32results about How to "Change distribution status" patented technology

The invention belongs to the field of composite coating preparation, and particularly relates to a preparation method of a corrosion-resistant antibacterial and anti-biofouling multifunctional metal-based protective coating. Through the method, firstly, nano-silver is formed on a graphene oxide-OH functional group through a chemical reaction in an in-situ synthesis mode, and graphene / nano-silver composite powder is obtained through reduction; secondly, the graphene / nano-silver composite powder and metal powder are ball-milled, metal / graphene / nano-silver composite powder is formed, and then stress relief annealing is conducted under inert gas protection; and finally, the composite powder is deposited into the protective coating through a cold spraying technology. Through the method, by adjusting the chemical reaction conditions, the particle size distribution of the metal powder, the weight ratio of metal / graphene / nano-silver and the ball-milling time, the distribution state of the graphene / nano-silver in the metal-based composite coating is changed, and thus the multifunctional metal-based protective coating with good corrosion resistance, antimicrobial property and biofouling property is prepared.

The invention belongs to the technical field of forging technologies, and discloses a forging technology for an abnormal structure of a TC18 titanium alloy raw material. The forging technology comprises the following steps: a, carrying out beta forging above a phase change point on blanks by 1-2 fire, wherein forging temperature is 15-30 DEG C above the phase change point, and deformation is controlled to be between 20% and 40%; b, carrying out forging below the phase change point on the blanks by more than 2 fire, wherein the forging temperature is 20-40 DEG C below the phase change point, and the deformation is controlled to be between 15% and 30%; and c, carrying out beta forging above the phase change point on the blanks by 1 fire, wherein the forging temperature is 10-20 DEG C above the phase change point, and the deformation is controlled to be 15% and 25%. By the technology, the structure defect of fine-crystal bright bands can be avoided effectively, and TC18 titanium alloy free forge pieces can be produced in batches.

The invention discloses a composite CuNiIn powder and its preparation method and application. The composite CuNiIn powder contains a dispersion strengthening phase and a self-lubricating phase at the same time. The preparation method comprises: In powder, nickel-coated molybdenum disulfide powder, Al 2 o 3 Dispersion-strengthened Cu powder is ball-milled and mixed to obtain mixed raw materials. The mixed raw materials are centrifugally atomized and granulated by a spray drying granulator to obtain dry granules; the dried granules are vacuum sintered, and then crushed and sieved to obtain composite CuNiIn powder. The composite CuNiIn powder can be prepared into a composite CuNiIn coating containing a dispersion strengthening phase and a self-lubricating phase by a thermal spraying method. The invention changes the distribution state of the self-lubricating phase, improves the strength and toughness of the coating, effectively avoids the generation of micro-cracks in the coating, improves the self-lubricating life of the coating, and has good advantages for industries such as aeroengines and gas turbines. Value.

The invention discloses an aluminium alloy composite solder wire for arc welding and a preparation method thereof. The aluminium alloy composite solder wire comprises main materials and auxiliary materials, wherein the main materials comprise the following raw materials: 8 to 12 parts of Al, 6 to 9 parts of Si and 7 to 9 parts of Cu; and the auxiliary materials comprise the following raw materials: 5 to 7 parts of rare earth alloy, 3.5 to 6 parts of Zn, 4 to 5 parts of Mg, 2.7 to 3.8 parts of Mn, 2 to 5 parts of Ni, 4.5 to 5 parts of Ge and 3 to 5 parts of Sr. According to the invention, the aluminium alloy composite solder wire has good wetting property, ideal mechanical property and excellent shear strength, can integrate good wetting property, mechanical property and shear strength, the problem that excellent performances and advantages of solder cannot be integrated is solved, and the applicability of the solder is improved; La, Y and Ce rare earth elements are added in the formula, so that crystal grains can be refined, the distribution state of the structure is changed, the electrode potential of the solder is not changed, while the mechanical property and corrosion resistance of a soldered joint are improved; and Zn, Mg, Mn, Ni, Ge and Sr are added in the formula, and the solid-liquid phase line temperature is remarkably decreased.

The present invention provides a speed-controllable rotating water measuring automatic filling device, which includes a rotating device, a first distributing pipe, a diversion pipe group, and a water measuring power device; one end of the rotating device is connected to the water inlet at the upper end of the first distributing pipe, A number of water outlet holes are evenly arranged on both sides of the first distribution pipe with the rotation axis of the rotating device as the symmetrical center. The other end of the rotating device is connected to the water outlet of the diversion tube group. Water outlet connection. The water measuring power device inputs the water of the water supply system into the diversion tube group, and the diversion tube group inputs the water to the water inlet of the first distribution pipe through the flow channel of the rotating device, and the rotation of the rotating device drives the first distribution pipe to rotate, and the first The water outlet hole on the cloth pipe distributes water; through the first rotating cloth pipe to measure water and distribute water, it can measure water more evenly than fixed water measuring cloth, realize even distribution of water, so that water is evenly distributed and does not accumulate, and automatically Water measurement reduces manual labor intensity, and automatic operation is safe and reliable.

The invention discloses a milling and drilling combined machining cutter. The milling and drilling combined machining cutter comprises a cutter body and a cutter handle; the cutter body comprises a drilling part, a milling part and a guide part which are arranged in sequence; the guide part is connected with the cutter handle; the drilling part is positioned at the front end of the milling part; the milling part has certain conicity; the guide part comprises at least two long helical chip discharging grooves which extend from the drilling part to the cutter handle; a part, positioned between two adjacent long helical chip discharging grooves, of the cutter body forms a blade petal; the side surface, close to the long helical chip discharging grooves and opposite to the rotating direction of the cutter body, of the blade petal is provided with a cylindrical guide blade strip; the side surface, opposite to the rotating direction of the cutter body, of each long helical chip discharging groove is intersected with the milling part to form a taper long milling blade; the blade petal is provided with at least one short helical chip discharging groove which extends from the milling part to the guide part; and the milling part is intersected with the side surface, opposite to the rotating direction of the cutter body, of each short helical chip discharging groove to form a taper short milling blade. Under a composite material drilling machining condition, the milling and drilling combined machining cutter disclosed by the invention can reduce an axial cutting force so as to prevent defects of layering, cracks and burrs generated at the outlet of a machined hole.

The invention discloses a method for preparing a copper alloy composite material for electronic packaging and a product thereof. The method comprises the following steps: preparing an electroplating solution; chemically silver-plating polyurethane foam, and removing the polyurethane foam by heat treatment to obtain silver foam; The carbon nanotube / iron / nickel (CNTs / Fe / Ni) composite foam is obtained by electroplating on top, heat-treated; filled with copper powder, cold-pressed, and hot-pressed and sintered to finally obtain a copper alloy composite material. In the present invention, CNTs / Fe / Ni composite foam is used as a three-dimensional skeleton reinforcement phase, and copper powder is filled as a tough phase, and CNTs do not have a large area of ​​agglomeration inside, and its structural integrity is preserved. The copper alloy composite material prepared by the invention has high electromagnetic shielding performance, good thermal conductivity, high tensile strength, good ductility and low expansion coefficient, and meets the performance requirements of the copper alloy used for electronic packaging.

The invention discloses a process for preparing a silver tin oxide contact material through a powder rolling method. The process specifically comprises the following steps: rolling mixed powder of silver oxide into a flaky material with thickness of 0.1-0.6 mm through a rolling mill, and carrying out isostatic pressing, sintering and extruding the obtained flaky material to obtain the silver tin oxide contact material; the diameters of rollers of the rolling mill are 60-200 mm, the gap between two rollers is 0.1-0.6 mm, and the rolling speed is 2-10 m / min. According to the process disclosed by the invention, powder rolling technology is introduced into the conventional powder metallurgic method of preparing silver tin oxide, the mixed powder of silver oxide is rolled by the rolling mill to change the simple distribution state of silver particles and tin oxide particles in the conventional powder metallurgic process, and the tin oxide particles are pressed into the silver particle matrix so as to perfect the bonding strength of silver and tin oxide in the material and improve the mechanical and physical properties and electrical properties of the obtained silver tin oxide contact material.