Binary rhenium alloys

a technology of rhenium alloys and tungsten alloys, which is applied in the field of forming rheniumtungsten alloys, can solve the problems of high-purity rhenium metals that fail in such testing at the grain boundary, and achieve the effects of improving mechanical properties, reducing ductility, and improving ductility

Inactive Publication Date: 2005-10-27
RHENIUM ALLOYS
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] Rhenium-tungsten alloys formed in accordance with the methods of the invention exhibit improved mechanical properties at all temperature ranges as compared to high-purity rhenium, without exhibiting a loss in ductility. The presence of the relatively small amount of tungsten in the rhenium-tungsten alloys according to the invention appears to produce an alloy having a substantially smaller grain structure than that which is observed in high-purity rhenium metal. This smaller grain structure is believed to improve the mechanical properties of the rhenium-tungsten alloys, which also improves its processability.

Problems solved by technology

High-purity rhenium metal appears to fail in such testing at the grain boundaries.

Method used

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  • Binary rhenium alloys
  • Binary rhenium alloys
  • Binary rhenium alloys

Examples

Experimental program
Comparison scheme
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example 1

[0034] Six separate 200 gram portions of 99.9999% purity rhenium powder flakes (−200 mesh) obtained from Rhenium Alloys, Inc. of Elyria, Ohio were placed into separate beakers marked A, B, C, D, E and F, respectively. Ammonium metatungstate was dissolved in deionized distilled water and then added to the beakers labeled A, B, C, D, E and F, respectively, to provide the final concentration of tungsten shown in weight percent in Table 1 below. Additional water was added to each beaker, as necessary, to insure good wetting of the rhenium powders and good distribution of the tungsten compound throughout the powders. The contents of each beaker were stirred together until the liquid coated the powder particles uniformly. A control sample comprising the 200 grams of the same rhenium powder and distilled water (no tungsten compound was added) was placed in a beaker marked Control.

[0035] The beakers containing the wetted powders were placed on a hot plate and the volatile portion of the li...

example 2

[0041] An 0.080 inch thick sheet of a rhenium-tungsten alloy containing 1% tungsten by weight (Re1% W) was formed using the materials and procedures described in Example 1. Tensile bars were cut from the sheet in accordance with ASTM E8-03 and ASTM E21-03a. Tensile bars were tested at room temperature (70° F.), at 2500° F. and at 3500° F. FIG. 4 is a graph of the longitudinal tensile stress-strain response of the Re1% W alloy (solid line) as compared to that of high-purity rhenium metal (dashed line) at room temperature. FIG. 5 is a graph of the longitudinal tensile stress-strain response of the Re1% W alloy (solid line) as compared to that of high-purity rhenium metal (dashed line) at 2500° F. FIG. 6 is a graph of the longitudinal tensile stress-strain response of the Re1% W alloy (solid line) as compared to that of high-purity rhenium metal (dashed line) at 3500° F. As shown in the graphs, the Re1% W alloy exhibited a higher longitudinal tensile stress-strain response than high-pu...

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Abstract

Rhenium-tungsten alloys including rhenium and from about 0.025% to less than about 10% by weight tungsten. The rhenium-tungsten alloys are formed by a process that includes coating rhenium metal powders with a liquid including a tungsten compound, drying the coated rhenium powder, compressing the dried coated powder to form a compact, and then sintering the compact to form the rhenium-tungsten alloy. The rhenium-tungsten alloys according to the invention exhibit mechanical properties that are superior to high-purity rhenium metal without a loss in ductility.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of Invention [0002] The present invention relates to a process of forming rhenium-tungsten alloys that exhibit exceptional mechanical properties and rhenium-tungsten alloys formed according to the process. [0003] 2. Description of Related Art [0004] Rhenium has a very high melting point (mp 3180° C.), no known ductile to brittle transition temperature, excellent chemical resistance and high electrical resistivity over a wide temperature range. It is sold in the form of foil, sheet, plate, ribbon, wire, rod and powders for use in a variety of applications, particularly in the lighting and aerospace industry. [0005] Rhenium is derived primarily from the roasting of molybdenum concentrates generated in the copper mining industry. During the roasting of molybdenite, rhenium is oxidized and carried off in the flue gases. These gases are scrubbed to remove the rhenium, which is then recovered in solution using an ion exchange process. The rheniu...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22F1/17B22F3/12C22C1/04
CPCB22F1/025B22F2998/10C22C1/04C22C27/00B22F1/02B22F3/02B22F3/10B22F1/17B22F1/16
Inventor LEONHARDT, TODD A.GUTHMAN, CLIFFORD L.
Owner RHENIUM ALLOYS
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