Kennametal Inc.

Harold E Kelley

Charles J Terry

William E Silvis

Pankaj K Mehrotra

Harold C Newman

Arunkumar Shamrao Watwe

Gary R Peterson

Near-stoichiometric spherical tungsten carbide particles and a method for making near-stoichiometric spherical tungsten carbide particles are disclosed. The method of making these particles may comprise coating a starting powder with a carbon containing compound followed by plasma processing the starting powder in a plasma formed by known ionization techniques using a suitable fluid medium. The near-stoichiometric spherical tungsten carbide particles exhibit desirable particle uniformity, impact resistance, and wear resistance in a variety of applications.

Production of near-stoichiometric spherical tungsten carbide particles

Composite materials comprising a hard ceramic phase and an infiltration alloy are disclosed. The hard ceramic phase may comprise a carbide such as tungsten carbide and/or cast carbide. The infiltration alloy is Cu-based and comprises Ni and Sn. The infiltration alloy may further include Nb, and may be substantially free of Mn. The composite material may be heat treated in order to improve its mechanical properties. For example, the composition of the Cu&#x2014;Ni&#x2014;Sn infiltration alloy may be selected such that its hardness, wear resistance, toughness and/or transverse rupture strength are improved after the composite material is solutioned and aged at elevated temperatures.

Composite materials comprising a hard ceramic phase and a Cu-Ni-Sn alloy

A matrix powder for formation along with an infiltrant into a matrix for use as a wear element or for use in retaining at least one discrete hard element. The matrix powder including macrocrystalline tungsten carbide particles, crushed sintered cemented macrocrystalline tungsten carbide particles, tungsten carbide, and an iron-based component.

Matrix for a hard composite

A matrix powder for formation along with an infiltrant into a matrix for use as a wear element or for use in retaining at least one discrete hard element. The matrix powder includes crushed sintered cemented tungsten carbide particles. The composition of the crushed sintered cemented tungsten carbide comprises between about 6 weight percent and about 13 weight percent binder metal and between about 87 weight percent and about 94 weight percent tungsten carbide.

An arc hardfacing rod including a tubular member, a filler material, an insulating coating and a plurality of discrete metal carbide particles set within the insulating coating such that a surface of a portion of the metal carbide particles is uncovered. The filler carbide particles include tungsten carbide particles, titanium carbide particles, tantalum carbide particles, niobium carbide particles, zirconium carbide particles, vanadium carbide particles, hafnium carbide particles, molybdenum carbide particles, chromium carbide particles, silicon carbide particles and boron carbide particles, cemented composites and mixtures thereof. Adhered to the exterior surface of the tubular member is an insulating coating including a coating flux and a coating bonding agent. A plurality of discrete metal carbide particles are set within the insulating coating such that a surface of a portion of the metal carbide particles is uncovered. The metal carbide particles may be of the same composition as the filler carbide particles forming the filler material or the metal carbide particles may be macrocrystalline tungsten carbide particles, cast tungsten carbide particles, crushed sintered cemented tungsten carbide particles or pelletized cemented tungsten carbide particles, and mixtures thereof.

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Fallon, NV, United States of America

Harold E Kelley