51results about How to "Hardness does not decrease" patented technology

The invention relates to the tire manufacture field, especially to a tire apex composition for improving a bond system and its preparation method and application. The tire apex composition for improving the bond system is formed by the mixing of the following ingredients of: by weight, 70-100 parts of natural rubber, 0-30 parts of styrene-butadiene rubber, 55-75 parts of carbon black, 1.0-4.0 parts of resorcinol, 0.2-3.0 parts of cobalt decanoate, 3-8 parts of a methylene donator adhesive, 0-20 parts of white carbon black, 3-8 parts of a vulcanizing agent and a sulfuration promoter and other processing auxiliary agents. The tire apex composition for improving a bond system obviously raises modulus and binding property, decreases heat generation, minimizes modulus loss at high temperature,and simultaneously reduces formula cost. By employing BTR tires under the precondition of unchanged structure, the hard apex strength and hardness can be guaranteed not to be decreased, the modulus is substantially increased, the bond performance between the apex and steel wires/steel wire cords is remarkably improved, and the anti-destroy performance of tire bead positions is raised.

The invention relates to super-hard copper-containing martensite antibiotic stainless steel. The stainless steel comprises the following chemical components by weight percent: 0.8-1.2% of C, 16-18% of Cr, 1.0-3.0% of Mo, 0.1-1.0% of V, 1.0-3.0% of W, 0.5-3.0% of Ni, 2.5-3.5% of Cu, 0.1-1.0% of Re, less than or equal to 0.035% of S, less than or equal to 0.03% of P, less than or equal to 2.0% of other impurities and the balance of Fe. The copper-containing martensite antibiotic stainless steel has good antibiotic property, and the hardness and wear resistance of the stainless steel are greatlyimproved, thereby meeting the requirement of cutters manufactured in industries such as family, medical treatment and the like on the hardness and antibiotic property of the stainless steel.

The invention relates to the field of growth of monocrystalline diamonds through a microwave plasma chemical vapor deposition method and in particular relates to a gradient monocrystalline diamond anda preparation method thereof. Microwave plasma chemical vapor deposition equipment is adopted and high-purity air is introduced in a hydrogen and methane mixed gas source according to a continuous gradient concentration, so as to realize alternating deposition of a high-quality monocrystalline diamond layer without nitrogen and a nitrogen-containing diamond layer; then the gradient monocrystalline diamond with high quality, high strength and good toughness is prepared.

The invention discloses a multiple-wire submerged-arc welding technology for guaranteeing subsea pipeline steel pipe connector comprehensive performance, and belongs to the technical field of pipeline steel welding. The multiple-wire submerged-arc welding technology solves the problem that impact energy of 28.8mmX65MS pipeline steel pipe weld metal and fusion lines and connector rigidity cannot meet the engineering requirements. Welding of an inner weld joint and welding of an outer weld joint are completed by the adoption of automatic three-wire submerged-arc welding, a first wire of the inner weld joint, a second wire of the inner weld joint and a weld wire of the outer weld joint are H08C weld wires, and a third wire of the inner weld joint is an H08E weld wire; the diameter of the first wire and the diameter of the second wire are respectively 4.0mm, and the diameter of the third wire is 3.2mm. The bevel angle of a connector should be as small as possible, the base metal fusion ratio is improved, the comprehensive performance of the connector is guaranteed through weld joint attenuation by base metal, the bevel angle is chosen to be 60 degrees to 70 degrees, and a truncated edge of 8-10mm is reserved. According to the multiple-wire submerged-arc welding technology, through optimization of the bevel angle and different matching of weld materials, the harsh requirements for the comprehensive performance of the steel pipe welding connector of a subsea pipeline with the ratio of thickness to radial dimension being 0.0354 are met, and the technology is economical, simple and convenient to apply, easy to implement and beneficial to popularization.

The invention relates to high-hardness silver-containing martensite antibacterial stainless steel. The stainless steel comprises the following chemical components in percentage by weight: 0.8-1.2% of C, 16-18% of Cr, 1.0-3.0% of Mo, 0.1-1.0% of V, 1.0-3.0% of W, 0.7-1.2% of Al, 0.1-0.2% of Ag, 0.1-1.0% of Re, not more than 0.035% of S, not more than 0.03% of P, not more than 2.0% of other impurities and the balance of Fe. The silver-containing martensite antibacterial stainless steel disclosed by the invention has the advantages of excellent antibacterial property larger than 99.0%, largely improved hardness and wear resistance and not less than HRC57 of hardness, and meets the requirements of cutter manufacturing of household, medical and the like industries on hardness and antibacterialproperty.

The invention provides three-phase structured cemented carbide and a preparation method thereof. The three-phase structured cemented carbide is characterized in that middle bonding phase cemented carbides are distributed on the surfaces of spherical particles of low bonding phase cemented carbides, and high bonding phase cemented carbides are distributed on the surfaces of particles of the middlebonding phase cemented carbides; the weight ratio of the low bonding phase cemented carbides is 62-85%, the weight ratio of the middle bonding phase cemented carbides is 5-18%, and the weight ratio ofthe high bonding phase cemented carbides is 10-20%; magnetic saturation of the low bonding phase cemented carbides is 145-160 emu/g, magnetic saturation of the middle bonding phase cemented carbidesis 140-155 emu/g, and magnetic saturation of the high bonding phase cemented carbides is 135-150 emu/g; drying mixing and granulating are conducted on power materials of the low bonding phase cementedcarbides and the middle bonding phase cemented carbides; then power materials of the high bonding phase cemented carbides are added for drying mixing and granulating; and the three-phase structured cemented carbide is obtained by low pressure sintering. The three-phase structured cemented carbide is used for oil cylindrical tooth alloy and is of a three-layer structure on a grain structure, and the abrasion resistance is high under the premise of continuous teeth.

The invention discloses a method for preparing a thermally sprayed ceramic coating of a plunger of a high-pressure cleaning machine. A used plasma sprayed ceramic coating has the characteristics of high hardness, high chemical inertness and good high-temperature resistance. The hardness of the coating cannot be reduced below 540 degrees centigrade; due to low surface friction coefficient, the coating has a function of reducing friction of a friction pair; and due to good corrosion resistance, the coating can be applicable in various types of corrosive conditions and is especially applicable to being used in the plunger of the high-pressure cleaning machine.

The invention discloses a multiple-principal-component Laves-base intermetallic compound and a preparation method thereof, belonging to the field of alloy material design. The component element is FeCoNiCrxZr, wherein x is 0.5-1. The principal phase of the multiple-principal-component Laves-base intermetallic compound obtained by arc smelting and heat treatment is a Laves intermetallic compound, or the Laves phase base contains a small amount of bcc-structure solid solution. Due to the high entropic effect and topology structure features of the multiple-principal-component Laves phase, the multiple-principal-component Laves-base intermetallic compound has the advantages of superhigh hardness, superhigh structural stability, superhigh tempering softening resistance and favorable high-temperature aging reinforcement effect, and is applicable to the field of 1100-DEG C-below high-temperature structure materials in industry.

The invention discloses a cutting tool and a manufacturing method thereof. The cutting tool comprises a substrate and a single layer of coating or multiple layers of coatings, the single layer of coating or the multiple layers of coatings coat the substrate, the single layer of coating or the multiple layers of coatings internally at least comprises one layer of (AlxSiyTi1-x-y)N coating, wherein xis greater than or equal to 0.70, y is greater than 0 and less than or equal to 0.1. According to the cutting tool and the manufacturing method thereof, the (AlxSiyTi1-x-y)N coating coats the cuttingtool, high aluminum of the coating is ensured, meanwhile, an amorphous coated nanocrystalline structure is formed due to doping of Si elements, the coating structure is refined, the high-temperaturehardness of the coating is improved, the oxidation resistance of the coating is not reduced, and meanwhile, the wear resistance of the coating is improved.

The invention belongs to the technical field of heat treatment of iron-base alloys and particularly relates to a novel tempering technology adopted after high-speed steel quenching. The novel tempering technology includes the following steps that firstly, M2 high-speed steel is heated to 1210 DEG C to 1230 DEG C, the product is subjected to austenitizing, heat preservation is conducted for 8 min to 12 min, and cooling is conducted to the temperature lower than the martensite start temperature by 5 DEG C to 80 DEG C; secondly, the first time of tempering is conducted, wherein after the first step is completed, the product is heated to 250 DEG C to 270 DEG C, heat preservation is conducted for 80 min to 100 min, and then hardening is conducted; thirdly, the second time of tempering is conducted, wherein after the first time of tempering, the product is heated to 250 DEG C to 270 DEG C again, heat preservation is conducted for 80 min to 100 min, and then hardening is conducted; and fourth, the third time of tempering is conducted, wherein after the second time of tempering is conducted, the product is heated to 520 DEG C to 540 DEG C, heat preservation is conducted for 80 min to 100 min, and then air cooling is conducted. The novel tempering technology is used for machining the product, the toughness of the product can be improved while the product hardness is not reduced, and the service life of the product can be prolonged by about 17% to 24%; and in addition, due to the fact that the tempering temperature is greatly reduced, energy consumption is reduced by about 40% to 46%, and the production cost of an enterprise is effectively reduced.

The invention discloses a powder material for laser manufacturing of a composite lining plate for a rolling mill house and a mill roll bearing block and a manufacturing method of the lining plate. Thepowder material is prepared from the following components in percentage by mass: 0.1%-0.2% of C, 15%-23% of Cr, 0.2%-0.7% of Si, 0.5%-2% of Mo, 2%-3% of Ni, 0.2%-0.7% of B, 0.2%-1.0% of the Mn, 0.02%-0.2% of MnN, 0.1%-0.5% of Y, and the balance of Fe; and the powder material is fused on a substrate through a laser, and subsequent heat treatment and machining are conducted to complete manufacturing of the lining plate. According to the powder material for laser manufacturing of the composite lining plate for the rolling mill house and the mill roll bearing block and the manufacturing method ofthe lining plate, corrosion resistance of the prepared lining plate is outstanding, the service life of the lining plate is at least 2 times an original lining plate, and the production cost is lowered.

The invention discloses a preparation method of a 7CrSiMnMoV diameter-expanding die sheet. The preparation method comprises the following steps: forging a 7CrSiMnMoV alloy steel billet subjected to electroslag remelting and refining; carrying out isothermal annealing on a 7CrSiMnMoV alloy steel forging; carrying out hole plugging on a 7CrSiMnMoV alloy steel diameter-expanding die sheet subjected to rough machining, and coating with a high-temperature-resistant anti-oxidation coating; putting the 7CrSiMnMoV alloy steel diameter-expanding die sheet into an atmosphere protection heating furnace; feeding nitrogen gas, ammonia gas and methanol, and heating; feeding nitrogen gas and methanol for protection, and austenitizing; quenching by using nitrate; and carrying out reshaped tempering. The 7CrSiMnMoV diameter-expanding die sheet prepared according to the invention does not have the defects such as quenching cracks, decarburization and the like, has excellent quenching depth, bending strength, compressive strength, impact toughness and hardness and the like, and can meet the needs of machining; and the 7CrSiMnMoV diameter-expanding die sheet is not deformed after being machined, therefore, the die sheet can meet the requirements of stably carrying out diameter expanding on 20000-30000 tubes.

The invention discloses a preparation method of a high-hardness and high-strength expanding pyramid of a mechanical expanding mill. The preparation steps are as follows: (1) smelting, spheroidizing, inoculating and casting; (2) annealing; (3) plugging holes with refractory clay and asbestos, blocking grooves, sealing center holes so that the preparation works are completed; (4) charging the expanding pyramid of which the large end downwards faces into a tooling of which the bottom is a plane, placing the tooling inside a well-type heating furnace and drying the refractory clay so as to complete the charging operation; (5) by controlling the temperature-raising speed and the temperature-raising temperature, heating; (6) by controlling the temperature-raising speed, the temperature-raising temperature and the temperature-raising time, austenitizing; (7) by controlling the time and temperature, carrying out three-stage quenching; and (8) by controlling the time and temperature, tempering. The high-hardness and high-strength austenitic-bainitic nodular cast iron expanding pyramid subjected to above treatment steps has no defects such as quenching cracks, high quenching depth, good compressive strength, impact toughness and hardness, can meet the needs of machining and cannot be deformed after machining. The expanding pyramid is suitable for preparing steel tubes having steel grade of X60-X80 and wall thickness of 10-18 mm.

The invention belongs to the technical field of material science, and discloses a double-nanostructure tungsten alloy with good high-temperature stability and a preparation method and application thereof. The double-nanostructure tungsten alloy comprises the following raw material components: tungsten, titanium and zirconium carbide. The preparation method of the double-nanostructure tungsten alloy comprises the following steps of: (1) raw material mixing: weighing the components according to the formula ratio, and performing ball milling in a protective atmosphere to realize alloying and nanocrystallization to obtain nanocrystalline alloy powder; and (2) sintering and forming: putting the nanocrystalline alloy powder obtained in the step (1) into a mold, and performing pressure sinteringto prepare the double-nanostructure tungsten alloy. The sizes of tungsten crystal grains and second phase dispersed particles in the double-nanostructure tungsten alloy are both nanoscale, and the double-nanostructure tungsten alloy has good hardness and high-temperature stability.

The invention provides a winding drum device for manufacturing firework and firecrackers paper drums. The device comprises a rack, the paper feeding mechanism arranged on the rack, an impression mechanism, a glue coating mechanism, a cutting mechanism and a winch mechanism, wherein the impression mechanism is used for impressing the roll paper into a corrugated shape, so that the amount of rolledpaper is reduced, and meanwhile, enough hardness of the rolled paper drums can be guaranteed; the glue coating mechanism comprises a hollow coating roller body and a brush layer which is arranged on the outer side wall of the coating roller body and is made of a flexible material and provided with a plurality of gaps; glue is fed into an inner cavity of the coating roller body through a glue conveying pipe, and the glue is uniformly smeared on the brush layer through a glue channel; finally, the brush layer is in contact with the roll paper, the glue coats the surface of the roll paper. The use amount of watering can be saved, and the glue can uniformly coat the roll paper as well, the rolled paper drums can be package from being adhered to one another, and the paper drums are easier to dry.

The invention relates to the technical field of mechanical transmission, and specifically relates to a conveying chain. The conveying chain comprises inner chain plates, outer chain plates, a pin shaft and a sleeve, wherein the pin shaft sequentially penetrates through the outer chain plate at a rear side, the inner chain plate at the rear side, the sleeve, the inner chain plate at a front side and the outer chain plate at the front side from the rear to the front; a high-hardness guide plate is welded and fixed to a side end surface away from the corresponding inner chain plate, of each outerchain plate; and welding layers are welded to the upper edges of each inner chain plate and the corresponding outer chain plate, heat dissipation windows are formed in each inner chain plate and thecorresponding outer chain plate, a step surface is machined at a rear end of the pin shaft, a retainer ring groove is machined in a front end of the pin shaft, and a locking retainer ring is installedin the retainer ring groove in a clamping manner. According to the conveying chain, the wear and the deformation of the chain plates is greatly reduced, and meanwhile, the service lives of the guideplate and the chain are effectively prolonged; and the conveying chain is worthy of being popularized and used.

The invention discloses a thermal treatment method of a 7CrSiMnMoV diameter expanding cone. The thermal treatment method comprises the following steps: (1) completing preparation operation, namely, plugging holes and grooves, and coating a high-temperature resisting anti-oxidation coating; (2) feeding the 7CrSiMnMoV diameter expanding cone into a tool of which the bottom is a plane in a manner that the large end of the 7CrSiMnMoV diameter expanding cone faces downwards, putting the tool into an atmosphere protection heating furnace, introducing nitrogen to expel air, and completing the furnace feeding operation; (3) controlling the heating speed and the temperature, introducing nitrogen, ammonia gas and methanol, and heating; (4) controlling the heating time, the temperature and the time, introducing nitrogen and methanol for protection, and austenitizing; (5) controlling the time and the temperature, and performing nitrate quenching; and (6) controlling the time and the temperature, and annealing. The 7CrSiMnMoV diameter expanding cone treated by using the thermal treatment method is free of defect such as quenching cracks and decarburization, parameters such as the quenching depth, the bending resistance, the pressure resistance, the impact toughness and the hardness, of the material of the cone, are remarkably improved, the requirements on mechanical processing are met, and no deformation is caused after mechanical processing.

The invention discloses a die material with high-temperature stability and high resistance to cold and hot fatigue. The die material is formed by combining a material with high resistance to cold and hot fatigue and a material with high-temperature stability, the material with the high resistance to the cold and hot fatigue is composed of high-speed steel rollers, the material with the high-temperature stability is composed of hot-working die steel which is formed by combining 4CrW2Si and 3Cr2W8V, and the high-speed steel rollers and the hot-working die steel are combined in a high-temperature fusing mode. By the mode, the die material can have the very high resistance to the cold and hot fatigue, and meanwhile at a high temperature, the stability of the die material can be kept, and hardness and strength of the die material will not decline.

The invention relates to a preparation method of a molybdenum-cobalt-nickel high-hardness high-strength alloy, which comprises the following steps: proportioning MoC-NiC compound carbide, MoC powder and Co powder, carrying out ball milling, drying, doping with a forming agent, carrying out pressure forming, sintering and the like. The weight ratio of NiC to MoC in the compound carbide is 30:70-40:60; and in the proportioning process, the content of Co is controlled at (7.2-7.7) wt%, and the MoC powder of (1.2-1.8) um is adopted. The preparation method of the molybdenum-cobalt-nickel high-hardness high-strength alloy can enhance the bending strength, thereby solving the problem of high tendency to cracking of the alloy cutter blade during welding and sharpening, the problem of high tendency to breaking when the alloy cutter blade is used for cutting, and the like.