28 results about "Si element" patented technology

The application relates to a feed for metal injection molding, a preparation method of the feed and a metal product, wherein the preparation method of the feed comprises the following steps: S1, obtaining the following components according to weight parts: 40-50 parts of Fe elements, 2-8 parts of Ni elements, 20-25 parts of Cr elements, 20-25 parts of Co elements, 2-8 parts of Mo elements, 2-8 parts of Cu elements, 0.1-3 parts of Si elements, 1-3 parts of Mn elements, mixing and then heating to melt the material, and then adopting a high-pressure water-gas combined atomization method to obtain mixed powder; S2, obtaining a forming agent; S3, preheating the mixed powder obtained in S1 under vacuum conditions, then adding the forming agent into the mixed powder for mixing, and then performing plasticizing extrusion granulation to prepare the feed. The feed can meet the size precision requirements of MIM injection, green compact degreasing sintering and related post-process machining, the existing MIM materials on the market cannot simultaneously meet the problem of high polishable hardness, and the obtained metal product has the comprehensive advantages of appearance and hardness.

The application relates to an agate color coated workpiece and a preparation method thereof. The preparation method comprises the following steps: S1, depositing a transition layer on a base material by adopting a magnetron sputtering mode; S2, depositing a TiAlN intermediate layer on the transition layer in S1 by adopting the magnetron sputtering mode; and S3, depositing a TiAlSiN agate color coating layer on the TiAlN intermediate layer in S2 by adopting the magnetron sputtering mode. In step S3, the sputtering power of the Si target is controlled, so that the percentage of Si elements in the deposited TiAlSiN layer is 7%-8%. The application obtains a special agate color coated workpiece, and the workpiece has high hardness and wear resistance, and has a wider application prospect.

The application discloses a low-cost rare earth high-strength dual-phase steel and a preparation method and application thereof, and belongs to the technical field of rare earth dual-phase steel. The low-cost rare earth high-strength dual-phase steel has the following chemical component compositions and mass percentages: C: 0.05-0.09%; Si: 0.3-0.5%; Mn: 1.0-1.5%; Als: 0.020-0.055%; Cr: 0.25-0.55%; Ti: 0.05-0.09%; Ce: 0.0030-0.0070%; P: <=0.010%; S: <=0.004%; N: <=0.004%, and the rest is Fe and inevitable impurity elements. The application does not add molybdenum and niobium, and through the addition of Mn and Si elements in a specific proportion, Cr and Ti in a specific proportion and rare earth Ce, and in combination with a multi-stage homogenization treatment process, a high-elongation, high-hardness, low-cost rare earth high-strength dual-phase steel is obtained.

The application discloses a diffusion source, a rare earth permanent magnet and a preparation method and application. The diffusion source comprises a heavy rare earth layer and a nickel alloy transition layer; one surface of the nickel alloy transition layer is attached to the heavy rare earth layer, and the other surface is used for being attached to an initial magnet to be diffused; the nickel alloy transition layer is formed by raw materials comprising a nickel-containing alloy powder and an X metal powder; wherein the nickel-containing alloy powder is an aNi·bSi·cB alloy powder; wherein a is a value of weight percentage of Ni element, b is a value of weight percentage of Si element, and c is a value of weight percentage of B element, and the ratio of a, b and c is 84-98.3:1.2-8.5:0.5-7.5; the X metal is selected from at least one of sub-group elements; and the weight ratio of the nickel-containing alloy powder to the X metal powder is 85-95:5-15. The diffusion source is beneficial to improving the coercive force of the magnet.

The application discloses a high-strength and high-plasticity Mg-Y-Zn-Si-Li-Al alloy and a preparation method thereof, and relates to the technical field of light alloy processing. 97.5 Y1Zn 0.5 In the Mg 97.5 Y1Zn 0.5 Si1base alloy, the Si element is combined with the Y element to form a YSi hard and brittle phase, which is easy to hinder the elongation of the alloy; the addition of the Li element plays a grain refining role on the one hand, effectively improves the strength of the alloy, and optimizes the second phase form on the other hand, promotes the transformation of the second phase to the nanometer level, provides more slip paths for dislocation movement, and avoids plasticity deterioration; the Al element is further combined with the Y element to form a high-strength Al2Y strengthening phase, which not only reduces the precipitation of the hard and brittle phase, but also stabilizes the organizational structure through the pinning effect at the grain boundary.

The application discloses a cutting tool deposited with a multilayer nanocomposite coating and a preparation method thereof, and relates to the technical field of cutting blades. The spherical alumina sand particles are used in the application, different particle sizes of the sand particles are compounded, large particle size alumina sand particles A are introduced, the coating adhesion is improved, and then the wear resistance of the cutting tool is improved. The (TiZrHfNb)N alloy transition layer is deposited in the application, the element interdiffusion between the coating and the substrate is effectively blocked, the high-temperature stability of the cutting tool is improved, the internal stress of the coating is relieved, and the interface bonding force is improved. The Si element in the (TiAlSi)N layer deposited in the application forms an amorphous phase, the high-temperature stability of the cutting tool is improved; the (TiNbCN) layer generates an oxide phase with self-lubricating characteristics at high temperature, the wear resistance can be improved; the addition amount of Si is increased, a dense oxide film is formed at high temperature to protect the cutting tool, and thus the wear resistance is improved.

This invention discloses a post-weld heat treatment process to improve the strength and toughness of welded joints made of 1600MPa grade ultra-high strength steel. The core technology utilizes a composite heat treatment of "precision quenching + low-temperature tempering" to solve the problem of strength-toughness mismatch caused by elemental segregation and uneven microstructure in the welded joint. The process involves oil quenching at 840-850℃ for 5.4-5.8 hours, followed by oil cooling at 200-220℃ for 7.4-7.8 hours. This effectively reduces the segregation of Cr, Mo, W, and Si elements, transforming the weld microstructure from martensite to tempered martensite and precipitating uniform carbides. After treatment with this invention, the tensile strength of both the base metal and the weld joint is ≥1740MPa, the impact energy of the weld joint is increased to over 34J, the impact energy of the base metal reaches over 69J, and the uniformity of hardness distribution is improved by 40%. This process is suitable for welded components made of 1600MPa grade ultra-high strength steel in the automotive, aerospace, and other fields, significantly improving service safety and lifespan.

The application relates to an aluminum alloy for a battery water cooling plate and a preparation method thereof, which comprises the following materials in percentage by mass: Ni 4-6%, Mn 0.4-0.6%, Fe 0.4-0.8%, Si 0.5-0.8%, Mo 0.5-0.8%, Zr 0.2-0.3%, the balance being aluminum and inevitable impurity elements, the content of each impurity element being less than or equal to 0.1%, and the total content of the impurity elements being less than or equal to 0.3%. The application further improves the high-temperature strength of the alloy by innovatively introducing an AlFeMoSi quaternary high-temperature stable phase, the melting point of the precipitated phase is greater than 600 DEG C, the high-temperature welding process is not affected, meanwhile, the addition of Mo consumes part of Fe and Si elements, the allowable amount of the Fe and Si elements in the alloy is increased, and the casting alloy cost is effectively reduced.

The present disclosure relates to a substrate processing method and a substrate processing apparatus. In a case where a first metal film composed of a metal other than Ru is siliconized on a Si-containing layer exposed on a surface of a substrate, the Si-containing layer is prevented from being siliconized. The substrate processing method of the present disclosure includes the following steps: forming a first metal film composed of a metal other than Ru on a Si-containing layer exposed on a surface of a substrate; and supplying a Si element to the substrate, and forming a metal silicide film from the Si element and the first metal film.

The embodiment of the application relates to the technical field of computer material science, and particularly relates to a method for determining the segregation degree, copper-rich phase morphology and time evolution of reactor pressure vessel steel elements under irradiation conditions, which comprises the following steps: determining the total free energy of the reactor pressure vessel steel according to the concentration of Si elements in the reactor pressure vessel steel, the chemical free energy of Si elements in a quinary alloy, the elastic free energy and gradient free energy of the quinary alloy system; obtaining the diffusion coefficient of the elements according to the irradiation conditions and the material properties of the reactor pressure vessel steel, and determining the alloy atom migration rate tensor according to the diffusion coefficient; and determining the element concentration and the order parameter of the copper-rich phase of the reactor pressure vessel steel according to the total free energy of the reactor pressure vessel steel and the alloy atom migration rate tensor. The method can make the predicted segregation degree, copper-rich phase morphology and time evolution of the reactor pressure vessel steel more consistent with the actual service conditions of the reactor.

The steel sheet for plating according to an aspect of the present invention has a GDS profile of an Mn element and a GDS profile of an Si element, which are observed from the surface to the depth, sequentially including a maximum point and a minimum point, wherein a difference of converted concentration of Mn is 10% or more, and a difference of converted concentration of Si is 10% or more.

The present application relates to the field of automobile lightweight material welding technology, in particular to a laser welding method of 2GPa grade hot forming steel and low carbon steel. The method first butts and assembles the ultrahigh strength hot forming steel and the soft low carbon steel, and uses laser beam to weld, wherein the laser beam spot center is deviated to the low carbon steel side by 0.5-2mm; after welding, immediately use laser to perform single pass tempering treatment on the weld area. Through laser offset, the thermal physical mismatch of heterogeneous materials is effectively coordinated, and the formation of brittle Fe-Al-Si intermetallic compound of Al and Si elements in the molten pool is inhibited; the subsequent laser tempering optimizes the performance of the double side heat affected zone, and relieves the softening of the high strength steel side and the hardening of the low carbon steel side. The weld forming of the present application is excellent, the joint shear strength recovery rate reaches more than 90% of the soft base material, the fatigue life is significantly prolonged, and it is especially suitable for batch manufacturing of automobile lightweight safety structural parts.

The application provides a Nb micro-alloyed oriented silicon steel decarburization annealing oxidation layer structure regulation method, and relates to the technical field of oriented silicon steel decarburization annealing. The Nb micro-alloyed oriented silicon steel decarburization annealing oxidation layer structure regulation method comprises the following steps: S1, selecting oriented silicon steel with a Si element mass fraction of 3.0% as a base material, adding Nb element to the base material for micro-alloying treatment, and preparing Nb micro-alloyed oriented silicon steel; S3, placing the Nb micro-alloyed oriented silicon steel prepared in S1 in the decarburization annealing atmosphere prepared in S2 for decarburization annealing treatment, and precisely regulating the thickness of the oxidation layer and the content ratio of spherical oxides to strip-shaped oxides in the oxidation layer after decarburization annealing of the oriented silicon steel by regulating the Nb element addition amount, the decarburization annealing temperature and the holding time. The regulation law of Nb and process parameters on the oxidation layer is clear, the oxidation layer structure is precisely controllable, and the process standardization is supported.

A substrate processing method includes: forming a first metal film, composed of a metal other than Ru, on an Si-containing layer exposed on a surface of a substrate; and supplying an Si element to the substrate, and forming a metal silicide film from the Si element and the first metal film.

This invention provides a method for preparing an aluminum-silicon-copper sputtering target. The method includes: (I) providing aluminum, silicon, and copper raw materials, and dividing the aluminum raw material into two parts; (II) melting one part of the aluminum raw material to obtain an aluminum melt, then adding the silicon and copper raw materials to the aluminum melt, and performing a first melting at a first temperature to obtain a primary alloy melt, adding the remaining aluminum raw material to the aluminum-silicon-copper alloy melt, and performing a second melting at a second temperature to obtain a secondary alloy melt; (III) sequentially degassing, refining, and slag removal from the secondary alloy melt to obtain a purified alloy melt; (IV) sequentially casting and cooling the purified alloy melt to obtain an aluminum-silicon-copper ingot; wherein the first temperature is higher than the second temperature. This invention solves the problem of Si element aggregation in high-purity aluminum-silicon-copper alloys and can avoid silicon segregation in alloy ingots.

The steel sheet for plating according to an aspect of the present invention has a GDS profile of an Mn element and a GDS profile of an Si element, which are observed from the surface to the depth, sequentially including a maximum point and a minimum point, wherein a difference of converted concentration of Mn is 10% or more, and a difference of converted concentration of Si is 10% or more.

This invention proposes a polycrystalline Co-V-Ga-Si alloy, its preparation method, and its applications, belonging to the field of shape memory alloy solid-state refrigeration technology. The general chemical formula of the polycrystalline Co-V-Ga-Si alloy is Co. 50 V 35 Ga 15‑x Si x 0X1.5, where the subscript indicates atomic percentage content. The martensitic transformation temperature range of the alloy is 220-310 K, the fracture stress is greater than 1080 MPa, and it can produce an adiabatic temperature change greater than -5.1 K under 800 MPa stress. This invention improves the elastic-thermal properties of the Co-V-Ga alloy by introducing a certain amount of semiconductor Si element, and effectively reduces the critical stress driving the martensitic transformation and the stress hysteresis during the transformation process. This invention has the advantages of simple process flow, excellent hyperelastic properties, and large elastic-thermal temperature change of the alloy, and has broad application prospects in the field of solid-state refrigeration.

The application relates to the technical field of ceramic matrix composite self-repairing machining, and discloses a high-surface-quality ceramic matrix composite self-repairing machining method. In view of the difficulties that micro cracks, micro defects, continuous fiber breakage or damage are easily generated during machining of ceramic matrix parts, a special tool with a BCC metal gradient layer on the surface is adopted, high-speed dry milling is used to make the cutting point temperature exceed 800 DEG C, Si elements are diffused with the BCC metal gradient layer as a carrier, and the surface of the part is repaired. The method can reduce the local hardness of the material, inhibit crack propagation, improve the interface bonding between the fiber and the matrix, realize low-damage cutting, and is reliable in process, thereby providing support for batch manufacturing of hot end parts of an aero-engine.

The application discloses a p-type nitride layer, a preparation method thereof and a nitride semiconductor device. The p-type nitride layer comprises a front layer, an intermediate layer and a rear layer, the doping concentration of Si elements in the front layer decreases; a plurality of composite microstructures are arranged at the interface between the front layer and the intermediate layer, the composite microstructures comprise nanocolumnar bodies and top microstructures, and have differentiated height distribution; the nanocolumnar bodies comprise Si nanocolumns and SiN dielectric layers, and the material of the top microstructures comprises AlN. The application utilizes the polarization effect between the plurality of composite microstructures with different heights and the intermediate layer to generate a huge energy band offset, forms a high-concentration two-dimensional hole gas near the interface, increases the hole concentration in the nitride intermediate layer, greatly improves the hole injection efficiency, and further improves the working efficiency of the device, reduces the working voltage, and significantly reduces various negative effects under a large-current working condition.

The application provides a brazing process of an aluminum alloy material for brazing. The material of a runner plate used in the brazing process is an aluminum rare earth material, which comprises, in percentage by mass, 7.0-9.0% of a rare earth metal element RE, 0.4-0.6% of an Fe element, 0.6-1.2% of an Mn element, 0.3-0.5% of a Cr element, 0.02-0.15% of an Mg element, 0.1-0.2% of a Ti element, 0.02-0.2% of a V element, 0.02-0.1% of a B element, ≤0.1% of an Si element, ≤0.01% of a Cu element, the balance of an Al element and inevitable impurities, and ≤0.05% of a single impurity element. After brazing by the brazing process, the weld is full and has high strength, and the brazing process is suitable for brazing of runner plates with various complex structures.

The present application belongs to the field of austenitic stainless steel structural materials for high temperature, and particularly relates to a lead-based high stress relaxation resistant austenitic steel for fastener and a preparation method thereof. The chemical composition of the steel is as follows in terms of percentage by weight: C 0.007-0.03%; Si 3.0-4.0%; Mn ≤1.0%; S ≤0.005%; P ≤0.01%; Cr 15.0-17.0%; Ni 23.0-27.0%; Mo 0.5-2.0%; Ti 1.0-2.0%; Al 0.2-0.4%; O ≤0.003%; N ≤0.005%; and the balance being Fe. The Si element with strong oxidation resistance is added to the austenitic steel, and the preparation method comprises the following steps: batching, vacuum induction furnace smelting, vacuum consumable, low-temperature forging, solid solution treatment and aging treatment. The high stress relaxation resistant austenitic steel is successfully controlled, and the dual-scale nanoscale G phase (Ni 16 Ti6Si7) and Ni3(Al,Ti) phase synergistic strengthening is obtained through aging treatment, which improves the stress relaxation resistance of the austenitic steel. Meanwhile, the high Si ensures the lead-bismuth corrosion resistance of the steel, and solves the problem that the traditional austenitic steel for fastener cannot simultaneously satisfy the high stress relaxation resistance and the lead-bismuth corrosion resistance.

This invention provides a 43 kg grade weathering steel welding electrode, comprising a core and a coating wrapped around the core. The coating comprises the following components by mass percentage: 30-40% marble, 20-30% fluorite, 3-7% sodium fluoride, 1-3% zircon sand, 3-7% rutile, 2-4% quartz, 2-4% 45# atomized ferrosilicon, 1.5-3% metallic manganese, 1.4-2.5% nickel-magnesium alloy, 0.7-1.5% metallic chromium, 0.6-1.2% copper powder, 0-1.5% silicon-zirconium iron, 0.3-0.7% boron trioxide, 0-1% soda ash, 0-1% CMC, with the balance being iron powder. This welding electrode transfers appropriate amounts of Ni, Cr, Cu, and Si elements to the weld metal through its coating, giving the weld metal excellent weather resistance, with a weather resistance index (I) greater than 6.5. Simultaneously, by adjusting the coating composition, the content of C, Mn, Si, and other alloying elements in the weld metal is controlled, ensuring a tensile strength of 430–550 MPa and a low-temperature impact absorption energy of over 47 J at -20°C, exhibiting stable mechanical properties.

This invention discloses a cold-rolled steel sheet, which, by mass percentage, comprises the following chemical elements: C: 0.190–0.250%, Si: 0.60–1.30%, Mn: 2.00–2.50%, Al: 0.20–0.80%, with the remainder being Fe and unavoidable impurities. The microstructure of the cold-rolled steel sheet includes ferrite, retained austenite, and at least one of the following: distributed martensite and tempered martensite; wherein the carbon content of the retained austenite satisfies: C RA ≥(833-Tp-7400*W) Mn -W Si ) / 24100*100%, C RA W represents the carbon content (wt%) of the retained austenite. Mn and W Si These represent the mass percentages (wt%) of Mn and Si elements in the cold-rolled steel sheet, respectively, and Tp represents the distribution temperature during continuous annealing, which is 350–430°C. This invention discloses a method for manufacturing cold-rolled steel sheets. The cold-rolled steel sheet of this invention possesses high strength-ductility product, high yield strength, and low alloy cost.

This invention relates to a method for preparing a non-uniform diffusion coating on the surface of an elevator safety clamp block. The invention first performs a specific heat treatment on the clamp block substrate to control the grain size of the substrate, thereby better supporting the surface coating. The first diffusion layer close to the substrate contains laser-infiltrated alloyed Al and / or Si elements, which not only improves the strength of the underlying coating but also utilizes the Al / Si to form a stable Al2O3 and SiO2 oxide film during high-temperature friction, improving the coating's resistance to high-temperature oxidation. The Fe3C, Fe2B, and FeB compounds intermingled in each diffusion layer, through the second-phase reinforcement of carbides and borides, not only improve the coating's wear resistance but also regulate and stabilize the coating's friction coefficient by controlling the content and distribution of carbides and borides. Thus, the coating of this invention can balance wear resistance, heat resistance, and the stability of frictional braking force, avoiding problems such as reduced frictional braking force and braking failure during braking.

This invention discloses a profile extrusion production process for improving the anodizing effect of 7075 aluminum alloy, relating to the field of aluminum alloy pressure processing technology. By adjusting the extrusion temperature and extrusion ratio, this invention breaks down the insoluble second phase, reduces the size of coarse second phases, and uniformly disperses them within the soft Al matrix. This avoids the distribution of coarse Mg2Si and Fe-containing phases along the extrusion direction, eliminating the defect of black lines after anodizing. It avoids the existing method of refining and filtering the melt by reducing the Fe and Si element content, significantly reducing raw material prices and production costs, and improving production efficiency. Simultaneously, the resulting 7075 aluminum alloy extruded profiles also possess excellent mechanical properties.

A main object of the present disclosure is to provide a method for producing an active material wherein a volume variation due to charge / discharge is reduced. The present disclosure achieves the object by providing a method for producing an active material, the method comprising steps of: a preparing step of preparing a LiSi precursor including a Si element and a Li element, and a void forming step of forming a void by extracting the Li element from the LiSi precursor by using a Li extracting solvent, and the LiSi precursor includes a crystal phase of Li22Si5.

This invention relates to a method for preparing ultra-high hardness titanium alloy plates, specifically relating to the field of titanium and titanium alloy materials technology. The method includes preparing an ingot and determining the β transformation temperature T. β The process includes high-temperature homogenization, upsetting and drawing deformation of the billet, three-stage upsetting and drawing in the single-phase region, three-stage upsetting and drawing in the two-phase region, slab shaping, hot rolling, and solution-aging treatment. The chemical composition of the titanium alloy, by weight percentage, is: Al: 3.0%-6.0%, V: 0.5%-5.0%, Cu: 2.0%-6.0%, Si: 2.0%-6.0%, Zr: 2.0%-10.0%, Sn: 0%-2.0%, Nb: 1.0%-3.0%, Mo: 0.5%-3.0%, Fe: 0.5%-2.0%, with the balance being Ti. This invention achieves a Rockwell hardness of 49-54 HRC by synergistically combining α-phase stabilizing elements with β-phase stabilizing elements, combined with the nanoscale precipitates formed by Cu and Si elements during aging. This method has a wide solution-aging temperature window, good process stability, and the resulting sheet material has both good hot working plasticity and thin sheet forming ability, making it suitable for wear-resistant structural parts, industrial tool substrates, and mold plates.

This invention provides a high-temperature stable pulse energy storage ceramic composition and its preparation method, relating to the field of pulse energy storage ceramic materials technology. The ceramic composition is based on Ba(Zr) x Ti 1‑x The main component is a perovskite compound (Bi2O3). In addition, it contains Bi as a first secondary component (Bi element) in the form of a composite of Bi2O3 and Bi2O3·nTiO2, as well as Ca, Sr, Mg, Mn, and Si elements. Its temperature coefficient of dielectric constant (TCC) meets -750±120ppm / ℃ over a wide temperature range of -55℃ to 125℃. The ceramic composition of this invention possesses high dielectric constant, low dielectric loss, high breakdown field strength, and a fine-grained structure, making it suitable for high-reliability pulse power capacitors.