 Pressure accumulator |
| Having thus described the invention and illustrated its use, what is claimed as new and is desired ... |
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| Storage tank with liquid insulator for storing cryogenic fluids using water displacement |
| According to the present invention there is provided a novel improved system for storing a ... |
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| Volatile liquid storage system |
| According to one aspect of the invention, a volatile liquid storage and emissions control apparatus ... |
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| Fluid seal apparatus |
| To this end, the piston in the apparatus of the invention has a cavity opening out into the first ... |
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| Process and an arrangement for producing a supporting body for a catalytic reactor |
| The invention relates to a process and an arrangement for producing a supporting body for a ... |
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| Resistance adjusting type heater and catalytic converter |
| Accordingly, an object of the present invention is to provide a resistance adjusting type heater ... |
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| Catalytic converter with metallic carrier and method for producing same |
| It is an object of the present invention to provide an improved catalytic converter including a ... |
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| Core for an electrically heatable catalytic converter |
| OF THE INVENTION As indicated above, the present invention is a novel arrangement and structure ... |
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| Catalytic converter with electrically resistive catalyst support |
| It is therefore an object of the present invention to provide a catalyst support which has a ... |
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| Heated cellular structures |
| According to the practice of this invention, a honeycomb structure or body of electrically ... |
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Nickel-chromium-silicon alloy brazing foil
| Details |
Inventors: D'Silva, Thomas L.;
Assignee: Western Gold and Platinum Company (Belmont, CA)
Primary Examiner: Dean; R.
Assistant Examiner:
Attorney, Agent or Firm: Castle; Donald R.
Nickel-Chromium-Silicon alloys of the nominal composition, Ni.sub.(45-78) Cr.sub.(16-34) Si.sub.(6-21) in the form of thin foil are made ductile by the presence of appreciable amounts of an amorphous phase and a metastable, solid solution, microcrystalline single phase and are especially suitable for preplacement as preforms in a joining operation such as brazing. Up to abour 40 atomic percent of the nickel is replaceable with palladium. |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS For a better understanding of the present invention, together with the other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims in connection with the above description of some of the aspects of the invention.
U.
S.
Pat.
No.
3,856,513 claims that additions of silicon aid in the formation of the amorphous phase.
However, the sole purpose of additions of silicon to the alloy of this invention is for its effect of depressing the melting range, as commonly used in nickel-base brazing alloys.
Up to 40 atomic percent of the nickel is replaceable with palladium to depress the melting range further than that provided by silicon.
In the nickel-chromium-silicon system, alloys of a silicon content greater than about 6 atomic percent form nickel and chromium silicides which embrittle the alloy and do not allow for fabricating into thin foil by conventional casting and rolling techniques.
The formation of silicides is well documented in the description of the Ni-Cr-Si ternary system as described by Knotek, Lugscheider and Eschnauer in Hartlegierungen Zum Verschleiss--Schutz, P.
30, Verlag Stahleisen MBH, Dusseldorf, 1975.
It is known that rapid cooling of a molten metal will in some instances form amorphous materials instead of crystalline phases.
Some techniques for rapid quenching are disclosed in U.
S.
Pat.
Nos.
3,896,203; 3,863,700; 3,881,540 and 3,881,541.
In the practice of this invention it is preferred to use a metal stream from an orifice to impinge upon a rotating drum having its external surfaces cooled by an internal cooling medium such as water.
The metal stream upon solidifying forms a sheet-like material that is projected from the drum by centrifugal force.
Depending on the cooling rate during the rapid quenching, the resulting structure consists of a combination of an amorphous phase, new phases not obtainable under equilibrium conditions and a solid solution with solubility limits extended beyond their equilibrium values as described by Pol Duwez, R
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Metal Working 
