98results about How to "Moderate mechanical properties" patented technology

The invention relates to a carbon-ceramic composite brake disc and a preparation method thereof and belongs to the technical field of preparation of carbon-ceramic composites and brake discs. The carbon-ceramic composite brake disc comprises the following components by mass percent: 12% to 20% of short carbon fiber, 20% to 45% of matrix carbon, 30% to 55% of SiC and 2% to 6% of Si, wherein the short carbon fiber is 15-30mm in length. The method comprises the following steps: carbonizing a carbon fiber-reinforced blank body with the density of 0.9g/cm<3> to 1.3g/cm<3> so as to obtain a porous carbon/carbon (C/C) body; then performing dipping on the porous C/C body, cross-linking solidification and splitting decomposition so as to generate a SiC base body on the matrix carbon; performing the dipping, the cross-linking solidification and the splitting decomposition again until the density of an obtained C/C-SiC composite blank body reaches 1.6-1.9g/cm<3>; and performing silicon leaching treatment on the C/C-SiC composite blank body and anti-oxidation treatment and assembling, thus obtaining the carbon-ceramic composite brake disc. According to the method provided by the invention, the difficult problem that a metal brake disc is poor in thermal dissipation and abrasion resistance and heavy in weight in the prior art is effectively solved. The preparation method is simple; and the obtained carbon-ceramic composite brake disc is high in thermal stability, light in weight and resistant to abrasion, and cannot generate thermal vibration.

The invention relates to a cement emulsified bitumen mortar for vertical connecting plate type ballastless rails, which comprises the following components in portion by weight: 1,370 to 1,516 portions of dry material, 230 to 270 portions of emulsified bitumen, 0 to 68 portions of polymer emulsion, 162 to 210 portions of water, 0.5 to 5 portions of water reducing agent, and 0 to 4 portions of antifoaming agent. The cement emulsified bitumen mortar has the advantages of good environment adaptability and working performance, agreeable mechanical property, small shrinkage, good crack resistance and superior lasting quality, is the cement emulsified bitumen mortar with high elasticity modulus, and can satisfy the requirements on different construction and use environmental conditions of the vertical connecting plate type ballastless rails for high speed railways and passenger dedicated lines in China.

The invention relates to a preparation method of a magnesium alloy/hydroxyapatite composite, which comprises the steps of firstly preparing nano hydroxyapatite powder by a sol-gel process, and then uniformly mixing the magnesium powder with the nano hydroxyapatite powder; putting the mixture into a mould and performing cold pressing; putting the cold-pressing formed sample into a vacuum heat treatment furnace for sintering to obtain the magnesium alloy/hydroxyapatite composite. Compared with the prior art, in the method provided by the invention, the magnesium alloy is used as a metal matrix, the hydroxyapatite with the same chemical composition as the human skeleton and having low solubility in the human body environment is used as a reinforcing body, and the method aims at preparing a magnesium alloy/calcium phosphate composite biomedical material by use of a powder metallurgical process; the material is mainly applied to clinical medicine as a degradable endosteal fixing material, a porous bone repair material, a dental implantation material, an oral repair material, a cardiovascular stent and the like, and has broad prospects in terms of bone tissue defect repair.

The invention discloses a hot rolling method for a wide and thin size high-strength cold-rolled base plate for an automobile. After continuous casting billets are assembled in a heating furnace in a hot state, the Cu accumulation amount of iron oxide scales and steel substrates is reduced by adopting high-temperature preheating and high-temperature rapid heating technologies; after rough rolling, the thickness of an intermediate billet is reduced, a heat holding cover is used for reducing temperature drop and temperature differences of all parts, so that the finish rolling entry temperature of the intermediate billet is increased; and loads of all racks for finish rolling are reduced, and the stability of finish rolling is improved. In the process from finish rolling to steel belt coiling, a controlled rolling and controlled cooling technology is adopted, so that the cold-rolled base plate has excellent uniformity between the shape and the structure property. According to the method, the cold-rolled base plate with the thickness of 1.5-2.5 mm and the width of 1650-2000 mm can be obtained; the convexity degree of a steel belt is controlled to be in a range between 45-15 mu m and 45+15 mu m; the straightness is controlled to be 30I; the thickness accuracy is in a range between -30 mu m and +30 mu m; the structure property of different edges of the head, the middle, the tail of the steel belt is uniform; and the yield and the production efficiency of the wide and thin size high-strength cold-rolled base plate can be increased and improved, so that the cold-rolled base plate meeting the requirements of the actual product quality and the performance is provided for steel plates with the grade of 450-590 MPa for automobile covering parts.

The invention discloses a preparation method of aloe/sodium alginate double-layer hydrogel dressing. The method includes: adding plasticizer glycerol into sodium alginate aqueous solution, stirring, performing ultrasonic treatment, standing at room temperature to obtain sodium alginate gel, dripping the sodium alginate gel into a culture dish, and drying to obtain a sodium alginate substrate layer; adding aloe aqueous solution into the sodium alginate aqueous solution, stirring, performing ultrasonic treatment, and standing at room temperature to obtain aloe/sodium alginate mixed gel; dripping the aloe/sodium alginate mixed gel on the surface of the sodium alginate substrate layer, and drying; soaking the double-layer hydrogel film into CaCl2 solution for 5-20 minutes, then washing with distilled water, and drying to obtain the aloe/sodium alginate double-layer hydrogel dressing. The method has the advantages that the hydrogel dressing with high transparency and swelling rate is prepared through the simple method, and the prepared dressing has excellent antibacterial performance, can promote fibroblast proliferation ability, and has weak sensitization and no irritation to the skin.

The present invention relates to a polarized light board structure which is provided with a polarized light layer, a first optical film and a second optical film, the first optical film is formed above the polarized light layer and the second optical film is formed below the polarized light layer, wherein, at least one optical film selected from the first optical film and the second optical film is polymethyl methacrylate optical film. Into the bargain, the optical film is formed by pasting the mixed solution to the polarized light board and doing heat treatment when penetrating the mixed solution and distributing on the substrate to prepare for making have finished, or the optical film is formed by penetrating the mixed solution and distributing on the substrate and doing thermal treatment.

The invention discloses a composite hydrogel for promoting bone repair. The composite hydrogel is prepared from the following components; methacrylic acid modified gelatin and dopamine modified sodiumalginate. In the composite hydrogel, the content of the methacrylic acid modified gelatin is 8-12% w/v, and the content of the dopamine modified sodium alginate is 0.5% w/v-2% w/v. A molecular structure of the dopamine modified sodium alginate contains a catechol structure, and the adhesion property is excellent. The composite hydrogel uses the methacrylic acid modified gelatin as a substrate ofthe hydrogel, and the mechanical properties and adhesion properties of the hydrogel are improved by incorporating the dopamine modified sodium alginate, so that the viscosity is excellent, the softness degree and elasticity are suitable, and the composite hydrogel is suitable for bone repair treatment. The results of in vitro experiments show that the composite hydrogel can load and slowly releasebiologically active factors and/or drugs that promote bone repair, good repair effect can be presented in bone defect models, and the healing of bone defect wounds can be significantly promoted.

The invention discloses a device for removing dust on papers before printing of printed matters and relates to the technical field of printing. The device comprises a paper conveying table, a primarydust removing mechanism, a secondary dust removing mechanism and dust removing mechanism installing platforms, wherein the dust removing mechanism installing platforms are symmetrically arranged at two sides of the paper conveying table; the primary dust removing mechanism comprises a positive-pressure air blower, a negative-pressure induced draft fan and a settling chamber; a trumpet-shaped air outlet is formed in the positive-pressure air blower; a trumpet-shaped air inlet is formed in the negative-pressure induced draft fan; both the positive-pressure air blower and the negative-pressure induced draft fan face toward the upper surfaces of the papers; the negative-pressure induced draft fan is connected with the settling chamber through an air supply pipe; the secondary dust removing mechanism comprises a roll shaft, a roller sleeving on the roll shaft and a dust removing brush cylinder sleeving on the roller; two ends of the roll shaft are arranged on the dust removing mechanism installing platforms through supports; and the outer edge of the dust removing brush cylinder is in contact with the upper surfaces of the papers. The device disclosed by the invention has the advantagesthat the dust on the papers can be effectively removed and the removing rate is up to more than 99%, so that the normal printing of the papers is prevented from being influenced by the dust.

The invention discloses a resin matrix applicable to microwave curing and a preparation method of the resin matrix, and belongs to the field of preparation of composite materials. Polar mulfunctional high-performance epoxy resin is used as main body resin; an active diluent is added to adjust the viscosity of a resin system so as to enable the resin to adapt to liquid forming processes such as winding; a novel compound curing agent is selected to adjust the curing activity of the resin matrix, and nanofiller is added to improve the microwave responsiveness of the resin matrix and realize the mechanical property, the heat resistance and the size stability of the resin matrix; by the adjustment of the structures and the proportions of components such as the main body resin, the curing agent, the diluent and the nanofiller, the resin system which is proper in microwave responsiveness and curing activity, excellent in comprehensive mechanical property, high in heat resistance, high in size stability and low in viscosity and is applicable to microwave curing is developed, has a great guidance significance for preparation of a fiber composite material, and can be widely applied to the field of aerospaces and the like.

The invention discloses a mesoporous calcium magnesium silicate/polylactic acid composite material as well as a preparation method and a use thereof. The preparation method comprises the steps of drying raw materials, evenly mixing, carrying out melt blending and then molding, wherein the raw materials include 1-50wt% of mesoporous calcium magnesium silicate and 50-99wt% of polylactic acid. The preparation method of the mesoporous calcium magnesium silicate/polylactic acid composite material is simple in process, and the obtained mesoporous calcium magnesium silicate/polylactic acid composite material contains no other toxic small molecules and impurities, and has excellent biological activity and compatibility and appropriate mechanical properties; besides, the ratio of the mesoporous calcium magnesium silicate to the polylactic acid in the mesoporous calcium magnesium silicate/polylactic acid composite material is adjusted to meet the requirement on different degradation velocities of implant materials in different bone repair environments.

The invention belongs to the field of material mechanical property test, particularly relates to an infrared heating furnace device for heating a material sample in an infrared way, solves the problems that temperature change test is difficult to finish, the heating temperature of a low end is unstable, and the like, and is used for searching the material mechanical property under the conditions of constant temperature and changed temperature. The device is provided with furnace bodies with elliptical cylindrical reflection, infrared heating lamps and temperature controllers, wherein the focusof the elliptical cylindrical surface of each furnace body is provided with an infrared heating lamp; the input ends of the temperature controller are connected with temperature thermocouples extending into the furnace bodies, and the output ends of the temperature controllers are connected to all the infrared heating lamps. The invention is suitable for testing the mechanical properties of a material under different temperatures and continuous changed temperatures and realizes mechanical property test and thermal mechanical property test on the material sample through rapidly heating the material sample to the teat temperature so as to search a method for improving the material property.

The invention provides a rubber floor cloth composition for preparation of rubber floor cloth. The composition is prepared from, by weight, 50-70 parts of EPDM (ethylene propylene diene monomer) rubber, 30-50 parts of POE (polyolefin elastomer), 2-8 parts of BIPB (Bis(tert-butylperoxy Isopropyl)benzene), 120-170 parts of silane modified magnesium hydrate, 20-50 parts of expanded vermiculite and 20-40 parts of silane modified white carbon black, wherein the sum of weight parts of the EPDM and the POE is 100. The invention further provides application of the composition to preparation of the rubber floor cloth, a preparation method of the rubber floor cloth with the composition serving as a raw material and application of the rubber floor cloth to railway vehicles. The rubber floor cloth has advantages of thickness uniformity, high strength, low volatile matter content, nontoxicity, safety and the like.

The invention relates to a magnesium/hydroxyapatite composite material and a preparation method thereof. The magnesium/hydroxyapatite composite material is prepared by mixing magnesium and hydroxyapatite serving as raw materials in a mass ratio of 80.5-99.9 percent: 0.1-19.5 percent for molding and sintering the mixture in a vacuum microwave sintering furnace. The composite material provided by the invention has proper mechanical property and can meet the requirements on human body bone tissue materials. A microwave sintering method is adopted, so the method has the advantages of high temperature rise speed, short sintering time, short preparation period, low energy consumption and no pollution.

The present disclosure relates to a composite material comprising glass fiber and a polymer blend comprising polylactic acid (PLA) and polybutylene succinate (PBS), wherein the composite material comprises about 10 wt-% to about 80 wt-% of glass fibre, and wherein the polymer blend comprises about 20 wt-% to about 60 wt-% of PLA and about 40 wt-% to about 80 wt-% of PBS. The disclosure also relates to an article comprising the reinforced composite material.

The invention discloses a piezoelectric composite material capable of being subjected to 3D printing/hot press molding and a preparation method thereof. The piezoelectric composite material comprises the following components: surface modified barium titanate and a polymer. The surface modified barium titanate provided by the invention has excellent biocompatibility, and the piezoelectric composite material which can be formed by the surface modified barium titanate and a polymer and can be subjected to 3D printing/hot press molding has moderate piezoelectric property and mechanical property; the piezoelectric composite material is obtained by mixing the surface-modified barium titanate with the polymer and then carrying out processing molding and electric polarization, and the piezoelectric composite material is simple in preparation process, mild in condition, low in cost and suitable for industrial batch production; the piezoelectric composite material can be widely applied to the field of biomedical materials.

A method for preparing optical film includes mixing PMMA mixture with solvent uniformly to form a wet film, heating said wet film to form an optical dried film, enabling to mix PMMA mixture in any ratio as per required property with solvent to form a mixed solution then carrying out heat treatment on mixed solution to obtain optical film.

The invention relates to a high peeling resistance concrete surface protective coating and a construction method thereof. The invention aims at providing the high peeling resistance concrete surface protective coating and the construction method thereof. The high peeling resistance concrete surface protective coating is characterized by comprising a long active primer layer, an elastic epoxy mortar layer and an elastic coating which are sequentially arranged on the surface of concrete. The coating is applicable to the field of concrete protection.