266results about How to "Uniform composition" patented technology

The invention discloses active brazing filler metal for sealing sapphire and kovar alloy and a preparation method of the active brazing filler metal. The active brazing filler metal comprises 25.0 wt%-27.5 wt% of Cu, 1.0 wt%-6.0 wt% of Ti, 1.0 wt%-5.0 wt% of Al, 0.1 wt%-1.0 wt% of B, 0.1 wt%-0.5 wt% of rare earth element RE, RE is one or more of La, Ce, Sc, Pr, Nd and Er, and the balance is Ag. The preparation method comprises the following steps: preparing silver-based pre-alloying powder by adopting a gas atomization method, mixing the alloy powder with additive element powder in a ball milling manner, sintering by utilizing vacuum pressure to obtain an alloy ingot blank, and carrying out rough rolling, intermediate annealing and finish rolling to obtain an active brazing filler metal strip with the thickness of 0.05-0.2 mm. The active brazing filler metal is well matched with the thermal expansion coefficient of sapphire, direct brazing of sapphire and Kovar alloy can be achieved, the brazing temperature is moderate, and a brazed joint is uniform in structure and free of defects such as air holes and cracks.

The invention belongs to the technical field of thermal barrier coatings, and provides an artificial preparation method of multi-scale aero-engine environment sediment particles. The preparation method comprises the following steps: grinding CMAS original powder into mixture powder; calculating the mass of the required mixture powder according to the powder density of the CMAS original powder and the particle size of the target sediment particles; weighing the mixture powder, and pressing the mixture powder into sheets; in an air suspension furnace, tabletting and melting the mixture powder into balls by adopting a laser; and rapidly cooling to normal temperature to obtain the target sediment particles with the target particle size. The melting process of the CMAS powder is greatly improved, the gas suspension furnace and the laser are used for heating, single CMAS particles with the designed size can be obtained in a short time, the preparation time is shortened, and the preparation cost is effectively reduced.

The invention relates to the technical field of circuit substrate manufacturing, and particularly discloses a preparation method of a composite solder sheet and an AMB ceramic copper-clad plate. The composite solder sheet is composed of an active metal foil and a copper-containing layer modified on the surface of the active metal foil, and the preparation method of the copper-clad plate comprises the following steps: after the surface of the active metal foil is pretreated, the copper-containing layer is deposited to prepare the composite solder sheet, and the composite solder sheet is placed between a copper substrate and a ceramic sheet to be pressed and assembled. And performing vacuum brazing on the assembly to complete the preparation of the ceramic copper-clad plate. A composite solder sheet containing active metal is adopted, high-temperature element diffusion during vacuum brazing is utilized at the diffusion temperature to achieve alloying of a composite solder layer, and then heat preservation is conducted at the brazing temperature to achieve uniform melting of solder and wetting metallurgical reaction between the solder and copper and between the solder and a ceramic substrate. By means of the preparation method, low-cost and high-reliability preparation of the AMB ceramic copper-clad plate can be achieved, and the prepared AMB ceramic copper-clad plate also has high peel strength and lower weld porosity.

The invention discloses a recovery method of titanium alloy powder for additive manufacturing, and relates to the technical field of titanium alloy materials, the recovery method comprises the following steps: step 1, sheath material selection and processing: carbon steel with good welding performance is preferably selected as a sheath material; the size of the sheath is designed according to the actual ingot shape condition; 2, selecting raw materials, namely mixing titanium alloy spherical powder and micron-sized titanium alloy powder with the granularity of 15-300 mu m and the same brand, and performing an HIP + VAR process to obtain a titanium alloy cast ingot with more uniform material components and smaller element content range; a conventional titanium alloy powder hot isostatic pressing process needs a high treatment temperature which is generally between 930 DEG C and 1050 DEG C, the density of a blank after hot pressing is required to be close to 100%, according to the method, the material hot isostatic pressing treatment temperature is required to be 600 DEG C to 650 DEG C, an electrode blank with certain strength meeting VAR smelting can be obtained, energy consumption is reduced, and meanwhile the requirement for the performance of hot isostatic pressing equipment is extremely low.

The invention provides a method for measuring the object positions of gold ores above the medium fraction in heavy sand and application of the method, and belongs to the field of mineral processing.The method for measuring the object positions of the gold ores above the medium fraction in the heavy sand comprises the following steps that gold ores above the medium fraction in a heavy sand sample to be measured are selected, and the length, width and thickness of each gold ore are measured; calculating the observation volume of each gold mineral; a volume correction coefficient and color are introduced to calculate the mass of each gold mineral; and calculating the grade of the gold minerals above the medium grade. According to the method, the observed volume of the gold mineral is corrected by introducing the volume correction coefficient, so that the real volume closer to the reality is obtained, the density of the gold mineral is corrected through color formation, so that the real density closer to the reality is obtained, and the mass of the gold mineral obtained through volume and density calculation is more accurate; therefore, the calculated grade is more accurate.

The invention belongs to the related technical field of metal fuels, and discloses an aluminum-lithium alloy powder fuel and a preparation method thereof, the aluminum-lithium alloy powder fuel is prepared from the following raw materials in percentage by mass: 2-10% of Li, 0.1-5% of Mg, 0.1-3% of RE and the balance of Al. The added Mg element can separate out stable, fine and uniformly-distributed intermetallic compounds besides a micro-explosion effect, the activity of Li in the alloy can be reduced, the stability of the fuel can be improved, the added RE element can form an Al3 (Li, RE) precipitated phase with a core-shell structure by taking the precipitated intermetallic compound Al3RE as a heterogeneous nucleation particle of a metastable phase delta '(Al3Li), and the stability of the fuel can be improved. Through targeted component design, the structure regulation and control of the precipitated phase in the alloy powder can be realized, so that the microstructure of the precipitated phase is improved, and the combustion performance of the fuel is improved.

The invention relates to a ceramic product and a preparation method thereof, in particular to a preparation method of a carbon-ceramic brake disc with a composite friction layer and the carbon-ceramic brake disc, which are used for overcoming the defects that the production cost is increased and the large-scale application of the carbon-ceramic brake disc is restricted due to low material utilization rate in the manufacturing process of the carbon-ceramic brake disc. The preparation method of the carbon-ceramic brake disc with the composite friction layer sequentially comprises the following steps of preparation of the carbon-carbon composite material, rough machining, preparation of the heat conduction functional layer, preparation of the composite friction layer, ceramic treatment and finish machining. The heat conduction function layer can effectively reduce the temperature of the disc face in the braking process, the service life of calipers and other surrounding accessories is prolonged, the components of the composite friction layer are uniform and can be designed, and noise and shaking can be reduced in the braking process; in addition, the utilization rate of raw materials is improved and the production cost is reduced by using the residual stub bar. Meanwhile, the invention further discloses a carbon ceramic brake disc with the composite friction layer.

The invention provides an aluminum-vanadium-niobium-chromium intermediate alloy as well as a preparation method and application thereof. The aluminum-vanadium-niobium-chromium intermediate alloy comprises the following components in percentage by mass: 15%-22% of V, 1%-7% of Nb, 5%-11% of Cr and the balance of Al and inevitable impurities. The preparation method of the aluminum-vanadium-niobium-chromium intermediate alloy comprises the following steps: firstly, respectively preparing three binary intermediate alloys, namely primary alloys, by utilizing an aluminothermic reduction method; then, the primary alloy is refined through vacuum induction melting, and a secondary alloy is obtained; and finally, the secondary alloy and metal aluminum are subjected to vacuum induction melting, and the aluminum-vanadium-niobium-chromium intermediate alloy is prepared. The aluminum-vanadium-niobium-chromium intermediate alloy has the advantages of being uniform in component, low in element segregation and low in impurity content, and has very good application prospects and large-scale industrial popularization potential in the field of titanium alloy production through the additive manufacturing technology.

The invention relates to the technical field of metal materials, and discloses an Al-Zn heat-treatment-free aluminum alloy and a preparation method and application thereof. The Al-Zn series heat treatment-free aluminum alloy is prepared from the following components in percentage by mass: 8.0 percent to 18.0 percent of Zn, 4.0 percent to 9.0 percent of Si, 0.5 percent to 4.0 percent of Cu, 0.3 percent to 1.2 percent of Mn, 0.1 percent to 0.5 percent of Zr, 0.1 percent to 0.9 percent of V, 0.1 percent to 0.4 percent of Er, 0.05 percent to 0.6 percent of Sr, 1.0 percent to 3.0 percent of TiC / TiB2 and the balance of Al and inevitable impurities. The Al-Zn heat-treatment-free aluminum alloy provided by the invention is compact in structure, fine in crystal grain, uniform in solute element distribution and excellent in mechanical property, and can meet the application requirements of the fields of automobiles and spaceflight on aluminum alloy materials.

The invention relates to the technical field of medical instruments, and discloses a self-heating orthopedic nursing bag which comprises a sleeve, elastic wedge blocks are slidably clamped to the inner walls of the left side and the right side of the sleeve in the peripheral direction, heating rings are rotatably connected to the inner walls of the left side and the right side of the sleeve, and curved barrels are fixedly connected to the outer sides of the heating rings. The outer wall of the heating ring is provided with a one-way liquid suction pipe communicated with the curved barrel, and the one-way liquid suction pipe extends into the heating ring. According to the nursing device, active liquid medicine spraying can be conducted, scalding caused by steam passive fumigation is avoided, the liquid medicine spraying direction is intermittently changed along with intermittent rotation of the heating ring, so that comprehensive nursing is guaranteed, meanwhile, the heating ring intermittently deflects and shakes the liquid medicine, a turbine stirs the liquid medicine in the heating ring, all components of the liquid medicine are always uniform, and the nursing effect is good. And during the period, the sponge roller carries out comprehensive vibration contact physical therapy with proper pressure on the diseased limb, so that muscles are relaxed, and absorption of the medicine effect is facilitated.

The invention discloses a mineral casting prepared based on modified epoxy resin. Diacid is used for modifying epoxy resin to enhance the temperature resistance of the epoxy resin. The compressive strength of the mineral casting and the bonding strength between the epoxy resin and the aggregate are enhanced in a manner of combining the curing agent and post-curing treatment; by adding the dispersed nano silicon dioxide into the epoxy resin, the damping ratio of the mineral casting is effectively improved, and the shock absorption performance of the mineral casting is enhanced.

The invention relates to an amorphous film and a preparation method and application thereof.The amorphous film is an AlSiC amorphous film and is composed of Al, Si and C. The preparation method of the amorphous film comprises the following steps that a target material is provided, the amorphous film is deposited on a base body through a magnetron sputtering method, and the amorphous film can be used as a surface protection material. The AlSiC amorphous film is formed by disorderly arranging three kinds of atoms of Al, Si and C, so that the AlSiC amorphous film has high strength, high hardness and high toughness, toughness integration of the amorphous film is achieved, and therefore when the AlSiC amorphous film serves as a surface protection material, the protection effect is good, and the service life is longer. Meanwhile, the AlSiC amorphous film is prepared through a magnetron sputtering method, the deposition rate is stable, and the AlSiC amorphous film obtained through deposition is uniform in component, compact in structure, few in defect, good in combination with a base body and high in adhesive force.

The invention discloses a high-temperature-resistant composite coating and a preparation method thereof.According to the high-temperature-resistant composite coating, a first high-temperature-resistant coating is prepared on the surface of a base material through a plasma spraying method, and the first high-temperature-resistant coating is a composite coating composed of Al / Al2O3 with excellent high-temperature resistance; on the basis, a high-entropy alloy is introduced to serve as a second high-temperature-resistant coating, the high-temperature-resistant coating takes an aluminum element as a core element and can form good metallurgical bonding with the first high-temperature-resistant coating, and the second high-temperature-resistant coating is prepared through a laser cladding method, so that the bonding property with the first high-temperature-resistant coating is further enhanced. The high-entropy high-temperature alloy is used as the outermost coating, the porosity is low, the components are uniform, and certain mechanical properties are achieved while high temperature resistance is achieved. According to the composite coating disclosed by the invention, special powder components and a preparation process are adopted, so that the coating is difficult to deform or peel off in a long-time high-temperature environment, a base material is effectively protected, and the service life of the base material is prolonged.

The invention relates to the technical field of sampling detection, in particular to a reaction kettle full-automatic hanging bottle type online sampling device which is provided with a sampling hanging bottle, a sampling box, a pre-sampling unit, an information monitoring unit, an online analysis unit and a sampling execution unit. The information monitoring unit is used for acquiring the stress value of the sampling hanging bottle in the sinking process of the reactant, a real-time stress value curve is drawn, and the online analysis unit is used for judging whether the reactant has a local enrichment phenomenon or not and determining the sampling position of the sampling hanging bottle for sampling. The lifting motor is controlled by the sampling execution unit to drive the sampling hanging bottle to sink to the sampling position for sampling, and the standing time of the sampling hanging bottle at the sampling position is adjusted, so that the sampling position of closed sampling is adaptively adjusted according to the component distribution state of reactants in the reaction kettle, and the sample data representativeness of sampling detection is improved.

The invention discloses Ag-free high-temperature active alloy brazing filler metal and a preparation method and application thereof. The brazing filler metal alloy comprises 9.5-12.5 wt% of Ge, 9-11 wt% of Ti, 0.1-1.5 wt% of Ni and the balance Cu, the melting point of the brazing filler metal alloy ranges from 960 DEG C to 975 DEG C, and the recommended brazing temperature ranges from 1000 DEG C to 1100 DEG C. The product forms comprise foil strips, wires and powder paste. The preparation method comprises the steps of vacuum alloying, spherical gas atomization powder preparation, centrifugal ball milling powder mixing, spark plasma sintering, homogenizing heat treatment, isothermal rolling, isothermal rotary swaging and precise drawing. The alloy brazing filler metal is suitable for ceramic high-temperature direct packaging, diamond material device high-temperature brazing, refractory metal vacuum brazing and the like, high-strength weld joints can be obtained, the service temperature is high, the cost is low, and the problem that Ag element steam pollutes devices can be effectively solved.

The invention belongs to the technical field of alloys, and particularly relates to a rolled-state tough titanium alloy and a preparation method thereof.The rolled-state tough titanium alloy is obtained by smelting sponge titanium, aluminum particles and a titanium-molybdenum intermediate alloy, then heating the smelted sponge titanium, aluminum particles and the titanium-molybdenum intermediate alloy and then adopting a hot rolling mode. The rolled-state tough titanium alloy obtained through the method is fine in grain and uniform in structure, all components are evenly distributed, the technical defects of as-cast-state Ti-6Al-xMo alloy are overcome, and the mechanical property is effectively improved.

The invention discloses a micro-arc oxidation coating on the surface of a magnesium / aluminum or magnesium / aluminum alloy composite material as well as a preparation method and application of the micro-arc oxidation coating. Belongs to the technical field of metal surface micro-arc oxidation corrosion prevention, and is a micro-arc oxidation coating formed by carrying out low-voltage passivation and high-voltage growth multi-step micro-arc oxidation treatment on the surface of a magnesium / aluminum or magnesium / aluminum alloy composite material. According to the method, the passivation layer which is relatively thin but relatively compact is prepared at low voltage, so that the metal surface activity is reduced, and the oxide film layer is prevented from being ablated and broken under subsequent high-voltage treatment; according to different response conditions of different metals to the same voltage and the growth characteristics of the micro-arc oxidation coating, the coatings on different metal sides can grow to 100 microns in a low-voltage and high-voltage combined treatment mode. The problems that the damaged part of the magnesium alloy is repaired by using aluminum and an alloy thereof, galvanic corrosion occurs in a magnesium / aluminum composite board and a magnesium / aluminum composite component in the service process, the properties of a low-voltage film layer of a composite metal material are uneven, and a high-voltage film layer is ablated and damaged are solved.

The invention discloses a method for preparing a TiAl alloy cast ingot through vacuum induction melting, and belongs to the field of titanium-aluminum alloy smelting, metal is subjected to induction melting, the alloy cast ingot is subjected to overturning melting, in the power reduction process, the temperature of molten metal is reduced to 10 DEG C below the melting point, heat preservation is carried out for 30 min, electromagnetic stirring of a melt can last for a longer time, and the temperature of the molten metal is reduced to 10 DEG C below the melting point; therefore, the uniformity of metal components is improved. Then slowly cooling a stirring magnetic field of the alloy melt to 10 DEG C above the alpha phase transformation point at the speed of 10 kW / min, preserving heat for 30 min, performing single-phase region heat preservation heat treatment at 10 DEG C above the alpha phase transformation point without causing rapid growth of alpha crystal grains, performing furnace cooling to obtain a fine fully lamellar structure with relatively good room-temperature comprehensive mechanical property and more uniform components, and then reducing the power to the minimum at the speed of 80 kW / min, so as to obtain the high-strength alloy. And finally, the macrosegregation of the cast ingot is reduced.

The utility model provides an automatic pouring device for producing ladle castable, which relates to the technical field of ladle pouring and comprises pouring equipment and a pouring mould, one side of the pouring equipment is rotatably connected with a bearing plate, an outer fixed barrel is fixed at the top of the bearing plate, a discharge nozzle is fixed on the peripheral surface of the outer fixed barrel, and the inner wall of the outer fixed barrel is rotatably connected with an inner rotating barrel. A mode of installing an inner rotating barrel is adopted to solve a series of problems that the performance of a plurality of materials can be changed at a high temperature in the pre-pouring stage, the materials which can keep the characteristics of the materials and can be effectively stirred are difficult to find, the uniformity of the pouring materials is insufficient, and a series of problems can be caused as firstly, the non-uniform pouring materials can influence the flowability of the pouring materials; the problems of incomplete filling, excessive bubbles and the like occur in the pouring process due to the fact that the existing pouring materials are not uniform, the performance and the service life of products are directly affected by insufficient strength after pouring forming due to uneven pouring materials, and finally, if the yield is reduced, the production cost is increased, the production efficiency is reduced, and even the market competitiveness of enterprises is affected.

The invention discloses a method and a device for producing high-oxygen-content titanium sponge, and the method and the device are characterized in that a vanadium oxychloride solution is added into a refined titanium tetrachloride storage tank filled with the refined titanium tetrachloride solution, the vanadium oxychloride solution is used as a reducing agent and is added into a reduction reactor for reaction, and a titanium sponge target product is obtained. According to the method disclosed by the invention, titanium oxychloride can be subjected to decomposition reaction under a high-temperature condition to generate titanium tetrachloride and titanium oxide, and titanium oxychloride has unique properties in the aspects of structure, chemical reactivity, solubility and the like and has relatively good solubility in titanium tetrachloride; according to the method, the titanium oxychloride solution is selected as an oxygen producer to be mixed into the titanium tetrachloride solution, titanium oxide generated by decomposition is uniformly distributed in the sponge titanium, the oxygen element component in the sponge titanium raw material is uniform from the source, and the high-oxygen-content sponge titanium product with the uniform oxygen element component is finally produced; and the quality of raw materials for titanium ingot and titanium alloy smelting is stable and controllable.

The invention relates to the technical field of potato water culture, and discloses a nutrient solution culture device and a circulating culture method for purple potato water culture. In the plant water culture process, the lifting mechanism can adjust the inclination angle between the liquid collecting boxes and the culture frame so as to drive the liquid level in the liquid collecting boxes to vibrate, water culture liquid in the liquid collecting boxes is mixed to a certain degree through vibration, it is guaranteed that components of the water culture liquid in all parts in each liquid collecting box are uniform, and the water culture efficiency is improved. A good hydroponic environment can be provided for plants, growth of the plants is promoted, hydroponic liquid on the bottom layer is conveyed into the waste liquid treatment mechanism through the waste liquid recycling mechanism to be treated and discharged, and the hydroponic liquid is supplied to each liquid collecting box again through the culture liquid conveying mechanism in a timed and quantitative mode; the hydroponic solution losing nutritional ingredients can be replaced in time, different types of hydroponic solutions can also be replaced to deal with different growth processes of plants, and the hydroponic effect of the plants can be effectively guaranteed.

The invention discloses a preparation method of an ultra-pure nickel-titanium alloy thin-wall pipe for a heart valve. The method comprises the following steps: 1, preparing materials, and carrying out magnetic suspension induction melting to obtain a cast ingot; 2, gradually performing hot forging and rolling on the cast ingot to obtain a round bar; thirdly, the round bar is manufactured into a pipe blank, honing and polishing are conducted, and the nickel-titanium pipe is obtained; 4, assembling the nickel-titanium pipe into the titanium pipe to obtain a combined pipe; 5, heat treatment of the combined pipe; 6, three-roller precise cold rolling; 7, repeating to obtain a pipe semi-finished product; and 8, straightening and cylindrical grinding are performed to remove the titanium pipe. According to the method, the high-purity nickel-titanium alloy cast ingot is prepared through magnetic suspension induction melting, the outer-layer titanium pipe and the inner-layer nickel-titanium pipe are introduced to be assembled, the pass deformation is increased through the restraining and protecting effects of the titanium pipes, the number of times of rolling and heat treatment is reduced, and the machining period is shortened; the obtained ultra-pure nickel-titanium alloy thin-wall pipe is high in purity, high in size precision, good in surface quality, high in wall thickness uniformity and good in comprehensive mechanical property and is suitable for the field of heart valves.

The invention provides a red light perovskite material based on bromine-iodine mixed halogen and a preparation method thereof, the red light perovskite material comprises a perovskite material doped with metal elements, the structural formula of the perovskite material is CsPbIxBr3-x, and X is more than 0 and less than 3; the doped metal element is one or more of zinc, potassium, aluminum, magnesium, calcium, strontium, barium, sodium, rubidium, lithium, cerium, samarium, antimony, erbium and bismuth; wherein the atomic percent of the cesium element is smaller than or equal to 21%, and the atomic percent of the doped metal element is larger than or equal to 10%; the red-light perovskite material only has one light-emitting peak, and the light-emitting spectrum does not move or deform under the irradiation of blue light. The prepared perovskite material is uniform in component and free of ion migration.

The invention provides a brexpiprazole tablet and a preparation method thereof, and belongs to the technical field of medicines. According to the preparation method disclosed by the invention, firstly, the brexpiprazole raw material medicine and the excipient are pretreated, then premixed, and then mixed with other components for total mixing, tabletting and coating, all the components are mixed more uniformly, and meanwhile, the variety of the filler is controlled, so that the brexpiprazole tablet is relatively low in friability, high in dissolution speed of a finished product and short in disintegration time.

The invention relates to the technical field of bacterial cellulose preparation, in particular to a composite flora for producing bacterial cellulose and a preparation method thereof, and the preparation method comprises the following steps: screening gluconobacter oxydans, obtaining culture medium preparation materials and preparation tools, preparing a slant culture medium set, preparing an enriched liquid culture medium set, and preparing composite flora mixed inoculation liquid. The method comprises the following steps: preparing a waste tobacco leaf leaching solution, extracting a proportional leaching solution from the waste tobacco leaf leaching solution according to a preset proportion, obtaining a mixed fermentation culture medium based on a preparation tool and the proportional leaching solution, and carrying out inoculation operation on a composite flora mixed inoculation solution by using the mixed fermentation culture medium to obtain a dry cellulose membrane; calculating the yield of the bacterial cellulose based on the dry cellulose membrane, and completing the preparation of the composite flora for producing the bacterial cellulose based on the yield of the bacterial cellulose. The method can be used for scientifically, efficiently and stably preparing the composite flora.

The invention discloses ZnO-based voltage-sensitive semiconductor ceramic as well as a preparation method and application thereof, and belongs to the technical field of semiconductor ceramic. The ZnO-based voltage-sensitive semiconductor ceramic provided by the invention is prepared from the following components: ZnO, Bi2O3, MnO2, Co3O4, Cr2O3, Sb2O3, Al (NO3) 3, a disulfide bond organic silicon cross-linking agent, a photothermal conversion agent, a photoinitiator, a dispersing agent and a solvent I. The ZnO-based voltage-sensitive semiconductor ceramic has the characteristics of continuous thickness and uniform components, the voltage gradient and the nonlinear coefficient of the ZnO-based voltage-sensitive semiconductor ceramic are superior to those of a traditional product, the parameter drift rate after surge impact is small, and the ZnO-based voltage-sensitive semiconductor ceramic can be applied to high-end application scenes such as vehicle-mounted chargers of new energy automobiles.

The invention belongs to the technical field of antibacterial fabrics, and particularly relates to a high-breathability antibacterial fabric preparation device and process, the high-breathability antibacterial fabric preparation device comprises two side locking housings, a sliding groove is formed in the middle of the surface of one side of each side locking housing, rollers are slidably connected in the sliding grooves, one end of each roller is movably connected with a supporting cylindrical plate, and the other end of each roller is movably connected with a pressing plate; the two sides of the supporting barrel-shaped plate are fixedly provided with pressurizing plates, grooves are formed in the middle portions of the lower surfaces of the pressurizing plates, the roller coating in the padding pool can not only press and guide the fabric, but also stir the antibacterial agent in the padding pool under rotation, and when the roller coating presses the fabric, the antibacterial agent in the padding pool can be stirred, so that the antibacterial effect is improved. The antibacterial finishing agent and other coating materials can better permeate into fiber gaps of the fabric, the antibacterial agent is in full contact with the fibers under the compression effect, the adhesion rate of the antibacterial agent on the fabric is increased, it is like that tiny particles are squeezed into the gaps between the fibers, the particles are more firmly attached to the fabric, and therefore the durability of the finishing effect is improved.

The invention discloses an indium-silver alloy and a preparation method and application thereof, and relates to the technical field of precious metal material manufacturing. The preparation method of the indium-silver alloy comprises the following steps: S1. heating and melting raw materials indium and raw materials silver respectively to obtain molten indium and molten silver; S2. pouring the molten silver obtained in step S1 into the molten indium obtained in step S1 and uniformly mixing them into an alloy melt; S3. cooling and solidifying the alloy melt obtained in step S2; S4. heating and melting the solidified alloy obtained in step S3 under a vacuum environment and keeping the temperature to obtain an alloy melt again, and cooling to obtain an indium-silver alloy. The present invention does not require heating all raw materials to a high temperature to uniformly disperse silver in an indium matrix, thereby reducing material loss caused by volatilization and oxidation. By repeatedly melting the alloy in a vacuum at a relatively low temperature, on the one hand, gas inclusions in the alloy are reduced and the alloy composition is made uniform, and on the other hand, the volatilization of indium in the degassing process is reduced.

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

The application provides a method for microwave-assisted preparation of tetragonal barium titanate powder, comprising the following steps: mixing a barium source and a titanium source to obtain a non-hydrolytic sol; performing a microwave-assisted gelation reaction on the non-hydrolytic sol to obtain a wet gel; drying the wet gel to obtain a dry gel; performing heat treatment on the dry gel in a protective atmosphere to obtain a pre-sintered powder; performing microwave-assisted calcination on the pre-sintered powder to obtain a calcined powder; and performing washing and drying on the calcined powder to obtain the barium titanate powder. The method provided by the application performs a microwave-assisted gelation reaction on a sol, and through the microwave effect in the two steps of gelation and calcination, the gelation time can be shortened and the calcination temperature can be reduced, and the synergistic regulation of high purity, ultra-fine particle size and high tetragonal phase content of the barium titanate powder is realized simultaneously. The method provided by the application is simple and controllable, low in energy consumption, suitable for industrial large-scale production, and the prepared barium titanate powder can be widely applied to the preparation of ceramic capacitors, and the reliability and miniaturization capability of the device are significantly improved.