JPS59110484A - Joining method of al sintered members - Google Patents

Abstract

PURPOSE:To join metallurgically and securely Al sintered members by pressing, holding and sintering the mutual joint surfaces of Al green compact members, Al calcined body members, etc. via a joint layer material constituted of powder contg. Cu, Sn, Zn, etc. CONSTITUTION:The mutual joint surfaces of an Al green compact member and an Al green compact member, an Al calcined body member and an Al calcined body member or an Al green compact member and an Al calcined body member are pressed and held to each other via a joint layer material consisting of powder, green compact or calcined body constituted of >=1 kind among Cu powder, Cu alloy powder, Sn powder, Sn alloy powder, Zn powder and Zn alloy powder, and the above-mentioned two members are sintered in this state, whereby the eutectic of the liquid phase is formed at a low temp. by the diffusion and reaction of the above-mentioned components for accelerating joining such as Cu with the joint surfaces of the above-mentioned members in the stage of sintering and the resulted Al sintered members are metallurgically and securely joined.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for metallurgically firmly joining an AA-based sintered member and an An-based sintered member.

Conventionally, in general, when joining an AP type sintered member and an Ac type sintered member, there is a method using (Al adhesive).

(bl　Mechanical joining method, (C) Method by brazing, Methods such as these are used.

However, in method (a) above, since pores exist on the surface and inside of the AP and sintered member, the contact area at the mutual bonding surfaces becomes relatively small, and the applied adhesive Since it is absorbed into the pores, the bonding strength is relatively low and the bonding strength tends to vary.Furthermore, since the adhesive is organic, the heat resistance of the bonding surface is poor. In addition, in the above (b1 method), since screws are usually used, it is necessary to drill holes in the sintered member, and as a result, the strength of the sintered member is inevitably reduced. The need to increase the thickness of the entire connecting member leads to increased costs, design constraints, and more complicated work.Furthermore, in method (C), the work is complicated. In addition, there are problems such as insufficient diffusion of the brazing filler metal and failure to obtain satisfactory bonding strength.

Therefore, from the above-mentioned viewpoint, the present inventors have solved the problems of the conventional bonding method described above using A1! As a result of conducting research to develop a joining method for sintered parts, we found that the following methods were used to join parts before sintering: Cu powder, Cu alloy powder, Sn powder, Sn alloy powder, Zn powder7 and One or more Zn alloy powders (hereinafter referred to as main components in these powders, namely Cu, S
When the members to be bonded are sintered in this state, a bonding layer material consisting of a powder, green compact, or temporary sintered body composed of powder, green compact, or temporary sintered body composed of n7 and Zn (collectively referred to as a bonding promoting component) is sintered. During sintering, the bonding promoting component diffuses and reacts with the bonding surface of the member to form a eutectic at a low temperature, and part of this eutectic becomes a liquid phase, so the resulting Ac-based sintered member is They obtained the knowledge that the bond is extremely strong and has an extremely high bond strength.

The present invention has been made based on the above findings, and includes an AQ-based positive compacted powder member, an Ae-based compacted powder member, a 1M-based pre-sintered compact member, an M-based green compact member, or an M-based compacted powder member. The mutual bonding surface of the member and the Aε-based pre-sintered body member is coated with a bonding promoting component, or a Cu powder mainly containing this, a Cu alloy powder, or S.
n powder, Sn alloy powder, Zn powder.

and Zn alloy powder, the two members are held in contact with each other through a bonding layer material consisting of a powder, a green compact 9 or a temporary sintered body, and in this state, both members are sintered. At the same time, it is characterized by metallurgical bonding.

Next, the joining method of the present invention will be specifically explained using examples.

Example M powder with a particle size of -200 mesh was used as the raw material powder.

Same 100 mesh flaky graphite powder, same 100
m6sh PB powder, same 60mesh 5102 powder, same 150mesh Cu powder, same 15Q mes
h Zn powder.

Same 100 mesh Sn powder, same 100 mesh CU-P alloy (P: 12% content) powder, same 100 mesh
sh Cu-Sn alloy (Sn: 10% content) powder, same 100 mesh Cu-Mg alloy (Mg: 20% content) powder, same 100 mesh Cu-5n-Fe alloy (Sn: 20%, Fe: 15 %) powder, same 200
mesh AP, -Cu-8i-Mg alloy (Cu:
2%, Si: 15%, Mg: 5%) powder, same 1. OOmesh Si powder, same 10
Omesh's Ivig powder, and the same 15 Ome
Cu-AQ-P alloy (M: 10%, P: 1
2% containing) powder was prepared, these raw material powders were blended into the composition shown in Table 1, and after mixing for 30 minutes in a V-type mixer, the width of both parts to be joined was 12. For the green compact with dimensions of 4' x length: 4'Ow++ x thickness: 5 u, part of the bonding layer material is left as powder, and the rest is width: 12 w x length:
3 to 6 tons, on/crt, to a powder compact having a planar dimension of 40 mm and a thickness shown in Table 1.
The powder compacts are molded at a predetermined pressure within the range of t, and a part of these green compacts is further held at a predetermined temperature within the range of 200 to 450°C for 60 minutes in a hydrogen atmosphere to form a temporary sintered body. Then, the resulting AX-based green compact member, AQ-based pre-sintered compact member, powder bonding layer material, green compact bonding layer material, and pre-sintered compact bonding layer material are shown in Table 1, respectively. In this combination, the bonding layer materials were placed in between and sintered and bonded in this state under the conditions shown in Table 1, thereby carrying out the bonding methods 1-23 of the present invention, respectively.

The shear strength at the joint of the resulting AE-based sintered member was measured and shown in Table 1. Table 1 also shows, for comparison purposes, the shear strength of the joints when AQ-based sintered members having the compositions shown in Table 1 were joined using commercially available organic adhesives.

From the results shown in Table 1, the M-based sintered members joined by the present invention joining methods 1 to 23 were all superior to those joined by the conventional joining method using adhesive. It is clear that the bonding strength is high.

As described above, according to the joining method of the present invention, AQ-based sintered members can be firmly joined together metallurgically at the same time as the two members are sintered, and the resulting joining strength between the two members is non-uniform. This brings about industrially useful effects such as no oxidation.

Applicant: Mitsubishi Metals Corporation

Claims (1)

[Claims] Heg, the mutual joint surfaces of the green compact member and the green compact member, the AAAc based sintered member, the AQ based green compact member, or the AQ based positive press powder member and the M green compact member are bonded with CU powder. Cu
Alloy powder, Sn powder, Sn alloy powder, Zn powder,
and Zn alloy powder, and are held in contact with each other through a bonding layer material made of powder, green compact, or temporary sintered body, and in this state, both members are sintered. A method for joining Ac-based sintered members, characterized by metallurgically joining them at the same time as solidifying them.