103results about How to "Avoid brittle fracture" patented technology

Disclosed are a ligament-bone bionic support with an initial self-fixing function and a forming method of the support. The method includes: using a computer to design a bone support, using a fast forming technique to prepare a resin model of the bone support, and using the resin model as a core to prepare a negative silicon rubber mold of the bone support; using static spinning technology to prepare a directional ordered nano fiber film, and coiling the nano fiber film to form a nano fiber ligament support; matching and positioning the ligament support and the negative bone support, sequentially filling bone support material solution into the negative silicon rubber mold to obtain the bone support with the inherent initial self-fixing function; filing composite solution mixed with bone support materials and ligament support materials to form a transition layer; and performing post-treatment in a freeze drier to obtain the ligament-bone bionic support with the initial self-fixing function. By changing surface structures of the bone support, the bone support is allowed to be matched with autogenous bones, and initial fixing strength and stability are improved.

The invention belongs to the field of composite materials and in particular relates to a laminated metal chalcogenide (LMC)/carbon nanotube (CTNs) flexible compound film material of a highly ordered structure and a preparation method thereof. The composite material comprises an ultrathin self-supporting (transparent) CNTs film substrate and an LMC film which uniformly wraps the surface thereof to form the flexible composite film material which has a nanoscale porous structure and a three-dimensional network structure of a high electric channel. The preparation method comprises the following steps: providing an alloy bracket for bearing a self-supporting CNTs film and cleaning the carried CNTs film under a heating condition with plasma; and preparing the LMC/CNTs composite functional film material from the pre-treated CNTs film at an air pressure of 0.2-2Pa and at a temperature of 30-800 DEG C by virtue of a magnetron sputtered deposition technology. According to the material provided by the invention, a crispy laminated metal chalcogenide functional two-dimensional (2D) material and one-dimensional (1D) CNTs are effectively connected to form a three-dimensional (3D) network structure of structural flexibility.

The invention aims at providing a manufacturing method of a steel bar with an anchoring part. By adopting the manufacturing method, a diameter expansion part with proper shape can be practicably formed to be used as the anchoring part. The manufacturing method of the steel bar comprises the following procedures: an end area of a steel bar (10) is heated, and high-temperature upsetting processing is carried out: the end area to be heated is compressed in the axial direction to be deformed by increasing the outer diameter, thus a diameter expansion part (102) of the anchoring part is formed integrally; heating is carried out to continuously or periodically raise the temperature of the end area of the steel bar (10) with the approaching of an end face (10A), the temperature (T1) of a part away from 2.0D in the axial direction from the end face (10A) of the steel bar (10) is not less than 1300 DEG C which is less than the melting point of the steel bar, and the temperature (T2) of a part away from 5.0D in the axial direction from the end face (10A) of the steel bar (10) is not less than Ac3 phase-transition temperature of the steel bar and not more than 1200 DEG C.

Disclosed is base steel composite material used for the top of a seamless pipe machine and the preparation method thereof, belonging to the application field of metal tube mills. Combustion synthesis chemical reaction in a negative-pressure casting type die cavity can be utilized; a TiC porcelain-metal enhancing area with the thickness of 15-20 mm is formed at the nasal part at the front edge of the top; and the combination between the porcelain-metal enhancing area and the top is metallurgy combination. The technology is as follows: firstly, Ti powder, C powder and Ni powder are used as reactants, are evenly mixed according to certain proportion and are pressed into blank material; secondly, the pressed blank material after degasification is positioned at a corresponding position of the top needing enhancement in the negative-pressure casting type die cavity, and vacuum suction of a negative-pressure sand box is kept; high-temperature and hot-made mould steel liquid is poured into casting mould to ignite the chemical reaction in the pressed blank material to form TiC porcelain granules so as to prepare roughcast of the top casting; and thirdly, the roughcast of the top casting is performed with mechanical process of turning or grinding and the like so as to achieve the designing size requirement of the top.

The invention belongs to the field of petroleum and gas fracturing extraction and in particular relates to a graphene modified ultralow-density propping agent and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing graphene, an olefin monomer, a cross-linking agent (divinyl benzene) and an initiator under ultrasonic or stirring conditions so as to obtain a monomer mixture in which a Pi-Pi assembly effect is achieved between graphene and aromatic ring components; adding the monomer mixture into an aqueous solution of dispersing agents, performing the processes of balling, cross-linking and curing under the heating condition so as to obtain a microsphere precipitate; and filtering, washing and drying, thereby obtaining the graphene modified ultralow-density propping agent. According to the method disclosed by the invention, the organic polymer microsphere has low density, while the graphene has the performances of ultrahigh strength, high thermal conductivity and high temperature resistance, and then the composite material has ultralow density as well as the characteristics of high strength and high temperature resistance, so that the deep-well hydraulic fracturing requirement is met.

The invention discloses an environmental-friendly high-temperature-resistant cable material for a computer. The environmental-friendly high-temperature-resistant cable material is prepared from the following components in parts by weight: 50-80 parts of polytetrafluoroethylene, 0.4-0.9 part of polyphenylene sulfide, 0.5-1.5 parts of polybenzoate, 1-3 parts of rare earth stabilizer, 1-2 parts of coumarone resin, 10-16 parts of modified microcrystalline cellulose, 2-8 parts of nano-diamond particles, 1-2 parts of palm wax, 0.5-1.2 parts of antimonous oxide, 0.5-1.5 parts of phthalate (2-ethyl hexoate) ester, 1-3 parts of maleic anhydride, 1-2 parts of gamma-(quadrol) propyl emthyl dimethoxy silane, 0.5-1.2 parts of acrylonitrile-butadiene-styrol copolymer, 0.5-1.2 parts of benzoyl peroxide and 1-2 parts of butyl titanate. The environmental-friendly high-temperature-resistant cable material for the computer can resist high temperature and is excellent in mechanical property.

The invention discloses reactive high-viscosity liquid asphalt and a preparation method and application thereof. The reactive high-viscosity liquid asphalt contains, in parts by weight, 50-60 parts ofasphalt, 25-35 parts of an organic solvent and 15-25 parts of a modifier. A reactive high-viscosity liquid asphalt mixture which is obtained through mixing of the reactive high-viscosity liquid asphalt, an inorganic active powder curing agent and graded aggregate has the advantages of low cost, high strength, rapid strength development, convenient construction and a wide application range, can beused as a super-thin abrasion layer which is laid on an original pavement, and can also be applied to newly-built drainage pavements.

The invention relates to the field of coating and discloses a water-resistant net-flavor waterborne ceramic simulating coating and a preparation method thereof. The coating comprises the following components in parts by mass: 10-20 parts of calcite powder, 10-20 parts of heavy calcium carbonate powder, 8-12 parts of calcium carbonate, 2-4 parts of bletilla striata powder, 1-3 parts of corn starch, 0.5-1.5 parts of carboxymethyl cellulose, 0.5-1.5 parts of phenoxy resin, 0.5-1.5 parts of glutaraldehyde, 1-3 parts of air purifying particles and 45-55 parts of water. The water-resistant net-flavor waterborne ceramic simulating coating provided by the invention has the advantages of relatively good water resistance, air purifying function, large adsorption capacity, long purifying time and good air purifying effect.

The invention relates to a rolling technology for a pure tungsten sheet and a device thereof. An electric heating pipe is arranged in a roller; an electric heating platform is arranged at the front part on a rolling-in side of the roller; the top surface of the electric heating platform is located at a peak on the outer periphery of a lower roller; a roller wiper is arranged on a rolling-out side of the roller; and a temperature control device is used for controlling the temperatures of the electric heating pipe and the electric heating platform. According to the rolling technology, the rolling temperature of the tungsten sheet is strictly controlled, the electric heating platform is utilized to heat the to-be-rolled tungsten sheet, and meanwhile, the roller is heated and kept warm, thereby ensuring deformation of the tungsten sheet within a suitable plastic temperature range all the time during the whole rolling process, avoiding oxidization, greatly promoting the yield and realizing batch and low-cost production of ultrathin tungsten sheets.

The invention relates to a preparation method for a high-temperature lightweight tough mullite aggregate. According to the technical scheme, the preparation method comprises the following steps: mixing 40-65 parts of mullite powder, 5-25 parts of 94.5% silica powder, 20-55 parts of soft clay and 0.3-0.5 part of water reducer in parts by weight with water while stirring at a stirring rate of 500 rad/min, thereby fully mixing main materials and forming into a uniform slurry; adding 10-40 parts of foaming agent and 0.1-0.6 part of foam stabilizer into the uniform slurry. According to the invention, a manner of one-step foaming is combined with a unique stirring process, for fully and uniformly distributing the foaming agent into the slurry and lastly forming a foam slurry; the production process is simple and practicable; volume density of aggregate body is 0.5kg/m3-0.6kg/m3; volume density of sintered aggregate is 0.3kg/m3-0.4kg/m3.

The invention relates to a hard alloy tooth top square tooth type saw chain of a chain saw. The hard alloy tooth top square tooth type saw chain is characterized in that a small hard alloy tooth block is welded on a tooth top position of the saw chain, and a hard alloy square tooth type tooth top is formed. The hard alloy tooth block is made into a fan-shaped prism, most of the welding surface is a cylindrical surface, and the circular arc radius of the cylindrical surface is 2 to 4mm, and is preferably 2.5 to 3.5mm. The hard alloy tooth top square tooth type saw chain adopts a butt welding method for welding the hard alloy tooth block with cutting teeth, the hard alloy tooth block and the cutting teeth are in directly contact and butt fusion, no middle layer is formed, the connecting intensity of welding seams is improved by 4 times through being compared with that of brazing, and the firmness is high. The heat treatment is carried out after the tooth block welding, the welding brittleness of the cutting tooth body behind the welding seams is eliminated, and the brittleness fracture of the cutting tooth body during the sawing can be prevented. Finally, the hard alloy tooth top and the cutting teeth are simultaneously subjected to tooth grinding, and the optimum consistent square tooth type corners are obtained.

The invention discloses a magneto-rheological polishing machine for inner and outer surfaces of a ceramic short pipe. The machine comprises a workbench, as well as a polishing part, stepping motors, aclamping rotating mechanism and a magneto-rheological fluid supply mechanism which are arranged on the workbench, wherein the polishing part comprises a first polishing part body and a second polishing part body which are driven by the stepping motors to rotate oppositely correspondingly, inner polishing heads and outer polishing heads rotate oppositely (namely the first polishing part and the second polishing part rotate oppositely), and the ceramic pipe is clamped on a saddle to rotate in a reciprocating mode, so that the ceramic pipe and the polishing heads (including the polishing heads Aand the polishing heads B) move relatively, the inner and outer surfaces of the ceramic pipe are polished at the same time, high-efficiency polishing of the ceramic pipe is achieved, and high-precision positioning of the ceramic pipe is achieved.

The invention discloses an environmental-friendly waterproof cable material for a computer. The environmental-friendly waterproof cable material is prepared from the following components in parts by weight: 50-80 parts of polytetrafluoroethylene, 1-2 parts of nilox resin, 0.4-0.9 part of polyphenylene sulfide, 0.5-1.5 parts of polybenzoate, 1-3 parts of magnesium stearate, 0.5-1.2 parts of antimonous oxide, 1-2 parts of C5 petroleum resin, 0.5-1.5 parts of coal tar, 2-8 parts of nanometer talcum powder, 10-16 parts of modified microcrystalline cellulose, 0.5-1.2 parts of di-tert-butyl peroxide, 0.5-1.2 parts of 2,4-dichloro benzoyl peroxide, 1-3 parts of maleic anhydride, 1-2 parts of gamma-(quadrol) propyl emthyl dimethoxy silane and 1-2 parts of butyl titanate. The environmental-friendly waterproof cable material achieves environmental friendliness, is good in water resistance and flame resistance and is excellent in mechanical property.

The invention belongs to the technical field of coal mill equipment, and particularly relates to a high-efficiency ceramic grinding roller and a ceramic lining plate. A grinding mechanism with the relative movement function is formed by the ceramic grinding roller and the ceramic lining plate. The ceramic grinding roller comprises a grinding roller base body, an adhesive layer and a composite ceramic layer. The ceramic lining plate comprises a lining plate base body, an adhesive layer and a composite ceramic layer. Materials of the composite ceramic layers are formed by one or more of silicon carbide, silicon nitride, tungsten carbide, aluminum oxide and zirconium oxide in a compounded mode. The adhesive layers are adhesives resistant to high temperature and high in viscidity. The grinding roller base body and the lining plate base body are made of metal. The composite ceramic layer of the ceramic grinding roller is formed by splicing ceramic modules. Gaps capable of increasing the surface friction force of ceramic are formed between the ceramic modules. The high-efficiency ceramic grinding roller and the ceramic lining plate are simple in structure, reasonable in design, high in hardness, long in service life, economical, practicable and easy to apply and popularize on a large scale, and the cost is reduced.

The invention discloses a flame-retardant and waterproof coal mine cable material having excellent mechanical properties. The flame-retardant and waterproof coal mine cable material is prepared from, by weight, 15-35 parts of polypropylene, 30-50 parts of ethylene propylene diene monomer rubber, 20-40 parts of neoprene, 1-2 parts of maleic anhydride grafted polyethylene, 1-2 parts of maleic anhydride, 0.2-0.8 part of butyl titanate, 0.5-1 part of dicumyl peroxide, 0.2-0.8 part of triazole disulfydryl amine salt, 0.5-1.5 parts of magnesium stearate, 1-2 parts of antimonous oxide, 0.5-1.5 parts of polyethylene wax, 1-2 parts of barium stearate, 10-25 parts of a modified soybean adhesive, 20-40 parts of zinc borate, 20-40 parts of magnesium hydroxide, 5-15 parts of nano talcum powder and 10-16 parts of microcrystalline cellulose. The flame-retardant and waterproof coal mine cable material is flame-retardant and waterproof and has good mechanical properties and economic benefits.

The invention discloses a steel structure beam column connection node and a connection method thereof in order to solve the problem that an existing connection node is prone to brittle fracture. The steel structure beam column connection node is used for connection between a steel column and I-shaped steel beams. The steel beams and the steel column are connected through a corbel. The corbel is anenclosing structure formed by welding a plurality of modules of the same structure to the steel column. Each module is of a Y-shaped structure composed of two fixed plates and a steel wing plate, wherein a plug space is formed between the two opposite steel wing plates. Each connecting part comprises at least one plug plate welded to the end of one steel beam. The plug plates are plugged into theplug spaces. The steel wing plates and the plug plates are connected through mounting holes and high-strength bolt assemblies. The steel beams and the corbel are preliminarily positioned in a plug-inmode and are in rigid connection or semi-rigid connection through high-strength connecting assemblies. The steel structure beam column connection node is easy to assemble and capable of realizing full-assembly installation.

The invention discloses a sealing part for an automobile LED instrument panel. The sealing part is prepared from raw materials in parts by weight as follows: 50-60 parts of a main material, 0.5-1.2 parts of disproportionated rosin, 1-2 parts of polyphenylene sulfide, 0.4-1 part of polybenzoate, 55-65 parts of filler, 0.2-1 part of di-tert-butyl peroxide, 1-2 parts of 2,4-dichlorobenzoyl peroxide, 0.4-1 part of maleic anhydride, 0.2-0.8 parts of 3-(2-aminoethylamino)propyl-dimethoxymethylsilane, 0.4-1 part of butyl titanate, 1-3 parts of magnesium stearate, 1-2 parts of coal tar and 1-3 parts of an anti-aging agent. The sealing part for the automobile LED instrument panel has high density, good toughness, extremely high waterproof performance and excellent tearing resistance.

The invention discloses a multifunctional precision sliding table saw for a laboratory and a using method of the multifunctional precision sliding table saw. The problem that an existing sliding table saw cannot achieve rapid size measurement, precision cutting and safety is solved. The multifunctional precision sliding table saw for the laboratory is composed of a workbench, a guiding rule, a rotary nut, a first fixing frame, a buckle spanner, a guide screw rod, a first fixing block, a fixing rod, an electronic digital display caliper, a second fixing block, a second fixing frame, a knife saw shell, a pneumatic compression device, a third fixing frame, a guide nut, a third fixing frame and a sliding table saw box body. The using method comprises the steps that 1, a contour to be cut is drawn on a plate at first; 2, the contour line on one side of the plate overlaps with a circular saw web and is laid; 3, the pneumatic compression device is started, the buckle spanner is moved away, the guiding rule moves along the guide screw rod to the edge of the plate, and then the guide nut is rotated to enable the guiding rule to be tightly attached to the plate; 4, the rotating speed of the circular saw web is adjusted; and 5, the workbench is pushed to move along a sliding groove to cut the plate.