65 results about "Gold alloy" patented technology

The invention discloses a transistor, a manufacturing method thereof and an electronic device, manufacturing materials of an electrode comprise titanium alloy and gold alloy, a conductive penetrating part penetrates through a barrier layer and is directly connected with two-dimensional electron gas in the electrode and a channel layer, direct contact between the electrode and the two-dimensional electron gas is achieved, and the reliability of the transistor is improved. When the contact between the electrode and the two-dimensional electron gas is ohmic contact, the contact resistance during ohmic contact can be reduced due to the existence of the conductive penetrating part, so that the electrical property of the transistor is improved.

The invention provides a method for continuously measuring gold, silver, copper, lead and zinc in gold-based alloy, and belongs to the technical field of gold alloy element content detection. According to the method, through combined use of a gravimetric method, an electrolytic method and a titration method, by taking chemical means such as extraction and back extraction, electrochemistry and complex reaction as a theoretical basis, the aim of continuously and accurately measuring gold, silver, copper, lead and zinc in the gold-based alloy can be achieved through one-time sample weighing and sample digestion, the efficiency is improved, the complexity of multiple times of treatment is reduced, and the method is suitable for large-scale popularization and application. The method is accurate and reliable. Different masking agents, buffer reagents, precipitants and the like are selected in a targeted manner to be used in one solution one by one, and the problems that an element method is not applicable, measurement is out of range, and elements interfere with one another are solved.

The invention relates to a high-antimony-arsenic-precious-lead treatment method, and belongs to the technical field of non-ferrous metal pyrometallurgy. The method comprises the following steps: carrying out vacuum fractionation on high-antimony-arsenic precious lead, and condensing from bottom to top through a graphite condensing disc for two-stage fractional condensation and a stainless steel condensing disc for fractional condensation at the topmost end in sequence from bottom to top to obtain a lead-antimony alloy, crude antimony and crude arsenic as well as a residual high-antimony-copper-silver-gold alloy; the high-antimony copper-silver-gold alloy is subjected to oxidation blowing, and the copper-silver-gold alloy, oxidizing slag and smoke dust are obtained; and carrying out vacuum distillation on the copper-silver-gold alloy to obtain crude copper and crude silver. The method can be used for treating high-antimony and high-arsenic coexisting noble lead materials, realizes open-circuit (recovery in the form of simple substances) of arsenic and antimony, shortens the smelting period of the noble lead, reduces oxidation blowing, reduces the recovery cost of noble metals, greatly reduces the environmental protection pressure, and has the characteristics of low energy consumption, simplicity in operation, high direct recovery rate of metals, high total recovery rate of metals and the like.

The invention discloses a 18K gold luster imitation gold alloy suitable for the sculpture field and a preparation method thereof, the 18K gold luster imitation gold alloy comprises the following basic components in percentage by weight: 20-22% of zinc, 10-20% of copper, 10-20% of zinc, 10-20% of copper, 10-20% of copper and 10-20% of zinc. 3%-4% of aluminum; 2%-3% of silicon; 0.9% to 1.9% of nickel; 0.1% of rare earth, and the balance copper and inevitable impurities. The method has the beneficial effects that one-time forming can be directly carried out through conventional copper art sculpture machining modes such as casting and forging, follow-up complicated procedures such as gilding and gilding are not needed, the sculpture production period is greatly shortened, the manual operation difficulty is reduced, and the 18K gold appearance is accurately matched.

A gold alloy and a manufacturing method thereof, the gold alloy including: gold; and an Au-X-RE metamaterial dispersed in a gold matrix, the Au-X-RE metamaterial being represented by a composition formula Au 100‑(a+b) X a RE b represents, in the composition formula, X represents at least one atom selected from the group consisting of Al, Ga, In, Si, Ge, and Sn, RE represents a rare earth element, a and b are contents of X and RE, respectively, represented by at%, satisfy the following (1) and (2), 10 ≤ a ≤ 40 (1) 13 ≤ b ≤ 17 (2).

The present application relates to copper anode slime comprehensive treatment technical field, especially in kind of copper anode slime's purification treatment process. Including the following steps: copper anode slime's pretreatment;Metal gel capture agent's preparation;Vacuum inductive desulfurization of copper arsenic tellurium anode slime is removed;The noble metal of desulfurized anode mud silicon is captured.The present application can increase the mutual contact of silicon dioxide, sodium carbonate, bismuth oxide and carbon fiber and metal elements in desulfurized anode gold mud in three-dimensional space by preparing metal gel capture agent, thereby increasing the contact area, strengthening the slagging reaction of silicon dioxide and sodium carbonate with impurity elements such as arsenic and antimony, and further enhancing the ability of carbon element to reduce bismuth oxide, so that bismuth can better capture gold and silver elements, and impurity metals can better aggregate in the slag, and the obtained bismuth-silver-gold alloy particles have high purity and good metal purification effect.

The embodiment of the invention provides a silver-gold alloy bump structure and a forming method thereof. The method comprises the following steps: providing a semiconductor device; sequentially forming a first seed layer and a second seed layer on the functional surface of the semiconductor device, wherein the second seed layer is an Au seed layer; forming a silver-gold alloy bump on the second seed layer; carrying out annealing treatment on the silver-gold alloy bump and the second seed layer; and removing a part of the first seed layer and a part of the second seed layer through an etching process, so that the first seed layer and the second seed layer are only located between the silver-gold alloy bump and the semiconductor device. Before the seed layer is etched, the silver-gold alloy bump and the Au seed layer are subjected to annealing treatment, so that the hardness of the silver-gold alloy bump is ensured, the lattice structure of Au in the Au seed layer is changed through annealing treatment, the etching rate and effect are improved, the problem of gold residue is solved, and the electrical property and reliability of the silver-gold bump structure are improved.

The application relates to a method for improving the density of a platinum-based powder metallurgy alloy, which realizes the purpose of reducing the porosity of a precious metal powder metallurgy alloy ingot and improving the material density through vacuum melting, powder preparation, resonance compaction, liquid phase sintering, controlled forging and other processes. The above process is adopted, the high-temperature endurance strength and toughness of the platinum-based powder metallurgy alloy are greatly improved, the high-temperature service life of the product is significantly enhanced, and good economic benefits are brought.

The present application discloses a high-strength and high-conductivity Al‑Si‑Mg‑Zr‑Er aluminum alloy and a preparation method thereof. The method comprises the following steps: selecting aluminum ingots, magnesium ingots, Al‑20Si alloys, Al‑10Zr alloys, and Al‑10Er alloys as raw materials for smelting to form aluminum alloy melt; refining the aluminum alloy melt with a refining agent to perform impurity removal treatment in a furnace; casting the aluminum alloy melt to form an ingot plate, and further treating the ingot plate by a composite method of rolling and heat treatment. The method of the present invention can optimize the composition of aluminum alloy thermal conductive materials and prepare an aluminum alloy with excellent comprehensive mechanical properties and electrical conductivity.

The invention belongs to the technical field of welding material design and optimization, and discloses a nickel-based alloy welding rod for a low-temperature service environment and a component design method of the nickel-based alloy welding rod. The welding rod comprises a pure nickel core wire and a coating with a specific formula, the coating comprises CaCO3, CaF2, Cr, Mo, Mn, Si-Fe alloy, Mo-Fe alloy, Nb-Fe alloy and other components, and the mass ratio Cr / Nb of chromium to niobium in deposited metal is controlled to range from 9.16 to 11.68. The invention further provides a corresponding component design method, Cr / Nb is identified as key parameters by constructing a BP neural network model and establishing a mapping relation between chemical components and mechanical properties, and the optimal range of Cr / Nb is reversely deduced through an optimization algorithm. The nickel-based welding rod with high strength (greater than or equal to 680MPa) and high toughness (impact energy greater than or equal to 70J) at the temperature of-196 DEG C can be rapidly and accurately designed, and the nickel-based welding rod is particularly suitable for welding 06Ni9DR and other low-temperature steel.

The present invention relates to the technical field of element content detection, and in particular to a method for determining the gold content and other element contents in a gold alloy product. The method comprises the following steps: 1) dissolving a sample, adding hydrochloric acid, disodium ethylenediaminetetraacetic acid, tartaric acid, oxalic acid, and perchloric acid to prepare a stable sample solution; 2) preparing a calibration solution composed of the main element contents; 3) measuring calibration samples of gold, silver, copper, zinc, nickel, iron, manganese, and chromium with known concentrations to determine the test conditions for the above elements; and 4) testing the calibration solution samples to construct a calibration working curve showing the relationship between X-ray fluorescence spectrum intensity and the gold, silver, copper, zinc, nickel, iron, manganese, and chromium content. The calibration curve is then used to test the sample to determine the gold, silver, copper, zinc, nickel, iron, manganese, and chromium contents in the gold alloy product to be tested. This method can quickly and accurately determine the gold, silver, copper, zinc, nickel, iron, manganese, and chromium contents in gold alloy products with a gold content of 0.15% to 99.9%.

The invention relates to the technical field of spacers, and particularly discloses a high-toughness aluminum alloy and a preparation method and application thereof. The high-toughness aluminum alloy provided by the invention is composed of Si, Mn, Mg, Zr, Sr, Er, Fe, nano # imgabs 0 # and aluminum according to a specific proportion, pure aluminum, Al-Si alloy, Al-Mn alloy, Al-Zr alloy, Al-Er alloy, # imgabs 1 # alloy and Al-Sr alloy according to a specific proportion are molten in batches, then refining treatment is performed, and finally the high-toughness aluminum alloy is obtained. The prepared high-toughness aluminum alloy has high compressive strength and good flexibility, and can adapt to an existing vacuum die-casting process; in addition, the invention further provides a spacer frame prepared from the high-toughness aluminum alloy and a die-casting die, and the spacer frame also has excellent compressive strength and flexibility. Therefore, the prepared high-toughness aluminum alloy and the spacer frame are better in strength and flexibility, the actual application requirements can be better met, and the problems that an existing die-casting alloy is low in strength and poor in toughness are solved.

1. Title of the invention Method and system for calculating and controlling the remelting temperature of multi-component alloys 2. Technical field The invention relates to a method for determining and controlling the remelting temperature of alloys in metallurgy, in particular for industrial smelting technology and metal recycling. 3. State of the art Existing methods are based on experimental measurements with stepwise temperature increases, which is energy-intensive and environmentally damaging. 4. Object of the invention The aim is to calculate the remelting temperature based on the chemical composition in order to use energy in a targeted manner, optimize the melting process and reduce environmental impact. 5. Solution to the task The procedure includes: 1. Analysis of the alloy composition, 2. Retrieving melting points from a material database, 3. Calculation of the remelting temperature using the mathematical formulas listed in this patent, 4. Real-time temperature monitoring, 5. Computer-aided control of energy supply. 6. Software can automate the process. 6. Key advantages 1. Reduced energy consumption, 2. Faster melting processes, 3. Improved process control, 4. More efficient metal recycling. 7. Areas of application Use in metallurgy, production and recycling of alloys, and in foundries.

The invention relates to an aluminum alloy single wire and cable manufacturing method and an aluminum alloy cable, and the aluminum alloy single wire and cable manufacturing method comprises the steps that S1, Al is melted and then added into AlB5 alloy to obtain aluminum boride liquid, and the aluminum boride liquid comprises, by weight, 99.7-99.9 wt% of Al and 0.001-0.005 wt% of AlB5 alloy; s2, the aluminum boride liquid is refined, Mg, an AlSi20 alloy, an AlFe20 alloy, an AlTi12 alloy and an AlTi5B1 alloy are added into the aluminum boride liquid after refining, alloy aluminum liquid is obtained, and the alloy aluminum liquid comprises, by weight, 0.006 wt%-0.01 wt% of Mg, 0.003 wt%-0.007 wt% of the AlSi20 alloy, 0.003 wt%-0.006 wt% of the AlFe20 alloy, 0.001 wt%-0.005 wt% of the AlTi12 alloy and 0.003 wt%-0.005 wt% of the AlTi5B1 alloy; s3, refining the molten alloy aluminum, and filtering the refined molten alloy aluminum to obtain molten aluminum to be cast; s4, the molten aluminum to be cast is cast, and a blank is obtained; and S5, the aluminum alloy conducting rod is obtained after the blank is rolled. And S6, stretching the aluminum alloy conducting rod to form the aluminum alloy single wire. According to the aluminum alloy single wire, the manufacturing method of the aluminum alloy cable and the aluminum alloy cable, the tensile strength of the aluminum alloy cable can be improved, and the fracture risk is reduced.

The present invention provides a connection structure comprising: a first circuit component having a plurality of first electrodes; a second circuit component having a plurality of second electrodes; and an intermediate layer having a plurality of junctions electrically connecting the first electrodes and the second electrodes, wherein at least one of the first electrodes and the second electrodes connected by the junctions is a gold electrode, and more than 90% of the plurality of junctions include: a first region connecting the first electrodes and the second electrodes and containing a tin-gold alloy; and a second region in contact with the first region and containing bismuth.

A weapon barrel includes an inner core and an outer sleeve. The inner core has a first end, a second end, a bore extending from the first end to the second end, and an external surface extending from the first end to the second end. The inner core includes a material selected from the group consisting of a ferrous alloy, a non-ferrous alloy, a ceramic, a bonded ceramic, and a cemented carbide. The outer sleeve has a first end, a second end, an internal surface extending from the first end to the second end, and an external surface extending from the first end to the second end. The outer sleeve is disposed around and permanently joined to the inner core. The outer sleeve includes a material selected from the group consisting of a metal-matrix composite and a beryllium alloy, the outer sleeve material being located at and between the internal surface and the external surface of the outer sleeve.

The application discloses a mold for preparing high-porosity spherical porous titanium alloy, which comprises an upper mold punch and a lower mold punch provided with upper half-sphere grooves and lower half-sphere grooves; the upper half-sphere grooves are communicated with each other through upper mold flow channels; and the upper mold punch is further provided with a feeding flow channel. In addition, the application further discloses a preparation method of the high-porosity spherical porous titanium alloy. After titanium powder and other metal element powders are mixed and annealed, the titanium powder is mixed with a binder, and then a spherical blank is prepared by using injection molding equipment and the mold; the spherical blank is subjected to degreasing, sintering and gas suspension smelting in sequence to obtain the high-porosity spherical porous titanium alloy. The porous titanium alloy prepared by the application has high sphericity, smooth surface and relatively dense spherical wall, and the porosity can be controlled according to application conditions, so that the application demands in different fields are met. In addition, the application uses element powder in-situ alloying to prepare the spherical porous titanium alloy, the alloy composition can be freely designed, and batch production can be easily realized.

The invention relates to a preparation method of a carbon-loaded copper-gold alloy nano composite material, which comprises the following steps: dispersing HAuCl4, Cu (OAc) 2 and a carbon nano material into a liquid containing a reducing agent to form a first solution; performing ultrasonic treatment on the first solution to obtain a second solution; centrifuging the second solution to obtain a precipitate; and washing and drying the precipitate to obtain the carbon-supported copper-gold alloy nano composite material. According to the preparation method, a first solution containing HAuCl4, Cu (OAc) 2 and a carbon nanomaterial is subjected to ultrasonic treatment, so that the HAuCl4 and the Cu (OAc) 2 are reduced into alloy particles containing Cu < + > on the surfaces by a reducing agent, the alloy particles are loaded on the carbon nanomaterial, and then roasting is performed in a reducing atmosphere, so that Au and Cu < + > are further alloyed, a stable Cu3Au1 crystal form is formed, the valence state of Cu < + > can be stabilized, and therefore, the Cu3Au1 / Cu composite material is obtained. Au has a weak oxyphilic property and can regulate and control an outer-layer electronic structure of a Cu atom, the strength of a Cu-O bond is enhanced, oxygen atom separation is avoided, and finally stable existence of a Cu < + > site under a high reduction potential can be realized.

The invention discloses a gear reducer for an electric drive system of a new energy automobile, which belongs to the technical field of electric drive parts of the new energy automobile and comprises a shell, an input shaft, an output shaft and at least two stages of reduction gear sets arranged between the input shaft and the output shaft. The core innovation points of the gear are as follows: high-alloy carburizing steel or high-strength powder metallurgy alloy is adopted as a gear base material, and carburizing fine grinding and surface strengthening processes such as PVD (Physical Vapor Deposition) coating and laser cladding ceramic layer are combined, so that the hardness, the wear resistance and the antifriction performance of the gear are greatly improved, and the pain points of easy wear and fatigue failure of a tooth surface are solved; meanwhile, the tooth shape of the gear is optimized, the tooth profile with the high contact ratio and the low meshing force angle is adopted, low-viscosity synthetic lubricating oil is matched, an oil way is optimized, and friction and energy loss are reduced; a cooling cavity is integrated in the shell, so that the optimal working temperature of components is guaranteed; the high-performance wear-resistant gear has excellent wear resistance, high transmission efficiency and stability, can reduce the energy consumption of an electric drive system, improves the endurance of a vehicle and the reliability of a power system, and meets the high-performance requirement of a new energy vehicle.

The application discloses a method for producing low-oxygen-content molten steel by adopting an EF+LFV process, wherein 20-30% of weight of slagging materials of smelting raw materials is added with carbon-increasing materials, so that the carbon content of the smelting raw materials reaches 1.20-1.50% of the weight of the smelting raw materials, the oxidation end point temperature is controlled to be greater than or equal to 1630 DEG C, and the carbon content at the oxidation end point is not less than the lower limit of the carbon content required by the smelted steel minus 0.05%; Si-Mn alloy, Si-Fe alloy and carbon-increasing agent are sequentially added into a refining ladle when tapping; and the molten steel is slagged and wire-feeding deoxidized during the refining period; and the molten steel produced by adopting the method has an oxygen content of less than or equal to 20 ppm, so that the purity of the molten steel is ensured to be high, and the production requirements are met.

The present invention discloses a carbon-supported palladium-gold nano-heterogeneous catalyst, a preparation method, and uses thereof. The catalyst comprises a carbon support and active component palladium-gold alloy nanoparticles, with a total metal loading of 3.0 to 15.0 wt.%, including 0.46 to 9.28 wt.% palladium and 1.14 to 12.71 wt.%. The method comprises: 1) dispersing the carbon support in water to obtain a suspension A; 2) adding chloroauric acid to a sodium citrate solution to obtain a suspension B; 3) adding chloropalladic acid to the sodium citrate solution to obtain a solution C; 4) simultaneously adding suspensions B and C to suspension A to obtain a suspension D; 5) ultrasonically treating suspension D, stirring at room temperature, and impregnating the suspension; 6) reducing the suspension with a sodium carbonate solution containing sodium borohydride, filtering, washing, and drying to obtain the catalyst. The method is simple, has mild conditions, and an adjustable ratio of catalytic components. When used for formic acid decomposition to produce hydrogen, the catalyst has the advantages of high catalytic activity, high conversion rate, easy recovery, and multiple uses.

This application discloses a method for manufacturing aluminum alloy wire and aluminum stranded wire, relating to the field of aluminum alloy stranded wire manufacturing technology. The method involves selecting aluminum ingots, magnesium ingots, Al-20Si alloy, Al-20Cr alloy, Al-10V alloy, and lanthanum-cerium mixed rare earth elements as raw materials and smelting them to form an aluminum alloy melt; refining the aluminum alloy melt with inert gas and / or refining agents through in-furnace impurity removal; introducing the aluminum alloy melt into a flow channel integrated with an electromagnetic purification device for external online impurity removal; casting the aluminum alloy melt into an ingot plate, and repeatedly rolling the ingot plate a predetermined number of times using a cumulative rolling method to form an aluminum alloy rod, which is then continuously quenched; allowing the aluminum alloy rod to stand for a predetermined time before drawing it into an aluminum alloy wire, which is then aged to obtain the aluminum alloy wire. Through the above manufacturing method, aluminum alloy wire that meets single-wire tensile strength requirements and has higher conductivity can be prepared with fewer material components.

The invention discloses a magnesium-based rare earth alloy based on electrostatic field-assisted aging heat treatment, which is prepared by the following steps: firstly, preparing an as-cast magnesium-based rare earth alloy through smelting, then, carrying out solid solution treatment to enable a second phase of the as-cast magnesium-based rare earth alloy to be dissolved into a matrix to obtain a solid solution magnesium-based rare earth alloy, and finally, carrying out aging heat treatment at 250 DEG C to obtain the magnesium-based rare earth alloy based on electrostatic field-assisted aging heat treatment. An electrostatic field is connected in the early stage of aging to assist aging treatment; and the precipitation phase proportion can be 45-50% and the hardness can be 90-95 HV by aging for 2 hours in an electrostatic field. The preparation method comprises the following steps: 1, smelting the magnesium-based rare earth alloy; 2, carrying out solution treatment on the magnesium-based rare earth alloy; and 3, carrying out electrostatic field aging treatment on the solid-solution-state magnesium-based rare earth alloy.

The present invention relates to the technical field of functional materials, and specifically relates to a wave-absorbing polyaryletherketone composite material and a preparation method thereof, which include the following materials in weight percentages: at least 3% of an iron-containing alloy soft magnetic powder and at least 60% of polyaryletherketone; wherein the iron-containing alloy soft magnetic powder is introduced during the synthesis of the polyaryletherketone. Specifically, the air in the reaction kettle is first removed by a protective atmosphere. Under stirring and the protective atmosphere, the iron-containing alloy soft magnetic powder, difluorobenzophenone, and diphenol monomer are first subjected to a prepolymerization reaction in a reaction solvent under the action of a salt-forming agent, and then a polycondensation reaction is carried out, and the polyaryletherketone is precipitated and prepared; the iron-containing alloy soft magnetic powder is selected from one or more of an iron-silicon-aluminum alloy, FeSi alloy, FeCrNi alloy, FeNiMo alloy, FeNi alloy, and neodymium-iron-boron alloy; the composite material of the present invention has good wave-absorbing performance and does not cause secondary electromagnetic wave reflection pollution.

Provided is a thermally conductive composition having excellent thermal conductivity and excellent workability. The present invention is a composition containing the following components: (A) 100 parts by mass of gallium and / or an alloy thereof having a melting point of-20 to 100 DEG C; and (B) 2-150 parts by mass of a metal oxide and / or a metal nitride having an average particle diameter of 0.01-200 [mu] m relative to 100 parts by mass of component (A). Wherein the total content of the component (A) and the component (B) in the composition is 95-100 mass%. The gallium alloy of the component (A) in the thermally conductive composition is one or more types selected from the group consisting of a Ga-In alloy, a Ga-Sn-Zn alloy, a Ga-In-Sn alloy, and a Ga-In-Bi-Sn alloy.

The embodiment of the invention provides a silver-gold alloy bump structure and a preparation method thereof. The method comprises the following steps: providing a semiconductor device; a first seed layer and a second seed layer are sequentially formed on the functional surface of the semiconductor device, and the second seed layer is an Au seed layer; forming a silver-gold alloy bump electrically connected with the semiconductor device on the second seed layer; forming a passivation layer on the surface of the silver-gold alloy bump by adopting a plasma passivation process; etching the Au seed layer by adopting a thiourea system etching solution so as to remove part of the Au seed layer; and removing part of the first seed layer. According to the preparation method, the etching rate of the Au seed layer can be improved, corrosion to the silver-gold alloy bump is reduced, a good etching effect is achieved, and the disclosure cost can be maintained; the silver-gold alloy bump structure prepared through the method is free of gold residues and high in reliability.

A high-thermal conductivity composite material is AlNp / ZA27 composite material, including 2%, 4%, 6%, or 8% by volume of aluminum nitride (AlN) ceramic particles and zinc-aluminium-27 (ZA27) alloy. The ZA27 alloy includes 70.52-71.08% by weight of Zn, 25.58˜27.65% by weight of Al, 1.27˜3.45% by weight of Cu, and 0.50% or less by weight of Mg. In the preparation of the high-thermal conductivity composite material, an as-cast AlNp / ZA27 composite material is subjected to homogenizing annealing and reciprocating extrusion.

The invention relates to the technical field of non-ferrous metals, and provides a champagne gold alloy target as well as a preparation method and application thereof. The champagne gold alloy target material provided by the invention is prepared from the following chemical components in percentage by mass: 96 percent to 99 percent of Au, 0.5 percent to 2.4 percent of Fe, 0.3 percent to 0.8 percent of Ag, 0.1 percent to 0.5 percent of In, 0.08 percent to 0.26 percent of Zn, 0.01 percent to 0.02 percent of Nd and 0.01 percent to 0.02 percent of Si. The champagne gold alloy target material is attractive in color and excellent in oxidation resistance and corrosion resistance, the L value of a film plated by the champagne gold alloy target material ranges from 87.2 to 88.5, the a value ranges from 1.3 to 6.4, the b value ranges from 20.4 to 34.2, the champagne gold alloy target material does not change color in an artificial sweat test for 360-432 h, the champagne gold alloy target material does not change color in a salt spray test for 240-360 h, market requirements can be met, and the champagne gold alloy target material is wide in application prospect.

Method for manufacturing a bipolar plate (2), comprising the following steps: - Provision of two steel half-sheets (3, 4), wherein at least one of the two half-sheets (3, 4) has an embossed structure (5), - Construction of a three-dimensional metal structure (7) from a first powder (12) of a metal different from the steel of the half-sheets (3, 4) or from at least two powders (12) of different metals, wherein at least one first powder of the at least two powders (12) is selected to be different from the steel of the half-sheets (3, 4), wherein the metal is selected from the group comprising titanium, titanium alloys, nickel, nickel alloys, chromium, chromium alloys, ferrochrome alloys, copper, copper alloys, gold, gold alloys, platinum, platinum alloys, silver, silver alloys, iridium, iridium alloys, rhodium, rhodium alloys, ruthenium, ruthenium alloys, palladium, palladium alloys, on a first half-sheet (3) of the two half-sheets (3, 4) by means of a laser (10) with green laser light and consequently a wavelength in the range of 495 nm to 550 nm, wherein the first Powder made from the metal copper is used.wherein, when using at least one further different second powder, a further laser in the form of an infrared laser is used to build up the three-dimensional metal structure (7), and , - Forming a materially bonded connection of the 3D metal structure (7) with a second half-sheet (4) of the two half-sheets (3, 4) using the same laser (10) with green laser light, wherein the half-sheets (3, 4) are joined to form a bipolar plate (2).

The present invention is a flexible heart sound sensor based on PDMS-silicon nanofilm, belonging to the field of semiconductor technology. The sensor is composed of a silicon nanofilm and a flexible substrate PDMS, and the silicon nanofilm includes a piezoresistive area, an ohmic contact area and an alloy area, and the material of the alloy area is an alloy of chromium and gold. During preparation, an oxide layer is formed on the top of the SOI wafer, and an ohmic contact area is formed after concentrated boron diffusion. The piezoresistive area is formed after etching the top silicon layer, and the alloy area is formed after sputtering, corroding the metal and annealing. The eaves structure is formed after etching and corroding the buried oxide layer, and the suspended silicon nanofilm structure is formed after drilling and etching the buried oxide layer, and finally the silicon nanofilm is transferred to the flexible substrate PDMS. The sensor has high sensitivity, and at the same time, due to the flexible substrate PDMS, the adaptability and convenience of the sensor are increased.