Stock material or miscellaneous articles – All metal or with adjacent metals – Foil or filament smaller than 6 mils
Patent
1998-01-30
1999-07-06
Yee, Deborah
Stock material or miscellaneous articles
All metal or with adjacent metals
Foil or filament smaller than 6 mils
148403, 148330, 148325, 420 64, 420 42, 420 87, 420121, C22C 3802, C22C 3832, C22C 3854
Patent
active
059195770
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an Fe-based alloy foil for liquid phase diffusion bonding, of Fe-based materials including various grades of steel products such as steel plates, steel pipes, steel bars (including steel wires and steel reinforcements), in which the bonding can be performed in oxidizing atmospheres at low temperatures in a short time with no heat effect on the materials to be bonded (base materials).
The present invention also relates to an Fe-based alloy foil for liquid phase diffusion bonding of Fe-based materials, including various grades of steel products such as steel plates, steel pipes, steel bars (including steel wires and steel reinforcements), in which the bonding can be performed in oxidizing atmosphere in a short time to provide a bonded joint having good strength.
The present invention relates to an Fe-based alloy foil for liquid phase diffusion bonding of Fe-based materials, including various grades of steel products such as steel plates, steel pipes, steel bars (including steel wires and steel reinforcements), in which the bonding can be performed in oxidizing atmospheres at low temperatures in a short time with no heat effect to the materials to be bonded (base materials).
BACKGROUND ART
The liquid phase diffusion bonding process bonds base materials by inserting therebetween an alloy in the form of a foil, a powder, a plated layer, etc. of a eutectic composition having a melting point lower than that of the base materials, pressing the base materials together, and heating the bonding portion to a temperature immediately above the solidus line of the inserted alloy (hereinafter referred to as an "insert metal") to cause melting and isothermal solidification; the process is considered as one type of solid phase bonding process. The isothermal solidification occurs because a specific element diffuses from a liquid phase to a material to be bonded (a base material), and thereby, the chemical composition of the liquid phase is shifted so that the solidus line of the shifted composition reaches the heating temperature.
The liquid phase diffusion bonding can be effected at relatively low pressing forces and is therefore not only used to avoid occurrence of a residual stress and a deformation due to bonding but is also applied to the bonding of high alloy steels and heat resistant steels which are difficult to bond and to the bonding of these steels with carbon steels.
On the other hand, carbon steels or steels for general use are conventionally bonded by other various bonding methods and the liquid phase diffusion bonding is rarely used.
The liquid phase diffusion bonding is frequently used to bond materials containing 0.50% in atomic percentage of Cr as an alloying element.
The Cr-containing material is characterized by having a dense coating film of a Cr oxide (mostly Cr.sub.2 O.sub.3) to provide high resistance to oxidation and corrosion.
Thus, it is naturally recognized that heating upon bonding also causes an oxide film to form on the bonding surfaces to impede leakage of a molten insert metal therethrough, and thereby, diffusion of atoms necessary for the bonding is significantly hampered to render it difficult to provide good bonded joints.
Thus, the conventional art such as Japanese Unexamined Patent Publications (Kokai) No. 53-81458, No. 62-34685, and No. 62-227595 necessarily use a vacuum or inert or reducing atmosphere during liquid phase diffusion bonding, which caused a significant increase in the bonding cost.
The present applicant has conducted various studies to achieve liquid phase diffusion bonding of stainless steels, high nickel-based alloys, and heat-resisting alloy steels and bonding between any of these materials and carbon steels in such a manner that the liquid phase diffusion bonding can be effected even in air, in which an oxide coating film is formed on the base material, to provide good bond joint quickly with a reduced cost and found that the use of an insert metal containing 0.1 to 20.0 at % V and an increased amount of Si enables
REFERENCES:
patent: 5683822 (1997-11-01), Hasegawa et al.
patent: 5759300 (1998-06-01), Hasegawa et al.
Hasegawa Yasushi
Ozaki Shigekatsu
Sato Yuichi
Tsuru Eiji
Nippon Steel Corporation
Yee Deborah
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