New Technorogy

Diffusion bonding (High Technology)

Diffusion bonding is a technology to bond materials such as metal and celamic.There are two ways in diffusion bonding. They are liquid-phase and solid-phase.

Solid-phase diffusion bonding
  1. Apply pressure.
  2. Apply heat.
  3. Concavity and convexity are decreased.
  4. Bonding is completed.
Liquid-phase diffusion bonding
  1. Insert an inserting metal including element lowering fusing point into a bonding part, then apply pressure.
  2. Apply heat, then the inserting metal start to melt at a inserting part.
  3. At bonding part, isothermal clotting and diffusion will start.
  4. Bonding is completed.

For liquid-phase diffusion bonding, an inserting metal including element lowering fusing point is inserted into a bonding part. A bonding part will diffuse each other. That is a reason that diffusion bonding has more strength than wax bonding.

※1 D. S. Duvall, W. A. Owczarski and D. F. Paulonis, Welding Journal 53 (1974) 232-s
※ TANIGUCHI is able to respond to the needs of both liquid-phase and solid-phase diffusion bonding.

Products

E.g. Products to have been bonded by diffusion bonding No. 1

These were cutter-roles produced by bonding plural material.

High-grade steel (higher process cost because of its hardness) is used for the center part and law-grade steel(low process cost due to no need of hardness) to the edge. It realizes huge cost-cutting in material and processing.

※※ For this technology, METI (Advanced Industrial Science and Technology) Shikoku and Kagawa university have helped us to develop in one of a 2001 project supported by Ministry of Economy, Trade and Industry.

E.g. Products to have been bonded by diffusion bonding No. 2

It is impossible for usual processing to produce these products. Diffusion bonding is the most effective way for these materials.

Micrograph of bonding part
  Bonding of different material Bonding of same material
Liquid-phase diffusion bonding
Solid-phase diffusion bonding

Appearance of solid-phase diffusion bonding work is better, however there is not much difference in bonding strength. Liquid-phase diffusion bonding has less restriction to process such as surface roughness.

Defect evaluation by super sound flaw detector

Bonding for steels 80 mm x 60 mm. The part except dark part means a flaw which is failed to bond.

2 kinds of material has been just piled.
There seems a lot of defect.
No defect.
※TANIGUCHI finishes the process with the above condition.