84 results about "Mn alloy" patented technology

The invention discloses a cold-crack-resistant welding wire for thick-specification ultrahigh-strength steel and a welding method of the cold-crack-resistant welding wire, and belongs to the technical field of welding, a low-cost alloy system with Mn as a leading part and Cr as an auxiliary part is constructed, Mn is used for reducing the Ms point, the hardenability of Cr is improved, and the Ms point of weld metal is regulated and controlled to be in a low-temperature phase change interval of 100-150 DEG C; in the welding process, the inter-pass temperature is controlled to be higher than the Ms point all the time, all layers of welding beads are kept in the austenite state in the filling process, all the welding beads are uniformly cooled, low-temperature martensite phase transformation is synchronously generated, the situation that phase transformation of the welding beads which are firstly welded too early occurs, and consequently pressure stress relaxation is caused is avoided, and part of retained austenite is reserved is avoided. By means of the characteristics of a medium Mn alloy system, the common cold crack risk in thick plate high-restraint welding is effectively avoided, it is ensured that weld metal has the ultrahigh strength, meanwhile, the alloy cost is remarkably reduced, and therefore the technical bottleneck of thick ultrahigh-strength steel in the low-cost and efficient welding application aspect is broken through.

The invention discloses a high-performance Al-Mn alloy composite material and a preparation method thereof, and belongs to the technical field of metal material preparation. The material is of a surface layer-core part-surface layer continuous gradient structure, and the surface layer is prepared from 3.5% of Mn, 0.5%-1.0% of Cu, 0.8%-1.0% of Mg, 0.3%-0.8% of Zn, 0.2%-0.3% of Sc, 0.1%-0.2% of Cr, 0.4%-0.6% of TiO2 reinforcement and the balance Al and impurities; and the core part comprises the following components: 0.1 to 0.2 percent of Zr, 0.05 to 0.1 percent of Si, 0.4 to 0.6 percent of Al2O3 reinforcement and the balance of Al and impurities. The preparation method comprises the steps of mechanical powder mixing, gradient cold press molding, hot isostatic pressing densification, homogenization treatment, hot extrusion, annealing treatment and solid solution-two-stage aging treatment. Through gradient component design and a multi-process synergistic process, the strength, toughness and corrosion resistance of the material are synergistically improved, and the material is particularly suitable for power battery shells and other high-performance light-weight structural parts.

This invention relates to the field of alloy technology improvement and provides a method for preparing aluminum-magnesium alloy welding wire, comprising: S1, adding a mixture of metallic magnesium, aluminum, aluminum-manganese alloy, and aluminum-chromium alloy to a melting furnace for heating and melting; S2, subjecting the molten mixture to grain refinement and refining treatment in the melting furnace; S3, casting and rolling the refined aluminum alloy melt to obtain an aluminum alloy wire rod; S4, subjecting the aluminum alloy wire rod to scraping, precision drawing, and precision scraping to generate an aluminum alloy welding wire that meets the required parameter standards. The aluminum alloy welding wire prepared by this method shortens the workshop production line, simplifies production equipment, reduces the cost of preparing aluminum alloy welding wire, improves production efficiency, reduces raw material consumption, and simultaneously possesses high mechanical properties, making it highly practical.

The application relates to the field of damping alloy, and particularly discloses an iron-manganese damping alloy with high damping performance at low strain amplitude and a preparation method thereof. The preparation method comprises the following steps: establishing an iron-manganese alloy lattice structure model by using a three-dimensional modeling software; performing slice processing on the iron-manganese alloy lattice structure model; taking iron-manganese powder as a matrix material, and preparing an iron-manganese alloy lattice structure by using a selective laser melting additive manufacturing process; and performing heat treatment on the iron-manganese alloy lattice structure, wherein the heat treatment comprises solid solution treatment and aging treatment performed in sequence. By means of the additive manufacturing and heat treatment processes, the iron-manganese damping alloy with high strength and damping performance is prepared, and the alternating strain is amplified through the lattice structure, so that the iron-manganese damping alloy also has excellent damping performance at low strain amplitude. The damping performance tan phi of the iron-manganese alloy at a strain amplitude of 2*10 ‑4 -4 can reach 0.047, which helps to expand the application prospect of the iron-manganese alloy in the micro-vibration sensitive field.

The application discloses a kind of high-damping Fe-Mn series alloy materials, the component of alloy and the mass fraction of each component are as follows: Mn 16.5-17.5%, doping metal 0.5-0.8%, TiB2 0.02-0.03%, C0.01-0.015%, Si 0.015-0.02%, Fe remainder.The high-damping Fe-Mn series alloy material provided by the application, by optimizing the composition of alloy material and improving the process, using the method of combination of forging, stage solid solution and stage aging, the Fe-Mn series alloy material prepared has the comprehensive performance of high damping, high strength and good toughness;Add specific ratio of Ni, Zr, Mo doping metal and a small amount of TiB2, wherein, Ni improves the stacking fault energy, stabilizes austenite and solid solution strengthening, Zr and Mo form intermetallic compound to carry out precipitation strengthening and refine grain, TiB2 promotes grain refinement, C and Si affect the strength, plasticity and processing performance of alloy, synergistic effect of each element, the balance of high damping, high strength and good low-temperature toughness of Fe-Mn series alloy is realized.

The invention relates to a method for preparing a copper-aluminum-manganese composite material, in particular to a method for preparing an aluminum oxide particle reinforced copper-aluminum-manganese composite material through combination of laser powder bed melting and in-situ reaction. The invention aims to solve the problem of insufficient hyperelasticity of the existing copper-aluminum-manganese alloy and the problem that a fine-crystalline pure austenite structure cannot be prepared in the sintering preparation process of the traditional aluminum oxide reinforced copper alloy. The method comprises the following steps: 1, preparing CuAlMn and Cu2O composite powder; 2, carrying out vacuum sealing and in-situ reaction at high temperature; and 3, laser printing forming. The method is used for preparing the aluminum oxide particle reinforced copper-aluminum-manganese composite material through combination of laser powder bed melting and in-situ reaction.

Provided is an Fe-Mn alloy having a low magnetic susceptibility and excellent workability. The Fe-Mn alloy includes, by mass, more than 30.0% but not more than 35.0% manganese (Mn), 1.0% to 8.0% aluminum (Al), 0.5% to 1.5% carbon (C), 5.0% to 10.0% chromium (Cr), and 2.5% to 5.0% nickel (Ni) in terms of composition, the remainder being iron (Fe). As a crystal structure, the Fe-Mn alloy has a γ-Fe phase or a β-Mn phase, and the sum of the area fractions of the γ-Fe and β-Mn phases is 50% or more.

The invention relates to the technical field of aluminum alloy heat treatment, in particular to a homogenizing heat treatment process and system for an aluminum alloy battery shell for a new energy automobile. The process comprises the following steps: obtaining an Al-Mn alloy cast-rolled coiled material, and carrying out acid pickling treatment on the Al-Mn alloy cast-rolled coiled material; the Al-Mn alloy cast-rolled coiled material is cleaned; the Al-Mn alloy cast-rolled coiled material is placed in a high-temperature annealing furnace to be subjected to homogenizing heat treatment, and the temperature in the furnace is monitored in real time; after the annealing furnace is cooled, sampling is conducted on the Al-Mn alloy cast-rolled coiled material, and performance detection is conducted on a sample; the system comprises a pretreatment module, a cleaning module, a heat treatment module and a detection and evaluation module. Through homogenizing annealing treatment, composition segregation generated in the casting and rolling process of the Al-Mn alloy cast-rolled coiled material can be effectively eliminated, so that the structure is more uniform and fine, the deep drawability and mechanical property of the material are stable, the defects of cracking and wrinkling are avoided, and the quality and reliability of the battery shell are improved.

This disclosure relates to a semiconductor device and a method for manufacturing the same. The semiconductor device includes: an interlayer insulating film disposed on a substrate and having a recessed portion of the substrate exposed; a bottom electrode contact embedded in at least a portion of the recessed portion; a magnetic tunnel junction (MTJ) layer disposed on the interlayer insulating film and the bottom electrode contact; and a offset cancellation layer with a magnetization direction parallel to the antiparallel side of a fixed layer, wherein the offset cancellation layer may include a Co alloy, Fe alloy, Ni alloy, or Mn alloy comprising at least one selected from the group consisting of Al, Ga, B, Ir, Zr, Hf, and rare earth metals, or a ternary or quaternary Co alloy, Fe alloy, or Ni alloy comprising one selected from the group consisting of Pt or Pd and at least one selected from the group consisting of Cr, Al, Tb, Si, and B.

This invention belongs to the field of aluminum-based composite material preparation technology, specifically a high-strength and high-toughness aluminum-based composite material based on additive manufacturing technology and its preparation method. The composite material of this invention comprises a matrix material and a reinforcing phase. The matrix material is Al-0.1%Mg-0.6%Si-1.0%Cu-0.5%Mn alloy powder, and the reinforcing phase consists of ZnO powder and pure Cu powder. This invention uses an Al-0.1Mg-0.6Si-1.0Cu-0.5Mn alloy as the matrix and ZnO and Cu particles as the reinforcing phase, utilizing selective laser remelting (SLM) technology to form a novel, high-strength and high-toughness aluminum-based composite material. During the printing process, by performing two laser scans on each layer of metal powder, metallurgical bonding between the reinforcing particles and the matrix is ​​achieved, while simultaneously reducing the material's porosity, refining the grain structure, and significantly improving its mechanical properties.

The utility model discloses a novel toothed roll crusher, including first toothed roll and second toothed roll, the center distance between first toothed roll and second toothed roll is greater than the sum of the radius of first toothed roll and second toothed roll, and less than the sum of the radius of first toothed roll, the radius of second toothed roll and half finished product maximum particle size size, thereby reduce the time and times of extrusion of material in the cavity formed between first toothed roll or second toothed roll, realize the purpose of reducing powder particle, after the technical improvement of above -mentioned structure, the powder particle rate of the silicon manganese alloy of crushing is close to artificial crushing, and the total crushing cost of every ton is less than artificial crushing 10 yuan or so, can replace artificial crushing completely, and can produce 200 million economic benefits for enterprise every 200 million tons output, has good popularization effect.

The utility model provides a dust removal and purification system for producing silicon-manganese alloy. The dust removal and purification system for producing the silicon-manganese alloy comprises a box body and a filter box fixedly mounted on one side of the box body, the inclined plate is fixedly arranged in the box body and is used for guiding smoke dust; the upper half part of an inner cavity of the box body is separated by the inclined plate to form a snake-shaped cavity; the group of drainage pipes are respectively arranged on the top of the inner wall of the box body and the inclined plate and are used for capturing dust particles in the smoke dust; the partition plate is fixedly mounted in the filter box and is used for partitioning the interior of the filter box into two filter cavities; the two groups of filter screens are respectively arranged in the two filter cavities in a sliding manner and are used for filtering dust; the two air inlets are formed in one side of the box body and are respectively communicated with the two filtering cavities. The dust removal and purification system for producing the silicon-manganese alloy has the advantage that the used filter screen can be taken out for cleaning operation under the condition that the box body is not stopped.

The invention relates to low-cost 460MPa-grade normalized pressure vessel steel and a preparation method thereof, belongs to the technical field of energy storage equipment, and solves the problems of low strength, high cost and complex preparation process of the existing pressure vessel steel. The pressure vessel steel comprises the following chemical components in percentage by weight: 0.12 to 0.18 percent of C, 1.2 to 1.7 percent of Mn, 0.2 to 0.4 percent of Si, 0.03 to 0.12 percent of V, 0.01 to 0.03 percent of N, 0.02 to 0.06 percent of Ti, less than or equal to 0.001 percent of Als, less than or equal to 0.002 percent of S, less than or equal to 0.01 percent of P and the balance of Fe. Compared with the prior art, the pressure vessel steel does not contain the element Ni, part of the element V is replaced with the element Ti, and the raw material cost is reduced; the content ratio of Ti to N is controlled to be lower than 3.42, so that a nanoscale Ti (C, N) strengthening phase is separated out in the preparation process of the steel; the Si-Mn alloy deoxidizer is used, so that the introduction of Al is reduced, and the precipitation of AlN is inhibited to enhance the plasticity and toughness of the steel; nitrided ferrovanadium is used for replacing ferrovanadium to directly introduce an N element, so that the technological process is reduced, and the cost is saved.

The invention discloses a high-speed extrudable magnesium alloy and a preparation method thereof, and relates to the technical field of magnesium alloy materials, the high-speed extrudable magnesium alloy comprises the following magnesium alloy components in percentage by weight: 0.8-1.2% of Ca, 0.4-0.8% of Mn and the balance of Mg and inevitable impurities, the content of impurity elements is less than or equal to 0.1%, and the preparation method comprises the following steps: step 1, preparing raw materials; step 2, alloy smelting and casting molding; step 3, alloy blank homogenization treatment; according to the high-speed extrusion magnesium alloy and the preparation method thereof, the defects that in the prior art, the magnesium alloy is low in extrusion speed, insufficient in yield strength or too high in cost are overcome, the magnesium alloy capable of being extruded at the high speed and the preparation method of the magnesium alloy are provided, by precisely regulating and controlling the component range and preparation process parameters of the Mg-Ca-Mn alloy, the alloy can be extruded at the high speed of 60 m / min, and the yield strength of the alloy is greatly improved. The yield strength reaches 200 MPa or above, meanwhile, good plasticity and formability are considered, expensive elements such as rare earth do not need to be added, the material cost is reduced, and the requirement for industrial large-scale production is met.

We provide highly aesthetically pleasing spandrels, spandrel panels, and buildings. [Solution] The spandrel comprises a metal substrate containing an Al-Mn alloy and a design layer laminated on the metal substrate, with the thickness of the metal substrate being 0.3 mm or more and 2.0 mm or less.

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.

A ribbon of elastocaloric material is provided. The ribbon is made from copper alloyed with aluminum and manganese. The ribbon has a length, a width, and a thickness. The length is a longest dimension of the ribbon, and the width is perpendicular to the length. The thickness is perpendicular to both the length and the width, and the thickness is 0.1 mm or less. Further, in a room temperature ambient environment, the ribbon increases in temperature by at least 4° C. upon application of 6% of tensile strain and cools by at least 4° C. when the tensile strain is unloaded.

This invention relates to the field of aluminum alloy materials and their processing and preparation, specifically to a bulk nanostructured high-strength and corrosion-resistant Al-Mg-Mn aluminum alloy, its preparation method, and its applications. By weight percentage, the Al-Mg-Mn alloy comprises: Mg 4.0–6.5%, Mn 0.1–1.5%, with the remainder being Al. The bulk aluminum alloy is obtained through a process of smelting, casting, homogenization treatment, hot forging, solution treatment, multi-pass cold rolling, and annealing, exhibiting a nanostructure and high strength and corrosion resistance. The bulk nanostructure grain boundaries of this invention are mainly composed of low-energy, small-angle grain boundaries. These small-angle grain boundaries can improve the strength and plasticity of the material and significantly inhibit the precipitation of active phases during sensitization, giving the aluminum alloy a high strength-plasticity balance and excellent resistance to intergranular corrosion and stress corrosion. This makes it suitable for the preparation of high-strength, large-size structural components used in chloride-containing corrosion environments.

The application provides a high-strength Ti-TiB2 composite particle reinforced Mg-Zn-Al-Mn alloy and a preparation method, and belongs to the field of high-performance magnesium alloy materials. The preparation method comprises the following steps: Ti powder and TiB2 powder are fully mixed to obtain a mixture; under a protective atmosphere, pure magnesium ingots, pure zinc ingots, pure aluminum ingots and Mg-10Mn intermediate alloy are melted, then the preheated mixture is added, and then mechanical stirring, ultrasonic stirring, refining, slag removal, casting, homogenization and hot extrusion treatment are performed to obtain the high-strength Ti-TiB2 composite particle reinforced Mg-Zn-Al-Mn alloy. The high-strength Ti-TiB2 composite particle reinforced Mg-Zn-Al-Mn alloy finally obtained has the following performances: the yield strength is greater than or equal to 230 MPa, the tensile strength is greater than or equal to 290 MPa, and the elongation is greater than or equal to 13.5 %. The alloy prepared by the process has excellent strength and plasticity, the process flow is simple, the cost is low, and the process is suitable for industrialized production.

The invention relates to an Al-Mn alloy for a power lithium ion battery case and a preparation method of the Al-Mn alloy, the Al-Mn alloy comprises the following components in percentage by mass: 0.9-1.2% of Mn, 0.2-0.4% of Fe, 0.1-0.25% of Si, 0.2-0.28% of Cu, 0.15-0.28% of Mg, 0.005-0.015% of Ti, 0.08-0.14% of Cr and the balance of Al and other inevitable impurities, and the conditions that the content of Mg and Cu is less than or equal to 0.5%, and the content of Fe / Si is greater than or equal to 1.3 are also required to be simultaneously met; 7.8 < = Mn / Cr < = 12; 3.1 < = (Mg + Cu) / Cr < = 4.7; when Mg + Cu is larger than or equal to 0.4% and smaller than or equal to 0.5%, Mn is 0.9-1.1%, generation of fine compounds is promoted, formation of coarse compounds is prevented, the number of precipitated compounds with the size larger than 9 micrometers in the microstructure of the Al-Mn alloy is controlled to be smaller than or equal to 100 / mm < 2 >, and the number of precipitated compounds with the size larger than 5 micrometers on the surface of the Al-Mn alloy is controlled to be smaller than or equal to 500 / mm < 2 >. Compared with a 3003-H14 alloy, the alloy obtained through the method has considerable strength, higher ductility and good stamping and laser welding performance, and the thinning manufacturing requirement of the battery shell can be met.

This invention relates to the field of welding materials technology, specifically to a universal ultra-hard iron-based tungsten carbide flux-cored alloy welding wire for laser welding and surfacing, and its preparation process. The wire comprises a steel strip sheath and flux-cored powder. The flux-cored powder contains the following components by weight percentage: tungsten carbide particles: 35%-50%; niobium powder: 0.3%-1%; titanium powder: 1.0%-3.0%; chromium powder: 9%-15%; cobalt powder: 2%-4%; silicon-manganese alloy powder: 1.0%-2.0%; zirconium powder: 0.1%-0.3%; aluminum-magnesium alloy powder: 0.5%-1.5%; fluoride: 2.0%-4.0%; the balance being iron powder. The flux-cored powder accounts for 35%-55% of the total weight of the welding wire. This invention introduces multi-component composite carbide forming elements and optimizes their ratio to achieve synergistic strengthening and grain refinement of the microstructure of the weld overlay, thereby achieving the technical effect of significantly improving the toughness and crack resistance of the weld overlay while obtaining ultra-high hardness.

The invention relates to an iron-manganese alloy, comprising in weight percentage: 25.0% = Mn = 32.0%, 7.0% <Cr < 14.0%, 0 = Ni = 2.5%, 0.05% = N = 0.30%, 0.1 = Si = 0.5%, opcionalmente 0.010% = tierras raras = 0.14%. El resto que es hierro y elementos residuales resultantes de la producción.

The invention discloses a die-casting aluminum-magnesium-manganese alloy capable of being anodized and a preparation method thereof, belongs to the technical field of aluminum alloy materials, and solves the problems that a silicon element in a traditional die-casting alloy such as an aluminum-silicon series cast aluminum alloy affects the anodizing appearance, welding defects are easily caused, and the service life of the die-casting alloy is prolonged. The traditional aluminum-manganese alloy is easy to stick to a die and is not suitable for die casting, and the mechanical property of the traditional aluminum-manganese alloy is difficult to meet the requirements of medium-high strength. The die-casting aluminum-magnesium-manganese alloy capable of being anodized comprises the following components in percentage by mass: 2%-3.5% of Mg, 2.0%-3.0% of Mn, 0.1%-0.3% of Cu, 0.2%-1.2% of Ti, 0.15%-0.25% of Cr and the balance of Al and inevitable impurities. The total amount of the impurities is less than or equal to 0.5%. By optimizing the components and the preparation process, the prepared aluminum-magnesium-manganese alloy has excellent mechanical properties while the appearance quality is guaranteed, the two key indexes of the excellent mechanical properties and the appearance quality are considered, and the aluminum-magnesium-manganese alloy can be widely applied to appearance part scenes with high-quality anodic oxidation requirements.

The invention specifically discloses a preparation method of a foamy copper-manganese alloy, which comprises the following steps: S100, selecting a foam base material, and electroplating copper on the foam base material to obtain foamy copper; s200, the foam base material on the foamy copper is removed; and S300, manganese is electroplated on the foamy copper with the foam base material removed, alloying treatment is conducted, and the foamy copper-manganese alloy is obtained. According to the method, the foam base material is firstly plated with copper, then the foam base material is removed, the foam copper with the foam base material removed is plated with manganese, alloying treatment is conducted, and then the final foam copper-manganese alloy is obtained, so that the technical problem that in the prior art, codeposition cannot be achieved due to the fact that the potential difference of the copper-manganese alloy is too large is effectively solved; and the manganese content in the foamy copper-manganese alloy prepared by the preparation method is controllable and adjustable.

This invention discloses a Mo-Mn biodegradable molybdenum alloy, its preparation method, and its applications. The alloying elements include Mo and Mn, with Mn accounting for >0-30% by mass, and the remainder being Mo. Manganese-doped molybdenum powder is prepared by wet chemical methods or mechanical alloying. The manganese-doped molybdenum powder is then subjected to hot pressing sintering or multi-step spark plasma sintering to obtain the Mo-Mn alloy. The Mo-Mn biodegradable molybdenum alloy of this invention possesses excellent mechanical properties, providing long-term effective mechanical support in vivo, and exhibits good cell compatibility, blood compatibility, and tissue / organ compatibility, making it suitable for use as a biomedical implant.

An Al-Mn alloy for a power lithium-ion battery casing and a preparation method therefor. The Al-Mn alloy comprises the following components in percentage by mass: 0.9-1.2% of Mn, 0.2-0.4% of Fe, 0.1-0.25% of Si, 0.2-0.28% of Cu, 0.15-0.28% of Mg, 0.005-0.015% of Ti, and 0.08-0.14% of Cr, with the balance comprising Al and other inevitable impurities. Moreover, it is further required that the components satisfy the following conditions: Mg+Cu≤0.5%, and Fe / Si≥1.3; 7.8≤Mn / Cr≤12; 3.1≤(Mg+Cu) / Cr≤4.7; and when 0.4%≤Mg+Cu≤0.5%, Mn is 0.9-1.1%, the generation of fine compounds is promoted, the formation of coarse compounds is prevented, the number of precipitated compounds having a size greater than 9 μm in the microstructure of the Al-Mn alloy is controlled to be less than or equal to 100 pcs / mm2, and the number of precipitated compounds having a size greater than 5 μm on the surface of the Al-Mn alloy is less than or equal to 500 pcs / mm2. Compared with the 3003-H14 alloy, the alloy obtained in the present invention has comparable strength, higher elongation, and good stamping and laser welding performance, and can meet the manufacturing requirements of battery casings for thinning.

The application discloses a preparation method of manganese-containing beta-gamma-TiAl alloy and the manganese-containing beta-gamma-TiAl alloy and belongs to the technical field of the manganese-containing beta-gamma-TiAl alloy. The manganese-containing beta-gamma-TiAl alloy is prepared by introducing trace Hf elements for alloying, the problem that the lamellar structure of the manganese-containing beta-gamma-TiAl alloy will occur alpha2 to beta o (nail-shaped) transformation and beta o phase plastic deformation under high-temperature long-term exposure is overcome, the stability of high-temperature service performance and the creep resistance of the alloy are improved, and the manganese-containing beta-gamma-TiAl alloy exhibits better stability and anti-creep performance under high-temperature conditions, reliable service is realized under high temperature, and the engineering application prospect of the manganese-containing beta-gamma-TiAl alloy in the field of aviation and aerospace is effectively promoted.

The invention provides a metal machining mold with a composite coating and a preparation method and application of the metal machining mold. The metal processing mold comprises an ultra-pure graphite mold and a composite coating coated on the inner surface of the ultra-pure graphite mold. The composite coating comprises a bottom layer, a first transition layer, a middle layer, a second transition layer and a surface layer which are sequentially stacked in the direction from the inner surface of the ultra-pure graphite mold to the center of the mold, the first transition layer and the second transition layer respectively and independently comprise at least three SiC-BN layers which are continuously arranged. By arranging the composite coating on the inner surface of the ultra-pure graphite mold, the mold can be prevented from being corroded, and the service life of the mold is further prolonged; and surface shrinkage cavities of the cast ingot obtained in the copper-manganese alloy machining process are reduced, and the yield of the produced copper-manganese alloy cast ingot is increased.

The invention provides a four-layer brazing aluminum composite material and a preparation method thereof, and belongs to the technical field of aluminum-based materials. The composite material sequentially comprises the following components from bottom to top: a brazing layer which comprises an aluminum alloy containing 9.3-9.8% of Si, 0.02-0.04% of Sr and 0.05-0.1% of Bi; the gradient barrier layer is made of Al-Mn-Cu alloy with components distributed in a gradient mode, the Si content of the side close to the core material ranges from 0.8% to 1.0%, the Si content of the side close to the brazing ranges from 0.3% to 0.5%, and the gradient barrier layer comprises 0.01% to 0.02% of Ce; the core material is an Al-Mg-Si alloy which comprises the following components in percentage by weight: 0.8 to 1.2 percent of Mg, 0.4 to 0.8 percent of Si, 0.08 to 0.12 percent of Zr and 0.04 to 0.06 percent of Cr; and the anti-corrosion layer comprises an Al-Mn alloy containing 0.8%-1.0% of Mn and 0.05%-0.1% of Ti. The corrosion-resistant brazing filler metal has good brazing performance, tensile strength and corrosion resistance.

The invention relates to the technical field of welding materials, in particular to a universal superhard iron-based tungsten carbide flux-cored alloy welding wire for laser and surfacing and a preparation process thereof.The universal superhard iron-based tungsten carbide flux-cored alloy welding wire is composed of a steel strip skin and flux-cored powder, and the flux-cored powder comprises, by weight, 35-50% of tungsten carbide particles, 20-30% of tungsten carbide particles, 5-10% of tungsten carbide particles, 5-10% of tungsten carbide particles and the balance iron powder. 0.3%-1% of niobium powder; 1.0%-3.0% of titanium powder; 9%-15% of chromium powder; 2%-4% of cobalt powder; 1.0%-2.0% of silicon manganese alloy powder; 0.1%-0.3% of zirconium powder; 0.5%-1.5% of aluminum magnesium alloy powder; 2.0% to 4.0% of fluoride; the balance is iron powder; and the flux core powder accounts for 35-55% of the total weight of the welding wire. By introducing multi-component composite carbide forming elements and optimizing the proportion of the multi-component composite carbide forming elements, synergistic strengthening and grain refinement of a microscopic structure of a surfacing layer are completed, and therefore the technical effect that the toughness and crack resistance of the surfacing layer are remarkably improved while the ultrahigh hardness is obtained is achieved.