11results about How to "Improved creep properties" patented technology

The invention discloses an HDPE (high-density polyethylene) double-wall corrugated pipe reinforced master batch, which belongs to the technical field of high polymer materials and comprises the following materials in parts by weight: 50-70 parts of UHMWPE (ultrahigh molecular weight polyethylene), 30-40 parts of modified inorganic fiber and 5-10 parts of polyethylene wax. The molecular weight of the UHMWPE is 0.5 to 1.5 million; in the preparation process of the enhanced master batch, the length-diameter ratio of a twin-screw extruder is greater than or equal to 48: 1, and the temperature of an extruded melt is 220-240 DEG C. By adopting an ultra-high molecular weight polyethylene molecular chain entanglement regulation and control technology, an ultra-long molecular chain of UHMWPE is unwound under melt extrusion, the molecular chain is wound on the surface of the modified columnar inorganic fiber, the degree of freedom of the ultra-long molecular chain is constrained and limited, the creep retraction capability of the composite material is reduced, the ring stiffness is greatly improved, and the performance of the composite material is improved. And the impact performance is improved.

The invention provides a test device and method for evaluating chlorine resistance of a material. The test device comprises a water treatment unit; a chlorine dioxide generating unit; the storage tank is used for mixing the purified water and the chlorine dioxide therein to form a test solution; the test system comprises a water tank and a test unit, the test unit comprises at least one sample rack and a test device, the sample rack is used for fixing a test sample, and the test device is used for monitoring the performance of the test sample; the circulating system comprises a circulating pipeline and a circulating pump, the circulating pipeline is used for communicating the storage tank with the water tank to form a circulating path, and the circulating pump is used for enabling the test solution to circularly flow in the circulating path; and the wastewater treatment unit is communicated with the circulating pipeline and is used for reducing the test solution separated from the circulating pipeline and discharging the test solution out of the device. The test device is provided with the circulating system, so that various parameters of the test solution can be kept stable, and meanwhile, the operability, the safety and the environmental protection are obviously improved.

The invention relates to a high-entropy alloy with excellent creep property and a preparation method thereof. The alloy is expressed as FeaCobCrcNidTapAlqMn by atomic mole percentage, and 10 < = a < = 20, 20 < = b < = 25, 10 < = c < = 20, 25 < = d < = 35, 5 < = p < = 10, 0 < = q < = 8, and 0 < = n < = 5. The preparation method comprises the steps that all the raw materials are taken according to the designed components, then smelting is conducted under the protective atmosphere, and after solid solution water quenching treatment, hot rolling treatment and secondary solid solution treatment are conducted, heat preservation is conducted at the temperature of 750-950 DEG C, and then quenching is conducted. The product is obtained by reasonably regulating and controlling components and performing thermal deformation and thermal treatment processes. Under the high-temperature creep condition of 750 DEG C / 350 MPa, the service life of the obtained product reaches up to 1245 h and is far longer than that of similar products, the room-temperature tensile strength is larger than 1.5 GPa, the bottleneck that a Laves type eutectic high-entropy alloy does not have room-temperature tensile plasticity is broken through, and wide engineering application prospects are achieved.

The invention discloses a base layer treating agent, a preparation method thereof and a composite waterproof system containing the base layer treating agent. The base layer treating agent comprises carboxyl graft modified epoxy resin, an amine curing agent, a reactive diluent and an accelerant; wherein the epoxy value of the carboxyl grafted and modified epoxy resin is 0.30-0.38 eq / 100g, and is measured by a hydrochloric acid-acetone method; the content of the amine curing agent is determined according to the epoxy value of the carboxyl grafted and modified epoxy resin, the number of active hydrogen atoms on amido in amine curing agent molecules and the molecular weight of the amine curing agent; the molar ratio of the amine curing agent to the reactive diluent to the accelerant is 1: (4-5): (0.2-0.4). The base layer treating agent disclosed by the invention can be used for increasing the sealing property of a base surface and enhancing the adhesive force between a waterproof coating and a waterproof roll and the base surface, so that the waterproof effect of a composite waterproof system is stronger.

The invention discloses a cracking-resistant high-performance halogen-free flame-retardant PC alloy material and a preparation method thereof. The material is prepared from 50 to 85 parts of PC resin, 8 to 15 parts of halogen-free flame retardant, 5 to 15 parts of flexibilizer, 1 to 5 parts of cracking modifier, 3 to 10 parts of chemical resistance modifier, 0.3 to 0.5 part of talcum powder, 0.2 to 0.5 part of lubricant and 0.2 to 0.5 part of antioxidant. The material is endowed with excellent low-temperature toughness and creep resistance, and the problems that parts formed by injection molding of the flame-retardant PC alloy crack after being assembled and parts crack after being placed for a long time and the weather turns cold are effectively solved. Wherein the talcum powder effectively neutralizes acidic substances generated due to decomposition of a flame retardant in the screw extrusion process, and degradation of a PC base material is reduced; the slow crystallization rate of the chemical-resistant modifier PET can inhibit the movement of a PC molecular chain, so that the PC stress is slowly released, and the equilibrium state is better achieved; the cracking modifier endows the material with higher ductility and toughness, promotes the compatibility of the material, and can endow the surface of a workpiece with comfortable touch feeling.

The utility model discloses a novel railway elastic base plate which comprises a sleeper, a groove is formed in the upper surface of the sleeper, an elastic base plate body is arranged above the groove, the elastic base plate body is made of thermoplastic elastomer materials, a shock pad is fixedly installed in the elastic base plate body, and the elastic base plate body is made of thermoplastic elastomer materials. A plurality of hexagonal buffer holes which are arranged at equal intervals are formed in the shock pad, and vibration isolation layers are fixedly mounted on the upper surface and the bottom surface of the shock pad. According to the device, the elastic base plate body and the thermoplastic elastomer material have excellent flexibility, excellent flex cracking resistance, high elasticity, stress relaxation resistance and creep resistance at room temperature and low temperature and are more applied to the elastic cushion layer, and the damping pad and the vibration isolation layer both have good bearing capacity and fatigue resistance, so that the service life of the device is prolonged, and the service life of the device is prolonged. High-speed impact vibration generated when a vehicle passes through a rail is buffered, a roadbed and sleepers are protected, and a railway signal system is electrically insulated.

The invention discloses a precipitation-hardening nickel-based alloy creep mechanical property prediction method based on a microstructure, and relates to the technical field of performance prediction, and the method comprises the following steps: S1, obtaining characteristic parameters of a nickel-based alloy; s2, constructing a creep property prediction model; s3, optimizing the creep property prediction model by utilizing the characteristic parameters of the nickel-based alloy; and S4, completing performance prediction by using the optimized creep performance prediction model. According to the method, on the basis of the model of the initial microstructure, the creep property of an unknown material can be predicted by manually inputting different microcosmic parameters, so that the microstructure characteristics which should be possessed by the material with relatively good creep property can be obtained.

The invention relates to the technical field of building waterproof materials, and particularly discloses a non-cured rubber asphalt waterproof coiled material and a preparation method thereof.The non-cured rubber asphalt waterproof coiled material comprises a tire base layer, non-cured rubber asphalt layers coating the two faces of the tire base layer, and isolating membrane layers compounded on the surfaces of the non-cured rubber asphalt layers; the non-cured rubber asphalt layer is prepared from the following raw materials: matrix asphalt, a rubber modifier, liquid tackifying resin, a functional aid, sodium bentonite and a plasticizer; the preparation method comprises the following steps: coating two surfaces of a tire base layer with a non-cured rubber asphalt material to obtain a non-cured rubber asphalt layer, and then coating the surface of the non-cured rubber asphalt layer with an isolating membrane layer to obtain the required non-cured rubber asphalt waterproof coiled material, the preparation method disclosed by the invention is simple, and the obtained non-cured rubber asphalt waterproof coiled material has excellent adhesive property, creep property, self-healing property, construction property and durability, and meets the high-performance requirements of modern buildings on waterproof materials.

This invention relates to the field of composite coating technology, specifically to a composite coating for an aluminum-silicon wire submerged roll, its preparation method, and its application. The method involves sequentially depositing CoCrW, CoCrW-Ca2SiO4, Ca2SiO4, and Si-SiC, or sequentially depositing Ca2SiO4 and Si-SiC, on the surface of the submerged roll using atmospheric plasma spraying (APS). Subsequent machining then yields a four-layer CoCrW / CoCrW-Ca2SiO4 / Ca2SiO4 / Si-SiC composite coating or a two-layer Ca2SiO4 / Si-SiC composite coating (hereinafter referred to as the composite coating) with a specified surface roughness. The composite coating prepared by the method described in this invention can withstand temperatures up to 900℃ and possesses excellent wear resistance and aluminum-silicon corrosion resistance, significantly improving the lifespan of the submerged roll.

The invention discloses metamaterial concrete, a preparation method thereof and a rigid-flexible composite pavement structure, and belongs to the technical field of road construction. The metamaterial concrete disclosed by the invention is provided with a Cartesian oval line hole, the Cartesian oval line hole is filled with a phase change material, under a two-dimensional Cartesian coordinate system, the expression of the Cartesian oval line is as follows: (x2 + y2) 2 + 2a2 (y2-x2) + a4-b4 =, in the formula, a is 3.76-7.51 mm; and b ranges from 4.19 mm to 8.39 mm. The metamaterial concrete disclosed by the invention has the performance of autonomously regulating and controlling the temperature and also has the characteristic of negative Poisson's ratio, and when the metamaterial concrete is applied to a rigid-flexible composite pavement structure, the compression resistance and the impact resistance of the pavement structure can be enhanced, the overall strength, the toughness and the crack resistance of the pavement can be improved, and finally, the design of a cool pavement is realized.

The present invention discloses a method for preparing and applying a high-performance boron-free prefabricated plate. The method involves a boron-free Ni‑Co‑Ta‑W‑Cr‑Ti‑Al‑Nb‑Mo‑Zr high-temperature alloy boron-free activator, with a liquidus of 1140°C to 1170°C. The present invention also introduces a method for using a boron-free activator, including two methods of direct sintering and prefabricated plate preparation. The boron-free activator is fully mixed with the master alloy powder in the form of a liquid phase and then directly sintered or prepared into a prefabricated plate. The prefabricated plate is placed or bonded to the material to be repaired, and can be melted and welded again below the solid solution temperature of the substrate. There is basically no shrinkage deformation during solidification, the repair area has a uniform structure, and there are no defects such as segregation and holes. The bonding strength reaches more than 90% of the substrate, and the repair effect is excellent.