Cabot Corporation

Prabhat Kumar

Louis E Huber

Ronald D Rivers

Anthony J Hickl

Robert Engleman

Charles Heatley

James Allen Fife

Charles E Mosheim

Viren M Pathare

David A Knudson

Vidhu Anand

A method for forming a wrought product from a starting metal such as tantalum, niobium, and alloys thereof. A consumable electrode is coated with at least a first alloy layer by means which provide for uniform thickness. Sufficient power is applied to the electrode body to induce arcing to cause the starting metal and alloy layers to melt and pool in a crucible. The uniform layer on the electrode body provides a means for delivering minute quantities of alloy into a larger quantity of starting metal and facilitates a uniform and consistent arc which promotes mixing of the alloy and starting material in the crucible. The electrode body is consumed at an improved rate without an associated decrease in the final ingot yield weight. The pooled metal is allowed to solidify into an ingot. The ingot is then formed into a wrought product.

Consumable electrode method for forming micro-alloyed products

A powder of tantalum, niobium, or an alloy thereof, having an oxygen content less than about 300 ppm, and the production thereof without exposure to a temperature greater than about 0.7 T.sub.H. A powder metallurgy formed product of tantalum, niobium, or an alloy thereof, having an oxygen content less than about 300 ppm, and the production thereof without exposure to a temperature greater than about 0.7 T.sub.H.

Powders and products of tantalum, niobium and their alloys

Tantalum electrode material is produced which has extremely low tortuosity, exceptionally low ESL and ESR, potentially extended high frequency performance, very high volumetric efficiency, and reduced tantalum consumption per electrode. The electrode material is characterized by having a cross-section composed of plates of tantalum separated by spaced gaps resulting in a highly dense (volumetric efficiency) electrode. The plates are electrically interconnected which also adds to the structural stability of the article. This is made possible by being able to carefully control the geometry of the tantalum material during processing. A method for producing such material includes extruding a billet filled with a (preferentially geometrically uniform) mixture of rods of tantalum and an extrudable metal. When the billet has been sufficiently reduced in size and severed, the extrudable metal is removed by selectively dissolving with acid. In addition to the above advantages, the resulting article is particularly adapted for use in super-miniaturization applications.

Extruded capacitor electrode and method of making the same

Method of making powders and products of tantalum and niobium

A wrought metal alloy product having a tantalum or niobium base metal, 10 to 1000 ppm silicon, and 10 to 10000 ppm yttrium nitride. Fine uniform grain size contributes to improved ductility.

Tantalum base alloys

Disclosed is a coated substrate article coated with an alloy powder containing, in weight percent, 7 to 19 silicon, up to 5 copper balance nickel, cobalt and/or iron plus impurities. The articles may be coated by a variety of spray coating processes; however, plasma spray coating is preferred. The coated article is especially suited for use in severe conditions of wet corrosion.

Silicon-rich alloy coatings

A powder metallurgical process for producing a wrought product characterized by a low level of residual impurities. The process comprises the steps of: comminuting metal powder to effect a reduction in particle size, at least 60% of the comminuted particles being capable of passing through a -270 mesh Tyler screen; blending the metal powder with a softer metal-bearing powder; heating the blended powder particles at an elevated temperature, the particles adhering and forming a mass during heating; crushing the mass of powder particles; cold-isostatically pressing the crushed mass of powder; sintering the powder in the absence of an encapsulating member under conditions which effect a reduction in the nitrogen, oxygen and carbon levels of the powder; and hot working the sintered powder into a wrought product. The wrought product has less than 0.015% carbon.

Wrought P/M processing for master alloy powder

A process for producing a wrought product of improved ductility from substantially noncompactible prealloyed metal powder. The process comprises the steps of: comminuting substantially noncompactible prealloyed metal powder so as to flatten the particles thereof; heating the comminuted particles of metal powder at an elevated temperature, the particles adhering and forming a mass during heating; crushing the mass of metal powder; compacting the crushed mass of metal powder; sintering the metal powder; and hot working the metal powder into a wrought product. The wrought product has a chemistry which is substantially the same, with the exception of carbon and certain residuals, as the chemistry of the prealloyed powder.

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Allentown, PA, United States of America

Prabhat Kumar