79 results about "Al content" patented technology

The invention belongs to the technical field of metal materials, and relates to a CoNiVAlX (x is greater than or equal to 0 and less than or equal to 0.5) multi-principal-element heterostructure entropy alloy system and a preparation method thereof. The chemical composition (atomic percent) of the alloy contains Co, Ni, V, Al and a trace regulator, flexible matching of strength and toughness is realized in a wide temperature range of-263 DEG C to 800 DEG C by regulating the Al content and a thermal mechanical treatment process, and various mechanical states such as'high ductility-medium strength 'and'high strength-medium ductility' can be obtained; the preparation process is based on a mature metallurgical technology and does not depend on special equipment, and large-size stable preparation can be achieved. Tests prove that the alloy system is wide in toughness and adjustable, the toughness balance in a wide temperature range is realized, the application requirements in an extreme environment are met, and the alloy system has a good industrial popularization prospect.

The invention relates to a giant dielectric barium titanate-based ceramic dielectric material and a preparation method and application thereof, the giant dielectric barium titanate-based ceramic dielectric material comprises barium titanate and doping elements, and the doping elements are composed of Mg, Ca, RE, Al and Si; the content of barium titanate is 90 to 99.7 mol%, the content of Mg is 0.1 to 4 mol%, the content of Ca is 0.25 to 0.55 mol%, the content of RE is 0.1 to 3.5 mol%, the content of Al is 0.002 to 0.3 mol%, and the content of Si is 0.01 to 4.0 mol%. The ceramic dielectric material provided by the invention has the advantages that the average grain size is small, the room-temperature dielectric constant is greater than 10 < 4 > order of magnitude, the dielectric constant is giant, the dielectric stability in a wide temperature range is good, and the resistivity is greater than 10 < 9 > omega.cm; the traditional solid-phase method process is adopted, and is suitable for large-scale industrialization.

This invention discloses a continuous gradient Cr-Al coating for zirconium alloy cladding and its preparation method, belonging to the field of nuclear zirconium alloy coating technology. The method of this invention first pre-activates the zirconium alloy cladding surface with Cr ions, followed by depositing a Cr-Al coating with a continuous gradient composition. This process involves maintaining the bias voltage of the Cr target source at 3000-5000V, and increasing the bias voltage of the Al target source from 0V to 3000-5000V in 3-15 increments, with an interval of 20-140 minutes between each increment and an increment of 200-1000V. This results in a region where the Cr content continuously decreases and the Al content continuously increases from the interface between the Cr-Al coating and the Cr-ion-preactivated zirconium alloy cladding surface to the outer surface of the Cr-Al coating. This method solves the problem of existing methods easily leading to damage to the internal structure of the coating.

According to an embodiment of the present invention, the non-oriented electrical steel sheet comprises, by weight %, 1.5 to 5.0% Si, 0.1 to 2.0% Al, 0.1 to 2.0% Mn, 0.001 to 0.08% Sn, 0.001 to 0.08% Sb and 0.0002 to 0.0007% B, with the balance being Fe and unavoidable impurities. When the elemental content is measured along the thickness direction of the steel sheet in a surface portion ranging from the surface to the interior in a range of 0.3 to 1 μm, the weight ratio of the maximum Si content to the maximum Al content is 25 or less.

Provided is a method for producing a TiAl-based alloy by sintering a mixed raw material powder comprising a Ti powder and an Al powder as main raw materials, the method being characterized in that: the TiAl-based alloy is produced by heating at a heating rate of 10 DEG C or less per minute within a predetermined temperature range between 550 DEG C and 750 DEG C; or the isothermal holding time is set while the temperature is increased by stages, and the alloy with the Al content ratio at any 0.5 mm * 0.5 mm section in the sintered body being within + / -3 at% of the Al component ratio in the mixed raw material powder is obtained.

Provided is a plated steel sheet provided with a base material steel sheet and a plating layer formed on the surface of the base material steel sheet, the plating layer having a prescribed chemical composition, the plating layer comprising an Fe-Al phase located at the interface with the base material steel sheet and a main layer located on the Fe-Al phase, and in the cross section of the main layer, the thickness of the Fe-Al phase is greater than that of the main layer, and the thickness of the Fe-Al phase is greater than that of the main layer. The surface area ratio of an Mg-Al-Zn-Si intermetallic compound phase having an Al content of 10% by mass or more is 0.010% or more, the Fe-Al phase contains, in mass%, 3.0-15.0% of Si and 2.0-15.0% of Zn, and the amount of the plating layer deposited on each surface is 20 g / m2 or more.

The application provides 800MPa-grade hot-dip aluminized silicon high-hole-expanding multiphase steel and a preparation method thereof. The composition of the steel plate is as follows in terms of percentage by weight: C: 0.06% to 0.09%, Si: 0.1% to 0.4%, Mn: 1.8% to 2.5%, Cr: 0.1% to 0.4%, Mo: 0.05% to 0.3%, Ti: 0.01% to 0.03%, Nb: 0.01% to 0.03%, P: less than or equal to 0.02%, S: less than or equal to 0.005%, 1 / 3: less than or equal to Mo / Cr: less than or equal to 2 / 3, 2.2%: less than or equal to Mn+Cr: less than or equal to 2.8%, and the balance of Fe and inevitable impurities. The chemical composition of the coating includes the following components in terms of percentage by weight: Al content: 88% to 93%, and Si content: 7% to 12%. The production method of the steel plate comprises a series of processes such as smelting, hot rolling, pickling, cold rolling, continuous annealing and aluminized silicon plating, and the structure of the steel plate comprises ferrite, bainite and martensite. In terms of the planar area method, the ferrite content is 18% to 35%, the bainite content is 35% to 62%, and the martensite content is 10% to 40%. The mechanical properties of the steel plate of the application are as follows: tensile strength is more than 800MPa, yield strength is 620MPa to 750MPa, elongation is greater than 14%, and the hole-expanding value is more than 50%, so that the steel plate has good strength and plasticity and formability, and meanwhile, the hole-expanding performance is excellent.

The present invention provides a steel material that provides high strength and excellent low-temperature toughness for machine structural components. The steel material of this disclosure has a chemical composition, by mass%, of C: 0.20-0.48%, Si: 0.20-1.30%, Mn: 0.80-2.00%, P: 0.050% or less, S: 0.010-0.090%, Cr: 0.05-0.50%, V: 0.05-0.30%, Ti: 0.0001-0.0055%, Al: 0.005-0.050%, N: 0.003-0.030%, Ca: 0.0001-0.0050%, and O: 0.0030% or less, with the remainder being Fe and impurities, and has a number density ND of coarse inclusions with an equivalent circle diameter of 3.0 μm or more of 0.70 inclusions / mm². 2 The following conditions must be met: Among the coarse inclusions, the number percentage NR of coarse specific inclusions that satisfy formula (1) in terms of mass %, such as Mn content, Al content, Ti content, and V content, is 75% or less. (Mn+Al) / (Ti+V)<0.30 (1)

The invention discloses a preparation method of a high-yield ratio die steel CX13-8. The high-yield ratio die steel comprises the following chemical components in weight percentage: C content ≤0.05%, Si content ≤0.18%, Mn content ≤0.10%, S content ≤0.008%, P content ≤0.018%, Cr content 12.25%-13.25%, Ni content 7.50%-8.50%, Mo content 2.00%-2.60%, Al content 0.90%-1.35%, and the balance is Fe. During the preparation, the high-yield ratio die steel is smelted in an induction vacuum degassing furnace + argon protection electroslag method to meet the purity requirements of the die steel. The final forging adopts low-temperature large deformation forging to refine the grains. After solid solution + aging heat treatment, the high-yield ratio die steel meets the standard requirements of CX13-8. The high yield ratio can achieve lightweighting of the die material.

The application discloses a kind of superhard anti-cavitation high-entropy alloy coating and preparation method thereof.The atom percentage of the superhard high-entropy alloy coating described herein is: Al 20%~26%, Cr 30%~34%, Co 30%~34%, Ni 16%~22%.The high-entropy alloy coating of the application can maintain solid solution stability under the condition of higher Al content, and will not appear element desorption and heterogeneous nucleation during powdering and spraying process.The crystal structure is single body-centered cubic phase (BCC), and can have very high hardness without any post-processing process: nano-hardness can reach 9.1~11.4 GPa, and microhardness is 858~881 HV 0.1 , which is the maximum value of high-entropy alloy coating prepared by the same process reported in China at present, and is suitable for popularization and application as anti-cavitation coating on the surface of various flow mechanical components.

The invention discloses a brazing method for increasing the service temperature of a brazed joint and reducing the stress of the joint, and belongs to the technical field of welding. According to the method, a nonmetal base material, an aluminum alloy and SnZn hypereutectic brazing filler metal are pretreated and assembled into a sandwich structure, and then three-step ultrasonic-assisted brazing is carried out, specifically, in the first stage, an oxidation film is broken to achieve initial connection, in the second stage, unbalanced dissolution of the aluminum alloy is induced to enable the Al content of a brazing seam to be sharply increased, and in the third stage, Al diffusion densification is promoted. According to the mechanism, ultrasonic cavitation and acoustic streaming effects are utilized, the brazing seam melting point is increased through unbalanced dissolution of Al, the thermal expansion coefficient is reduced, low-temperature connection and high-temperature service are achieved, and residual stress is reduced. The method is simple in process, low in cost and suitable for connection of various non-metals and aluminum alloys, and the strength, heat conductivity and reliability of the connector can be improved.

A zinc-plated steel sheet for hot stamping includes a steel sheet having a predetermined chemical composition and a zinc plating film disposed on the steel sheet. In the zinc plating film, the plating adhesion amount is 15.0 g / m2 or more and less than 40.0 g / m2, the Fe concentration is 1.5 mass % or more and 8.0 mass % or less, the Al content is 100 mg / m2 or more and 400 mg / m2 or less, the Al concentration is 0.50 mass % or more and 3.00 mass % or less, and the remainder consists of Zn and impurities.

A system (1000) including a computer (200) estimates the content of a specific chemical element in molten material available at an opening (110) of a metallurgical vessel (100). In the system (1000), a pyrometer (140-P) monitors the opening (110) and provides radiation data (150-P) representing thermal radiation from the molten material (300) at the opening (110) for at least two wavelengths (λ1, λ2). The computer (200) processes the radiation data (250) to estimate the content using a pre-trained estimation module (250). Because phenomena (160) at the opening (110), such as deposits, fumes, or reflections, can interfere with the estimation, the system (1000) further includes a camera (140-C) monitoring the opening (110 and an image classification module (260) for identifying the phenomena (160). The computer (200) obtains a phenomenon-based reliability classification (RC) and improves the overall estimation accuracy by filtering reliable emission data from being processed or ignoring content based on unreliable emission data.

To suppress poor inflow of mold powder.SOLUTION: When steel having a dissolved Al content of 0.3 mass% or more and a Ca content of less than 10 ppm is subjected to continuous casting, a range of Al2O3 content in mold powder inside a mold, in which poor inflow of the mold powder does not occur, is determined by using a consumption amount of the mold powder, and values of A, B, and a to d satisfying the following equation are determined when the Al2O3 content X (mass%) is within the determined range of the Al2O3 content: 20.33A+0.58×(7000a-0.00079b-0.00067c-0.038d+9.63)+13.75B=X, wherein A: dissolved Al content (mass%) in molten steel, B: casting speed (m / min), a: Ca content (mass%) in the alloy added to molten steel until completion of secondary refining, b: amount of oxygen gas (Nm3) supplied to molten steel during secondary refining, c: circulation gas flow rate for molten steel (NL / min) during secondary refining, and d: circulation time (min) for molten steel during secondary refining.SELECTED DRAWING: None

This application provides a steel material with ultra-high strength of 2000MPa and above, a hot gas expansion tube component, a welded pipe, and a manufacturing process. The component, welded pipe, and steel material, by mass percentage, contain: C: 0.35~0.50%, Mn: 0.20~1.20%, Si: 0.25~0.85%, Cr: 0.20~0.70%, Al: 0.25~0.65%; the sum of Si, Cr, and Al content is 1.0~2.2%, and (Si+Cr) / Al is 2.0~3.5; the thickness t, alloying elements, and critical cooling rate v of the component, welded pipe, or steel material are also specified. C Satisfies the formula: , v C With a temperature range of 10~21℃ / s, the hot gas expansion tube component of this invention possesses ultra-high strength and good toughness.

The invention relates to the technical field of high-temperature alloy metallurgy preparation, in particular to an additive manufacturing nickel-based high-temperature alloy with high Al and Ti content and a preparation method of the additive manufacturing nickel-based high-temperature alloy. The additive manufacturing nickel-based high-temperature alloy comprises the following components in percentage by weight: 17-19% of Cr, 5-8% of Co, 5-7% of W, 3.5-4.5% of Mo, 3-5% of Al, 1-1.6% of Ti and the balance of Ni. According to the method, firstly, the Al content in a nickel-based superalloy system is adjusted, alloy powder for additive manufacturing is prepared, then fusion covering of the alloy is conducted, finally heat treatment is conducted, Al is introduced into the nickel-based superalloy through ball milling, the content is designed, the tensile strength of the obtained additive manufacturing nickel-based superalloy at 900 DEG C can reach 570 MPa or above, and the performance is improved by 70% or above. Meanwhile, the component design alloy is suitable for additive manufacturing, no crack exists in an alloy sample for metallographic observation, and manufacturing defects are reduced.

A conductor for a power transmission cable has a first conductor element and a second conductor element connected by a welding joint. The welding joint has a welding material alloy where the welding material alloy has an Al content of from 90% to 98% by weight, a Ni content of from 2% to 8% by weight, and a content of other metals and / or substances from 0% to 2% by weight, based on the total weight of the welding material alloy, wherein the Al content, Ni content and content of other metals and / or substances sum up to 100% by weight.

The application discloses high-sulfur steel, including components and mass percentage: C: 0.67%-0.73%, Si: 0.15%-0.25%, Mn: 0.45%-0.65%, P: ≤0.045%, S: 0.060%-0.070%, Cr: 0.10%-0.20%, Mo: ≤0.06%, Ni: ≤0.20%, V: 0.03%-0.04%, Al: ≤0.03%, N: 0.012%-0.016%, the balance is Fe and impurities.The application provides a preparation process of high-sulfur steel, including the following steps: step S1, converter process; step S2, refining process; step S3, VD process; step S4, continuous casting process.The beneficial effect is that the Al content in the steel is controlled at a relatively high level to offset the secondary oxidation caused by the addition of quartz sand at the end of the refining, that is, the low oxygen state in the steel is ensured by Al.

This invention discloses an analytical method for Zr and Al content in tungsten-copper alloys based on ICP-OES, belonging to the technical field of elemental content analysis methods. The analytical method includes: pretreating the tungsten-copper alloy sample with concentrated nitric acid, hydrofluoric acid, hydrogen peroxide, and boric acid to obtain an analytical solution, and simultaneously preparing a blank analytical solution; preparing a series of standard solutions using a mixed aluminum and zirconium standard solution; and sequentially measuring the mass concentrations of zirconium and aluminum in the analytical solution using ICP-OES. This invention fills the gap in current standards for Zr and Al detection in tungsten-copper alloys, providing an accurate and efficient analytical method for material development, production quality control, and performance evaluation.

This invention discloses a multi-structured coating, its preparation method, and its application. The coating comprises a TiAlN substrate, an AlTiN gradient layer with increasing Al content, an AlTiN / TiSiN nanolayer, and a TiSiN nanocomposite layer, sequentially connected. The substrate is connected to the substrate. The AlTiN gradient layer with increasing Al content is immediately connected to the TiAlN substrate. The AlTiN / TiSiN nanolayer is a nano-multilayer structure composed of alternating AlTiN and TiSiN layers. The TiSiN layer is a nanocomposite structure composed of nanocrystalline embedded amorphous substrate. The total thickness of the coating is controlled between 1.0 and 6.0 μm. The multi-structured coating exhibits a bonding strength of 65–120 N with the substrate, a nanohardness of 32–35 GPa, and a fracture toughness of 5.9–10 MPa·m. 1 / 2 It has strong toughness and corrosion resistance, and high bonding strength. Its coated tools have a cutting life that is much longer than that of traditional AlTiN coated tools.

The black composite oxide particles according to the present invention contain Fe, Mg, and Al as metal components, and satisfy 42 < = W1 < = 60, 4 < = W2 < = 11, and 4 < = W3 < = 11, where W1 wt% is the Fe content, W2 wt% is the Mg content, and W3 wt% is the Al content, and the half-value width of a diffraction peak based on a (311) plane representing a spinel structure in X-ray crystal structure analysis is 0.100-0.190 DEG (inclusive). And further contains from 5 ppm to 100 ppm (inclusive) of C1.

A sliding member may include a metallic base, at least one intermediate bonding layer disposed on the metallic base, and a multilayer protective coating disposed on the intermediate bonding layer. The at least one intermediate bonding layer may be composed of at least one metal. The multilayer protective coating may include a plurality of CrAlN layers and a plurality of Cr(Al)N layers arranged in an alternating manner. The multilayer protective coating may include a plurality of periodicity layer groups, each of which may be defined by a CrAlN layer and an adjacent Cr(Al)N layer. The plurality of CrAlN layers may have a higher Al content than the plurality of Cr(Al)N layers. A thickness ratio of the CrAlN layer to the Cr(Al)N layer in each periodicity layer group may be from 1 to 10. The multilayer protective coating may have a total Al content of 15 to 40 atom-%.

The invention provides a preparation and analysis method of a hot-dip Zn-Al-Mg alloy coating, and belongs to the technical field of metal surface coating. The preparation method comprises the steps of steel strip pretreatment, hot dipping and post-plating treatment, and an alloy plating layer with a uniform structure is obtained by controlling parameters of all working procedures; the invention also provides a matched coating analysis method which comprises the following steps: performing phase analysis by adopting an X-ray diffractometer, and performing quantitative characterization on the microscopic structure of the coating by adopting a scanning electron microscope in combination with image analysis software. The corrosion resistance of the coating is remarkably improved by increasing the content of Al and cooperatively adding Mg and Si, the microstructure characteristics of the coating are revealed through analysis, a theoretical basis is provided for component optimization and process control, and industrial application prospects are achieved.

The present invention provides a technique for improving the yield of Al with no increase in the cost of vacuum refining. In addition, a method for manufacturing steel with less variation in the amount of Al is provided. A method for deoxidizing and refining molten steel using a vacuum refining apparatus, in which an Al-containing substance is added to the molten steel in a vacuum tank, and the temperature change ΔT1 and ΔT2 of the molten steel in the Al deoxidation satisfy the following equation (1). The Al content of the Al-containing substance is preferably 30 to 80 mass%. The method for deoxidizing and refining molten steel described above as a deoxidation step enables the manufacture of steel in which the Al concentration in the steel after the deoxidation step is 0.02 mass% or less. ΔT1 + ΔT2 < 0 ··· (1) ΔT1 represents the temperature increase due to the heat of oxidation of Al, and ΔT2 represents the temperature decrease due to the sensible heat of the Al-containing substance.

The invention discloses a method for producing ultra-high clean bearing steel based on residual calcium content control, which specifically comprises the following steps: calculating the maximum value of the Al content in molten steel through a formula according to the O content and Ca content in the molten steel in an LF (ladle furnace) refining process, and then adding a proper amount of aluminum wire to enable the Al content in the molten steel to be less than or equal to the calculated maximum value of the Al content; the calculation formula is as follows: T [Al] = (2.5 * T [O]-77) * ln [(T [Ca]-0.35 T [O]) / (-0.7 T [O] + 1)]; t [Al], T [O] and T [Ca] are the maximum value of the Al content, the O content and the Ca content in the molten steel in the refining process in sequence, and the unit is ppm. By means of the method, production of the ultra-high-cleanliness high-carbon-chromium bearing steel with the T. [O] smaller than or equal to 5 ppm can be achieved, the coarse inclusion D in the bearing steel is smaller than or equal to 0.5 grade, and the coarse inclusion D in the bearing steel is smaller than or equal to 0.5 grade.

Provided is a steel material providing high strength and excellent low-temperature toughness in a component for a machine structure. The steel material according to the present disclosure has a chemical composition containing, in terms of mass%, 0.20%-0.48% of C, 0.20%-1.30% of Si, 0.80%-2.00% of Mn, 0.050% or less of P, 0.010%-0.090% of S, 0.05%-0.50% of Cr, 0.05%-0.30% of V, 0.0001%-0.0055% of Ti, 0.005%-0.050% of Al, 0.003%-0.030% of N, 0.0001%-0.0050% of Ca, and 0.0030% or less of O, with the balance being Fe and impurities, wherein: the number density ND of coarse inclusions having an equivalent circle diameter of 3.0 μm or more is 0.70 or less per 1 mm2; and the number ratio NR of coarse specific inclusions in which the Mn content, the Al content, the Ti content, and the V content in terms of mass% satisfy formula (1) among the coarse inclusions is 75% or less.　(1): (Mn + Al) / (Ti + V) < 0.30

The present invention relates to the field of detection, and in particular to a method for detecting the bonding strength of filling materials. The content includes: measuring the initial bonding strength of the filling material through a standard tensile test; preparing samples required for dynamic loading and applying dynamic loading; introducing a dynamic loading bonding strength correction algorithm, based on the vibration frequency of dynamic loading and the amplitude of dynamic loading, combined with the initial bonding strength, to obtain the cumulative normalized energy density; based on the cumulative normalized energy density, calculating the dynamic loading correction factor; based on the dynamic loading correction factor, correcting the initial bonding strength to obtain the corrected bonding strength. It solves the technical problems that traditional detection methods are mostly static tests, which cannot fully simulate actual working conditions and are difficult to reflect the true performance under dynamic working conditions; the quantification of dynamic loading damage effects is insufficient; and the consistency and reliability of test results are insufficient.

The application discloses a high-strength and high-toughness corrosion-resistant die-casting magnesium alloy suitable for large and complex thin-wall structural parts, a production process and application thereof, and belongs to the technical field of metal materials. The magnesium alloy comprises the following components in percentage by mass: 6.5-8% of Al, 0.2-0.4% of Mn, 0.05-0.15% of Ca, 0.05-0.2% of Si, 0.01-0.08% of RE, the balance of Mg and inevitable impurities, and RE is selected from Ce, La, Sm or Y. The Al content is controlled in the critical transition interval 6.5-8%, trace Ca, Si and RE elements are added, high-pressure die-casting process parameters (injection speed 4-6 m / s, casting pressure 30-80 MPa, mold temperature 150-250 DEG C, wall thickness 2-5 mm) are combined, the 'high nucleation rate + inhibition of growth' mechanism under the condition of rapid solidification is utilized, the beta-Mg17Al12 phase is distributed in the form of fine and dispersed particles instead of continuous network distribution, and the synergistic optimization of strength and plasticity is realized. The alloy has high fluidity, excellent corrosion resistance and thermal cracking resistance, and is especially suitable for large and complex thin-wall die-casting structural parts such as automobile bodies.

In the present invention, a mold powder for continuous casting that is effective in preventing operational troubles and quality deterioration caused by longitudinal cracks of slabs in continuous casting of hypo-peritectic steel is provided at low cost. The mold powder for continuous casting satisfies a basicity expressed by the mass ratio of the content of Ca in terms of CaO to the content of Si in terms of SiO2, i.e. (%CaO) / (%SiO2), of 1.30 to 1.60, an Al content in terms of Al2O3 of 0 mass% to 3.0 mass%, an Mg content in terms of MgO of 1.0 mass% to 3.0 mass%, an F content of 8.0 mass% to 12.0 mass%, an Na content in terms of Na2O of more than 5.0 mass% and 9.0 mass% or less, and an Mn content in terms of MnO of 2.0 mass% to 5.0 mass%.

The present invention provides a Pt-modified gradient NiCoCrFeAl high-entropy coating and a preparation method thereof, relating to the technical field of high-temperature oxidation-resistant coating preparation. The method first electroplates a Pt layer on the surface of a high-temperature alloy substrate to enhance the selective oxidation of Al, thereby reducing the critical Al content required to form Al2O3 on the coating surface and reducing the difficulty of forming the multi-arc ion plating target. Multi-arc ion plating is then used to prepare the NiCoCrFeAl high-entropy coating, which has a slower cooling rate than laser cladding and can reduce the coating's tendency to crack. Finally, chemical vapor deposition aluminizing is performed to increase the Al content in the coating, significantly improving the oxidation resistance of the Pt-modified gradient NiCoCrFeAl high-entropy coating sample at 1200°C.