conditions of rapid heating and rapid cooling 1
Secondly, the bonding properties of the bonded product made of the two deteriorated, and the durability was unsatisfactory.

The object of the present invention is to provide a method for joining metals.

The bonding method of the present invention uses aluminum titanate (AI,
Ti0- and silicified Pude: / (Mo3i, ) obtained by adding and mixing one or more of the powders 1 and 2I with an organic binder according to the membership fee C2. A paste-like adhesive is applied to the surfaces of the ceramics to be bonded, and reduced in air at 1500°C.
The method is characterized in that after heat treatment is performed at a temperature of sO to 500 minutes, a metal is bonded to the surface of the obtained adhesive layer by welding or the like.

That is, the part of the ceramic member to be joined with the metal fs material - 2. An adhesive layer having intermediate thermal properties between ceramics and metal is formed, and then a normal joining means such as welding is applied on the obtained adhesive layer. .

Soldering, brazing, etc.g: It is characterized by joining metal parts.

A cross section of the ceramic-metal bond obtained in this way
The figure shows it schematically. In the figure, 1 is a ceramic member, 2 is a metal member, 5 is an adhesive layer according to the present invention, and 4 is a bonding layer such as a welding layer. More specifically, an impregnated eutectic layer 1a made of ceramics, Mo810m, Al, and Ti0i is formed in the shallowest direction of the ceramic member 1, and this impregnated eutectic layer tll mainly consists of Mo31m, AI, and 'rio. Glue eyebrow ink is formed. That is, between the ceramic member 1 and the metal member 2, a layer having intermediate characteristics of 1 and 1.2, specifically, an adhesive layer 5 is formed,
Also, between the adhesive layer 5 and the ceramic layer 1, there is an intermediate value of 1 and 1.5. Layers with different characteristics exist in stages.

The method according to the invention is used twice for ceramics made of silicon dinitride (SimN).

The fine powder adhesive is made into a paste because it makes a loud noise when applied, but organic binders used in the process include ethylene glycol, polyvinyl alcohol, or paraffin. . The organic binder is not necessarily required, and the adhesive may be used as a powder, or may be made into a paste using an organic solvent in water. The reason why the heating after coating was limited to the conditions described above is to form an impregnated eutectic layer at the shallowest depth iii of the ceramic member. Note that the reducing atmosphere is preferably water-steam or water vapor.

Hereinafter, the present invention will be explained in detail according to examples.

Example 1 Mums 1.
TIQ, 203 f, MoSi, 170 t,
M.

A small amount of water is added to a mixture of 81t, Mu 1111F and 'i'i 23F using an ethylene glycol bat to form a paste. The obtained paste-like product was applied to the SS lN4 II caking metal joint as a ceramic S#, and heated for 2 hours in a Hz H*0 atmosphere.
Heat at a temperature of 000° C. for 5 hours. As a result, the ceramic member 1 and adhesive layer 3 having the above-mentioned cut-box structure (see Figure II) were obtained.

Next, a metal Al material was bonded to the surface of the adhesive layer 3 by iron welding to obtain a bonded product (Net).

Example 2 As a ceramic member, Bi, N, *5 tat II instead of solid body! A bonded product (No. 2i) was obtained in the same manner as in Example 1'11, except that

Example 5 As a metal member, a bonded product (No.
5) was obtained.

Example 4 Mu1. A bonded product (No. 4m) was prepared in the same manner as in Example 1 except that 〒it or 1&&I was used alone.

4b, 4g) was obtained.

Example 5 The same as in Example 1 was used except that bobbinyl alcohol or Nosa was used as the organic binder instead of ethylene glycol.
b) *obtained.

Example 6 A bonded product (No. 6) was prepared in the same manner as in Example 1 except that the atmosphere was changed to a steam atmosphere among the heating Jl & field conditions.
I got it.

Example 7 Among the heating conditions, the heating temperature was 1500°C.

Example 1 and F except for adopting 2500°C and 3000°C
The li is 31m, and the joints (No. 7m, 7b, 7
c) Got f.

Example a A bonded product (No. 8a, ah, Bc) was obtained in the same manner as in Detailed Example 1, except that among the heating conditions, the holding time was 50 minutes, 1 hour, or 8 hours.

Example! As a joining method, welding (g) and brazing or soldering (f'!) Do the same as it and get the joint (No. 9m, ?b) 1.

For each of the thus obtained bonded products, a high temperature strength test and b) a high temperature and low temperature cycle stiffness test were conducted in order to examine the heat resistance, particularly the heat resistance at the joint. In this case, for the former &), after holding at 1400℃ for 50 hours, and for the latter b), after holding at 1408℃
After repeating 5 times of holding at 40° C. for 1 hour, the tensile strength was measured and evaluated.

The fruit set is shown in Table C= below. In addition, the control conjugate (vs. j
As f11), a bonded product obtained using a ceramic member that was not subjected to surface treatment was used, and the results also appeared in the table.

From the table above, it can be seen that all the bonded products obtained by the method of the present invention were as compared to the conventional bonded product (Control 1);
Excellent results have been shown in both tests.

In addition, in the examples, as the ceramic member, g
Although examples have been shown in which silicon-containing materials such as iN, .
It can also be applied to iB. Also, as a metal member, F.
, Although only At alloys are shown, other Fe alloys and other metals, such as C%1°Ni, MuLZm, Cd
, Ti, Cr, Ag, Au or 'mpt or alloys thereof (= were also effective.

As described above, according to the bonding method of the present invention, the surfaces of metal and ceramic can be modified to form a layer having thermal properties intermediate between those of ceramic and metal. Since the significant difference in thermal properties between ceramic and metal can be absorbed by the layer, a bonded product with excellent heat resistance can be obtained, and reliability can be improved. Specifically, #In is effective in high-temperature use and in rapid heating and/or rapid cooling. Also,
Finally, since the ceramic and metal are joined by common joining means such as connection, it can be applied to a wide range of metals. Further, the adhesive according to the present invention can be uniformly and quickly applied to ceramics to be surface-treated by adding an organic binder or the like to form a paste.

1i191 Peng is a simple cross-sectional view showing the vicinity of the joint of the bonded product obtained according to the present invention.

1...Ceramics member 2...Metal II# 5... Adhesive steel layer 4...Joining layer

Claims (1)

[Claims] Tis? Call and M.O.
A paste-like adhesive obtained by mixing an organic binder as necessary with a mixed powder made by adding one or more types of H4 is applied to the surfaces of the ceramics to be bonded, and the paste is applied in a reducing atmosphere. At a temperature of 1° below 50°C
A method for joining ceramics and metal, characterized in that after heating for 500 minutes, the surface of the obtained adhesive layer is joined by metal kfII contact.