5214 results about "Cemented carbide" patented technology

The invention relates to a tool, especially a cutting insert for cutting metallic materials, which consist of a hard metal, cermet ceramics or steel base, especially of a high speed steel base, and at least one layer deposited thereon. The single layer, or in the case of several layers the outer layer or the layer underneath the outer layer, contains molybdenum sulfide. The aim of the invention is to improve the resistance to wear of the friction-reducing, molybdenum sulfide containing layer even at high pressures. To this end, the molybdenum sulfide containing layer consists of an alternating sequence of two layer that are different from one another. The first layer contains 51 to 100% by weight of metallic molybdenum and the second layer contains 21 to 100% by weight of MoS2 which substantially consists of hexagonal crystals that are at least substantially oriented in a plane parallel to the tool surface.

The present invention relates to compositions and methods for forming a bit body for an earth-boring bit. The bit body may comprise hard particles, wherein the hard particles comprise at least one carbide, nitride, boride, and oxide and solid solutions thereof, and a binder binding together the hard particles. The binder may comprise at least one metal selected from cobalt, nickel, and iron, and at least one melting point reducing constituent selected from a transition metal carbide in the range of 30 to 60 weight percent, boron up to 10 weight percent, silicon up to 20 weight percent, chromium up to 20 weight percent, and manganese up to 25 weight percent, wherein the weight percentages are based on the total weight of the binder. In addition, the hard particles may comprise at least one of (i) cast carbide (WC+W2C) particles, (ii) transition metal carbide particles selected from the carbides of titanium, chromium, vanadium, zirconium, hafnium, tantalum, molybdenum, niobium, and tungsten, and (iii) sintered cemented carbide particles.

The present invention relates to a cutting tool comprising a body of sintered cemented carbide or cermet, ceramic or high speed steel on which at least one of the functioning parts of the surface of the body, a thin, adherent, hard and wear resistant coating is applied. The coating comprises a laminar, multilayered structure of refractory compounds in polycrystalline, non-repetitive form, MX/NX/MX/NX where the alternating layers MX and NX are metal nitrides or carbides with the metal elements M and N selected from the group consisting of Ti, Nb, Hf, V, Ta, Mo, Zr, Cr, Al and W. The sequence of individual layer thicknesses is essentially aperiodic throughout the entire multilayered structure, and layer thicknesses are larger than 0.1 nanometer but smaller than 30 nanometer, preferably smaller than 20 nanometer. The total thickness of said multilayered coating is larger than 0.5 mu m but smaller than 20 mu m.

A polycrystalline diamond abrasive element, particularly a cutting element, comprises a table of polycrystalline diamond bonded to a substrate, particularly a cemented carbide substrate, along a non-planar interface. The non-planar interface typically has a cruciform configuration. The polycrystalline diamond has a high wear-resistance, and has a region adjacent the working surface lean in catalysing material and a region rich in catalysing material. The region lean in catalysing material extends to a depth of 40 to 90 microns, which is much shallower than in the prior art. Notwithstanding the shallow region lean in catalysing material, the polycrystalline diamond cutters have a wear resistance, impact strength and cutter life comparable to that of prior art cutter, but requiring only 20% of the treatment times of the prior art cutters.

This invention relates to cutting inserts for earth boring bits comprising a cutting zone, wherein the cutting zone comprises first cemented hard particles and a body zone, wherein the body zone comprises second cemented hard particles. The first cemented hard particles may differ in at least one property from the second cemented hard particles. As used herein, the cemented hard particles means a material comprising hard particles in a binder. The hard particles may be at least one of a carbide, a nitride, a boride, a silicide, an oxide, and solid solutions thereof and the binder may be at least one metal selected from cobalt, nickel, iron and alloys of cobalt, nickel or iron.

A polycrystalline diamond abrasive element, particularly a cutting element, comprises a layer of polycrystalline diamond having a working surface and bonded to a substrate, particularly a cemented carbide substrate, along an interface. The polycrystalline diamond abrasive element is characterised by using a binder phase that is homogeneously distributed through the polycrystalline diamond layer and that is of a fine scale. The polycrystalline diamond also has a region adjacent the working surface lean in catalysing material and a region rich in catalysing material.

The invention discloses a long-service-life split type valve seat. The long-service-life split type valve seat comprises linings and bases. The linings are embedded into the outlet ends of the bases.The linings are matched with a valve body for use. Each lining is a tungsten carbide alloy. The long-service-life split type valve seat has the beneficial effects that the valve seat is composed of the linings and the bases, the linings are made of a hard alloy material, the hardness, the strength, the wear resistance and the corrosion resistance of the linings are improved, and the service life of the valve seat is greatly prolonged; the valve seat is of a split structure, once abrasion occurs, only the linings or the bases need to be replaced, integral replacement is not needed, maintenanceis convenient, the time and labor are saved, and meanwhile the production cost of an oil and gas field is reduced; the appropriate diameter sizes of the linings can be selected according to the working pressure, the conveying medium, the degree of abrasion of the valve body to the valve seat and the like in actual working conditions, and the application range is wide; the linings and the bases arein various shapes and can be combined according to actual working condition requirements, and the applicability is high.

The invention discloses a superfine WC-Co cemented carbide containing rare-earth elements and a preparation method thereof, belonging to the technical field of cemented carbide. In the cemented carbide, the weight of WC rigid phase accounts for 85-94% of that of the cemented carbide, the weight of Co binder phase accounts for 5-14% of that of the cemented carbide, the weight of grain growth inhibitor accounts for 0.3-2.0% of that of the cemented carbide, and the weight of the thulium in the rare earth addition accounts for 0.2-1.2% of that of the Co binder phase. The method comprises the following steps: weighing various powder stocks, ball-milling, drying and pelletizing to form a compound; and suppressing and shaping the compound, sintering and cooling to obtain the cemented carbide. The adding mode of nano rare earth oxide or Co-RE composite powder can be implemented easily and conveniently, and the rare earth is diffusely and evenly distributed, thereby facilitating to perform physo-chemical reactions; and the cemented carbide has the advantages of low production cost, stable and enhanced performance and easy implementation, production and application.

The present invention relates to compositions and methods for forming a bit body for an earth-boring bit. The bit body may comprise hard particles, wherein the hard particles comprise at least one carbide, nitride, boride, and oxide and solid solutions thereof, and a binder binding together the hard particles. The binder may comprise at least one metal selected from cobalt, nickel, and iron, and, optionally, at least one melting point reducing constituent selected from a transition metal carbide in the range of 30 to 60 weight percent, boron up to 10 weight percent, silicon up to 20 weight percent, chromium up to 20 weight percent, and manganese up to 25 weight percent, wherein the weight percentages are based on the total weight of the binder. In addition, the hard particles may comprise at least one of (i) cast carbide (WC+W2C) particles, (ii) transition metal carbide particles selected from the carbides of titanium, chromium, vanadium, zirconium, hafnium, tantalum, molybdenum, niobium, and tungsten, and (iii) sintered cemented carbide particles.

A polycrystalline diamond abrasive cutting element consists generally of a layer of high grade polycrystalline diamond bonded to a cemented carbide substrate. The polycrystalline diamond layer has a working surface and an outer peripheral surface and is characterized by having an annular region or a portion thereof adjacent the peripheral surface that is lean in catalysing material. A region adjacent the working surface is also lean in catalysing material such that in use, as a wear scar develops, both the leading edge and the trailing edge thereof are located in a region lean in catalysing material.

In one aspect of the present invention, a high impact resistant tool has a superhard material bonded to a cemented metal carbide substrate at a non-planar interface. The cemented metal carbide substrate is bonded to a front end of a cemented metal carbide segment. A stem formed in the base end of the carbide segment opposite the front end is press fit into a bore of a steel body. The steel body is rotationally fixed to a drum adapted to rotate about its axis.

The invention is to prolong the life time of tools dramatically by (1) considerably improving the flaking resistance of the coating layer at the time of cutting, (2) increasing the wear resistance and crater resistance of the coating layer itself, and (3) enhancing the breakage strength of the coating layer in comparison with the conventional coating cutting tools. In order to achieve the object, the coated cemented carbide of the invention has the following structure in the coating layer on the surface of the cemented carbides: The outer layer has an Al2O3 layer practically having an alpha-type crystal structure. The Al2O3 layer has a region where alpha-type and kappa-type crystal grains coexist in the first row of the crystal grains that grow on the inner layer. In addition to that, the crystal grains of alpha-Al2O3 in the region include no pores.

The principal object of the present invention is to provide a coated cemented carbide tool whose both properties of breakage resistance and wear resistance are improved and whose life is lengthened.The present invention has been made to achieve this object and is related with a coated cemented carbide cutting tool comprising a substrate consisting of a matrix of WC and a binder phase of an iron group metal and a plurality of coated layers provided on a surface of the substrate, in which (a) an innermost layer, adjacent to the substrate, of the coated layers consists essentially of titanium nitride having a thickness of 0.1 to 3 mum, (b) on a mirror-polished cross-sectional microstructure of the said tool, an average crack interval in the coated film on a ridge of a cutting edge and/or rake face is smaller than an average crack interval in the coated layer on a flank face, (c) at least 50% of the cracks in the coated film on the said ridge of the cutting edge and/or rake face have ends of the cracks in the said innermost titanium nitride layer, in a layer above the titanium nitride layer or in an interface between these layers and (d) an average crack length in the coated film on the said ridge of the cutting edge and/or rake face is shorter than an average film thickness on the flank face.According to the present invention, quantitatively specifying the crack intervals and positions of the ends of the cracks in the coated layer results in excellent breakage resistance as well as wear resistance.

There is disclosed a cemented carbide insert with excellent properties for machining of steels and stainless steels. The cemented carbide comprises WC and 4-25 wt-% Co. The WC-grains have an average grain size in the range 0.2-3.5 mum and a narrow grain size distribution in the range 0-4.5 mum.According to the method of the invention a cemented carbide cutting tool insert is made by mixing powders of WC, TiC, TaC and/or NbC, binder metal and pressing agent, drying preferably by spray drying, pressing to inserts and sintering. The method characterised inthat a deagglomerated WC-powder with a narrow grain size distribution is used,that the powders of TiC, TaC and/or NbC are deagglomerated andthat the mixing is wet mixing with no change in grain size or grain size distribution.

The invention discloses a material adopting a thin graphene and metal powder composite structure, a preparation method and an application thereof. The material adopting the composite structure comprises metal powder bridged by and coated with thin graphene. The preparation technology of the material comprises the steps as follows: mixing transition metal powder or reduced transition metal powder with the thin graphene, and growing the thin graphene on the surface of the transition metal powder through CVD (chemical vapor deposition) and coating the surface of the transition metal powder with the thin graphene, so as to obtain the metal powder bridged by and coated with the thin graphene; or growing the thin graphene on the surface of the transition metal powder through the CVD, and then compositing the metal powder with the thin graphene to obtain a target product. The invention has the advantages that the technology is simple; the oxidation resistance and the corrosion prevention of the metal powder can be enhanced, meanwhile, the metal powder has good heat conduction, antistatic and electromagnetic shielding properties, the service life of the metal powder can be prolonged, and the cost can be reduced; and besides, the material has a wide application prospect in antistatic performance, thermal management, heat conduction and radiation, electromagnetic shielding, catalysts, sintering activators, electro-conduction slurry, batteries, cemented carbide and the like.

An article includes a working portion including cemented carbide, and a heat sink portion in thermal communication with the working portion. The heat sink portion includes a heat sink material having a thermal conductivity greater than a thermal conductivity of the cemented carbide. Also disclosed are methods of making an article including a working portion comprising cemented carbide, and a heat sink portion in thermal communication with the working portion and including a heat sink material having a thermal conductivity that is greater than a thermal conductivity of the cemented carbide. The heat sink portion conducts heat from the working portion.

Embodiments of the present invention include composite articles comprising at least a first region and a second region and methods of making such articles. The first region may comprise a first composite material, wherein the first region comprises less than 5 wt. % cubic carbides by weight, and the second region may comprise a second composite material, wherein the second composite material differs from the first composite material in at least one characteristic. The composite article may additionally comprise at least one coolant channel. In certain embodiments, the first and second composite material may individually comprise hard particles in a binder, wherein the hard particles independently comprise at least one of a carbide, a nitride, a boride, a silicide, an oxide, and solid solutions thereof and the binder comprises at least one metal selected from cobalt, nickel, iron and alloys thereof. In specific embodiments, the first composite material and the second composite material may individually comprise metal carbides in a binder, such as a cemented carbide.