35results about How to "Play a strengthening effect" patented technology

The invention discloses a preparation method of a graphene alloy nanocomposite and an SLM (Selective Laser Melting) forming process. According to the preparation method, turbid liquid is prepared through the ultrasonic vibration of anhydrous ethanol, so that the graphene is uniformly dispersed in the anhydrous ethanol, the graphene is uniformly dispersed, then after the graphene anhydrous ethanolturbid liquid is mixed with high-temperature alloy in proportion, the graphene and partial residue are distributed in the grain boundary and crystals by participating in the interfacial reaction, so that the strength and toughness of a formed part are improved, and the hot cracking tendency is reduced; the addition of graphene changes the organization form of the material; and in the SLM forming process, the graphene in the graphene high temperature alloy nanocomposite is used as a heterogeneous nucleating agent, and increases the nucleation rate in the solidification crystallization process.The graphene high temperature alloy nanocomposite is prepared by the dielectric barrier discharge plasma-assisted ball milling technique. The plasma enhances the activity of powder, so that columnar crystals preferentially growing change to isometric crystals, grains are refined and the performances are improved.

The invention relates to a combined high-precision hot stamping plate and a three-channel hot stamping refraction anti-counterfeiting mark, which aims to solve the technical problem of poor anti-counterfeiting effect of the traditional nesting overprinting, including a set of combined high-precision The laser engraving plate and two hot stamping films with different effects and colors, through the combination of the combined hot stamping plate and the hot stamping plate, combined with the structural design characteristics of the hot stamping mold and the hot stamping mold, realize the hot stamping plate and the hot stamping plate The three-channel refraction anti-counterfeiting logo is successively folded and ironed, so that different patterns, characters or lines can be observed from different viewing angles, which solves the technical problem that the folded ironing cannot form refraction anti-counterfeiting at various angles of view in the prior art.

The invention discloses a casting heat-proof magnesium alloy material in the light metal material domain, which comprises the following parts: 5%-10% gadolinium, 0. 5%-1. 0% manganese, 0. 3%-0. 8% scandium and residual magnesium, wherein Gd is main alloy element, which can form stable Mg-Gd compound under high temperature; Mn and Sc can form Mn2Sc in the heat disposing course; the property of alloy possesses dynamic property under normal temperature, which reduces the strength of the alloy slowly under 200-300 deg. c to satisfy aviation and automobile industry.

The invention relates to a 540MPa grade hot-rolled pickled steel plate and a manufacturing method thereof. The hot-rolled pickled steel plate comprises the following chemical components in percentageby mass: 0.15-0.25% of C, 0.01-0.06% of Si, 0.80-1.30% of Mn, 0.01-0.06% of Al, 0.015-0.050% of Nb, and/ or 0.30-0.40% of Cr, less than 0.010% of P, less than 0.005% of S, and the balance Fe and inevitable impurities; and the final structure of the hot-rolled pickled steel plate comprises 55-65% by volume of ferrite, 30-40% by volume of pearlite, and 5-15% by volume of bainite. According to the 540MPa grade hot-rolled pickled steel plate, the components are optimized on the basis of the chemical components of a C-Mn series steel; the technical parameters of the rolling process, the cooling process and the pickling process are controlled, and thus the hot-rolled pickled steel plate of which the yield intensity is 440MPa or more, the tensile strength is at540MPa grade or more, and the longitudinal elongation A is not less than 26% can be obtained.

The invention discloses a nickel toughening high-chromium cast iron self-protection overlaying flux-cored wire. The flux-cored wire uses a low-carbon steel strip as a cover, and comprises the following flux-cored components in percentage by mass: 55-65% of high carbon ferrochrome, 16-24% of nickel powder, 0.5-1% of 60-mesh graphite, 1-2% of 200-mesh graphite, 1-5% of 60-mesh ferroboron, 1-3% of 200-mesh ferroboron, 1-2% of 60-mesh aluminum magnesium alloy, 1-2% of 200-mesh aluminum magnesium alloy, 1-2% of 60-mesh manganese powder, 1-3% of 200-mesh manganese powder, and the balance iron powder; and the flux-cored powder is 50-56% of the total weight of the flux-cored wire. The flux-cored components with different particle sizes are added to the flux-cored wire to guarantee excellent welding process performance, and a proper amount of Ni is added in the flux-cored components to urge increment of austenite number in an overlaying alloy high-chromium cast iron hypereutectic structure matrix; and meanwhile, the solid solution strengthening effect of the matrix is obvious, an overlaying alloy is effectively toughened, the crack resistance is greatly improved, the welding process performance is excellent, the cladding efficiency is high, and the multilayer welding needs no slag removal.

The invention discloses a quick-drying type SBR-modified emulsified asphalt sealing layer mixture and a preparation method thereof. The mixture comprises the following components in parts by mass: 100parts of mineral aggregate, 11-13 parts of SBR-modified emulsified asphalt, 3-5 parts of cement, 3-5 parts of carbon fiber powder and 12-14 parts of tap water. The mixture has the advantages of beinghigh in strength, good in crack control effect and capable of being rapidly formed under a humid climate condition. The problems existing in the prior art are solved.

The invention discloses a preparation method and application of a modified SiCf/SiC ceramic-based composite material with SiC nanowires grown in situ. The preparation method comprises the following steps: placing a graphite flake containing a metal coating and a carbon fiber preform into a chemical vapor deposition furnace under a non-contact condition; carrying out chemical vapor deposition to realize in-situ growth of the SiC nanowires on pores and the surface of a carbon fiber preform so as obtain a SiC fiber preform with the SiC nanowires; and carrying out chemical vapor deposition again to obtain a SiC matrix, thereby obtaining the SiC nanowire modified SiCf/SiC ceramic-based composite material. According to the invention, a metal catalyst is indirectly introduced, the metal catalyst is diffused to the surface and internal pores of the SiC fiber preform in a gas phase manner, catalyst distribution is more uniform, and the density of the SiC nanowires grown under catalysis is moderate; and the maximum crushing load of the obtained SiC nanowire-containing SiCf/SiC composite material can reach 1175.0 N, so compared with a SiC nanowire-modified SiCf/SiC ceramic-based composite material in the prior art, the crushing performance of the tubular SiCf/SiC composite material obtained by the preparation method disclosed by the invention is greatly improved.

Provided are molded articles made of a fiber-reinforced material which are lightweight and have superior surface smoothness and mechanical strength, heat-curable resin compositions that are favorably used in the manufacture of said molded articles, and fiber-reinforced molding materials that are used in manufacturing said molded articles and have a superior low-pressure moldability. As a heat-curable resin composition to be used in the fiber-reinforced molding material, that which comprises a heat-curable resin, a hollow filler with packed bulk density of 0.24-0.45 g/cm3, and kaolin clay with packed bulk density of 0.60-1.20 g/cm3 as essential components was used.

The invention relates to a graphene surface modification method based on a dry method. The method comprises the following steps: S1, adding graphene oxide into a concentrated nitric acid solution, performing ultrasonic dispersion and filtration, repeatedly washing a filter cake with deionized water to be neutral to obtain the roughened graphene oxide; S2, putting the roughened graphene oxide in the S1 into a ball mill to be ball-milled, and then pouring silver acetate into the ball mill to be mixed with graphene oxide and ball-milling the mixture again to obtain a graphene oxide/silver acetate mixture; S3, putting the graphene oxide/silver acetate mixture into a muffle furnace to be heated and introducing a nitrogen atmosphere to obtain Ag particle-loading graphene oxide; and S4, adding the Ag particle-loading graphene oxide after ultrasonic treatment into hydrazine hydrate to be reduced to prepare Ag particles, the grain sizes of which are 30-100nm, and uniformly dispersing the Ag particles to the surface of graphene. The method provided by the invention is simple to operate, can produce on a large scale, and is free of heavy metal pollution.

The invention provides a road heating mat for melting ice and snow and a pavement construction method thereof. The heating mat is arranged on an interface surface of an upper surface layer and a middle surface layer, is preformed by a heat insulation grid and heating cables, and can be divided into a straight mat and a bend mat according to the set shape of the heat insulation grid; the interlayer overall size occupancy rate and the field pavement power of the heating mat are utilized for synchronously adjusting the set parameters of the heat insulation grid, so that the interlayer stability can be effectively improved; the heating cables are arranged along grid bars of the heat insulation grid, so that the heat utilization ratio of the heating cables can be maximized. According to the construction method provided by the invention, through paving a rail, the heating mat can be effectively prevented from being crushed, pulled to be rolled up or pushed to slide so as to be damaged; through spraying emulsified asphalt for two times, fixing the heating mat through staple bolts, and setting the grinding times according to the interlayer overall size occupancy rate of the heating mat, the interlayer stability of the road requiring melting ice and snow can be effectively improved, the road damage is reduced, and the service life of the road requiring melting ice and snow is prolonged.

The invention discloses a frame assembly and an engineering vehicle, and relates to the technical field of engineering machinery. The frame assembly comprises two longitudinal beams arranged in a spaced mode, a first beam set, a second beam set, a gantry beam, a lifting beam set and a rack assembly. The first beam set is arranged at one ends of the longitudinal beams, and the two ends of the first beam set are connected with the two longitudinal beams respectively. The second beam set is arranged at the other ends of the longitudinal beams, and the two ends of the second beam set are connected with the two longitudinal beams respectively. The gantry beam is arranged between the first beam set and the second beam set, the two ends of the gantry beam are connected with the two longitudinal beams respectively, and a steering support is arranged on the gantry beam. The lifting beam set is arranged between the gantry beam and the second beam set, and the two ends of the lifting beam set are connected with the two longitudinal beams respectively. The two ends of the rack assembly are detachably connected with the two longitudinal beams, and a part of the rack assembly is arranged corresponding to the gantry beam. The frame assembly can reduce the stress concentration phenomenon, reduce the production cost and improve the strength, the rigidity and the reliability.

The invention relates to a ceiling splicing structure and a splicing method thereof. A first splicing block flush with the upper surface of a first splicing plate is arranged on the side face of the first splicing plate, a second splicing block is arranged in the middle of the side face of a second splicing plate, and the first splicing plate and the second splicing plate are connected through vertical splicing wood pins. The distance between the upper side of the second splicing block and the upper surface of the second splicing plate is consistent with the thickness of the first splicing block, a bonding glue layer is arranged on the contact positions of the first splicing plate and the first splicing block with the second splicing block, and a steel wire net is arranged on the lower surface of the second splicing block. The side face of the steel wire net penetrates into the first splicing plate and the second splicing plate through wire net fixing bolts, and the lower portion of the steel wire net is integrally connected with a concrete layer flush with the lower surfaces of the first splicing plate and the second splicing plate. Through improvement on the structure and splicing mode of the two splicing plates, it can be ensured that the supporting face of the upper portion of the concrete layer is a seamless plane, it is ensured that the structure of the concrete layer isstable for a long time, and the function of wall paint cracking prevention of the ceiling splicing structure is achieved.

The invention discloses 600MPa-grade automobile axle housing steel for hot stamping and a production method thereof. The 600MPa-grade automobile axle housing steel comprises the following chemical components in percentage by weight: 0.240%-0.335% of C, 0.08%-0.65% of Si, 1.75%-2.25% of Mn, 0.010%-0.065% of Al, 0.046%-0.085% of Nb, 0.052%-0.102% of Ti, 0.054%-0.102% of V, 0.10%-0.46% of Cr, 0.12%-0.26% of Mo, 0.0014%-0.0035% of B, 0.033%-0.042% of La + Ce, 0.0014%-0.0050% of Ca, less than or equal to 0.010% of P, less than or equal to 0.005% of S and less than or equal to 0.003% of N. The yield strength of the steel plate is not less than 600 MPa, the tensile strength is not less than 780 MPa, and the transverse elongation A50 is not less than 28%.