47results about How to "No anisotropy" patented technology

A composite chromium electroplated film containing hard particles in network microcracks, the microcracks account for 10 to 20 area % of the surface, the distribution density of microcracks is 1,200 to 2,500 lines / cm, and the amount of the above-mentioned hard particles 1 to 15% by mass / 100% by mass of the above-mentioned entire plating film. This composite chrome plating provides excellent wear and mar resistance and low impact to mating parts.

To provide a halogen-free flame retardant composition containing no antimony, phosphorus and phosphorus compounds at all, a non-halogen flame-retardant resin composition of environmental type ideal for disaster prevention made of the flame retardant composition, which causes little carbon monoxide (CO) during combustion while having high flame retardance, and molded products, electric wires, cables, fiber or fiber post-processed products made of the resin composition. The flame retardant composition comprises a mixture of (A) a resin having an average particle diameter of not more than 1000 μm selected from wholly aromatic polyamide, polyimide, polyamideimide, a copolymer of the wholly aromatic polyamide, the polyimide or the polyamideimide or a mixture of the above mentioned polymers and (B) a metal hydrate. The flame-retardant resin composition contains 50 to 200 parts by mass of the flame retardant composition to 100 parts by mass of a thermoplastic resin or a thermosetting resin.

The invention discloses a method for rolling and molding a low-oxygen content aero titanium alloy precision sheet. The low-oxygen content aero titanium alloy precision sheet is obtained by rolling twice by using a twenty high rolling mill. The method comprises the following steps of: rolling by using the twenty high rolling mill, degreasing, recrystallization annealing, cold rolling with the twenty high rolling mill again, degreasing, stress relief annealing, stretcher leveling, longitudinal cutting / transverse cutting, inspecting, packaging, and the like, wherein aero titanium alloy plates, such as TC4, TA15 and the like, with the thickness of 1-5 mm, are used as raw materials. The thickness tolerance of the titanium alloy precision sheet is + / -0.005 mm, the camber is 0.3-1 mm / 1m, the surface quality is No.2B, the surface smoothness is up to 1-2 I-Unit, the grain size is up to 5-6 grades, the surface has no surface contamination layer (such as an oxygen-enriched layer, an alpha layer and the like), the internal stress is distributed uniformly, no anisotropy exists, and the subsequent plastic forming feature is favorable. The invention has the advantages of easy production method, low cost, high product quality and high production efficiency.

The invention relates to a gob-side entry retaining roadside support system and a construction method thereof. A rhombic steel bar net is arranged on one side of a gob, an air drum cloth is laid on the inner side of the rhombic steel bar net, light aggregate concrete is adopted to perform guniting treatment on the air drum cloth and the rhombic steel bar net, a windtight light aggregate concrete spray layer is formed on the side of the gob, the thickness of the light aggregate concrete spray layer is 200-500 mm, and the other side of the light aggregate concrete spray layer is close to a steel tube concrete pier stud supporting device. A steel tube concrete pier stud is formed by filling an empty steel tube with concrete; through a restraint effect of a steel tube casing, internal concrete is in a three-dimensional stressed state, the geometrical stability of the steel tube wall is enhanced, and the bearing capacity of the steel tube concrete pier stud is improved. According to the gob-side entry retaining roadside support system, a top plate can be supported in high strength, coal mining efficiency is effectively improved, and an operation environment in a roadway is improved; the steel tube concrete pier stud can be recycled through a special thrust device, and the roadway retained cost is reduced.

The invention provides a novel composite material cable trough box for rail transit. The novel composite material cable trough box comprises a cable trough body (1) and a cable trough cover (2) which covers the upper surface of the cable trough body (1), wherein the cable trough box is prepared from the following components in parts by weight by virtue of a pultrusion process: 15-35 parts of unsaturated polyester resin, 15-35 parts of aluminum hydroxide micro powder, 40-70 parts of glass fiber, 0.5-1.5 parts of mold releasing agent, 0.1-0.2 part of ultraviolet absorbent and 3-10 parts of additives. The cable trough box provided by the invention has the advantages of high flame-retardant performance, low smoke toxicity, high strength, low density, good aging resistance, convenience in assembly, low cost, short production cycle and the like.

The invention provides a manufacturing method of an arc additive of a titanium alloy structural part. An arc wire feed additive manufacturing method is used to carry out welding of each layer of ring members, i.e., a wire feeder feeds welding wires, the welding wires are melted by a welding gun to weld, and ring welding beads from the inside to the outside are sequentially lapped to form a layer of ring members; and then one thickness of layer of the welding gun is increased, and the welding method is repeated to form another layer of ring members, and so forth; and finally, a plurality of layers of ring members are overlapped to form a titanium alloy structural part. The welding forming part provided by the invention has a fine and uniform grain size and good mechanical properties, and can meet or exceed the level of congruent castings, and the product has a short development cycle and high processing efficiency.

The invention relates to a method for preparing a particle-reinforced aluminum-based composite material adopting hot-pressing sintering under an atmospheric atmosphere. The invention belongs to the field of powder metallurgy, in particular to the method for preparing the particle-reinforced aluminum-based composite material adopting hot-pressing sintering under the atmospheric atmosphere. The method aims to overcome the defects of complex process, high cost and low production efficiency of an existing composite material preparation process adopting the hot-pressing sintering. The method comprises the following steps that 1, ball-milling is carried out to mix powder, specifically, the ball-milling is carried out on ceramic particle reinforcement and an aluminum-based body for mixing the powder to obtain the mixed powder; 2, cold pressing is carried out to prepare a prefabricated body, specifically, step-by-step compaction is carried out on the mixed powder by adopting a graphite die soas to obtain the prefabricated body; and 3, the hot-pressing sintering is carried out on the prefabricated body under the atmospheric atmosphere, the graphite die is transferred into the air after thesintering is completed till the die is naturally cooled to the room temperature, and the die is removed to obtain the particle-reinforced aluminum-based composite material. The method is used for preparing the particle-reinforced aluminum-based composite material.

The present invention proposes a multi-layer single-channel continuous arc additive manufacturing method and system for metal structural parts. The method adopts a welding machine as a heat source, a metal wire as a forming material, and the welding device is driven by a robot according to a planned continuous spiral. Slicing path motion for arc additive manufacturing on a substrate. First, select the welding wire and substrate needed to form a specific metal structure; then generate a continuous spiral slice path; finally, the welding gun moves according to the generated continuous spiral path under the drive of the robot, and the servo system drives the welding gun mechanical arm according to the calculated spiral path, The welding torch is driven by the welding torch manipulator to print a single-pass weld seam along a predetermined trajectory, and the height of the welding torch from the substrate is gradually increased during the printing process according to the helical path. The continuous spiral path makes the height of the welding torch from the substrate gradually increase during the entire 3D printing process, but keeps the dry elongation constant, and the arc will not be extinguished during the entire printing process, and finally a metal structure with excellent performance is formed.

The invention provides a functional membrane prepared by using functionalized organic powder, a low-temperature non-damaging manufacturing method and its application. The organic powder membrane material is composed of functionalized organic powder and polytetrafluoroethylene (PTFE). The heated supersonic airflow opens the polytetrafluoroethylene molecular chain, bonds the functionalized organic powder, and extrudes the air in the powder to form a continuous cake. Layer-film hot-pressing composite process forms a low-porosity, uniform-thickness film. This method can continuously roll-to-roll to produce micron-sized organic membranes, which can maximize the physical and chemical properties of organic powders and prevent performance damage or anisotropy caused by recrystallization due to high temperature or introduction of solvents into the film. . No solvent is introduced in the manufacturing process, which avoids the problems of environmental pollution, high energy consumption and uneven density of membrane materials caused by the solvent drying process.

The invention provides a cable duct box device for rail transportation. The cable duct box device comprises a plurality of cable duct box units sequentially connected end to end and made of composite material, and sealing assemblies arranged at the joints of the cable duct box units. Each sealing assembly includes a sealing pressing strip (2) and a cushion block (1). Each cushion block (1) is arranged at the bottom of the corresponding joint of the cable duct box units, each sealing pressing strip (2) seals and presses the upper surface and the side faces of the corresponding joint of the cable duct box units, and each sealing pressing strip (2) and the corresponding cushion block (1) are detachably connected. The cable duct box device for rail transportation has the advantages of high flame retardancy, low smoke toxicity, high strength, low density, good aging-resistant performance, convenient installation, low cost, short production cycle, and the like.