44results about How to "No surface cracks" patented technology

The invention discloses porcelainized fireproof and heat insulation foamed silicone rubber and a preparation method thereof. The rubber comprises the following raw materials in parts by weight: 100 parts of base rubber, 10 to 60 parts of porcelain forming filler, 0.1 to 0.5 part of a platinum catalyst, 0.5 to 1.5 parts of silicone oil, 2 to 10 parts of a foaming agent, 0.1 to 0.5 part of a vulcanizing agent, and 0.1 to 0.4 part of a vulcanization accelerator. The foamed silicone rubber has good ceramic effect, does not have surface cracks, is hard in texture, keeps a complete foam structure, ensures that the volume retention rate is 85% or higher, and is excellent in fireproof performance.

The invention relates to a friction stir welding method of a medium plate AZ AZ1 magnesium alloy, belongs to the technical field of welding process used in material processing projects, and particularly provides a friction stir welding method of a 10 to 20-millimeter-thick AZ31 magnesium alloy. The welding inclined angle of a stirring head is 2.5 to 3 DEG, the pressing depth is 0.1 to 0.2 millimeter, the rotation speed is 600 to 1,400r/min, and the welding speed is 100 to 200 mm/min; the shaft shoulder of the stirring head is concave and a stirring pin is frustum-shaped and spiral; the diameter of the shaft shoulder of the stirring head is 28 to 35 millimeters; the diameter of the root part of the stirring pin is 10.3 to 15.1 millimeters, and the diameter of the end part of the stirring pin is 7.8 to 9.3 millimeters; and the length of the stirring pin is 9.6 to 19.5 millimeter. By selecting reasonable welding parameters, the obtained joint is formed elegantly, the maximum tensile strength is up to 94.7 percent of that of a parent metal, and the well welding of the medium plate AZ AZ1 magnesium alloy.

The invention provides strengthening steel shot, and relates to a metal product, in particular to blast shot used for metal surface treatment. The steel shot is characterized in that the steel shot comprises the following components by the weight percentage as follows: 0.45 to 0.85 percent of carbon, 0.30 to 1.30 percent of manganese, 0.15 to 0.35 percent of silicon, sulfur less than or equal to 0.050 percent, and phosphorus less than or equal to 0.040 percent, with iron and inevitable impurities in balancing amount; the average hardness determined under a load is 640HV plus or minus 30HV, and the hardness deviation range is plus or minus 25HV. The strengthening steel shot has the advantages of high consistency of the proportion between the density and elements, smaller hardness deviation ratio, no hollow core and surface crack phenomena, small surface shape difference, high surface strength and good durability. Furthermore, the strengthening steel shot is particularly suitable for surface treatment of high-level workpieces.

The invention discloses a metal-based material for the preparation of a crystallizer or a tuyere and belongs to the technical field of surface engineering. According to the metal-based material, a transition layer is innovatively arranged between a Cu or Cu alloy matrix and a high-abrasion-resistance working layer by the adoption of a metallurgical bonding method, and made of at least one of pureCo metal, pure Ni metal, pure Cr metal, pure Cu metal, pure Mo metal, pure Ag metal and a NiCr or MCrAlY alloy; through the transition layer, the functions of improving the laser absorption rate, lowering the matrix heat conductivity, and lowering the dilution rate can be achieved; due to the existence of the transition layer, the thickness of the working layer can be adjusted within a range of 0.01-3 mm and the formation of surface cracks can be avoided; furthermore, the ratio of the thickness of the transition layer to that of the high-abrasion-resistance working layer is 1:(1-3), so that the perfect bonding of the transition layer and the high-abrasion-resistance working layer can be guaranteed within the ratio range; the formation of a high-abrasion-resistance coating or coating product which is free of surface cracks and subjected to metallurgical bonding on the Cu or Cu alloy matrix can be improved; the reliability of the crystallizer or the tuyere can be improved; and the service life of the crystallizer or the tuyere can be prolonged.

A method for manufacturing a reinforced steel shot relates to a method for manufacturing metal products, particularly to a method for manufacturing the reinforced steel shot used for the metal surface treatment. The method for manufacturing the reinforced steel shot comprises the following process flow: selecting a material, drawing wires, cutting, screening, detecting and storing; or selecting a material, drawing wires, cutting, rounding and reinforcing the surface, screening, detecting, and storing. Since the reinforced steel shot is made of a sectional material, namely a spring steel wire, which is in accordance with requirements of the elementary composition proportion and the hardness deviation range, the density and the consistence of element proportion of the reinforced steel shot are high. Since a novel process is adopted, the reinforced steel shot has the advantages of no occurrence of hollow and surface cracking phenomena, small difference of surface shapes, high surface strength and long service life. The produced reinforced steel shot by using the method is particularly suitable for the high-end workpiece surface treatment.

The invention discloses a cold-charge heating method of a bearing steel continuous casting billet, which comprises a preheating section I, a preheating section II, a heating section I, a heating section II and a soaking section. On the premise of not generating overburning and surface crack and ensuring the carbide uniformity to reach the standard, the method satisfies the cold-charge heating and rolling production of the bearing steel continuous casting billet.

The invention discloses a corrosion-resistant high-strength support/hanger assembly. The support/hanger assembly comprises a tube clamp and a connecting part arranged at the lower end part of the tube clamp, wherein the tube clamp comprises two clamp pliers which are in the same shape and are symmetrically arranged; each clamp plier comprises a connecting end, a circular arc section and a clamping section; the connecting ends of the two clamping pliers are connected together in a rotating manner; the arc mouth ends of the circular arc sections of the two clap pliers are oppositely arranged; fastening holes are respectively formed in the clamping sections of the two clamp pliers, and the two fastening holes correspond to each other. The invention further discloses a manufacturing technology of the corrosion-resistant high-strength support/hanger assembly. The support/hanger assembly disclosed by the invention is simple and reasonable in tube clamp structure, scientific in design, high in strength, hardness and toughness, resistant to acid and alkaline corrosion, not liable to deform under high temperature and high pressure, and long in service life.

The invention provides a sleeve grouting material for steel bar connection and a preparation method and application thereof.The sleeve grouting material is composed of a component A and a component B.The component A is dry powder and comprises, by mass, 400-600 parts of cement, 10-40 parts of mineral admixture, 400-600 parts of sand, 0.2-3.0 parts of plastic expanding agent, 15-25 parts of expanding agent, 1-3 parts of water reducing agent, 0.2-1.0 part of defoaming agent, 0.1-1.0 part of stabilizer, 0-10 parts of antifreezing agent, 0-5 parts of an early strength agent, and 0-5 parts of a retarder; and the component B is water and comprises, in parts by mass, 120-170 parts of water. The sleeve grouting material has the characteristics of high fluidity, micro-expansion, high strength andthe like, and can be suitable for construction at different temperatures (-5 to 10 DEG C) and normal temperature (higher than 10 DEG C).

The invention relates to a cold rolling and annealing preparation method of a high-tungsten high-cobalt nickel alloy ultra-fine grain panel, and belongs to the technical field of metal materials. An alloy is prepared from the components in percentage by weight: 25 to 45 percent of tungsten, 15 to 25 percent of cobalt, and the balance nickel and residual elements. The method comprises the preparation processes of adopting a cold rolling and annealing alternate repeating deformation path, wherein the cold-rolling deformation amount per pass is 20 to 45 percent, and the cold-rolling deformation amount of the last pass is larger than or equal to 25 percent; and annealing a panel veneer cold-rolled per pass in the middle, wherein the annealing temperature is 850 to 1100 DEG C, and the annealingtime is 30 to 150min. According to the cold rolling and annealing preparation method of the high-tungsten high-cobalt nickel alloy ultra-fine grain panel provided by the invention, the high-tungstenhigh-cobalt nickel alloy ultra-fine grain panel is prepared through a cold rolling and annealing way; and the obtained panel is uniform in deformation, has no defect such as surface cracks, has a tinyinner grain structure with the grain size grade being not lower than 7 grade, has an ideal microscopic structure and an excellent mechanical property in each direction, has a grain size grade difference not exceeding 2 grades, has the ductility reaching to 76 percent, the tensile strength reaching to 995MPa and the yield strength reaching to 588MPa, and is capable of meeting the requirements of multiple product production processes such as follow-up die forging, rocking-rolling, punching and spinning on the panel.

The invention provides a manufacturing method for a seamless steel tube for a large-caliber high-pressure boiler. After an 820 oblique rolling unit is used for perforating, a pierced billet is rolled,an intermediate-frequency heat expanding unit is used for expanding, heat treatment is conducted, and a hydraulic straightener and a six-roller straightener are utilized for two-step straightening and circle tidying. The high-pressure boiler seamless steel tube manufactured through the method can reach following indexes that the outer diameter is 840-1,220 mm, the wall thickness is 25-120 mm, andthe maximum length is 14 mm; and the outer diameter tolerance is +/-1.0%, the inner diameter tolerance is +/-0.75%, the wall thickness tolerance is +/-10%, the straightness is smaller than 1.5 mm/m,and the ovality is smaller than 1.0% of the average diameter.

The present invention provides a kind of metallic mold scheme and the die casting method for magnesium alloy using the same that the metallic mold scheme is applied to die casting for magnesium alloy or metal injection molding. The invention is characterized that it provides a plurality of vertical gates and configured with horizontal runners from vertical runners to each gates; and, the distances of non-gating portion between neighbored gates are set to under 10 mm except that the product design was not allowed for this setting. The die casting method using the disclosed metallic mold scheme can be applied to thin-wall die casting, especially for the thin-wall die casting with thickness under 1.5 mm or for the alloy casting containing silicon, rare earth elements, calcium. The die casting product from the invented method will have no wrinkles, surface cracks, insufficient filling, and without mold adherence.

The invention discloses double-plant-based coconut milk non-dairy cream and a preparation method thereof. The double-plant-based coconut milk non-dairy cream comprises the following components in percentage by weight: 22%-28% of sugar, 10%-18% of vegetable fat, 3%-6% of coconut milk, 1%-1.8% of an emulsifier, 0.2%-1.2% of a thickener, 0.01%-0.5% of a stabilizer, 0.08%-0.5% of table salt, 0-0.5% ofedible essence and the balance of drinking water. The coconut milk and the vegetable fat are combined to prepare the double-plant-based cream, and the double-plant-based cream has rich natural coconut fragrance, tastes pure and soft, contains a proper amount of fat, a large amount of vegetable proteins and nutrient substances, and meets diversified taste requirements on the market. The double-plant-based coconut milk non-dairy cream prepared by the preparation method has the advantages of strong coconut fragrance, good whipping performance and good stability, and is suitable for industrial production.

The invention discloses a sea salt-cheese milk-containing non-dairy cream and a preparation method thereof, wherein the sea salt-cheese milk-containing non-dairy cream is composed of the following rawmaterials by the weight percentage: 22%-28% of sugar, 12%-18% of vegetable oil, 1%-5% of milk fat, 1%-5% of cheese, 1%-4% of condensed milk, 1.0%-1.8% of an emulsifier, 0.3%-1.2% of a thickener, 0.05%-0.2% of a stabilizer, 0%-0.1% of a coloring agent, 0.08%-0.5% of sea salt, 0%-0.5% of an edible essence, and water added to make the total amount to 100%. The sea salt and cheese ingredients are added on the basis of milk fat-containing non-dairy cream, so that the sea salt-cheese milk-containing non-dairy cream has unique sea salt and cheese flavor, meets the diversified taste demand on the market, has good comprehensive performance and good stability after standing, and is also suitable for industrial production and transportation.

A nickel base projectile and a preparation method thereof. The product is mainly used in surface strengthening of high-end nickel base components for aerospace, aircraft turbine blade and nuclear power component. The nickel base projectile comprises 75.25-83.25% of nickel, 14.75-22.75% of chrome, and the balance of iron and unavoidable impurities. The product has a tested average hardness of 340HV+/- 20HV in load; and the product is prepared by a method comprising steps of: material selection for nickel base wire rod, heat treatment wire drawing, cutting, surface grinding hardening, heat treatment, screening, detection, packaging and storage.

The invention relates to a preparation method of foamed silicone rubber, and belongs to the field of material preparation. The preparation method is characterized by comprising the following steps of:weighing 100g of rubber compound prepared from methyl vinyl silicone rubber, carrying out mill mixing in a two-roll mixing mill at a room temperature, wrapping rolls with silicone rubber, then adding10-60g of glass fiber powder, a platinum catalyst, 0.2-1.0g of hydrogen-containing silicone oil, and 0-0.8g of hydroxy silicone oil; mixing evenly, and discharging a sheet; and flatly paving, puttingin an aging testing machine for vulcanization, simultaneously foaming, setting the temperature to be 240 DEG C and time to be 5 minutes, and completing the preparation of the foamed silicone rubber.The fire-retardant foamed silicone rubber which can be ceramized at a high temperature is prepared by vulcanization carried out through hydrosilylation reaction and foaming carried out through siliconhydrogen dehydrogenation reaction. After the foamed silicone rubber is fired at the temperature of 1000 DEG C for 30rain, the foamed silicone rubber has good ceramicization effect and hard texture without surface cracks, the cellular structure is kept perfectly, the volume retention rate is above 85%, and the fireproof performance is excellent.

The invention aims to provide a Q1100D ultrahigh-strength steel casting method, which mainly adopts technical measures from casting of a casting machine, avoids surface cracks of an ultrahigh-strength steel casting blank, improves the center segregation control level of the ultrahigh-strength steel casting blank, and achieves the purpose of ensuring that all performances of a steel plate rolled by the casting blank are qualified.

The invention relates to a bidirectional disconnection type titanium alloy sheet spring, belonging to the technical field of springs. The bidirectional disconnection type titanium alloy sheet spring comprises a titanium alloy sheet and is characterized in that the titanium alloy sheet is provided with an upper spiral cutting region and a lower spiral cutting region, wherein the upper spiral cutting region and the lower spiral cutting region are respectively provided with an upper spiral spring and a lower spiral spring. The bidirectional disconnection type titanium alloy sheet spring disclosed by the invention is of a reasonable and simple structure, is easy to produce and manufacture, and has good usability. Compared with the traditional titanium alloy sheet spring, the bidirectional disconnection type titanium alloy sheet spring disclosed by the invention has the advantages of high surface glossiness, no hidden surface crack, no fatigue break, and durability in use; and the spring is high in the size precision and tensile strength; the bidirectional disconnection type titanium alloy sheet spring is molded at one time through a bidirectional compound stretch drawing die, the deformation coefficient of the spring is reduced to a very small range, the yield of finished product of the spring is greatly improved, the batch production is facilitated, the production efficiency is remarkably improved, and the requirements of the titanium alloy sheet spring for an intelligent drilling rod in a vertical drilling system can be met.

The invention relates to the technical field of fuel cell catalyst layer preparation, in particular to a flawless proton exchange membrane directly coated with a catalyst and a preparation method and application thereof. The preparation method comprises the following steps: mixing a perfluorosulfonic acid solution, normal propyl alcohol and deionized water to obtain dispersion liquid; wetting a catalyst with deionized water, then mixing the catalyst with the dispersion liquid, and carrying out ultrasonic dispersion treatment to form primary dispersion catalyst slurry; performing high-shear dispersion on the primary dispersed catalyst slurry to obtain secondary dispersed catalyst slurry; and finally, carrying out single-layer coating by adopting a blade coating process to obtain the flawless proton exchange membrane directly coated with the catalyst. Compared with the prior art, the fuel cell catalyst layer manufactured by the method is uniform in thickness, good in consistency and free of surface cracks, catalyst layers with different thicknesses can be manufactured according to different catalyst feeding amounts, and the method is suitable for production of domestic fuel cell membrane electrodes.