198 results about "Liquidus" patented technology

The invention discloses a semi-solid injection-molded high-strength corrosion-resistant magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 7%-8.5% of Al, 1%-4% of Zn, 0.1%-0.8% of RE, 0.02%-0.5% of Ca and the balance of Mg and inevitable impurities. Through component design and process optimization, the liquidus temperature of the alloy is lower than 610 DEG C, and the alloy is insensitive to temperature in the solid fraction interval of 20-40% and is suitable for semi-solid injection molding; the Al content is controlled to form a net-shaped Mg17Al12 phase as a corrosion barrier, and Zn and RE / Ca cooperate to achieve heat treatment strengthening and oxidation film densification. The problem that strength and corrosion resistance of a traditional magnesium alloy are difficult to consider at the same time is solved, and the magnesium alloy is suitable for high-performance light-weight components of automobiles, aerospace and the like.

The invention relates to an aluminum-based composite material, in particular to a preparation method of an in-situ micro-nano Al2O3 particle reinforced aluminum-based composite material. The preparation method comprises the following steps: carrying out ball-milling pre-dispersion on silica powder, calcined kaolin and aluminum powder according to a specified ratio, stirring an Al-Si alloy melt at a semi-solid temperature, adding ball-milling mixed powder, heating to a temperature above an Al-Si alloy liquidus, dispersing reactant powder by using a blade-tray integrated stirring device, heating, carrying out heat preservation, carrying out heat preservation, and carrying out vacuum drying to obtain the aluminum-silicon alloy. And reacting to generate in-situ micro-nano Al2O3 particles, cooling, supplementing alloy elements, refining, and pouring to obtain the in-situ micro-nano Al2O3 particle reinforced composite material. According to the blade-tray integrated stirring device, mechanical stirring and the rolling and impacting effects of the ceramic balls are combined, the problem of one-time dispersion of micro-nano reactant powder is effectively solved, meanwhile, passivation of edges and corners of micron particles is achieved, and the comprehensive performance of in-situ particle reinforced aluminum matrix composites is improved.

The invention discloses a layered structure metal composite material based on a liquid phase separation phenomenon and a preparation method thereof, and the preparation method comprises the following steps: step 1, weighing raw materials which comprise at least two kinds of metal which is difficult to mix and melt; 2, the temperature of the metal material in the step 1 is increased to be above the liquidus of the metal material, and a mixture with uniform components is obtained; (3) cooling the mixture smelted in the step (2) to a liquid-phase non-mixed-melting temperature interval until the mixture is completely separated; and 4, the required metal composite material with the layered structure can be obtained after cooling. According to the invention, a method of continuous liquid phase separation and melt solidification along with a furnace is adopted, and the preparation of the layered composite material is realized by regulating and controlling alloy elements and process parameters; the preparation method is easy to operate, low in cost and high in efficiency, a metallurgical bonding interface can be obtained, and the problem that the bonding strength of a dissimilar material composite interface is low is solved.

The invention belongs to the technical field of electrode material preparation, and particularly relates to a preparation method of boric acid-assisted low-temperature sintered porous aluminum foil. The preparation method comprises the following steps: dispersing aluminum powder, boric acid and binder raw materials in a solvent to form dispersed slurry; and coating a matrix with the dispersed slurry, drying, sintering at 450-600 DEG C under protective gas, reacting boric acid with aluminum oxide on the surface of the aluminum powder to form low-melting-point aluminoborate, reducing the sintering temperature, promoting aluminum atom diffusion, increasing sintering neck formation, and sintering to obtain the porous aluminum foil. Boron oxide generated by decomposition of boric acid is added to react with aluminum oxide to form low-melting-point aluminoborate, the sintering liquidus temperature is reduced, aluminum atom diffusion is promoted, and low-temperature sintering at 450-600 DEG C is achieved. The aluminum powder sintered foil is suitable for energy storage devices such as an aluminum electrolytic capacitor and a lithium ion battery, has the advantages of low-temperature energy conservation, high porosity and strong mechanical property, and solves the problems of aluminum oxide obstruction and high high-temperature energy consumption of the traditional aluminum powder sintered foil.

The invention discloses a dispersion distribution method for a micro-nano multi-scale mixed SiC particle reinforced phase in an aluminum-based composite material and the composite material, and relates to the technical field of metal-based composite material preparation. The method comprises the following steps: firstly, carrying out ultrasonic cleaning, ultrasonication and two-stage high-temperature oxidation treatment on SiC particles, and generating an oxidation film on the surfaces of the particles; ball-milling and mixing the treated micron and nano SiC particles and micron pure magnesium particles according to a specific proportion, and pressing into a precast block; then preparing an aluminum alloy melt, cooling to a solid-liquid two-phase region, carrying out semi-solid stirring, and adding the preheated precast block; and finally, raising the temperature to be above a liquidus, rewarming, stirring and molding by casting. Through the synergistic effect of ultrasonic physical dispersion, high-temperature oxidation surface modification and magnesium-induced semi-solid stirring, the problems that micro-nano particles are prone to agglomeration, wettability is poor and interface reaction is difficult to control are effectively solved, multi-scale uniform dispersion distribution of a reinforced phase in an aluminum matrix is achieved, and the comprehensive performance of the composite material is remarkably improved.

The invention discloses a semi-solid plastic forming method for 6xxx aluminum alloy, and belongs to the technical field of semi-solid forming. The method comprises the steps that an original aluminum alloy ingot is smelted to obtain liquid aluminum alloy, and pouring is started to prepare semi-solid slurry when the temperature is 20-50 DEG C higher than a liquidus; transferring the semi-solid slurry into a preheated mold on an extruder for extrusion casting to obtain a semi-solid cylindrical blank; and the semi-solid blank is preheated and subjected to heat preservation, the preheated semi-solid blank is transferred into a preheated extrusion container, aluminum alloy profile extrusion is conducted, and finally the high-strength and high-plasticity aluminum alloy profile is obtained. According to the semi-solid rheological squeeze casting technology, grains and a second phase are refined, a semi-solid cast ingot which is more uniform in structure and better in compactness is obtained, and follow-up profile extrusion of the semi-solid cast ingot is facilitated; and finally, the aluminum alloy profile with higher compactness and better mechanical property is obtained through profile extrusion.

The invention discloses a technological method for regulating and controlling the melting point and viscosity of aluminum deoxidized steel refining slag based on rare earth cerium, and belongs to the technical field of ferrous metallurgy refining. The redox characteristic of Ce and slag system structure modification are combined, the limitation of traditional single component adjustment is broken through, and the composite oxide effect of Ce is utilized: Ce generates CeO2 and Ce-Al-O composite oxide at high temperature, so that the liquidus temperature of a slag system is remarkably reduced, and the melt structure is optimized; by limiting the addition amount of Ce and balancing the cost and performance, the situation that the oxidability of a slag system is out of control due to excessive Ce is avoided, and the thermodynamic stability of the slag system is improved; the addition of Ce inhibits the generation of high-melting-point calcium aluminate and promotes the formation of a low-melting-point phase; by adding Ce, melting point reduction, viscosity optimization and molten steel purification are achieved at the same time, the additive is superior to an existing single-function additive, traditional fluorite is replaced, and fluorine pollution is reduced. The invention aims to provide the same environment-friendly and efficient method capable of accurately regulating and controlling the physicochemical properties of the slag.

The invention discloses titanium-rare earth synergistic alkali-free glass with an ultrahigh strain point and high resistance and a preparation method of the alkali-free glass, and belongs to the technical field of glass. According to the alkali-free glass, a unique titanium-rare earth synergistic enhanced network is constructed, two key control parameters, namely, a high temperature performance index (HTPI) and a resistance synergistic factor (RCF), are defined for the first time, and when the HTPI is controlled to be 5.8-7.2 and the RCF is controlled to be 3.5-4.85, the strain point of the glass is larger than or equal to 745 DEG C, and meanwhile, the glass has the advantages that the glass has the good heat resistance and heat resistance; according to the glass substrate prepared by the preparation method disclosed by the invention, the resistivity at 1620 DEG C can be accurately regulated and controlled within an ideal interval of 50-150 omega.m, meanwhile, the Young modulus is greater than or equal to 88 GPa, the liquidus temperature is less than or equal to 1260 DEG C, the comprehensive performance is far better than that of the prior art, and the strict requirements of high-generation LTPS and IGZO display panel manufacturing on the glass substrate are perfectly met.

The invention discloses a two-stage aging heat treatment process for optimizing medium-temperature brittleness of a precipitation strengthening type high-temperature alloy, and belongs to the technical field of heat treatment of heat-resistant materials. The two-stage aging heat treatment process for improving the medium-temperature brittleness of the precipitation strengthening type high-temperature alloy comprises the following steps: heating the precipitation strengthening type high-temperature alloy to 120-220 DEG C below the liquidus temperature of the alloy, and carrying out solution treatment, then carrying out primary aging treatment in a manner of cooling to 100-350 DEG C below the dissolution line temperature of a precipitation phase at the cooling rate of 0.25-8 DEG C / min, and then cooling to obtain an alloy intermediate; and the alloy intermediate is heated to 150-350 DEG C below the precipitation phase dissolution line temperature, secondary aging treatment is carried out, then cooling is carried out, and the precipitation strengthening type high-temperature alloy with the medium-temperature brittleness improved is obtained. According to the two-stage aging heat treatment process, the problems of premature failure and fracture and insufficient plasticity of the alloy in the medium-temperature tensile deformation process are inhibited, and the percentage elongation after fracture of the alloy in the medium-temperature tensile deformation process is effectively improved.

The present invention belongs to the technical field of metal material preparation, and particularly relates to a niobium-containing stainless steel and a preparation method thereof. The preparation method of the niobium-containing stainless steel comprises the following steps: Smelting: Smelting the raw materials of the niobium-containing stainless steel in a vacuum induction melting furnace to obtain molten steel. During the fine adjustment of the steel composition in the smelting process, Nb is added all at once together with ferro-niobium and the alloy finally used for composition adjustment and supplementation; Pouring: When the temperature of the molten steel is 40 - 120 °C higher than the liquidus temperature, tapping and pouring into electrode bars; Vacuum consumable melting: Subjecting the electrode bars to vacuum consumable melting to obtain ingots; Forging: Forging the ingots to obtain finished products. The low-magnification structure of the niobium-containing stainless steel prepared by this preparation method eliminates the irregular local coarse-grained condition, the high-magnification structure is uniform, and at the same time, it has stable impact work.

The present invention provides an alkali-free glass sheet, which has a content of Li2O+Na2O+K2O of from 0 mol % to 0.5 mol % in a glass composition, and has a Young's modulus of 78 GPa or more, a strain point of 680° C. or more, and a liquidus temperature of 1,450° C. or less.

The invention belongs to the field of material microstructure research and analysis, and particularly relates to an in-situ solidification observation experiment and analysis method for nickel-based superalloy. Aiming at the defect that the dynamic evolution behavior of the structure of the nickel-based superalloy in the solidification process is difficult to continuously, clearly and quantitatively treat, the method comprises the following steps: performing laser heating on an alloy sample to be above liquidus temperature at a set cooling rate of a high-temperature laser confocal scanning microscope, and guiding the alloy sample to be stably solidified in a microscopic view range; dynamic tracking of the whole process from melting, nucleation to complete solidification is achieved, continuous evolution images of microstructures are obtained in real time, image data are subjected to quantitative analysis in combination with Image J, Image Pro Plus, Origin and other software, alloy solidification behavior characteristics and the response relation between the alloy solidification behavior characteristics and set process parameters are judged according to analysis results, and the alloy solidification behavior characteristics can be determined according to the analysis results. Therefore, quantitative evaluation of the solidification process promotion or inhibition effect under different process parameter conditions is realized.

The present invention discloses a colored glass-ceramics, a preparation method thereof and an application. The colored glass-ceramics, in the form of oxides and by mass percentage, includes: a base component and a coloring component. The base component includes SiO2: 67% - 73%, R2O: 10% - 19%, Al2O3: 2% - 8%, B2O3: 0 - 0.5%, SnO2: 0 - 0.2%, ZrO2: 1.5% - 5%, RO: 0 - 3%, P2O5: 1.5% - 3.5%; the coloring component includes at least one of oxides of transition metals or rare earth elements, with a mass percentage of 0.02% - 6%; wherein, R2O is an alkali metal oxide; RO is an alkaline earth metal oxide. By adding a coloring component to the glass composition, the colored glass-ceramics presents the required color. By adjusting the proportion of each component, a glass melt with a low liquidus viscosity is obtained, and its forming temperature can be between 1060 - 1250°C, and the kinematic viscosity is 21000mm 2 / s - 57500mm 2 / s, which is applicable to the fusion leakage forming of platinum pipes or platinum forming devices.

The application discloses a near-liquid line extrusion casting forming equipment, which comprises a support, a mold closing mechanism, a driving mechanism and a screw feeding mechanism arranged on the support, wherein the screw feeding mechanism is provided with a driving cylinder on the side away from the connection with the mold closing mechanism, and the driving cylinder is provided with an adjusting mechanism capable of controlling the gas flow and the gas pressure; the adjusting mechanism increases the gas flow to realize high-speed pre-feeding of the feeding screw rod to inject the melt into the mold closing mechanism in the injection stage when the melt does not fill the mold closing mechanism, or reduces the gas flow and increases the gas pressure to realize slight pre-feeding of the feeding screw rod to compensate the melt shrinkage by pressure in the pressure maintaining stage when the melt fills the mold closing mechanism; the adjusting mechanism is controlled by a control system, and the control system is used to automatically switch the working state of the adjusting mechanism in the injection stage or the pressure maintaining stage. The application has the beneficial effects of realizing high-quality, high-efficiency and high-stability production of the near-liquid line extrusion casting.

The application relates to the technical field of brazing, and discloses a Zr-Ti-Hf-Ni-Cu-Co six-element medium-entropy alloy brazing filler metal for pure titanium and titanium alloy brazing and a use method. The Zr-Ti-Hf-Ni-Cu-Co six-element medium-entropy alloy brazing filler metal provided by the application has the following weight percentage of components: Ti: 9.5-13.9; Ni: 5.5-9.5; Cu: 5.0-9.5; Co: 2.0-8.5; Hf: 0.0-2.0; and Zr: the balance. The application has the following technical effects: the liquidus temperature of the brazing filler metal is between 769 DEG C and 782 DEG C, the brazing filler metal is easy to be shaped into an amorphous brazing filler metal alloy, and the shear strength of a pure titanium-titanium alloy joint obtained by brazing at a temperature of 810 DEG C-828 DEG C for 10 minutes reaches 243-280 MPa.

This invention discloses a method, apparatus, and storage medium for optimizing the formulation of erosion-resistant concrete. The method includes establishing a mechanism model of molten material erosion of concrete; selecting multiple concrete components based on the molten material erosion mechanism model; composing concrete with different formulations based on the multiple concrete components; calculating the equilibrium temperature and liquidus temperature of the mixture composed of the concrete and the molten material when thermal equilibrium is reached during the interaction between the molten material and the concrete with different formulations; and determining the optimal formulation of the concrete based on the equilibrium temperature and liquidus temperature of the mixture. Concrete prepared using this invention exhibits a significantly lower erosion rate than ordinary nuclear power plant concrete, thus improving the nuclear power plant's ability to respond to severe accidents.

This invention proposes a method for preparing cement clinker based on fluorite, belonging to the field of cement production technology. Through steps such as fluorite raw material pretreatment and particle size classification, co-grinding of fluorite and raw meal, dynamic adjustment of fluorite admixture, clinker firing, and rapid cooling to obtain the finished product, fluorite is uniformly dispersed in the raw meal system, stably exerting its mineralization effect. This can reduce the liquidus appearance temperature by 50-80℃, reduce the clinker sintering temperature by 50-100℃, significantly promote the formation and development of core strength minerals such as C3S, shorten the clinker firing time, and improve the production efficiency of the kiln system.

The invention belongs to the technical field of glass manufacturing and detection, and discloses yttrium-containing aluminosilicate glass with low liquidus temperature, a preparation method and a glass cover plate, the glass comprises SiO2, Al2O3, B2O3, Li2O, Na2O, MgO, P2O5, ZnO, TiO2, SnO2, Sb2O3, La2O3 and Y2O3, and the yttrium-containing aluminosilicate glass is obtained through melting treatment, coarse annealing and devitrification sample preparation. The glass has the elasticity modulus higher than 80 GPa and the transmittance higher than 90%, the liquidus temperature is effectively reduced by adjusting the proportion of part of materials, forming is promoted, the production requirements of a production line are met, and the prepared glass can be applied to the field of mobile phone cover plates and vehicle-mounted glass and has wide application prospects. And theoretical basis and reference value are provided for research and production of yttrium-containing aluminosilicate glass.

The invention relates to a method for pulling a single crystal from a melt consisting of silicon and a dopant according to the Czochralski method, comprising the following steps in a given sequence: a) performing a time-dependent computer simulation of a predetermined crystal pulling process having a predetermined dopant concentration (C) in the melt, with the aim of obtaining a temperature gradient and a dopant gradient for each time increment t, wherein the two gradients are determined at the interface between the crystal and the melt in the normal direction of the melt interface, b) determining a maximum dopant concentration (Cmax) in the melt, and c) pulling up a single crystal having a dopant concentration less than the determined maximum dopant concentration (Cmax), characterized in that a parameter (CS) is calculated for each time increment t, which is determined by formula, wherein the parameter fCS is determined from the product of the average concentration (C) of the dopant in the melt, the density of the silicon melt, the Avgamde constant, the molar mass of the silicon and the slope of the liquidus, and then generating an average value of the values obtained for the parameter (CS) wherein only those values having the (CS) value less than zero are included, and determining the maximum dopant concentration (Cmax) by adapting the above defined dopant concentration (C) until the magnitude equals zero.

A fusible link element (10; 15; 25; 35) comprising a metal composite material in which a first fusible metal (11; 21; 31) and a second fusible metal (12; 22; 32) are layered on top of each other, wherein the second fusible metal (12; 22; 32) has a lower melting temperature than the first fusible metal (11; 21; 31), characterized by the fact that the first fusible metal (11; 21; 31) is a Sn-Ag alloy and the Sn-Ag alloy contains at least 20 wt% and at most 30 wt% Ag, and the second fusible metal (12; 22; 32) is a Sn-Bi alloy and the Sn-Bi alloy contains at least 40 wt% and at most 70 wt% Bi, wherein at a common working temperature at least part of a component of the second fusible metal (12; 22; 32) is melted and part of a component of the first fusible metal (11; 21; 31) is melted, and where, at the common working temperature, the difference between a liquidus temperature and a solidus temperature of the first fusible metal (11; 21; 31) and the second fusible metal (12; 22; 32) is reduced by a shift in the equilibrium of Sn between the first fusible metal (11; 21; 31) and the second fusible metal (12; 22; 32) and by a mutual diffusion of Ag and Bi between the first fusible metal (11; 21; 31) and the second fusible metal (12; 22; 32).

The application discloses a continuous crystallization purification method of high-purity aluminum, which comprises the following steps: S1, pouring an aluminum-containing liquid into a crystallization crucible and controlling the temperature of the aluminum-containing liquid to be above the liquidus of the aluminum liquid; S2, slowly inserting a crystallization shaft into the aluminum-containing liquid; S3, introducing a protective gas into the crystallization crucible, stirring the aluminum-containing liquid, rotating the crystallization shaft, introducing a cooling gas into the crystallization shaft, starting crystallization, and obtaining a crystallization ingot; and S4, after the crystallization is completed, taking out the crystallization ingot from the crystallization crucible with the crystallization shaft, melting, and casting into an ingot to obtain high-purity aluminum. The method has high production efficiency, high controllability and good stability, and is especially suitable for continuous batch production.

This invention discloses a lightweight, high-strength Ni-Co-based single-crystal high-entropy alloy and its preparation method. The chemical composition of this single-crystal high-entropy alloy includes eight elements: Ni, Co, Cr, Al, Ti, Mo, W, and Hf. The atomic percentages of each element are: Ni 45-55 at%, Co 15-20 at%, Cr 9-12 at%, Al 9-12 at%, Ti 4-8 at%, Mo 1-2 at%, W 0-1 at%, and Hf 0-0.1 at%. The preparation method includes the following steps: obtaining the liquidus temperature through simulation calculation and the eutectic dissolution temperature through melting point testing; sequentially placing the elemental elements Ni, Co, Cr, Ti, Mo, and W into a crucible in a vacuum induction melting furnace and casting them into a master alloy ingot; and preparing a grain with a specific orientation using the Bridgeman high-speed solidification method and the seed crystal method. <001> A single-crystal high-entropy alloy test rod was prepared; the single-crystal high-entropy alloy test rod was subjected to solution treatment, first-stage aging, and second-stage aging in sequence to obtain a lightweight, high-strength Ni-Co-based single-crystal high-entropy alloy. The single-crystal high-entropy alloy prepared by this invention has a low density and excellent room-temperature and high-temperature mechanical properties.

The invention discloses a high-strength high-temperature-resistant brazed die-casting aluminum alloy and a preparation method and application thereof, and belongs to the technical field of aluminum alloy materials. According to the high-strength high-temperature-resistant brazed die-casting aluminum alloy provided by the invention, the proportion of a eutectic phase to a primary crystal phase is controlled by controlling the proportion of Fe, Ni, Mn and RE, so that the strength of the alloy is regulated and controlled. The high-strength high-temperature-resistant brazed die-casting aluminum alloy can form good metallurgical bonding with Al-Si series brazing filler metal, the brazing filler metal and base metal are welded well, pores and cracks on the bonding surface are few, and the brazing filler metal has excellent wettability on the base metal. The high-strength high-temperature-resistant brazed die-casting aluminum alloy has the advantages of being high in solid / liquid phase line, high in strength, good in forming performance and the like, a casting is not melted or deformed after being brazed at high temperature, and the high-strength requirements of thermal management systems such as runner plates, liquid cooling plates and refrigerant branch plates in the market can be met.

To provide a protection element in which a fusible conductor is not fused even through a reflow process, and the fusible conductor can be fused quickly when abnormal.SOLUTION: A protection element 1 includes an insulating substrate 2, a heating element 5, a first electrode 3 and a second electrode 4 laminated on the insulating substrate 2, a heating element extraction electrode 6 provided on a current path between the first and second electrodes 3 and 4 and electrically connected to the heating element 5, and a fusible conductor 7 mounted on the first electrode 3, the second electrode 4, and the heating element extraction electrode 6 and fused by a self-heating caused by heating or overcurrent of the heating element 5 to block the current path. The fusible conductor 7 is formed of a laminated body 13 including at least a low melting point metal layer 11 having a liquidus temperature of less than 260°C and a high melting point metal layer 10 having a liquidus temperature of more than 400°C, and the laminated body 13 has a material configuration in which a liquidus temperature of an alloy composition when melted as a single alloy is 300°C or more and 400°C or less.SELECTED DRAWING: Figure 1

The invention relates to the technical field of brazing, and provides Zr-Ti-Hf-Ni-Cu-Co medium-entropy alloy brazing filler metal used for pure titanium and titanium alloy brazing and a using method of the Zr-Ti-Hf-Ni-Cu-Co medium-entropy alloy brazing filler metal. The invention provides Zr-Ti-Hf-Ni-Cu-Co medium-entropy alloy brazing filler metal. The brazing filler metal comprises the following components in percentage by weight: 9.5-13.9% of Ti, 0.5-1.5% of Hf, 0.5-1.5% of Ni, 0.5-1.5% of Cu and the balance of Zr. Ni: 5.5 to 9.5%; 5.0 to 9.5 percent of Cu; 2.0 to 8.5 parts of Co; 0 to 0.6% of Hf; zr: the balance. The brazing filler metal has the following technical effects that the liquidus temperature of the brazing filler metal ranges from 769 DEG C to 782 DEG C, the brazing filler metal is easily formed into amorphous brazing filler metal alloy, and the shear strength of a pure titanium-titanium alloy connector obtained after heat preservation is conducted for 10 minutes at the brazing temperature of 810 DEG C to 828 DEG C reaches 243 MPa to 280 MPa.

The invention discloses a magnesium-silicon-aluminum submersed nozzle lining material which comprises the following components in percentage by mass: 88%-98% of a base material, 1-10% of an additive; 0.5%-3% of a melting point regulator; the matrix material comprises MgO-SiO2-Al2O3 ternary components which are distributed in a range limited by a connecting line of four specific points A, B, C and D of a MgO-SiO2-Al2O3 ternary phase diagram and two liquidus lines at 1600 DEG C and 1700 DEG C; the method can be applied to continuous casting submersed nozzles, can also be applied to the high-temperature-resistant industry fields such as anti-blocking of steel ladle long nozzles adopting aluminum deoxidized steel and anti-nodulation of tundish stopper rods, and solves the problem that the submersed nozzles are easy to nodulate and block in the pouring process of aluminum deoxidized steel such as automobile sheets at present; the volume density of the magnesium-silicon-aluminum submersed nozzle lining material is 2.65-2.80 g / cm < 3 >, the apparent porosity is 10-15%, and the thermal shock resistance is gt; and 10 times (1100 DEG C-water cooling) are carried out, and the number of continuous casting furnaces in the actual use process is 8-15 times.

A method of manufacturing a metal member, being capable of manufacturing a metal member including not only a second but also a third component. A metal material consisting of a compound, alloy, or a non-equilibrium alloy and having the second and third components, the second component being mutually insoluble with a first, the third component being mutually soluble with the first and second components. A metal bath having the first and third components, controlled at a temperature lower than the lowest value of liquidus-line temperatures within a compositional variation range from the composition of the metal material to a composition in which the third component in the metal material is decreased to reach an equilibrium with the bath. The metal member having the second composition and the third component is obtained by immersing the metal material into the bath to selectively elute the third component contained therein into the bath.

The application belongs to the technical field of aluminum smelting, and specifically provides a method for detecting initial crystallization temperature of electrolyte, which comprises the following steps: preparing electrolyte powder from electrolyte to be detected, melting the electrolyte powder to obtain liquid electrolyte; gradually reducing the temperature of the liquid electrolyte, and measuring the viscosity of the liquid electrolyte to obtain the viscosity value of the current temperature every time the temperature is reduced by a preset temperature; drawing a viscosity curve of the liquid electrolyte based on the viscosity values of various temperatures, wherein the viscosity curve is used to represent the relationship between the viscosity of the liquid electrolyte and the temperature; and determining the initial crystallization temperature of the electrolyte to be detected based on the viscosity curve. The technical scheme provided by the application can improve the accuracy of the detection of the initial crystallization temperature of the electrolyte.

A cadmium-free, low-silver solder is characterized by its composition, by mass percentage, of 4.0% to 5.0% Ag, 40.0% to 45.0% Zn, 11.0% to 13.0% Sn, 0.5% to 1.5% In, 0.5% to 1.5% Ga, 0.5% to 1.5% Ni, 0.01% to 0.05% nano-CeO2, 0.01% to 0.05% nano-Y2O3, and the balance being Cu. Silver plates, cathode copper, zinc ingots, tin ingots, metallic indium, metallic gallium, and metallic nickel are added in the appropriate proportions and smelted using a medium-frequency smelting process. Before casting, trace amounts of nano-CeO2 and nano-Y2O3 powders are added, thoroughly stirred, and then cast into an ingot. The desired solder wire is then obtained through extrusion and drawing. The solder has a solidus temperature of ≤735°C and a liquidus temperature of ≤780°C. When used with the commercially available FB102 flux, the brazing performance of the brazing filler metal is close to that of the commercially available BAg25CuZn filler metal. When brazing copper-stainless steel, copper-brass, brass-stainless steel, and Q235 steel-stainless steel, the shear strength of the brazed joints is superior to that of the commercially available BAg25CuZn filler metal.

The invention discloses a preparation method of a rare earth-containing AlMgSi alloy based on pulse electromagnetic solidification and the AlMgSi alloy, relates to the technical field of metal metallurgy, and aims to solve the technical problems that the AlMgSi alloy prepared by the prior art is poor in precipitated phase distribution uniformity and low in alloy structure refinement rate, so that the AlMgSi alloy cannot meet the use requirements of high performance and high homogenization. The preparation method of the rare earth-containing AlMgSi alloy based on pulse electromagnetic solidification comprises the following steps: preparing metal raw materials according to the composition and weight percentage of the AlMgSi alloy; after metal raw materials of the AlMgSi alloy are smelted into molten aluminum, pulsed magnetic field treatment is carried out on the molten aluminum above a liquidus of the molten aluminum, and the AlMgSi alloy is obtained after cooling; in the pulsed magnetic field treatment process, the molten aluminum is controlled to contain 0.1 wt% of lanthanum-cerium mixed rare earth, and the mass ratio of lanthanum to cerium in the lanthanum-cerium mixed rare earth is 1: (0.5-2).