34results about How to "Play the role of purifying the interface" patented technology

The invention relates to a preparation method of modified high-manganese steel base TiC steel bonded carbide. The preparation method is characterized by preparing in-situ synthesized TiC powder in a required proportion from titanium powder and graphite powder according to the atomic ratio of C to Ti, namely 0.8-1.0; preparing the raw materials including ferromolybdenum powder, ferrovanadium powder, ferrochrome powder, ferromanganese powder, ferrosilicon powder, ferrum powder, nickel powder, colloidal graphite and rare earth according to a required proportion of mass ratios of chemical components of bonding phase metals, filling steel balls, performing ball milling, adding absolute ethyl alcohol used as a medium and PVA (polyvinyl alcohol) to the steel balls, drying the slurry after ball milling, and then forming the slurry by pressing and sintering the product, thus obtaining steel bonded carbide. The preparation method has the advantages that the modified high-manganese steel base TiC steel bonded carbide is prepared by combining an in-situ reactive synthesis technology and a liquid phase sintering technology; as TiC is synthesized in situ inside a matrix through reaction in the sintering process, the reinforced particles have small sizes and do not have sharp corners on the surfaces, and the matrix is better in interface bonding and has a clean interface; the preparation method of steel bonded carbide is conductive to improving the comprehensive mechanical properties of carbide, is low in price and is simple and convenient in process.

The invention relates to a preparation method of high-strength-and-toughness high-wear-resistance TiC/TiN steel bond hard alloy. The preparation method of the high-strength-and-toughness high-wear-resistance TiC/TiN steel bond hard alloy is characterized in that one of TiO2 powder, TiH2 powder and Ti powder is mixed with aquadag powder with the atomic ratio of C/Ti being 0.7-1.1, and one of the TiO2 powder, the TiH2 powder and the Ti powder is mixed with carbamide ((NH2) 2CO ) with the atomic ratio of N/Ti being 0.4-1.1 and made into in-situ synthesized TiN mixed powder; ferrochromium powder, ferromolybdenum powder, ferrovanadium powder, ferrotungsten powder, ferroniobium powder, nickel powder, ferroboron powder, iron power, aquadag and rare earth raw materials are mixed according to the needed chemical component mass ratio of adhesive phase metal and placed in a steel ball mill, absolute ethyl alcohol is added and used a medium, and PVA is also added; and after ball milling, slurry is dried, and then the steel bond hard alloy is obtained through pressing forming and sintering. According to the preparation method of the high-strength-and-toughness high-wear-resistance TiC/TiN steel bond hard alloy, the in-situ reaction and synthesis technology and the liquid phase sintering technology are combined, the reinforced particles are fine in size, the surfaces of the particles are free of sharp corners, matrix interface bonding is good, and the matrix interface is clean. By the adoption of the preparation method of the steel bond hard alloy, the comprehensive mechanical performance of the prepared steel bond hard alloy can be improved, the cost is low, and the technology is simple and convenient.

The invention relates to a preparation method for high-toughness modified high-manganese steel-based TiC/TiN steel-bonded hard alloy. The preparation method is characterized in that one of Ti02 powder, TiH2 powder or Ti powder and colloidal graphite powder are prepared according to the atomic ratio being 0.7-1.1 to be in-situ synthesized TiC mixed powder; one of Ti02 powder, TiH2 powder or Ti powder and urea ((NH2)2CO) are prepared according the atomic ratio being 0.4-1.1 to be in-situ synthesized TiN mixed powder; ferromolybdenum powder, ferrovanadium powder, ferrochrome powder, ferromanganese powder, ferrosilicon powder, ferrous powder, nickel powder, colloidal graphite and rare earth raw materials are prepared according to the needed proportion of the adhesive phase metal chemical composition mass ratio; steel balls are stored, and ball milling is conducted, wherein absolute ethyl alcohol is added to serve as a medium and PVA; and after ball milling is conducted, slurry is dried and then subjected to pressing forming, sintering is conducted, and the steel-bonded alloy is obtained. According to the preparation method, in-situ reaction synthetic technology and liquid phase sintering technology are combined, the fineness of particle sizes is enhanced, the surface has no sharp corners, combination of the substrate interface is good, and the interface is clean; the preparation method for the steel-boned alloy can improve the comprehensive mechanical property of the alloy, the price is low, and the technique is simple and convenient.

The invention relates to a preparation method of a high-strength/ductility high manganese steel base TiN steel bonded hard alloy. The preparation method is characterized by preparing in-situ synthesized TiN powder: one or three of TiO2 powder, TiH2 powder or Ti powder and urea ((NH2)2CO) are mixed according to a N/Ti atomic ratio of 0.4-1.1 to prepare the in-situ synthesized TiN mixed powder; and ferromolybdenum powder, ferrovanadium powder, ferrochromium powder, ferromanganese powder, ferrosilicon powder, iron powder, nickel powder, colloidal graphite and rare earth raw materials are mixed according to a ratio needed by a bonding phase metal chemical component mass ratio, and are sintered to obtain the TiN steel bonded alloy. The preparation method combines the in-situ reaction synthesis technology with the liquid-phase sintering technology; and reinforced particles are fine in size, free of sharp angles on the surfaces, better in matrix interface combination and clean in interfaces. The steel bonded alloy preparation method can improve the comprehensive mechanical performance of the alloy, and is low in cost and simple in process.

The invention relates to a preparation method of an improved chromium-tungsten-manganese low-alloy cold work die steel base VC steel bonded hard alloy. The preparation method comprises the following steps: titanium carbide powder and medium-alloy hot work die steel matrix powder are weighed in proportion; alloy powder is put in a ball mill for mixing and crushing, wherein anhydrous ethanol is added as a process control agent; and after ball milling, wet mixed powder is put in a vacuum drying box for drying for future use. An organic monomer and an initiator are added in solvent to prepare premixed liquid; an additive for improving the slurry fluidity and dispersibility is added; a catalyst and a pH adjusting agent are added for uniformly stirring to obtain slurry; the slurry is injected in an injection condensation mold for vacuumizing or vibration degassing; after the slurry is formed by curing, a blank is put in the vacuum drying box for drying; and the dried blank is integrally degummed and sintered in the vacuum sintering furnace to prepare the steel bonded hard alloy. On the basis of guaranteeing macro-performances of the steel bonded hard alloy, the preparation method has the advantages of simple process, lower cost and easy preparation of large-size and complex-shape parts.

The invention relates to a preparing method for a VC-VN plastic steel base steel bond hard alloy. The preparing method includes the following steps that titanium carbide powder and plastic steel base powder are weighed according to the proportion, alloy powder is put into a ball grinding machine to be mixed and smashed, added absolute ethyl alcohol serves as a process control agent, and the wet mixed powder is put into a vacuum drying box after ball grinding to be dried for standby use; an organic monomer and an initiator are added into a solvent to prepare pre-mixed liquid; an additive for improving slurry fluidity and dispersity is added; a catalyst and a pH modifier are added and are evenly stirred, and slurry is obtained; and the slurry is injected into an injection and coagulation die, vacuum suction or vibration gas removing is conducted, after the slurry is cured to be formed, a blank is put into the vacuum drying box to be dried, the dried blank is subjected to integrated degumming and sintering in a vacuum sintering furnace, and the steel bond hard alloy is prepared. The preparing method has the beneficial effects that the technology is simple, the cost is relatively low, and parts large in size and complex in shape are easy to prepare on the basis that the macro performance of the steel bond hard alloy is ensured.

The invention relates to a preparation method for a VC plastic steel based steel bond hard alloy. The preparation method comprises the following steps that carbonized titanium powder and plastic steel matrix powder are weighed in proportion, and the alloy power is placed into a ball mill for mixing and crushing, wherein absolute ethyl alcohol is added as a process control agent, wet mixing powder is placed into a vacuum drying box for drying after ball milling, and drying is conducted for later use; organic monomers and an initiating agent are added into a solvent for premixed solution preparation; an addition agent for improving fluidity and dispersity of slurry is added; catalysts and a pH adjusting agent are added and evenly stirred, and the slurry is obtained; and the slurry is injected into an injection condensing die for vacuumizing or vibration degasification, a blank is placed into the vacuum drying box for drying after the slurry is solidified and formed, the dried blank is subjected to integrated degumming and sintering in a vacuum sintering furnace, and thus the steel bond hard alloy is prepared. On the basis of the condition that macro-performance of the steel bond hard alloy is guaranteed, the preparation method for the VC plastic steel based steel bond hard alloy has the advantages that the technique is simple, cost is low, and parts with large dimensions and complex shapes are easy to prepare.

The invention relates to a preparation method of TiC heatproof steel bonded carbide. The method comprises the following steps: processing titanium powder and graphite powder according to a C/Ti atom ratio of 0.7-1.1 to prepare in situ synthesized TiC powder with a required ratio; and preparing ferrochrome powder, ferromolybdenum powder, ferroboron powder, iron powder, nickel powder, copper powder, colloidal graphite and a rare earth raw material according to the required proportions of a mass ratio of bonding phase metal chemical components, adding a steel ball, adding anhydrous ethanol as a medium, adding PVA, carrying out ball milling, drying a slurry obtained after ball milling, carrying out compacting formation, and sintering to obtain steel bonded carbide. The TiC/heatproof steel bonded carbide is prepared in the invention through combining an in situ reaction synthesis technology with a liquid phase sintering technology. TiC is synthesized in situ in a matrix through a reaction in the sintering process, so fine dimension of particles is enhanced, the surface has no closed angles, the matrix interface combination is good, and the interface is clean. The preparation method of the steel bonded carbide has the advantages of improvement of the comprehensive and mechanical performances of the carbide, low price, and simple process.

The invention relates to a method for preparing TiC medium alloy cold-working die steel-based steel-bonded hard alloy, comprising the following steps: weighing titanium carbide powder and medium-alloy cold-working die steel matrix powder according to the proportion, and putting the alloy powder into a ball mill Mixing and crushing are carried out, wherein anhydrous ethanol is added as a process control agent, after ball milling, the wet mixed powder is put into a vacuum drying oven for drying, and it is used for later use after drying. Add organic monomers and initiators to the solvent to prepare a premix; add additives to improve the fluidity and dispersibility of the slurry; add catalysts and pH regulators and stir evenly to obtain a slurry; inject the slurry into the casting mold and vacuumize Or vibration degassing, after the slurry is solidified and formed, the green body is put into a vacuum drying oven for drying, and the dried green body is degummed and sintered in a vacuum sintering furnace to prepare a steel-bonded hard alloy. On the basis of ensuring the macroscopic properties of the steel-bonded hard alloy, the invention has the advantages of simple process, low cost and easy preparation of parts with large size and complex shape.