48results about How to "Improve high temperature deformation resistance" patented technology

The invention relates to an asphalt and SBS compatibility evaluation method based on molecular dynamics simulation, belongs to the technical field of modified asphalt compatibility, and mainly solvesthe problem that no specific and accurate method for evaluating the compatibility of SBS and asphalt exists at present. A molecular dynamics simulation method is used as a basis. The method comprises:using molecular dynamics simulation software, respectively constructing a single asphalt system unit cell model, an SBS block copolymer molecular structure model and an SBS modified asphalt blendingsystem model, respectively carrying out molecular dynamics simulation on the models, calculating to obtain solubility parameters and interaction energy, and characterizing and evaluating the compatibility of SBS and asphalt by taking the solubility parameters and interaction energy as indexes. The compatibility evaluation method disclosed by the invention provides an idea for researching the compatibility mechanism of the SBS and the asphalt. The method provides guidance for the establishment of a modified asphalt compatibility evaluation system and an evaluation system thereof, provides a theoretical basis for the formula of the SBS modifier, and has very important significance for solving the problem of asphalt segregation and improving the stability of the modified asphalt.

The invention relates to a high temperature deformation-resistant modified polypropylene random (PPR) copolymer tube and a preparation method thereof. The high temperature deformation-resistant modified PPR copolymer tube comprises, by weight, 60 to 90 parts of a PPR copolymer special-purpose material, 10 to 40 parts of talcum powder, 0.2 to 0.6 parts of an alpha nucleating agent and 0.3 to 0.6 parts of an anti-oxidant. The alpha nucleating agent and the talcum powder improve high temperature deformation resistance of a PPR tube special-purpose material. The talcum powder reduces a PPR tube cost. The preparation method has simple processes and can be realized easily.

The invention discloses a modified fiber asphalt rubber paste, which belongs to the technical field of a building material. According to the invention, silicon nitride whiskers and hydrofluoric acid are mixed for immersion, a mixture is filtered, washed, and dried to obtain pretreated silicon nitride whiskers, the pretreated silicon nitride whiskers, secondary sedimentation tank sludge, sucrose, and a sodium alginate solution are mixed and fermented, the mixture is filtered, washed, dried, and carbonized to obtain modified silicon carbide whiskers; the rice husk fiber is pulverized and sievedto obtain fine rice husk fiber, the rice husk fiber, a biogas slurry, a glucose solution, and the water are mixed and fermented, and the mixture is filtered to obtain a pretreatment fiber, the pretreated fiber is mixed with a sodium hydroxide solution for immersion, and the mixture is frozen, sieved, melted, and dried to obtain a modified fiber; asphalt, mixed mineral powder, the modified siliconcarbide whisker, phospholipid, rubber powder, organic silicon resin, the modified fiber and the waste oil are heated, and the materials are stirred to obtain the modified fiber asphalt rubber paste.

The invention discloses a multifunctional permeable asphalt mixture and a preparation method thereof. The multifunctional permeable asphalt mixture comprises the following components in parts by mass: 100 parts of mineral aggregate, 4-6 parts of modified asphalt and 0.1-0.5 part of a fiber stabilizer, wherein the mineral aggregate is composed of coarse aggregate, fine aggregate, infiltration materials and mineral powder; the modified asphalt is composed of 100 parts of matrix asphalt, 4-8 parts of SBS, 8-12 parts of waste rubber powder, 0.4-0.9 part of MWCNT (Multi Walled Carbon Nanotubes) and 2-5 parts of a tackifier; and the fiber stabilizer is one of lignin fibers, mineral fibers or polyester fibers. According to the multifunctional permeable asphalt mixture provided by the invention, the mineral aggregate contains the infiltration materials, and the infiltration materials refer to low-cost and readily-available materials such as volcanic, activated carbon, ceramsite, zeolite or crab shell-clam shell powder and the like, so that rainfall runoff pollution can be effectively controlled, the aims of fully utilizing rainwater resources and supplementing groundwater resources are achieved, and the preparation cost can be effectively reduced. The used modified asphalt is compounded by the MWCNT and SBS, so that the shear deformation resistance of the asphalt can be obviously improved.

The invention discloses an urban road pavement structure which comprises a drainage layer, a support layer, a foundation layer, a drainage degradation layer and a drainage cooling system. The supportlayer is directly paved on an urban road foundation and comprises a plurality of laminated metal perforated plates and gravel arranged between the metal perforated plates in a filling manner; the drainage layer is arranged below the support layer and is inserted into the urban road foundation; the foundation layer is arranged above the support layer and sinks along the middle portion of the uppersurface of a road in the length direction in an inclined downward manner, the longitudinal section of the foundation layer is in an isosceles trapezoid shape with the large upper portion and the smalllower portion; the drainage degradation layer is arranged above the foundation layer, and the upper surface of the drainage degradation layer is horizontal; and the drainage cooling system comprisesa heat exchange tube, a heat exchange main chamber, and a vertical tube, a pipe cap and a water storage tank; the middle portion of the upper portion of the water storage tank is provided with an opening, and the opening is opposite to the sinking position of the upper surface of the foundation layer. The pavement structure has good stability, has good water permeability and water storage performance and has high pavement high temperature deformation resistance.

The invention relates to a preparation method of nano carbon powder, SBS and rubber powder composite modified asphalt. The preparation method comprises the following steps: preparing raw materials such as three groups of nano carbon powder, three groups of rubber powder and three groups of SBS, carrying out surface modification on the nano carbon powder by adopting a titanate coupling agent solution in advance so that an optimal blending ratio is obtained, designing 9 groups of test schemes, carrying out a physical performance test to obtain an optimal blending ratio, giving independent variable factors, taking the modified asphalt at the optimal blending ratio as a research object, and taking a shearing rotation speed, reaction time, a reaction temperature, development time and a development temperature as independent variable control factors, obtaining a test scheme, carrying out an orthogonal test on the parameters, designing 16 groups of test schemes, preparing modified asphalt byutilizing a high-shear emulsifier and a stirrer, carrying out a physical performance test and carrying out grey correlation analysis to obtain a comprehensive score. The preparation method can improvehigh-temperature deformation resistance and the low-temperature crack resistance of the asphalt and reduce the temperature sensitivity.

The invention discloses a green low-carbon environment-friendly road structure adopting regenerative material. The structure comprises a subgrade and a pavement which are sequentially arranged from bottom to top; the subgrade comprises an embankment and a road bed which are sequentially arranged from bottom to top, wherein the embankment is prepared from urban building waste regenerative mixture,and the road bed is prepared from urban building waste regenerative grading mixture; and the pavement comprises a cushion layer, a bottom base layer, a base layer, a lower layer, a middle layer and anupper layer which are sequentially arranged from bottom to top, and the cushion layer is prepared from building waste regenerative grading aggregate. According to the structure, the requirements of the existing traffic development can be guaranteed, the environmental problems left due to the urban development are resolved, and the problem of destructive mining on natural resources due to the foundation engineering construction is solved.

The invention discloses a preparation method of a sizing agent of a mold core for investment casting. The preparation method comprises the following steps: (1) putting powder and a mineralizing agent into a ball grinder to carry out mixed grinding for more than 2 hours, taking out and drying so as to cause moisture content to be less than 0.3wt%; and (2) adding 15wt%-wt20% of plasticizer into a stainless steel container with a stirrer, heating to 85-90 DEG C, adding powder and 0.5-1.0wt% of oleic acid under the condition of stirring, and continuously stirring for 4-5 hours to obtain the sizing agent which is used for preparing the core or is cast into ingots for later use. The preparation method has the beneficial effects that a mold core green body made of quartz glass is used; after being heated to above 1100 DEG C, the mold core green body can be sintered; the mineralizing agent can facilitate sintering and has the effects of improving the high-temperature anti-deformation capacity of the mold core, increasing the crystallization rate of quartz glass and the like; and all the performances such as the porosity, bending resistance, volume density and the sintering shrinkage of the mold core are improved by using the use amount of the plasticizer.

The invention discloses martensite high-temperature wear-resistant steel and a production method thereof. The martensite high-temperature wear-resistant steel comprises the following chemical components in percentage by weight: 0.18%-0.24% of C, 0.1%-0.35% of Si, 0.5%-1.1% of Mn, not greater than 0.013% P, not greater than 0.004% of S, 0.03%-0.06% of Als, 0.025%-0.055% of Nb, 0.02%-0.04% of V, 0.01%-0.025% of Ti, 0.1%-0.35% of Cr, 0.25%-0.45% of Mo, 0.0005%-0.0018% of B, 0.003%-0.0045% of N, not greater than 1.7 ppm of H, 0.002%-0.004% of Ca and the balance of Fe and inevitable impurities. Inthe production method, a temperature-controlled and speed-controlled quenching process and a sub-temperature quenching heating process are adopted; and interval cooling is adopted in the quenching cooling process. The martensite high-temperature wear-resistant steel has good mechanical properties under a high-temperature service condition.

The invention belongs to the technical field of engineering materials, and particularly relates to a nano-composite natural rock modified asphalt mixture additive. The additive is prepared from natural rock asphalt as a main raw material and waste tire rubber powder, a polymer, nano-diatomite, lignin fibers, nano-zinc oxide and other raw materials as auxiliary materials, so the elasticity, adhesiveness and rigidity of an asphalt mixture are effectively improved, and the high-temperature deformation resistance, the low-temperature crack resistance and the water damage resistance of the compound rock modified asphalt mixture are remarkably improved.

The invention provides a carbon fiber thermal insulation cured felt. The carbon fiber thermal insulation cured felt comprises an inner felt layer, a middle felt layer and an outer felt layer, whereinthe inner felt layer and the outer felt layer are respectively adhered to the two sides of the middle felt layer; the densities of the inner felt layer, the middle felt layer and the outer felt layerare reduced in sequence; the thicknesses of the inner felt layer, the middle felt layer and the outer felt layer are increased in sequence; the inner felt layer is filled with a carbon/carbon composite material; the middle felt layer is filled with a hard fiber hard felt. The carbon fiber thermal insulation cured felt has the advantages that the inner felt layer, the middle felt layer and the outer felt layer are compounded through resin and a carbon binder, the high temperature deformation resistance capacity of the inner felt layer can be enhanced through the adding of the carbon binder andthe improvement of the density of the inner layer thermal insulation felt, the structure is low in cost, an inner felt layer adopting a separated structure is fixed through a countersunk nut and a hard felt, in order to solve the problem of fixing of a thin carbon plate, the carbon plate is pressed into a local strengthened irregular structure, after a carbon/carbon protective plate loses effectiveness, a protective plate in the innermost layer is only required to be replaced, the structure is beneficial to the reduction of failure rate, and the service life is prolonged.

The invention relates to the technical field of the preparation of road engineering materials, in particular to a preparation method of a high-temperature-rutting-resistant warm mix asphalt mixture. The preparation method comprises the following steps: dispersing SBS rubber powder in the mixed asphalt to obtain the asphalt with the dispersed SBS rubber powder, adding the asphalt with the dispersedSBS rubber powder into white mineral oil, performing high-speed cutting emulsification to obtain rubber powder modified asphalt, mixing filled aggregate rubber powder modified asphalt, a warm mix agent and quick lime to obtain the high-temperature-rutting-resistant warm mix asphalt mixture. The warm mix asphalt mixture is dispersed in the white mineral oil in a small particle form, the solubilitybetween the white mineral oil molecules and the SBS molecules is improved, the low-temperature fracturing resistance of the warm mix asphalt mixture and the adhesive force between binder and aggregates at the low temperature can be improved, and the molten fiber components and little un-molten components coat the surface of stone to form a bridging effect between the stone and the asphalt and between the stone and stone, so that a large adhesive force is produced, the viscosity elasticity of the white mineral oil is improved, and the application prospect is wide.

The invention relates to a graphene reinforced alumina-based ceramic bearing for a robot, which is prepared by the following steps: mixing alumina ceramic powder and graphene powder by using a three-dimensional mixer to obtain uniformly mixed alumina-based ceramic core powder; mixing the ceramic powder and a plasticizer to prepare required ceramic slurry, pressing a wet ceramic core sample by using a hot-press injection molding method, and sintering the obtained wet ceramic core under the protection of an inert atmosphere to obtain the graphene-reinforced alumina-based ceramic core. Accordingto the invention, the graphene material with excellent mechanical properties and thermal properties is innovatively introduced into the alumina-based ceramic core material system, the preparation process of the graphene-reinforced alumina-based ceramic core material is simple and feasible, the operability is strong, and the prepared ceramic core has excellent high-temperature properties and is easy to dissolve. The ceramic core can meet the preparation and use requirements of the single crystal hollow blade, and the size precision and the percent of pass of the blade can be guaranteed.

The invention provides a temperature measurement device for a radiant tube of a rotary kiln, and belongs to the technical field of temperature measurement. The device comprises a rotary kiln housing,the radiant tube, a temperature measurement conduit and a thermocouple, wherein the radiant tube is located in the rotary kiln housing, and is parallel to the central axis of the rotary kiln housing.The temperature measurement conduit passes through the rotary kiln housing, and the thermocouple is disposed in the temperature measurement conduit, and passes through the temperature measurement conduit along the axis. The temperature measurement conduit and the thermocouple are perpendicular to the radiant tube. The central axis of the temperature measurement conduit is tangent to the outer wallof the radiant tube. A temperature measurement probe of the thermocouple is guided by the temperature measurement conduit to make contact with the radiant tube. The device is simple and practical, and can accurately measure the temperature of the radiant tube in the rotary kiln.

A high-modulus asphalt material with excellent durability and a preparation method thereof. The high-modulus asphalt material is mainly prepared from the following components in parts by mass: 50-65 parts of low-grade asphalt, 15-25 parts of a high-modulus additive, 5-10 parts of coarse aggregate, 5-10 parts of fine aggregate, 3-5 parts of mineral powder, 1-3 parts of an antioxidant, 1-3 parts ofan anti-ultraviolet agent and 0.3-0.5 part of a cross-linking agent. The high-modulus additive is mainly prepared from the following components in parts by mass: a styrene-butadiene-styrene block copolymer, high-density polyethylene, polyethylene PE, low-density polyethylene, organic silicon modified hydroxyl-terminated hyperbranched polyester resin, polypropylene and linear low-density polyethylene. According to the high-modulus asphalt material with excellent durability and the preparation method of the high-modulus asphalt material, the formula is reasonable, the preparation process is simple, the durability is excellent, the modulus of the asphalt material is improved, the high-temperature deformation resistance of an asphalt pavement is improved, the anti-fatigue performance of the asphalt material is improved, and the application prospect is expanded.

The invention relates to a manufacturing method of a high-quality quartz crucible, a vacuum arc method is adopted for melting, and the displacement of a graphite electrode and the retention time on each position meet the following conditions: the end face position of an upper opening of a mold is taken as a zero point, the end of the graphite electrode above the zero point is +, and the end of the graphite electrode below the zero point is-; the initial position of the graphite electrode is + 0.10-0.30 times of the outer diameter of the crucible, the retention time is greater than or equal to 2 minutes, then the graphite electrode is sequentially descended according to a step displacement method, the graphite electrode is retained for a period of time every time when the graphite electrode is descended, and the graphite electrode reaches the bottom polishing position after displacement is carried out for at least 3 times; the bottom polishing position is the lowest position where the graphite electrode reaches, enters the crucible blank and is 300-550mm away from the bottom of the crucible; at the position, the graphite electrode stays and performs high-temperature polishing and volatilization impurity removal on the bottom of the crucible; the outer diameter of the crucible is + 0.05-0.07 times of the outer diameter of the crucible, and high-temperature volatilization impurity removal is carried out on the upper portion of the inner wall of the quartz crucible at the tail sweeping station. The method is used for improving the purity of the transparent layer of the crucible, enhancing the high-temperature deformation resistance and the like.