Abrégé

The present invention relates to the technical field of hard alloys. Disclosed are a binder-phase-free hard alloy, and a preparation method therefor and the use thereof. Since the content of a binder-phase metal in the binder-phase-free hard alloy as provided is less than or equal to 1 wt%, WC crystal grains are difficult to grow into a plate-shaped morphology by means of dissolution-precipitation in the binder-phase metal, and the diffusion growth rate of each crystal plane and crystal boundary of the WC crystal grains is directionally controlled by adding elements such as boron, titanium, chromium and vanadium and controlling the amounts thereof; therefore, a portion of the crystal grains is controlled to grow into a polygonal lamellar morphology, crystal grains with a polygonal lamellar morphology are prepared under the conditions of substantially no binder-phase metal being present and flattening treatment not being required for raw material powder, the toughness of the binder-phase-free hard alloy is effectively improved, and the hardness is prevented from being significantly reduced to decrease the wear resistance.

Classes IPC  ?

• C22C 29/08 - Alliages à base de carbures, oxydes, borures, nitrures ou siliciures, p. ex. cermets, ou d'autres composés métalliques, p. ex. oxynitrures, sulfures à base de carbures ou de carbonitrures à base de carbures mais ne contenant pas d'autres composés métalliques à base de carbure de tungstène
• C22C 29/06 - Alliages à base de carbures, oxydes, borures, nitrures ou siliciures, p. ex. cermets, ou d'autres composés métalliques, p. ex. oxynitrures, sulfures à base de carbures ou de carbonitrures à base de carbures mais ne contenant pas d'autres composés métalliques
• C22C 29/02 - Alliages à base de carbures, oxydes, borures, nitrures ou siliciures, p. ex. cermets, ou d'autres composés métalliques, p. ex. oxynitrures, sulfures à base de carbures ou de carbonitrures
• C22C 29/00 - Alliages à base de carbures, oxydes, borures, nitrures ou siliciures, p. ex. cermets, ou d'autres composés métalliques, p. ex. oxynitrures, sulfures
• C22C 1/10 - Alliages contenant des composants non métalliques
• B22F 3/00 - Fabrication de pièces ou d'objets à partir de poudres métalliques, caractérisée par le mode de compactage ou de frittageAppareils spécialement adaptés à cet effet

Abrégé

Disclosed in the present invention is a method for preparing an ultrafine WC cemented carbide having a molecular formula of WC-T-HEA, wherein T is at least one of a carbide, an oxide or a boride, and HEA is a high-entropy alloy. The method comprises: smelting and casting raw materials of a high-entropy alloy to prepare a high-entropy alloy ingot; crushing, under the protection of an inert atmosphere, the high-entropy alloy ingot by means of mechanical crushing to obtain a high-entropy alloy coarse powder; adding a submicron WC powder, a T powder and the high-entropy alloy coarse powder to an airflow grinding pulverizer according to the proportions of the components of an ultrafine WC cemented carbide to carry out airflow grinding pulverization of same in an inert atmosphere, wherein the step of grading is omitted, such that a previously separated powder, which is less than 1 μm, is mixed into the pulverized powder to obtain a mixed fine powder; and then, pressing, forming and sintering same. The present invention can solve the problem whereby the oxygen content is too high in the preparation process of an ultrafine WC cemented carbide and improve the processing performance of the ultrafine WC cemented carbide, and can meet the requirements of an optical grade surface by means of processing.

Classes IPC  ?

• C22C 29/08 - Alliages à base de carbures, oxydes, borures, nitrures ou siliciures, p. ex. cermets, ou d'autres composés métalliques, p. ex. oxynitrures, sulfures à base de carbures ou de carbonitrures à base de carbures mais ne contenant pas d'autres composés métalliques à base de carbure de tungstène
• C22C 29/02 - Alliages à base de carbures, oxydes, borures, nitrures ou siliciures, p. ex. cermets, ou d'autres composés métalliques, p. ex. oxynitrures, sulfures à base de carbures ou de carbonitrures
• C22C 1/05 - Mélanges de poudre métallique et de poudre non métallique
• B22F 9/04 - Fabrication des poudres métalliques ou de leurs suspensionsAppareils ou dispositifs spécialement adaptés à cet effet par des procédés physiques à partir d'un matériau solide, p. ex. par broyage, meulage ou écrasement à la meule
• C22C 1/02 - Fabrication des alliages non ferreux par fusion
• C22C 30/00 - Alliages contenant moins de 50% en poids de chaque constituant

Abrégé

The present invention provides a WC-based hard alloy. The molecular formula of the WC-based hard alloy is T-WC-HAE, wherein T is at least one of carbide, oxide or boride, and HAE is a high-entropy alloy; the HAE is selected from at least five of Al, Cu, Nb, Ti, Zr, Ge, Si, V, Ta, Cr, Mn, Ce, Mo, W and Hf elements; the T contains an element B; in the WC-based hard alloy, the content of the HAE is 0.5 wt%-5 wt%, the content of the T is 35 wt% or less, and the balance is WC and inevitable impurities; the content of the B is 0.1 wt%-3 wt%; the melting point of the HAE is 1850°C or less; the atomic ratio of the elements in the HAE is 0.33-1 according to the measurement of an energy dispersive spectrometer. The WC-based hard alloy of a novel alloy system has excellent strength and toughness, relatively high thermal conductivity and thermal stability and high density, and can meet optical-grade surface requirements by means of processing.

Classes IPC  ?

• C22C 29/08 - Alliages à base de carbures, oxydes, borures, nitrures ou siliciures, p. ex. cermets, ou d'autres composés métalliques, p. ex. oxynitrures, sulfures à base de carbures ou de carbonitrures à base de carbures mais ne contenant pas d'autres composés métalliques à base de carbure de tungstène
• C22C 29/02 - Alliages à base de carbures, oxydes, borures, nitrures ou siliciures, p. ex. cermets, ou d'autres composés métalliques, p. ex. oxynitrures, sulfures à base de carbures ou de carbonitrures
• C22C 1/05 - Mélanges de poudre métallique et de poudre non métallique
• B22F 9/04 - Fabrication des poudres métalliques ou de leurs suspensionsAppareils ou dispositifs spécialement adaptés à cet effet par des procédés physiques à partir d'un matériau solide, p. ex. par broyage, meulage ou écrasement à la meule
• C22C 30/00 - Alliages contenant moins de 50% en poids de chaque constituant
• C22C 30/02 - Alliages contenant moins de 50% en poids de chaque constituant contenant du cuivre
• C03B 23/00 - Finition du verre façonné
• C03C 19/00 - Traitement de surface du verre, autre que sous forme de fibres ou de filaments, par des procédés mécaniques
• B29C 33/38 - Moules ou noyauxLeurs détails ou accessoires caractérisés par la matière ou le procédé de fabrication
• G02B 3/00 - Lentilles simples ou composées

Produits et services

Tungsten carbide; carbide. Anti-friction metal, laths of metal; sheets and plates of metal; tungsten; poles of metal; peeled metal bars; drawn and polished metal bars; bright steel bars; alloys of common metal; tungsten powder; cobalt, raw; pipes of metal. Glaziers' diamonds [parts of machines]; gear machining tools; blades for circular saws [parts of machines]; band saws; cutting saws [parts of machines]; drilling heads [parts of machines]; blades [parts of machines]; tools [parts of machines]; turning tools [machine tools]; hole machining tools; milling cutters; threaded cutting tools [machine tools]; broaching tools; tool apron [parts of machines]; chucks [parts of machines]; drill chucks [parts of machines]; knives [parts of machines]; holding devices for machine tools; milling machines; lathes [machine tools]; boring machines; grinding machines. Files [tools]; reamers; tap wrenches; wrenches [hand tools].

Produits et services

Hand tools, namely, files

Produits et services

Tungsten carbide; carbide; alkaline-earth metals; carbonates; acetates (chemicals); esters; industrial chemicals; artificial resins, unprocessed; isotopes for industrial purposes. Tungsten powder; cobalt powder; tungsten; cobalt (raw); posts of metal; cermets; rods of metal for welding; sheets and plates of metal; laths of metal; steel alloys; tungsten alloys. Milling cutter; drilling heads (parts of machines); spot face cutter; blades (parts of machines); cutting tool (including mechanical blade); thread cutting tools (parts of machines); turning tool (parts of machines); circular saw blade (machine part); steel ball (parts of mineworking machines); tools (parts of machines); gear knife tool.

Produits et services

Tungsten carbide; carbide; alkaline-earth metals; carbonates; acetates; methyl esters; industrial chemicals; artificial resins, unprocessed; isotopes for industrial purposes Tungsten powder; cobalt powder; tungsten; raw cobalt; posts of metal; cermets; rods of metal for welding; sheets and plates of metal for further manufacture; laths of metal; steel alloys; tungsten alloys Machine tools for the cutting and forming of materials and parts therefore, namely, milling cutter, drilling heads, spot face cutter, blades, cutting tool, mechanical blade, thread cutting tools, turning tool, circular saw blade, steel ball for mineworking machines, tools, gear knife tool

Produits et services

(1) Tungsten carbide powder; double carbide, namely tungsten titanium carbide powder; tungsten metal powder. (2) Ready to press powder, namely ready to press cemented carbide grade powders; thermal spray powder; cemented carbide; heavy metal, namely tungsten alloys; cast tungsten carbide; cobalt powder; tungsten; cobalt; tungsten carbide and tungsten carbide alloys in the form of rods, flakes, plates and strips for industrial use; metal ceramics, namely cermet; metal welding rods; endmills; drills for use in the mining industry; carbide inserts; solid carbide tools, namely cutting tools made from tungsten carbide for cutting metal, stone, wood, glass and diamond; lathe cutters; hole machining tools, namely cutting tools for making holes; machine cutting tools, namely gear cutters; round tips, namely round sawblades; carbide balls, namely bearing balls made of tungsten carbide.