Abstract: A friction-reducing and wear-resistant polyamide-imide composite material, a preparation method thereof and an application method therefor are provided, which relate to the technical field of polymer materials. The composite material includes the following raw materials in part by weight: 100 parts of basic slurry, 0.1-20 parts of functional filler, 0-50 parts of diluent, 0.1-1 part of defoamer, and 0.1-1 part of dispersant. The basic slurry is aqueous polyamide-imide emulsion. The functional filler is a biomass carbon composite molybdenum disulfide material treated with a siloxane coupling agent, and a source of biomass carbon is cattail-derived carbon fibers. The composite material has advantages of low friction coefficient and wear rate, wide raw material sources, environmental friendliness, and high dispersion stability. The preparation method has a simple and convenient process and can meet demands for planned production.

Abstract: An intumescent fire-retardant and anti-corrosive coating modified by polyaniline-silicon carbide and a preparation method thereof are provided, the coating includes a compound A and a compound B. The compound A includes a waterborne epoxy resin emulsion, polyaniline-silicon carbide composite material, fire-retardant filler, titanium dioxide, aluminum hydroxide, talc powder, a wetting dispersant, a defoaming agent, a flow agent and water, the compound B includes an epoxy hardener. The polyaniline-silicon carbide composite material is prepared from silicon carbide, phenylamine, protonic acid and an oxidizing agent through an ice bath. The polyaniline-silicon carbide composite material can enhance dispersion in the emulsion through the organic-inorganic composite, and silicon carbide has high thermal stability and good density, while polyaniline serves as a material with unique fire-retardant properties.

Abstract: A molybdenum disulfide nanotube-carbon nanotube-polyether ether ketone composite material and a preparation method therefor are provided, relating to the technical field of composite materials. The molybdenum disulfide nanotube-carbon nanotube-polyether ether ketone composite material is made from the following raw materials in parts by weight: 97-99 parts of polyether ether ketone and 1-3 parts of molybdenum disulfide nanotube-carbon nanotube hybrid material. By adding the molybdenum disulfide nanotube-carbon nanotube hybrid material into the polyether ether ketone, compressive properties and hardness of the molybdenum disulfide nanotube-carbon nanotube-polyether ether ketone composite material are improved, and friction reduction and wear resistance effects are also improved.

Abstract: A grinding simulation test device and method for a steel turnout rail of rail transit are provided. The device includes a rotary unit, a reciprocating unit, a turnout swinging unit, and a pressurizing unit. The rotary unit includes a grinding tool rotary mechanism, a temperature monitoring mechanism and a turnout grinding tool. A movable end of the grinding tool rotary mechanism is detachably connected to the turnout grinding tool through a torque sensor, to thereby drive the turnout grinding tool to rotate and monitor a torque. The temperature monitoring mechanism is configured to monitor temperatures during a grinding process. Through the reciprocating unit, the rotary unit, the turnout swinging unit and the pressurizing unit, four main influencing parameters, namely, moving speed, rotary speed, grinding angle and grinding pressure of a grinding tool, are disassembled into four independent parameters, thereby improving controllability and operability of each single parameter under laboratory conditions.

Abstract: A preparation method of an epoxy rust-tolerant coating modified by nanosheets loaded with rust-converting and rust-inhibiting active units is provided. Strontium chloride, phytic acid and boron nitride are mixed in aqueous solution, transferred to a hydrothermal reactor to prepare strontium phytate-modified boron nitride nanosheets. A defoamer, a dispersant, a leveling agent and an anti-rust filler are added to epoxy resin. Then composite nanosheets are added, supplemented by a diluent, filtered and encapsulated to obtain a component A. A composite amine epoxy curing agent and a flash rust inhibitor are mixed and stirred to obtain a component B. The coating is obtained by mixing the stirred component A and the component B.

Abstract: A trajectory generation method and device for additive manufacturing are provided. The trajectory generation method includes: slicing a to-be-printed model to obtain layers of the to-be-printed model, and determining filling lines for a cross-section of each of the layers; determining coordinates and directions of multiple path points on each of the filling lines based on angle division results between a normal vector of a start point of the filling line and a Z-axis direction of a robot coordinate system and between a normal vector of an end point of the filling line and the Z-axis direction of the robot coordinate system; and determining a printing trajectory of a robot based on the coordinates and directions of the multiple path points. The trajectory generation method makes motion trajectories of industrial robots smoother and printing speeds of the industrial robots uniform and consistent.

Abstract: A characterization protection method for a transfer film of a ring-block friction pair is provided, and relates to the technical field of friction testing. By utilizing a frame-shaped protective tape, the method effectively protects the transfer film on the surface of the friction pair, prevents contamination of the surface by the cutting fluid during the cutting process, and ensures the structural integrity of the transfer film and the analysis of composition and bonding structure of the transfer film. Depending on the test environmental conditions, the thickness and material of the functional layer are adjusted and optimized, thereby effectively maintaining the original state of the region to be analyzed on the ring specimen after the friction test under various test environmental conditions. This ensures more accurate results of subsequent characterization analyses and facilitates a more in-depth analysis of the ring-block friction and wear mechanisms under different working conditions.

Abstract: A superamphiphobic coating with durable wear resistance and corrosion resistance for an aluminum alloy surface and a preparation method therefor are provided. A superamphiphobic paint includes, in parts by weight: 10-15 parts of modified SiO2 particles, 10-15 parts of modified TiO2 particles, 5-10 parts of PTFE, and epoxy resin matrix. The preparation method for the superamphiphobic coating includes: pre-mixing raw materials, uniformly depositing components in a pre-mixed solution on the aluminum alloy surface by electrophoresis, followed by baking to obtain the superamphiphobic coating. A superamphiphobic paint is pollution-free during production and use, and the superamphiphobic coating has high cross-linking density, low curing shrinkage rate, high wear resistance, high hardness, superhydrophobicity, and oleophobiccity.

Abstract: A method for determining fracture toughness includes: obtaining an elastic modulus, a Poisson's ratio, and a stress-strain curve of a cemented carbide specimen; calculating, based on a fracture calculation formula, a maximum cohesive force; constructing a Mooney-Rivlin model and a cohesive force model in a finite element simulation software to describe characteristics of the cemented carbide specimen; constructing models of the cemented carbide specimen under different fracture modes in the finite element simulation software, and performing J-integral analysis to obtain mode I and mode II fracture energies; and performing a nanoindentation uniaxial compression finite element numerical simulation to obtain simulated values of stress-strain results, performing a nanoindentation experiment on the cemented carbide specimen to obtain experimental values of the stress-strain results, and adjusting parameters in finite element simulation analysis based on differences between the simulated values and the experimental

Abstract: A grinding simulation test device and method for a steel turnout rail of rail transit are provided. The device includes a rotary unit, a reciprocating unit, a turnout swinging unit, and a pressurizing unit. The rotary unit includes a grinding tool rotary mechanism, a temperature monitoring mechanism and a turnout grinding tool. A movable end of the grinding tool rotary mechanism is detachably connected to the turnout grinding tool through a torque sensor, to thereby drive the turnout grinding tool to rotate and monitor a torque. The temperature monitoring mechanism is configured to monitor temperatures during a grinding process. Through the reciprocating unit, the rotary unit, the turnout swinging unit and the pressurizing unit, four main influencing parameters, namely, moving speed, rotary speed, grinding angle and grinding pressure of a grinding tool, are disassembled into four independent parameters, thereby improving controllability and operability of each single parameter under laboratory conditions.

Abstract: Near-zero downtime maintenance of containerized applications can be achieved via a modified rolling update strategy for a container orchestration platform. During deployment of a first set of containers based on a first deployment that specifies an image of a first software version and a grace period for preserving existing connections to the first set of containers, a second deployment object is received that specifies an image of a second software version and a minimum execution time for a second set of containers after which new connections to the second set of containers are allowed. After deployment of the second set of containers, new connections to the second set of containers are not enabled until the respective containers have executed for the minimum execution time. Existing connections to each container of the first set of containers are preserved until the earlier of their completion or expiration of the grace period.

Abstract: A grinding simulation test device and method for a steel turnout rail of rail transit are provided. The device includes a rotary unit, a reciprocating unit, a turnout swinging unit, and a pressurizing unit. The rotary unit includes a grinding tool rotary mechanism, a temperature monitoring mechanism and a turnout grinding tool. A movable end of the grinding tool rotary mechanism is detachably connected to the turnout grinding tool through a torque sensor, to thereby drive the turnout grinding tool to rotate and monitor a torque. The temperature monitoring mechanism is configured to monitor temperatures during a grinding process. Through the reciprocating unit, the rotary unit, the turnout swinging unit and the pressurizing unit, four main influencing parameters, namely, moving speed, rotary speed, grinding angle and grinding pressure of a grinding tool, are disassembled into four independent parameters, thereby improving controllability and operability of each single parameter under laboratory conditions.

Abstract: This invention provides a preparation method of solid self-lubricating material with high temperature resistance, including steps described as follows: first, mixing polymer matrix resin and nano lubricating filler to compose a uniform raw material powders; then, placing the raw material powders in the cavity of hot-press die; keeping the temperature for 90-120 min at the first prepressing temperature, controlling the hot-pressing pressure under the third pre-loading pressure, and gradually increasing the temperature to the solid-phase molding temperature of the material; gradually reducing the temperature to the first preloading temperature after the solid-phase molding is completed; next, removing the pressure, finally, obtaining the solid self-lubricating material by naturally cooling to normal temperature and demoulding.

Abstract: An intumescent fire-retardant and anti-corrosive coating modified by polyaniline-silicon carbide and a preparation method thereof are provided, the coating includes a compound A and a compound B. The compound A includes a waterborne epoxy resin emulsion, polyaniline-silicon carbide composite material, fire-retardant filler, titanium dioxide, aluminum hydroxide, talc powder, a wetting dispersant, a defoaming agent, a flow agent and water, the compound B includes an epoxy hardener. The polyaniline-silicon carbide composite material is prepared from silicon carbide, phenylamine, protonic acid and an oxidizing agent through an ice bath. The polyaniline-silicon carbide composite material can enhance dispersion in the emulsion through the organic-inorganic composite, and silicon carbide has high thermal stability and good density, while polyaniline serves as a material with unique fire-retardant properties.

Abstract: A process of preparing an ultra-high molecular weight polyethylene (UHMWPE) anti-wear composite material modified by a manganese phosphate nanosheet is as follows: a trihydrate manganese phosphate nanosheet and UHMWPE powder are prepared firstly, and then the trihydrate manganese phosphate nanosheet is mechanically mixed with UHMWPE powder to form mixed powder; finally, the mixed powder is heated, molded, melted, and solidified using a hot-pressing method; and after cooling and demolding, the modified UHMWPE anti-wear composite material is obtained. Since the trihydrate manganese phosphate nanosheet can form a manganese phosphate film during a friction process, the manganese phosphate film can effectively reduce the deformation and tearing of friction surfaces of materials, thereby improving the anti-friction and anti-wear performance of UHMWPE. The friction coefficient, wear depth, and width of the UHMWPE anti-wear composite material under dry friction conditions are significantly improved.

Abstract: A titanium dioxide micro-nanocontainers, corrosion-resistant waterborne epoxy coatings and preparation method thereof, including preparation steps as follows: TiO2 micro-nano spheres are synthesized by applying hydrothermal method; a polyaniline layer doped with molybdate ions is deposited on the surface of TiO2 micro-nano spheres by adopting the method of in-situ chemical polymerization, TiO2/PANI-MoO42? micro-nano-spheres are obtained, then, polydopamine is encapsulated on the surface of TiO2/PANI-MoO42? micro-nano spheres to obtain titanium dioxide micro-nanocontainers; next, antirust filler, defoamer, dispersant and thickener are added into waterborne epoxy emulsion, then titanium dioxide micro-nanocontainers are added in the waterborne epoxy emulsion for dispersing and grinding, filtering and encapsulating to obtain component A; the waterborne epoxy curing agent and deionized water are mixed in proportion to obtain component B; component A is stirred, then it is mixed with the component B in proportion,

Abstract: A titanium dioxide micro-nanocontainers, corrosion-resistant waterborne epoxy coatings and preparation method thereof, including preparation steps as follows: TiO2 micro-nano spheres are synthesized by applying hydrothermal method; a polyaniline layer doped with molybdate ions is deposited on the surface of TiO2 micro-nano spheres by adopting the method of in-situ chemical polymerization, TiO2/PANI-MoO42? micro-nano-spheres are obtained, then, polydopamine is encapsulated on the surface of TiO2/PANI-MoO42? micro-nano spheres to obtain titanium dioxide micro-nanocontainers; next, antirust filler, defoamer, dispersant and thickener are added into waterborne epoxy emulsion, then titanium dioxide micro-nanocontainers are added in the waterborne epoxy emulsion for dispersing and grinding, filtering and encapsulating to obtain component A; the waterborne epoxy curing agent and deionized water are mixed in proportion to obtain component B; component A is stirred, then it is mixed with the component B in proportion,

Abstract: This invention provides a preparation method of solid self-lubricating material with high temperature resistance, including steps described as follows: first, mixing polymer matrix resin and nano lubricating filler to compose a uniform raw material powders; then, placing the raw material powders in the cavity of hot-press die; keeping the temperature for 90-120 min at the first prepressing temperature, controlling the hot-pressing pressure under the third pre-loading pressure, and gradually increasing the temperature to the solid-phase molding temperature of the material; gradually reducing the temperature to the first preloading temperature after the solid-phase molding is completed; next, removing the pressure, finally, obtaining the solid self-lubricating material by naturally cooling to normal temperature and demoulding.

Abstract: A titanium dioxide micro-nanocontainers, corrosion-resistant waterborne epoxy coatings and preparation method thereof, including preparation steps as follows: TiO2 micro-nano spheres are synthesized by applying hydrothermal method; a polyaniline layer doped with molybdate ions is deposited on the surface of TiO2 micro-nano spheres by adopting the method of in-situ chemical polymerization, TiO2/PANI-MoO42? micro-nano-spheres are obtained, then, polydopamine is encapsulated on the surface of TiO2/PANI-MoO42? micro-nano spheres to obtain titanium dioxide micro-nanocontainers; next, antirust filler, defoamer, dispersant and thickener are added into waterborne epoxy emulsion, then titanium dioxide micro-nanocontainers are added in the waterborne epoxy emulsion for dispersing and grinding, filtering and encapsulating to obtain component A; the waterborne epoxy curing agent and deionized water are mixed in proportion to obtain component B; component A is stirred, then it is mixed with the component B in proportion,

Abstract: A method for preparing an aluminum carbon composite by using a foam aluminum includes the following steps. Electromagnetic stirring and drying are performed on the foam aluminum and a carbon material to obtain a foam aluminum preform; an aluminum block is melted into aluminum liquid, the aluminum liquid is adjusted to qualified aluminum liquid, the qualified aluminum liquid is cooled to a temperature of 620˜650° C. and keeping the temperature to make the qualified liquid aluminum become a semi-solid state, then the foam aluminum preform is pressed into the qualified liquid aluminum and performing electromagnetic stirring. A mold is heated to a certain temperature and extrusion molding is performed to obtain a carbon reinforced aluminum matrix composite material. The method overcomes a problem that the carbon material and the aluminum matrix have poor wettability and are not easy to be added into the aluminum matrix.