9results about How to "Prevent re-oxidation" patented technology

The invention belongs to the field of chemical energy materials, and discloses a modified lithium iron phosphate positive electrode material and a preparation method thereof.The preparation method comprises the steps that a lithium source, an iron source and a zinc source are added into water to be stirred and dissolved, then a phosphorus source, a network gelling agent and an initiator are added, stirring reaction is conducted, and wet gel is obtained; and pre-decomposing the wet gel, grinding and sintering to obtain the modified lithium iron phosphate positive electrode material. According to the invention, Zn is introduced into the lithium iron phosphate positive electrode material, so that the olivine structure of the positive electrode material and the purity and consistency of the lithium iron phosphate positive electrode material are ensured; and Zn is oxidized into Zn < 2 + > to be doped into a lithium iron phosphate structure, so that vacancies are formed, the lithium ion diffusion rate and conductivity of the lithium iron phosphate positive electrode material are improved, the rate cycle performance of the prepared modified lithium iron phosphate positive electrode material is stable, and excellent discharge performance and stable rate cycle performance can be kept at low temperature.

The invention relates to the technical field of steel smelting, in particular to a zinc-aluminum-magnesium coating product and a preparation method thereof. The method comprises the following steps: carrying out hot rolling and coiling on a plate blank to obtain strip steel; pickling the strip steel to obtain a steel substrate; preheating the surface of the steel substrate, and then annealing to obtain a pretreated steel substrate; carrying out hot galvanizing on the pretreated steel substrate to obtain a zinc-aluminum-magnesium coating product; the annealing comprises annealing by adopting a heating section, a soaking section and a cooling section, and the heating section comprises heating by adjusting the air-fuel ratio according to the real-time temperature of different heating sections; the cooling section is used for cooling under the atmosphere condition of nitrogen and hydrogen mixed gas; the cooling section further comprises a furnace nose area, and the dew point temperature of the furnace nose area is smaller than or equal to-30 DEG C; according to the method, the problems of residual oxide scale on the surface of the steel substrate and selective oxidation of alloy elements in the annealing stage can be avoided, so that a zinc-aluminum-magnesium coating product without the surface plating leakage defect can be finally obtained.

The annealing and tinning device for copper wire processing comprises a bottom plate, an annealing box and a tinning box, the annealing box is welded to the top of the bottom plate, and the tinning box is fixed to the right side of the annealing box; according to the copper wire annealing and tinning device, the annealing box, the tinning box, the connecting pipe and the anti-oxidation box are adopted to form the copper wire annealing and tinning device, and the heating cavity, the heat preservation cavity and the cooling cavity of the annealing box are each provided with the guide roller set composed of the multiple guide rollers, so that copper wires passing through the annealing box are circuitously conveyed in a snakelike structure; according to the tin plating tank, the time for copper wires to pass through the annealing box is delayed to the maximum extent, and the annealing and cooling effects of the copper wires are guaranteed; the connecting pipes are arranged in the annealing box and the tin plating box, and the clamping blocks with the semicircular grooves are arranged on the opposite surfaces of the left support and the right support which are arranged in the anti-oxidation box; the semi-circular groove of the clamping block can erase an oxide layer on the surface of the copper wire through the friction surface, and the copper wire is prevented from being oxidized again through inert gas introduced through the gas inlet pipe.

The utility model discloses maintenance equipment for a copper bar polishing and grinding machine, and particularly relates to the field of copper bar polishing machines, the maintenance equipment comprises a base, an annular painting mechanism used for polishing a copper bar is fixedly connected in one side of the base, the annular painting mechanism comprises a driving motor, the driving motor is connected with a driving roller through an output shaft, and the driving roller is connected with the base. The outer part of the driving roller is connected with an outer shell through a bearing; the interior of the outer shell is connected with a plurality of sets of limiting rollers through bearings, the inner sides of the limiting rollers are movably connected with storage rings and telescopic rods, and the other sides of the telescopic rods are fixedly connected with brush heads and springs; the driving motor drives the driving roller to rotate, the storage ring is driven to rotate along the limiting roller, the brush head is driven to brush the surface of the copper bar, meanwhile, the spring and the telescopic rod drive the brush head to be attached to the surface of the copper bar all the time, and therefore the surface of the copper bar can be coated with anti-oxidation paint, the copper bar is maintained, and the copper bar is prevented from being oxidized again; and the service life of the copper bar is prolonged.

The present invention discloses a forming process for reducing the wear of hot forging dies, the forming process includes the processes of blanking, blank heating, upsetting and die forging, wherein when the upsetting piece is transferred to the die forging process, the surface of the upsetting piece is subjected to rapid cooling treatment, so that the surface temperature of the upsetting piece is rapidly cooled and the surface temperature of the upsetting piece is higher than the final forging temperature, and then a lubricant is evenly sprayed on the surface of the upsetting piece, followed by die forging. The forming process of the present invention can effectively reduce the temperature rise of the die and the temperature gradient of the core surface, so that the stress of the die is reduced during the forging cycle, thereby increasing the life of the forging die.

According to the hydrogen pipeline device capable of reducing the oxygen content of the molybdenum powder and improving the thermal efficiency of the reduction furnace, before hydrogen is introduced into an inlet of a furnace tube heating furnace, waste heat of the inlet of the furnace tube is utilized, the heat exchanger is combined to preliminarily heat the hydrogen in the first pipeline, and the hydrogen can be generally heated to about 300 DEG C; and after primary heating, hydrogen is introduced into an outlet of the furnace tube, and then the multi-tube heating furnace is used for heating. At the moment, as the hydrogen has obtained waste heat, when the hydrogen is heated again, the capital cost is saved while the heating efficiency is greatly improved. In addition, the cooling device is arranged at the outlet of the furnace tube, the prepared molybdenum powder is rapidly cooled, the molybdenum powder is prevented from being oxidized, and the purity of the molybdenum powder is guaranteed.

This application relates to the field of welding robots and discloses a tracked mobile welding robot device, including a mobile walking mechanism. A welding execution mechanism is mounted on the mobile walking mechanism, which includes a programmable controllable robotic arm. A welding torch is mounted at the end of the robotic arm. A welding wire feeding mechanism is also mounted on the mobile walking mechanism, comprising a welding wire spool and a welding wire grinding component. The welding wire grinding component includes a sanding sleeve, the inner wall of which is lined with sandpaper. The sandpaper is fitted onto the welding wire and is responsible for grinding the oxide layer on the surface of the welding wire. This invention, through the cyclical, pre-reserved wire pulling and releasing, allows the welding work to proceed in an orderly manner. This ensures that the thickness of the weld wire is the required set thickness and is uniform; it also ensures that the wire feed is continuous and uninterrupted during the welding process; and it saves time waiting for wire grinding.

The invention relates to the technical field of nickel-chromium wire drawing production, and discloses an annealing and anti-oxidation device, comprising a box body, and also comprising a scraping device, a smearing device, a protective device and a discharging device; the inner wall of the box body is respectively installed with a wire drawing machine, a guide roller, an annealing box and a fixed plate, the right side of the fixed plate is rotatably connected with a turntable, the inner wall of the turntable is fixedly connected with a brush plate, and the upper surface of the turntable is fixedly connected with a material box; the scraping device comprises a support plate, a fixed block, a moving rod, an elastic scraper, an inclined block, a moving plate, a moving ring, an arc block and a guide plate, the support plate is fixedly connected to the inner wall of the wire drawing machine, the fixed block is fixedly connected to the right side of the support plate, and the moving rod is slidably connected to the inner wall of the fixed block. The invention can scrape off the oxide on the surface of the nickel-chromium wire to prevent the oxide from entering the subsequent annealing box and falling off.

The utility model discloses an anti-oxidation wiredrawing annealing device based on vacuum sealing, which relates to the technical field of wiredrawing annealing and comprises a wiredrawing device, one side of the wiredrawing device is connected with an annealing box through bolts, one side of the annealing box is fixedly connected with a thermal insulation layer, and one side of the thermal insulation layer far away from the wiredrawing device is fixedly connected with a cooling box. And one side of the cooling box is rotationally connected with a winding table, the side, away from the winding table, of the wire drawing device is rotationally connected with a containing disc, and an air suction hole is formed in the top end of the annealing box. The wiredrawing annealing device based on vacuum sealing oxidation prevention disclosed by the utility model has the advantages that a small amount of oxide generated on the surface of a metal material subjected to wiredrawing operation is cleaned through the cleaning module, and meanwhile, a small amount of generated heat can be absorbed and conducted out of the device through the heat absorption plate and the heat conduction column; the metal material is effectively prevented from being oxidized again, and the wire drawing quality of the metal material is improved, so that the quality of a finished product is improved, and the loss of raw materials is reduced.