Stock material or miscellaneous articles – Composite – Of metal
Patent
1993-11-30
1997-10-21
Speer, Timothy
Stock material or miscellaneous articles
Composite
Of metal
428472, 428621, 428622, 428629, 428630, 428631, 428633, 427190, 427193, 427201, 228119, 228198, 2282343, B32B 900
Patent
active
056794649
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for joining heat-resisting alloys and more particularly to a method for joining heat-resisting alloys required to satisfy very strict high-temperature strength, heat-cycle resistance and electrical insulation requirements, for example, in the form of metallic carriers for use in the purification of an automobile exhaust gas in a high-temperature environment with a temperature of 800.degree. C. or above and in a heat-cycle environment.
BACKGROUND ART
Methods including the use of various organic adhesives or inorganic adhesives, brazing, welding, etc. are generally known as methods for joining heat-resisting alloys in a sheet or foil form to each other.
On the other hand, as disclosed in, for example, Japanese Unexamined Patent Publication (Kokai) Nos. 2-97686, 2-97687, 1-141834, 63-312985 and 63-203779, an enamel coating technique where an oxide layer is formed on the surface of a metal to electrically insulate the surface of the metal from the metallic substrate is also known.
In joining by the brazing and welding, however, it is impossible to make the joint electrically insulating.
If the object is to attain electrical insulation alone, use may be made of, for example, a method which comprises interposing an electrically insulating material between the heat-resisting alloys and joining the insulating material and the heat-resisting alloys to each other with an organic adhesive. Further, direct joining of heat-resisting alloys to each other with an organic adhesive by taking advantage of the electrical insulating property of the organic adhesive can also be considered. In both methods, however, since the organic adhesive has poor heat resistance, it is unsuitable for use in the high-temperature environment contemplated in the present invention.
A method which comprises interposing an insulating material between the heat-resisting alloy foils and joining the insulating material and the heat-resisting alloy foils to each other with an inorganic adhesive or a method which comprises directly joining heat-resisting alloys to each other with an inorganic adhesive by taking advantage of the electrical-insulating property of the inorganic adhesive can provide heat-resistance in the joint. In these methods, however, when the joined product is subjected to heat-cycling, cracking occurs within the adhesive, which finally results in fractures, so that the problem of heat-cycle resistance cannot be solved. That is, the object of the present invention could not be attained also by the methods using an organic or inorganic adhesive.
On the other hand, the above-described enamel coating technique is based on a technical idea for attaining electrical insulating properties and heat-cycle resistance. Since, however, this technique is basically related to a metallic surface treatment, the technique, as such, cannot be applied to the present invention directed to joining of metals to each other.
An object of the present invention is to provide a method for joining heat-resisting alloys in a sheet or foil form, wherein the resultant joint can simultaneously satisfy four property requirement in an environment in which a metallic carrier is used in the purification of an automobile exhaust gas. The properties are, a high-temperature strength sufficient to withstand a temperature of 800.degree. C., a heat-cycle resistance sufficint to withstand a repeated heat-cycle from room temperature to 800.degree. C., a sufficint-joining strength at room temperature, and electrical insulation between the heat-resisting alloys.
CONSTRUCTION OF INVENTION
In the present invention, in order to attain the above-described object, oxides of at least two elements selected from the group consisting of the group Ia elements, group IIa elements, group IIIa elements, group IVa elements, group Va elements, group VIa elements, group VIIa elements, group VIII elements excluding Rh, Pd, Ir and Pt, group Ib elements excluding Ag and Au, group IIb elements excluding Hg, group IIIb elements, group
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Stahlschussel, 1983, pp. 260, 324.
By the edition committee of fine ceramics molding-working and bonding technology "fine ceramics molding-working and bonding technology", Jan. 10, 1989.
Konya Shogo
Okamoto Akira
Nippon Steel Corporation
Speer Timothy
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