10results about How to "Uniform oxidation" patented technology

The invention relates to a device and a method for photoelectrochemical mechanical polishing of a semiconductor substrate aiming at electric field uniform arrangement and light field intercoordination, and the device comprises a rack, a machine body unit, a polishing disc assembly, a conductive base, an LED ultraviolet light source, an electrochemical workstation and a moving assembly, the machine body unit is used for loading and unloading the polishing disc assembly; the electrochemical workstation and the LED light source power supply respectively supply power to the conductive base and the LED ultraviolet light source in the machining process, the LED ultraviolet light source is fixed on the polishing disc and acts on a semiconductor substrate workpiece in machining together with the polishing disc in the workpiece polishing process, and the semiconductor substrate workpiece is bonded on the conductive base. The LED light source directly irradiates the surface of a machined workpiece, the distance between the light source and a polishing solution is effectively shortened, the effect of a light field is improved, meanwhile, the intensity of the light field in different directions along the radius is adjusted, the light field and an electric field applied to the workpiece act together to guarantee uniform oxidation of the surface of the workpiece, and the flatness of the machined workpiece is guaranteed.

The invention discloses a carbon fiber anodized surface treatment device and a surface treatment method, the device includes an electrolysis unit for carbon fiber anodized surface treatment and a post-electrolysis waste gas treatment unit. The device can flexibly adjust the spacing of the impregnation rollers in the electrolytic cell, control the electrolysis time, oxidize each single filament evenly, and have a good electrolytic oxidation treatment effect. Active functional groups such as oxygen and nitrogen are introduced into the surface of the carbon fiber, and the interlayer shear strength of the carbon fiber composite material is significantly improved; the equipment manufacturing cost is low; the operation is simple, and it is easy to process a large number of carbon fiber bundles, which is suitable for batch production; the electrolysis device is equipped with an inlet suction hood, an outlet suction hood, and a movable cover plate, and a fan is used to extract the ammonia waste gas generated by the electrolysis device to the post-electrolysis waste gas treatment device equipped with a foldable cover plate to produce an acid-base reaction, effectively blocking the escape of waste gas, reducing environmental pollution, avoiding harm to the health of operators during operation, and ensuring safe production.

The invention belongs to the field of ferrous metallurgy, and particularly relates to a vanadium-titanium pellet preparation method which comprises the following steps: a) pelletizing a first mixture to obtain a green pellet core; wrapping the surface of the green pellet core with a second mixture to obtain a green pellet; the first mixture is a mixture of superfine fraction high-titanium vanadium-titanium magnetite concentrate and bentonite, and the second mixture is a mixture of superfine fraction high-titanium vanadium-titanium magnetite concentrate, fine-ground blast furnace gravity ash and bentonite; and b) sequentially drying, preheating and roasting the green pellets to obtain the vanadium-titanium pellets. According to the method, it can be guaranteed that pellets produced by the fine-fraction high-titanium vanadium titano-magnetite can form good air hole channels during preheating and roasting, uniform oxidation in the preheating and roasting process is guaranteed, the compressive strength of the pellets is improved, the raw material conditions of a blast furnace are stabilized, and blast furnace smelting is strengthened.

A preparation method of vanadium-titanium pellets comprises the following steps: a) siderite is screened and classified, and the part smaller than 6 mm is subjected to fine grinding treatment, so that the siderite subjected to fine grinding is obtained; b) mixing the finely ground siderite obtained in the step a) with vanadium-titanium concentrate and bentonite, and pelletizing to obtain green pellets with the pellet fraction of 8-16mm; and c) distributing the green pellets with the pellet fraction of 8-16 mm obtained in the step b), drying, preheating, roasting and cooling in sequence to obtain the vanadium-titanium pellets. Compared with the prior art, the preparation method of the vanadium-titanium pellets provided by the invention has the advantages that siderite is introduced as a raw material for graded preparation, and overall better interaction is realized through specific process steps and conditions, so that a good pore channel can be formed during preheating and roasting of the pellets produced by fine-fraction high-titanium vanadium-titanium magnetite; uniform oxidation in the preheating and roasting process is guaranteed, the compressive strength of the pellets is improved, cheap siderite resources can be effectively utilized, and the production cost is reduced.

The invention relates to the technical field of metal surface treatment, in particular to a preparation method of a self-cleaning titanium and titanium alloy filter screen for filtering moxa smoke. The method comprises the steps that S1, direct current is introduced into the titanium and titanium alloy filter screen for heat treatment, and a high-activity metastable structure is formed on the surface of the titanium and titanium alloy filter screen; s2, the titanium and titanium alloy filter screen is subjected to anodic oxidation treatment, and a continuous multi-stage micro-nano rough structure is generated on the surface of the metastable structure to cover the surface of the titanium and titanium alloy filter screen; and S3, the surface of the titanium and titanium alloy filter screen is subjected to fluorosilane modification, and a uniform hydrophobic and oleophobic coating is formed on the surface of the multi-stage micro-nano rough structure. A metastable structure is formed on the surface of the titanium and titanium alloy filter screen, so that a continuous and multi-stage micro-nano rough structure is conveniently formed in subsequent anodic oxidation treatment. A firm and uniform hydrophobic and oleophobic coating is formed on a large surface area after fluorosilane modification, and the self-cleaning function is improved.

The invention discloses a method for preparing a graphene heat-conducting film, which comprises the following steps: 1) adding petroleum coke powder into concentrated sulfuric acid, adding potassium permanganate, and reacting to obtain oxidized petroleum coke; and 2) dispersing the oxidized petroleum coke prepared in the step 1) in deionized water, and homogenizing into single-layer oxidized petroleum coke slurry. According to the invention, the technical defect of low heat conductivity coefficient of the graphene film caused by non-uniform graphite oxidation in the prior art is at least partially overcome.

A low-lithium-nickel mixed NCMA quaternary cathode material precursor, with a chemical formula of Ni a Co b Mn c Al d OOH, the preparation method includes: preparing Ni, Co, Mn metal liquid, preparing a mixed solution of aluminate and sodium hydroxide, preparing a precipitant and a complexing agent; adding pure water, precipitant and complexing agent to the kettle to prepare a bottom liquid; keeping stirring, introducing protective gas, adding metal liquid, precipitant, mixed solution and complexing agent to the kettle for co-precipitation; overflow flows to the buffer tank, and the overflow slurry temperature is 45~55℃; ozone is introduced into the buffer tank, and the slurry is pumped back to the reactor after oxidation, and the reflux slurry temperature is 70~85℃; when the particle size grows to 3.0~4.0um, stop feeding the liquid; filter, wash and dry the co-precipitated product to obtain a NCMA quaternary positive electrode material precursor with low lithium nickel mixed arrangement. The present invention can avoid Ni 2+ With Li + The mixed arrangement has low energy consumption in preparation and controllable production cost, which is conducive to industrial production.

This invention discloses a modular, controllable atmosphere high-temperature oxidation device for the recovery of substandard sponge zirconium, relating to the fields of nuclear fuel cycle and materials technology. The device includes: a furnace body system, comprising, from the outside to the inside, a steel outer shell, a refractory insulation layer, and a detachable furnace liner; multiple independently controlled heating zones arranged along the furnace body axis, each equipped with an independent heating element and thermocouple; an atmosphere control system including nitrogen and oxygen sources, an inert gas source, a mass flow controller, and a mixer; a sealing and cooling system employing a high-temperature sealing ring and a double-layer furnace shell design, with circulating cooling water flowing through the interlayer; and an automatic control system equipped with a temperature-atmosphere-time automated control program for fully automated operation and remote monitoring of the oxidation process. The device provided by this invention can achieve efficient and uniform oxidation treatment of irregular porous sponge zirconium within the range of 500-1000℃, transforming it into zirconium oxide with consistent physical properties.

The application discloses a preparation method of a sodium ion battery hard carbon negative electrode material based on oxygen-containing functional group micropore structure control, and comprises the following steps: S1, alkalization treatment: biomaterial raw materials are soaked in an alkaline solution for reaction, and then filtered, washed with water and dried to obtain a first precursor; S2, oxidation treatment: soaking in an oxidant solution, and then filtering and drying to obtain a second precursor; S3, preparation of an oxidized precursor: oxidation is carried out in an oxygen atmosphere to obtain the oxidized precursor; S4, low-temperature sintering of a pre-carbonization material: low-temperature sintering is carried out in a protective atmosphere to obtain the pre-carbonization material; S5, refinement treatment of the pre-carbonization material: the pre-carbonization material is crushed to obtain a refined pre-carbonization material; S6, purification of the pre-carbonization material: acid washing, centrifugation, water washing and drying are carried out to obtain an acid-washed and purified pre-carbonization material; and S7, high-temperature sintering: high-temperature sintering is carried out in a protective atmosphere to obtain the sodium ion battery hard carbon negative electrode material. The application has the characteristics of high capacity, high first efficiency and simple process.

The present invention relates to a track structure suitable for a soft solder crystal bonding machine in the field of welding-related technical fields. The edge of the H-track is raised on the original H-track structure, and the original cover plate covering the H-track is changed into a splicing structure embedded in the track. When the mixed gas is filled, it can not only be evenly dispersed to the inner cavity of the H-shaped track, thereby forming protection on the surface of the frame, but also, due to the embedded cover plate, the mixed gas in the cavity is heated and rises linearly along the side, thereby filling the side contact surface of the H-shaped track and the embedded cover plate and forming a wind wall. Compared with the prior art, it effectively prevents air from entering the track cavity from the side, thereby delaying the oxidation of the copper frame in the track; in addition, with the setting of a segmented inflation pipe, while ensuring the stability of the hydrogen and nitrogen gas supply pipe, the leakage, blockage and the like of the hydrogen and nitrogen gas supply pipe can be monitored in real time, so that the abnormality of the hydrogen and nitrogen gas supply pipe can be discovered in time, thereby further protecting the copper frame in the cavity and making it less likely to be oxidized.