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AssigneeAlloys, Incorporated
InventorThomas J. Smith
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A mining or drilling tool which has a region subject to excessive wear is hardfaced on such region with sintered chromium carbide particles metallurgically bonded on the tool by a steel matrix which is alloyed with the particles at the interfaces therebetween. The particles are in a size range of 10 to 60 mesh and are present in an amount for effective abrasion resistance. The particles are comprised of grains of chromium carbide having an average size in the range of 0.5 to 25 microns disposed in a binder comprising a major portion of nickel. Minor portions of grain growth inhibitors, particularly, tinanium carbide and molybdenum carbide, are preferably components of the carbide particles so as to inhibit growth of the chromium carbide grains to be such that such grains have an average size in the range of 0.5 to 15 microns. The particles are preferably coated, prior to being applied as the hardfacing, with one or more materials such as ferrosilicon, ferromanganese, ferromolybdenum, nichrome and others identified below, to limit the alloying of the particle per se with a steel matrix, to improve the matrix, and to improve the welding characteristics of the hardfacing materials. There is also provided material comprising discrete particles as above described which are useful in forming the hardfacing material on the tool.
A tool for use in the penetration of earthen formations wherein the tool has at least one region of steel subject to excessive wear, said tool having an improved hardfacing on such region of sintered chromium carbide particles metallurgically bonded to the tool by a matrix consisting essentially of the underlying steel of said tool alloyed with the particles at the interfaces therebetween, with the interfaces being free from any brittle intermetallic compound such as would interfere with the alloy bond between the particles and matrix, said particles being in the size range of 10 to 60 mesh and being present in an amount for effective abrasion resistance, the particles comprising metal carbide grains of chromium carbide of an average grain size in the range of 0.5 to 25 microns disposed in a binder comprising a major portion of nickel.
A tool for use in the penetration of earthen formations wherein the tool has a region of steel subject to excessive wear, said tool having an improved hardfacing on such region of sintered chromium carbide particles metallurgically bonded to the tool by a matrix consisting essentially of the underlying steel of said tool alloyed with the particles at the interfaces therebetween with the interfaces being free from any brittle intermetallic compound such as would interfere with the alloy bond between the particles and matrix, said particles being in the size range of 14 to 30 mesh and being present in an amount for effective abrasion resistance, the particles comprising chromium carbide grains in an amount of 70 to 95 percent, titanium carbide grains in an amount of 2 to 12 percent, and molybdenum carbide grains in an amount of 0.2 to 5 percent, all of said grain being of an average size of from 0.5 to 15 microns, said grains being disposed in from 3 to 16 percent of nichrome binder containing 75 to 95 percent nickel and 25 to 5 percent chromium.
A material for hardfacing earth drilling and mining tools using welding techniques comprising a plurality of discrete sintered chromium carbide particles having a size within the range of 10 to 60 mesh, the particles comprising grains of chromium carbide having an average grain size in the range of 0.5 to 25 microns disposed in a binder comprising a major portion of nickel.
Dependencies are inferred from the claim text.