16results about How to "Low shear strength" patented technology

The invention discloses a self-lubricating high-corrosion-resistance composite coating as well as a preparation method and application thereof, and belongs to the technical field of composite coating materials. The preparation method of the self-lubricating high-corrosion-resistance composite coating comprises the following steps: preparing a ceramic-fluoride-based composite coating on the surface of a metal substrate to obtain an intermediate material; the intermediate material is placed in liquid formed by heating and melting the solid-liquid reversible lubricating phase to be subjected to vacuum impregnation, so that the solid-liquid reversible lubricating phase permeates into the structural defects of the ceramic-fluoride-based composite coating; and then cooling and solidifying to solidify the solid-liquid reversible lubricating phase and remain in the structural defect. The preparation method is simple, rapid and efficient, the composite coating which is suitable for seawater or seawater-atmosphere alternating environment and integrates the self-lubricating function and the strong anti-corrosion function can be obtained, and the composite coating has the low friction coefficient and the excellent anti-corrosion performance and can be used for preparing ocean engineering equipment.

The present invention discloses a deep-sea mining plume sedimentation-promoting device and method utilizing waste heat of equipment, the deep-sea mining plume sedimentation-promoting device comprising a ore collecting box, a heat exchanger, a tail flow discharge port and a hydraulic oil tank; a ore collecting box is provided with a ore particle collecting net box and an axial flow pump, the ore particle collecting net box is used to separate ore particles; the axial flow pump is used to drive a mixed low-temperature tail flow of seawater and sediment to enter a coolant inlet of a heat exchanger through an outlet of the ore collecting box, a hydraulic oil tank is connected to the bottom of the heat exchanger, and two coolant outlets of the heat exchanger are connected to a pair of tail flow discharge ports; the heat exchanger of the present invention can directly cool down high-temperature hydraulic oil, thereby improving the heat dissipation efficiency of the hydraulic system from the root; in addition, the bent pipeline, the baffle ring plate and the baffle disc plate inside the heat exchanger shell can extend the length of the coolant flow channel, further enhance the convective heat transfer effect, and ensure that the hydraulic oil can be fully cooled down.

The invention discloses an optimization process for preparing hydrolysis-resistant PET (polyethylene terephthalate) master batch. The optimization process comprises the following steps: S1, pretreating raw materials; s2, low-temperature pre-dispersion: adding the dried raw materials weighed according to the formula proportion into a high-speed mixer, so that the anti-hydrolysis agent and the auxiliary agent are uniformly attached to the surface of the PET base material to form a premix; s3, mild extrusion granulation: melting and mixing the premix through a twin-screw extruder, and extruding the premix into filaments through a die head; s4, the filaments are rapidly cooled and shaped through a cooling water tank, and secondary cross-linking is avoided; s5, pelletizing by adopting a pelletizer to obtain primary master batches; s6, the primary master batch is subjected to vacuum drying, surface moisture is removed, and the anti-hydrolysis PET master batch is obtained.The thermal degradation of a PET base material and the advanced reaction of an anti-hydrolysis agent are reduced, the intrinsic viscosity of the master batch is stable, and the anti-hydrolysis efficiency is improved.

The utility model provides a kind of pull tab connecting piece and thermal superimposed wall, including the pull tab joint and single-head pull tab of being connectable, the pull tab joint is rectangular sheet, the pull tab joint is set with through-hole in one end away from the single-head pull tab, the pull tab joint is set with strip slot in another end close to the single-head pull tab, the end of single-head pull tab close to the pull tab joint is formed with protrusion, the protrusion can be connected with the strip slot clearance hook, the end of single-head pull tab away from the pull tab joint is set with mounting hole.The utility model can realize the production of low thermal conductivity and low cost material, avoid the risk of forming thermal bridge, improve the thermal performance of thermal superimposed wall.

A power semiconductor module (1) comprises a circuit substrate (10), a power semiconductor element (19) including a semiconductor substrate (20), and at least one joint (5). The at least one joint (5) comprises a first metal component (12) away from the semiconductor substrate (20), a second metal component (23) close to the semiconductor substrate (20), and a joint layer (15) for joining the first metal component (12) and the second metal component (23) to each other. At the same temperature, the 0.2% yield strength of the first metal component (12) is smaller than the 0.2% yield strength of the second metal component (23), and is smaller than the shear strength of the joint layer (15).

The invention discloses rubber fiber particles capable of improving the mechanical property of a soil body and a preparation method of the rubber fiber particles. The rubber fiber particles are composite fiber material particles of rock fibers, rubber and TPU. The rubber fiber particles provided by the invention can form fiber rubber-sand mixed soil by being doped with sandy soil, so that the mechanical property of a building material is improved. The TPU material is used for hot melt bonding of the rubber particles and the fiber material to form an integral material, the fiber rubber particles can improve the bearing capacity and shear strength of the mixed soil, and meanwhile, the integrity of a soil body can be improved.

The present invention discloses a method, component and application of improving the lubrication performance of tungsten carbide-based metal ceramic coating. The method of improving the lubrication performance of tungsten carbide-based metal ceramic coating comprises: placing the tungsten carbide-based metal ceramic coating in a marine environment and soaking it for more than 1 month. A marine self-lubricating product in a dynamic evolution appears in the coating after being soaked in the marine environment, which has a significant positive effect on the lubrication performance of the coating, and ultimately greatly improves the lubrication performance of the tungsten carbide-based metal ceramic coating. This method has been experimentally verified and discovered for the first time, so that the friction coefficient of the coating is significantly reduced while maintaining high hardness.

A large-diameter retrievable bridge plug relates to the field of oil and gas production equipment technology, including a retrieval and release assembly, a locking and releasing assembly, an anchoring assembly, a sealing assembly, and a central tube. The locking and releasing assembly includes a release sleeve, a locking ring, a pull sleeve, a conversion joint, a connecting sleeve, a retrieval diameter, a break-off ring, a release sleeve, and a release pin. The locking ring is located outside the central tube, with ratchet A on its inner side and ratchet B on the outer side of the central tube below the locking ring. The downward ratchet A and ratchet B engage to limit the upward movement of the locking ring. The pull sleeve is located below the locking ring and above the rubber sleeve assembly. The setting rebound force cannot push the locking ring upward, making the setting very reliable. The locking and releasing assembly also includes a release shovel, a fixing post, and an unlocking pin. The lower inner side of the locking ring has a conical surface A, and the upper end of the release shovel has a conical surface B. The pull sleeve and the release sleeve are connected by the unlocking pin. The upper sidewall of the pull sleeve has an elongated hole, through which the fixing post passes to connect the release shovel and the release sleeve.

The present invention proposes an anti-wear bearing oil composition and a preparation method and application thereof, wherein the components include: 96.5-97.5wt% of high viscosity index mineral oil, preferably 97.455-96.855wt%, 0.6-1.4wt% of extreme pressure anti-wear agent, 0.5-1.0wt% of pour point depressant, 1.3-1.5wt% of antioxidant, 0.1-0.15wt% of rust inhibitor and 0.001-0.05wt% of anti-foam agent. Suitable base oil and additives compatible with the base oil are selected, and the types and proportions of the additives are explored to obtain the anti-wear bearing oil composition, which has excellent extreme pressure anti-wear performance, good sludge control performance, low temperature performance and oxidation stability, and is suitable for lubrication of traction motors of railway locomotives of railway bureaus.

The invention relates to a method for designing a filling slope unit type anti-sliding retaining wall, which comprises the following steps of: dividing a slope into anti-sliding units by adopting a pulling-anchoring-separating-arranging composite structure, enabling a pull rod to penetrate through a filling area to oppositely pull a vertical retaining wall and a conical anti-pulling pier in undisturbed soil, and enabling the vertical retaining wall, the pull rod and a connecting beam to form a unit type closed structure for transmitting hoop force; and the cone uplift pier balances the gliding force of the inverted trapezoidal filling soil body, a drainage plate and a reinforced water-resisting layer are arranged below each pull rod downwards in the vertical direction, and the drainage plates are communicated to a drainage groove in the outer side of the retaining wall through a through-wall drainage pipe. The side slope retaining wall structure has the beneficial effects that the drainage plates and external drainage form a three-dimensional drainage system, and the problem that a conventional side slope retaining wall structure is only provided with drainage pipes on the surface and cannot achieve deep drainage of a filling area can be solved; the vertical retaining walls, the pull rods and the connecting beams form a unit type closed structure to transmit hoop force, the cone uplift piers balance gliding force of inverted trapezoidal filling unit soil bodies, and the anti-overturning capacity of a filling high slope and an anti-sliding wall can be improved.

This application provides an extreme pressure anti-wear hydraulic oil and its preparation method. The raw materials for preparing the extreme pressure anti-wear hydraulic oil include the following components in parts by weight: 80-90 parts by weight of base oil, 2-5 parts by weight of antioxidant, 1-3 parts by weight of rust inhibitor, 0.5-1 parts by weight of pour point depressant, and 0.2-0.5 parts by weight of extreme pressure anti-wear agent; the extreme pressure anti-wear agent is obtained by mixing boronamide and ammonium phosphate ionic liquid in a weight ratio of 1:0.5-1. The preparation method includes the following steps: (1) mixing the base oil and antioxidant in parts by weight, stirring for 10-20 minutes at a temperature of 40-50℃ to obtain a first mixture; (2) adding the rust inhibitor, pour point depressant, and boronamide and ammonium phosphate ionic liquid in parts by weight to the first mixture, heating and refining to obtain the extreme pressure anti-wear hydraulic oil. This application achieves long-term stable operation of the extreme pressure anti-wear hydraulic oil under extreme pressure conditions.

The present invention relates to the technical field of hot melt adhesives, and in particular to a polyurethane toughened phenolic resin hot melt adhesive film and a preparation method thereof, wherein the hot melt adhesive film comprises a phenolic resin, a polyurethane and a high temperature resistant filler; the polyurethane is prepared by reacting a polyol, a chain extender and an isocyanate, and according to weight parts, the polyol comprises 100 parts, the chain extender comprises 10-35 parts, and the isocyanate comprises 40-100 parts. The weight ratio of the chain extender to the isocyanate is 1:(4.0-6.0); the total weight ratio of the chain extender and the isocyanate to the weight ratio of the polyol is 1:(0.8-2.0). The polyurethane toughened phenolic resin hot melt adhesive film has the advantages of solvent-free use, environmental friendliness, low viscosity, etc., and has a more excellent impregnation effect on fibers, which is beneficial to improving the mechanical properties of composite materials.

The application discloses a preparation process of AlCrSiWN / Mo nano composite coating with high hardness and high wear resistance, and belongs to the technical field of coating. The process is that Mo element is doped in an AlCrSiWN high-hardness coating to form a nano composite coating by adopting arc ion plating technology; the preparation process comprises the following steps: firstly, an AlCrN transition layer with a columnar crystal structure is prepared; then, AlCrSiW and CrMo targets are simultaneously started; the evaporation current of the CrMo target is regulated to be 122-150 A; the self-lubricating property of Mo element and the high hardness property of the AlCrSiWN coating are synergistically used; the AlCrSiWN / Mo nano composite coating with high hardness and high wear resistance is obtained; the toughness and self-lubricating property of the coating are improved; the crack propagation is inhibited; and the friction coefficient is reduced.

The present invention discloses a self-lubricating strong anti-corrosion composite coating and its preparation method and application, belonging to the technical field of composite coating materials. The preparation of the self-lubricating strong anti-corrosion composite coating comprises the following steps: preparing a ceramic-fluoride-based composite coating on the surface of a metal substrate to obtain an intermediate material; placing the intermediate material in a liquid formed by heating and melting a solid-liquid reversible lubricating phase for vacuum impregnation, so that the solid-liquid reversible lubricating phase penetrates into the structural defects of the ceramic-fluoride-based composite coating; then cooling and solidifying, so that the solid-liquid reversible lubricating phase solidifies and remains in the structural defects. The preparation method is simple, fast and efficient, and can obtain a composite coating that integrates self-lubrication and strong anti-corrosion functions and is suitable for seawater or seawater-atmosphere alternating environments. The composite coating has a low friction coefficient and excellent anti-corrosion performance, and can be used to prepare marine engineering equipment.

The invention discloses high-temperature-resistant and wear-resistant laser cladding alloy coating powder and application thereof. The high-temperature-resistant and wear-resistant laser cladding alloy coating powder is formed by mixing gas atomization Ni-RE high-temperature alloy powder and hard phase powder according to the mass ratio of (97-99): (1-3). The gas atomization Ni-RE high-temperature alloy powder is prepared from an Inconel 718 alloy and a rare earth element according to the mass ratio of (99.8 to 99.98) to (0.02 to 0.2); the rare earth element is one or more of La, Ce and Y; and the hard phase powder is composed of Al2O3, TiO2 and WC (Wolfram Carbide). The nickel-based high-temperature alloy powder is modified, rare earth elements Ce and Y are added into the high-temperature alloy powder, and the nickel-based high-temperature alloy powder has a remarkable effect in the aspects of improving the mechanical property, the wear resistance, the corrosion resistance, the high-temperature oxidation resistance and the like of a cladding layer; and meanwhile, the optimized high-temperature alloy powder is uniformly mixed with Al2O3, TiO2 and WC, so that the wear rate of a friction matching pair can be reduced, and a crucial role is played in reducing the friction coefficient and the wear rate.