23results about How to "Uniform tissue structure" patented technology

The invention discloses an integrated preparation method of a large-thickness high-density electrical insulation-corrosion-resistant ceramic coating on the surface of a heat dissipation substrate for a high-power device, and relates to the technical field of surface treatment of aluminum alloys and composite materials thereof. The method comprises the following steps: placing a pretreated substrate as an anode and a stainless steel plate as a cathode in a basic arc suppression type electrolyte, and performing low-temperature soft plasma electrolytic oxidation on the surface of the pretreated substrate by using an asymmetric bipolar pulse micro-arc oxidation technology to grow a large-thickness high-density ceramic layer in situ; specifically, low-temperature soft spark discharge is induced by inserting additional negative pulse voltage, the plasma temperature and energy are stabilized, spark discharge is uniform, and the density is increased by an order of magnitude, so that continuous bombardment with no damage to the surface flatness as the plasma intensity upper limit is carried out on a passive film on the surface of a substrate; and the defects such as pores and cracks are continuously healed and repaired, and the densification of the coating is promoted, so that the aluminum oxide coating with large thickness, high density, high electrical insulation and corrosion resistance is obtained.

The invention discloses yttrium oxide-aluminum oxide transition layer composite ceramic and a preparation method and application thereof.The preparation method comprises the steps that quantitative aluminum oxide powder, transition mixed powder and yttrium oxide powder are sequentially laid in a forming mold of a cold isostatic pressing machine from bottom to top, and then the powder raw materials in the forming mold are evenly pressurized through the cold isostatic pressing technology; a formed ceramic green body is obtained; the formed ceramic green body is machined into a designed shape and then sintered, the composite ceramic with the aluminum oxide part as an aluminum oxide base material, the transition mixed powder as a transition layer and the yttrium oxide part as a coating is obtained, the transition layer can reduce a gap of a bonding interface of yttrium oxide and aluminum oxide, and the interface is seamlessly connected and is more compact; in addition, aluminum oxide particles and yttrium oxide powder particles in the transition layer are uniformly mixed and embedded with each other, so that the mechanical locking between materials is obviously improved, and the binding force is stronger; the problems that in the prior art, an yttrium oxide etching-resistant protective coating is poor in binding force and prone to peeling off are solved.

The invention relates to the technical field of aluminum alloy materials, in particular to a rare earth microalloyed aluminum alloy cast rod and a production process thereof, and the aluminum alloy cast rod comprises the following chemical components in percentage by mass: 8.0%-9.0% of Zn, 2.2%-2.8% of Cu, 1.8%-2.5% of Mg, 0.005%-0.01% of Ti, 0.005%-0.01% of Si, 0.005%-0.01% of Mn, 0.005%-0.01% of Fe, 0.01%-0.05% of Cr, 0.01%-0.05% of Cl, 0.05%-0.4% of rare earth elements and the balance of Al and inevitable impurities. The rare earth elements are La, Ce and Nd. Rare earth elements in a certain proportion are added into the chemical components, so that the proportion of the alloy components is optimized, and the mechanical property of the aluminum alloy cast rod is improved.

The invention discloses yttrium oxide-aluminum oxide composite ceramic with high bonding strength and a preparation method and application thereof.The preparation method comprises the steps that aluminum oxide granulation powder and yttrium oxide granulation powder are sequentially added into a forming mold and are vibrated and compacted, and then the forming mold filled with materials is put into a cold isostatic press; uniformly pressurizing the powder raw material in the forming die by adopting a cold isostatic pressing process, compressing the volume of the powder raw material, and discharging air holes to obtain a formed ceramic green body with a uniform organization structure and high density; the formed ceramic green body is machined into an yttrium oxide-aluminum oxide composite ceramic green body in a designed shape, then the yttrium oxide-aluminum oxide composite ceramic green body is transferred into a high-temperature sintering furnace to be sintered, the strength is further improved, and the integrally-sintered high-bonding-strength yttrium oxide-aluminum oxide composite ceramic is prepared; the problems that in the prior art, an yttrium oxide anti-etching protective coating is poor in binding force and prone to peeling off are solved, and meanwhile the protection function on an aluminum oxide base material is enhanced.

The invention discloses a high-entropy alloy structured composite negative electrode material and a preparation method thereof and a lithium metal battery, and belongs to the technical field of lithium batteries, the high-entropy alloy structured composite negative electrode material comprises lithium, non-metallic elements and other metallic elements, the ratio of lithium atoms to total atoms in the composite negative electrode material is 40-80 at%, and the ratio of non-metallic elements to total atoms in the composite negative electrode material is 1-10 at%. The ratio of atoms corresponding to the non-metallic elements to the total atoms is 1-20 at%, the balance is other metallic elements, the atomic ratio of the other metallic elements is equal, the metal lithium and compounds or simple substances of the other metallic elements are smelted to obtain high-entropy alloy liquid, the high-entropy alloy liquid is subjected to heat preservation and poured into a mold, the high-entropy alloy sheet is obtained after cooling, and the composite negative electrode material contains various eutectic phases, the internal composition segregation is weakened, the organization structure is more uniform, the distortion degree and dislocation accumulation of the alloy in the deformation process are reduced, then the effect of improving the ductility is achieved, and the commercial application of the lithium alloy negative electrode is improved.

The invention relates to the technical field of textile machinery, and discloses a textile thread positioning device for textile production and processing, which comprises a bottom plate, a mounting frame fixedly connected to the top of the bottom plate, a mounting disc fixedly connected to the top of the mounting frame, and guide wheels rotationally connected to two sides of the inner wall of the mounting disc through rotating shafts, and further comprises an absorption assembly, comprising a side plate fixedly connected with the right side of a dispersion box, a buffer pipe is fixedly connected to the surface of the side plate, a vibration pipe is fixedly connected to the bottom of the inner wall of the buffer pipe, and a buffer tank is fixedly connected to the end, away from the inner wall of the buffer pipe, of the vibration pipe. By arranging the absorption assembly, when the interior of the buffer tank is compressed, gas is exhausted outwards, and airflow is sprayed outwards through the absorption holes in the surface of the contact clamp and blown to the multiple strands of spinning threads in the dispersion box, the airflow can separate the multiple strands of wound spinning threads, and the spinning threads are prevented from being wound or misplaced; and the organization structure of the textile fabric can be more uniform and compact.

The invention discloses a stainless steel roller efficient accurate grinding ceramic grinding wheel and a preparation method thereof, and the stainless steel roller efficient accurate grinding ceramic grinding wheel comprises the following components in parts by weight: 100 parts of grinding material; 10-25 parts of a ceramic bonding agent; 5-20 parts of a pore forming agent; 3-6 parts of a resin binder; wherein the grinding material is a large-particle silicon carbide micro powder accumulation body prepared by adopting a ceramic bonding agent, has the characteristics of a micro grinding tool, and has three elements of the grinding material, the bonding agent and air holes, and the resin bonding agent is a mixture of low-viscosity phenolic resin liquid and alcohol in a ratio of 1: 1 or 1: 2. The grinding material provided by the invention has structural uniformity, micro-cutting-edge cutting performance, micro-crushing performance of micro-grains falling off along grain boundaries and good self-sharpening performance, a ceramic grinding wheel prepared from the grinding material has the advantages of more uniform organization structure, high strength, good shape retentivity and the like, and the grinding efficiency is greatly improved under the condition that the grinding precision is ensured. And the grinding efficiency is high, the single feed amount is large, the finishing interval is short, and the service life is long.

The invention discloses high-purity isostatic graphite and a preparation process thereof, and relates to the technical field of graphite, and the high-purity isostatic graphite is prepared from the following components: modified asphalt, petroleum coke, graphite powder, polyvinyl alcohol and water; the modified asphalt is formed by performing intercalation modification on Esox70 # matrix asphalt; the prepared isostatic pressing graphite can be made into product materials with large specifications, and the application requirements of large-scale equipment can be met. According to the preparation method, the raw material components are adjusted, the modified asphalt is introduced, and the specific preparation method is matched, so that the isostatic pressing graphite with a more uniform organization structure can be obtained, and the overall performance of the isostatic pressing graphite is greatly improved.

The invention discloses a curved surface flattening device for a stainless steel band, and belongs to the technical field of stainless steel band production.The curved surface flattening device for the stainless steel band comprises a main body, a conveying groove is formed in the top of the main body, a plurality of conveying rollers are rotationally connected into the conveying groove, and feeding and discharging ports are formed in the two sides of a processing cabinet; a driving mechanism is installed in the processing cabinet, a connecting rod mechanism is installed in the conveying groove, and a transmission mechanism is installed in the conveying groove. By designing the driving mechanism, the connecting rod mechanism and the transmission mechanism, adjustment can be conducted according to the specification of the stainless steel band when the stainless steel band conducts curved surface flattening machining, meanwhile, flattening adjustment is conducted twice before the stainless steel band enters the device and after the stainless steel band is machined, and adjustment of the curved surface of the stainless steel band is more complete. And the stainless steel bands with different thicknesses can be changed according to different curvatures of the stainless steel bands during leveling adjustment, so that the working performance of the curved surface leveling device is greatly improved.

The invention discloses a zinc oxide-based sputtering target material as well as a preparation method and application thereof, and belongs to the technical field of zinc oxide-based sputtering target materials. The preparation method comprises the following steps: smelting a magnesium ingot and a zinc ingot to obtain an alloy ingot; preparing the alloy ingot into magnesium oxide-doped zinc oxide powder by adopting a plasma gasification oxidation mode, and then preparing slurry from the zinc oxide powder, gallium oxide and rare earth oxide; and carrying out drying, compression molding, cold isostatic pressing and sintering on the slurry. Through smelting, sufficient solid solution of magnesium in zinc can be promoted, and the magnesium oxide doped zinc oxide powder with high solid solubility can be obtained. The doped magnesium oxide can regulate and control the forbidden bandwidth of zinc oxide, and better photoelectric properties of the film are obtained. By doping gallium oxide and rare earth oxide, n-type doping can be realized, weakly bound free electrons are introduced, the carrier mobility of zinc oxide is improved, and the resistivity of the material is reduced. The prepared zinc oxide-based target material is high in density, fine in crystal grain and uniform in organization structure, and the TCO thin film with excellent performance can be prepared easily.

The invention discloses a method for manufacturing a silver alloy tube target. The manufacturing method is specifically as follows: first, 90 parts of silver ingots and 10 parts of low-melting-point pure metal ingots are placed in an induction melting furnace for primary melting to obtain a silver alloy ingot A; wherein the low-melting-point pure metal ingot is an indium ingot, a tin ingot or a gallium ingot; then, the silver ingot and the silver alloy ingot A are weighed according to a mass ratio of (9-20):1, and placed in an induction melting furnace for secondary melting to obtain a silver alloy ingot B; the silver alloy ingot B is trimmed and hot-forged into a cylindrical ingot blank of a certain size; then, the cylindrical ingot blank is subjected to oblique rolling and perforation operations to obtain a silver alloy rough tube; then, the silver alloy rough tube is subjected to fine rolling, shaping, annealing and straightening operations to obtain a silver alloy tube blank; finally, the silver alloy tube blank is subjected to grinding machine processing to obtain a silver alloy tube target. The process steps are simple and the production efficiency is high. The purity, relative density and grain size of the prepared silver alloy tube target material all meet the use requirements of AMOLED display.

The gradient hard alloy comprises a core layer and surface layers, the core layer is located between the two surface layers, each of the core layer and the surface layers comprises a hard phase and a high-entropy binding phase, and the hard phase comprises WC and a cubic phase compound; components of the high-entropy binding phase comprise at least five of first transition metal elements and second transition metal elements, the first transition metal elements comprise at least two of Co, Ni and Fe, the second transition metal elements comprise at least three of Re, Ru, Rh, Pd, Os, Ir and Pt, the mass content of the high-entropy binding phase on the surface layer is 1.0-2.0 times of the nominal mass content, the surface layer is free of cubic phase compounds, and the thickness of the cubic phase compounds is 0.5-1.5 mm. The gradient hard alloy has the advantages of being high in density, free of third phase precipitation and good in alloy performance.

The present invention belongs to the technical field of material preparation, and aims to solve the problem that the preparation process of the existing metal ceramic material is difficult to accurately control the distribution and grain size of each phase in the metal ceramic matrix, resulting in uneven microstructure of the material, thereby affecting the comprehensive performance of the material. To this end, the present invention provides a method for preparing a fiber-reinforced metal ceramic material, comprising: pre-treating silicon carbide fiber; mixing and grinding titanium metal powder and silicon carbide ceramic powder according to a predetermined ratio; then adding silicon carbide fiber particles and placing them in an ultrasonic mixer; adding a dispersant and a binder and mixing them again; the mixture is sequentially cold isostatically pressed and hot pressed; the obtained blank is sequentially pre-sintered, high-temperature sintered, cut and surface treated. The metal ceramic material prepared by the present invention is significantly improved in strength, toughness, hardness, high temperature resistance, wear resistance and corrosion resistance, can better meet the high performance requirements in the aviation field, and provide strong support for the aviation industry.

The application belongs to the technical field of precious metal sputtering target material, and discloses a preparation method of a nickel-platinum alloy target material for magnetron sputtering. The preparation method of the nickel-platinum alloy target material for magnetron sputtering comprises the following steps: (1) mixing nickel powder and platinum powder and ball milling; (2) hot-pressing sintering; (3) smelting; (4) rolling; and (5) performing shape processing after annealing to obtain the nickel-platinum alloy target material. The nickel-platinum alloy target material prepared by the method has uniform internal grain structure and high density, and the nickel-platinum alloy target material has high yield, fine grains and stable sputtering, which is beneficial to obtaining a high-quality thin film with uniform thickness.

The invention relates to the technical field of cutting tools, and provides an alumina-based ceramic cutting tool and a preparation method thereof.A salt solution of nickel nitrate and yttrium nitrate and Al2O3 are subjected to ball-milling mixing, yttrium ions and nickel ions can well coat the surface of Al2O3, and then the alumina-based ceramic cutting tool is obtained through decomposition of a salt solution mixture and H2 reduction of a decomposed product. According to the preparation method, Ni-Y2O3-Al2O3 composite powder uniformly coated with metal Ni and Y2O3 can be prepared, the composite powder can be directly mixed with TiC powder in a ball-milling manner, and the aluminum oxide-based ceramic cutting tool which is uniform in organization structure, large in relative density and good in hardness and fracture toughness is prepared.

This invention provides a method for preparing a CBN grinding wheel, comprising the following steps: melting the raw materials of a ceramic binder, quenching them in water, and then crushing them to obtain a ceramic binder; impregnating the CBN grinding wheel metal matrix in a CBN grinding wheel impregnation slurry, drying and curing it to obtain a CBN grinding wheel blank; sintering the CBN grinding wheel blank and then machining it to obtain the final product; the raw materials of the ceramic binder, by weight percentage, include 10-15% boric acid, 5-6% lithium carbonate, 30-49% silicon dioxide, 28-40% bismuth oxide, 2-3% calcium fluoride, 2-3% nickel oxide, 2-3% cobalt oxide, and 2-3% titanium oxide; the CBN grinding wheel impregnation slurry, by weight percentage, includes 40-45% CBN abrasive, 10-15% the ceramic binder, 33-36% ethanol, 8-10% alcohol-soluble phenolic resin, and 0.5-1% silane coupling agent.

This invention relates to a method for preparing high-performance, low-temperature-coefficient Sm-Co permanent magnet materials, belonging to the technical field of samarium-cobalt permanent magnet materials. It solves the problem in the prior art where the magnetic properties and temperature coefficient are difficult to balance due to the addition of heavy rare earth elements in 2:17 type samarium-cobalt magnets. The method includes: S1, preparing the alloy composition Sm according to a mass percentage... a Ho b Co c Fe d Cu e Zr f Where a, b, c, d, e, and f are the mass percentages of Sm, Ho, Co, Fe, Cu, and Zr, respectively, and satisfy the following conditions: 18≤a≤25, 1≤b≤5, 40≤c≤50, 19≤d≤24, 5≤e≤6, 2.5≤f≤3.5, and a+b+c+d+e+f=100; S2, induction melting and casting; S3, medium crushing; S4, sequentially pulverizing and sieving by fluidized bed jet milling, followed by ball milling under nitrogen protection; S5, magnetic field orientation and delayed pressure molding; S6, sintering, solution treatment, and aging treatment under micro-negative pressure. The magnet prepared by this invention has a room temperature remanence Br≥11kGs, and the absolute value of the remanence temperature coefficient |α|≤0.03% / ℃ in the range of 25~150℃, achieving a good balance between high remanence and low temperature coefficient, which can meet the long-term service requirements of precision instruments in a wide temperature range environment.

The invention discloses a high-purity TA8 titanium ingot material prepared from TA9-1 and Gr.17 and a preparation method of the high-purity TA8 titanium ingot material, and belongs to the technical field of rare metal material processing. On the premise that palladium powder is not used, the proportioning ratio of TA9-1 to Gr.17 to titanium sponge to TiO2 is calculated through a TA8 target component, the titanium sponge and the TiO2 are evenly mixed and pressed into an electrode block, the electrode block is evenly distributed with TA9-1 and Gr.17 block materials, and smelting is conducted; by pressing the two low-oxygen titanium-palladium alloy block materials into electrodes, the O content in the two low-oxygen titanium-palladium alloy block materials can be effectively increased to 0.12-0.20 wt.% from 0.05 wt.%, the Pd content is diluted to 0.04-0.08 wt.%, and finally the large-specification TA8 ingot material which can be industrialized and is high in purity and stable in quality is prepared. Two low-oxygen titanium-palladium alloy blocky materials which are difficult to directly recycle are turned into wealth, the problem of oxygenation of the blocky materials is solved, full utilization of precious metal resources is achieved, materials and energy are saved, the production cost is reduced, and environmental pollution is reduced; eB smelting is utilized to remove high-density and low-density inclusions, and the TA8 titanium ingot material with stable quality and high purity is produced.

The invention relates to a high-density forming blank-making platform and a using method thereof, and relates to the technical field of high-density aluminum alloy, the high-density forming blank-making platform comprises a workbench, the workbench is provided with a blank-making device, the blank-making device comprises a charging barrel, a fixing plate, a vibration plate and a vibration assembly, and the vibration assembly is used for driving the charging barrel to shake; the vibrating plate is located above the vibrating assembly and connected with the vibrating assembly, one side of the vibrating plate is rotationally connected with a rotating shaft along the horizontal axis, the rotating shaft is fixedly connected with the fixing plate, one end of the charging barrel is open, the end, away from the opening, of the charging barrel is detachably connected with the fixing plate, a coaxial worm gear is fixedly arranged on the rotating shaft, the worm gear is meshed with a worm, and the worm is rotationally connected with the vibrating plate. The method has the effects of reducing the cost, reducing the manufacturing defects and improving the mechanical performance.

The invention discloses a hard alloy and a preparation method and application thereof, the hard alloy comprises a hard phase and a binding phase, the hard phase is (W, Re) C, the binding phase comprises one or two of Ru and Os, Co and Re, the mass of the solid solution Re in the hard phase accounts for 50%-90% of the total Re mass in the hard alloy, and the atomic percent of the total Re / Co in the hard alloy is not larger than 25%. The preparation method comprises the following steps: taking M alloy powder, tungsten-rhenium alloy powder, WC powder and carbon powder as raw materials, carrying out pre-ball-milling and ball-milling, and carrying out drying granulation, molding and sintering on the mixture to obtain the hard alloy. The hard alloy has high hardness, high toughness and good high-temperature performance, is excellent in comprehensive mechanical property and can be well applied to preparation of hard alloy tools.

The lead belt production line for preparing the lead-acid storage battery polar plate comprises a lead melting pot, a heat preservation pot and a lead storage tank which are arranged in sequence, an inner cavity of the lead melting pot is communicated with an inner cavity of the heat preservation pot through a lead conveying pipe, an overflow opening in the heat preservation pot is in butt joint with an inner cavity of the lead storage tank, and cooling pipelines of the cooling system are evenly distributed on the outer wall of the lead storage tank. The method comprises the following steps: adding lead alloy into a lead melting pot for melting, conveying the molten lead into a heat preservation pot through a lead conveying pipe after the molten lead is molten, carrying out heat preservation for a period of time, conveying the molten lead into a lead storage tank, starting a cooling system to cool the molten lead and starting an ultrasonic device to carry out ultrasonic treatment on the molten lead in the lead storage tank when a lead blank is cast. And then carrying out a cast-rolling test on a horizontal type upper and lower double-roller cast-rolling machine. The method mainly solves the problems of developed dendritic crystals, non-uniform grain sizes and rough and irregular grain boundaries in the surface microstructure of the lead belt prepared by the existing cast rolling equipment, and can refine the grains and inhibit segregation of alloy components.

The invention discloses a metal material toughening treatment device and method.The metal material toughening treatment device comprises a heating furnace, a support, a turning cover plate, a turning assembly, a steering assembly, a circulating gas assembly and a heating unit.The bottom of the heating furnace is fixedly installed at the top of the support, and the turning cover plate is rotatably installed at the top of the heating furnace; the overturning assembly is fixedly installed at the top of the heating furnace, the steering assembly is fixedly installed at the bottom of the heating furnace, the circulating gas assembly is fixedly installed at the bottom of the heating furnace, the heating units are located in the heating furnace, the number of the heating units is multiple, and the multiple heating units are arranged in a stacked mode. Through rotation of the electric heating wire, the interior of the heating furnace is heated uniformly; the metal heating device has the function of locally heating metal, local high-temperature heating is conducted on the metal in the overall heating process, differentiation of different regional performance of the metal is achieved, and the purpose of comprehensively improving the metal performance is achieved.

The invention discloses a powder metallurgy piston and a preparation method thereof. The powder metallurgy piston comprises, by weight, 63.5%-89% of aluminum-silicon alloy powder, 1.5%-5% of electrolytic copper powder, 1.0%-3.5% of nickel powder, 0.6%-1.5% of magnesium powder, 0.05%-0.1% of zirconium powder, 0.05%-0.1% of vanadium powder, 0.1%-0.15% of titanium powder, 0.05%-0.11% of scandium powder, 0.05%-0.1% of chromium powder and the balance gas atomization aluminum powder. And the weight ratio of the aluminum-silicon alloy powder to the atomized aluminum powder is greater than or equal to 2.2. The powder metallurgy piston is made of aluminum alloy materials, has the advantages of being high in heat-resistant strength, excellent in welding performance, light in weight, good in abrasion resistance, low in thermal expansion coefficient, good in thermal conductivity and the like, and has important application prospects in the field of automobile engine piston materials.