110 results about "Solidus" patented technology

The invention relates to a method for preparing a semisolid blank, utilizes an improved SIMA (strain induced melt activation) method to prepare the semisolid blank, and belongs to the technical field of metal semisolid blank. The method comprises the following steps of: firstly, measuring a liquid solid phase line point of the semisolid alloy to be prepared, then, heating an alloy blank so as to carry out asynchronization multitrack rolling or pillar squeezing transformation, finally, remelting, and carrying out heat preservation for a long time so as to obtain the required semisolid blank. The asynchronization rolling or pillar squeezing transformation is capable of generating large deformation amount, group bough crystal formed in the blank is destroyed, the asynchronization rolling is utilized to replace pre-deformation processes such as the existing upset, compression, equal diameter angle compression, and the semisolid blank is prepared and has the advantages of uniform formation, high nodularity, and accurate control solid phase rate.

A solder comprising a bismuth matrix, between about 5-24% copper; and about 0.5-36% tin or antimony or zinc; having a solidus temperature of ≧271° C., a reflow temperature of ≦375° C., and at least one intermetallic composition precipitate comprising copper and at least one of tin, antimony and zinc substantially excluding bismuth formed within the solidus phase.

A method for the production of foamable or foamed metal pellets, parts and panels. The method comprises the steps of: i) providing a mixture of a metal alloy powder with a foaming agent powder, ii) pre-compacting the mixture of step i); iii) heating the pre-compacted mixture of step ii) to a temperature below a decomposition temperature of the foaming and at which permanent bonding of the particles occurs v) hot compacting the body for producing a compacted body made of a metal matrix embedding the foaming agent; and vi) reducing the compacted body into metal fragments and thereby obtaining dense foamable metal chips. A method for the production of a foam metal using a closed volume metal shell is also disclosed. The method comprises the steps of: a) providing metal pieces and reducing said metal pieces into smaller metal particles; b) mixing the metal particles with an additive having a decomposition temperature that is greater than a solidus temperature of said metal particles; c) pouring the mixture of step b) into a closed volume metal shell having a given thickness and providing the metal shell with at least one passage for gases to escape; d) reducing the thickness of the metal shell by applying pressure; e) heating the metal shell to a temperature above said solidus temperature of the metal particles and below said decomposition temperature of the additive, and immediately applying pressure on the metal shell sufficient to compress the metal particles and to create micro shear conditions between the metal particles so as to obtain a dense metal product.

The invention provides an alloy contained in a high melting point and lead-free solder. The alloy consists of 2wt% - 5wt% of Sb and 98wt% - 95wt% of Bi, the solidus temperature of the alloy is not lower than 270 DEG C, while the liquidus temperature of the alloy is not higher than 310 DEG C. As the Bi-Sb alloy belongs to an ultimate mutual soluble alloy, the solidus point and the liquidus point of the alloy increase with the increase of Sb content. Compared with the conventional Pb-10Sn solder, the high-melting point and lead-free solder is more environmentally friendly. The alloy can be further added with a proper amount of silver when the solder is made into a welding collar in order to improve the weldability of the solder.

Provided is a precision casting method for thin-wall high-temperature alloy floating wall tiles. The precision casting method comprises the steps that firstly, a mold shell is processed and then subjected to heating and heat preserving; secondly, after alloy is heated and melted into alloy liquid, the alloy liquid is poured into the mold shell; and finally, after the mold shell is removed out of a heat preserving furnace, nitrogen is filled to increase the cooling rate, and thus casting of the K4169 high-temperature alloy floating wall tiles is completed. According to the precision casting method for the thin-wall high-temperature alloy floating wall tiles, the heat preserving temperature of the mold shell is increased to the temperature which is 10 DEGC-40 DEG C higher than a solid phase line to improve the mold-filling capacity of alloy melt, so that forming of a casting is ensured, the pouring system size is decreased, and the yield of the casting is increased; the alloy liquid is poured into the mold shell at the temperature which is 10 DEGC-32 DEG C higher than a liquid phase line, the temperature gradient of the solidification front of the melt is decreased, isometric crystals are formed, and casting deformation is relieved; after mold filling is completed, the casting is removed out of the heat preserving furnace to be cooled, protective atmosphere is simultaneously filled to promote heat transfer, the cooling efficiency is improved, refining of grain structures is achieved, and the casting performance is improved.

A method and apparatus for thixotropic molding of semisolid alloys are disclosed. The method comprises of feeding a dendritic-free feedstock bar into an extruder barrel, melting a terminal portion of the feedstock bar into a semisolid slurry by heating it to a temperature between its solidus and liquidus temperatures, and using the solid portion of the feedstock bar as an one-time 'plunger' to inject the semisolid slurry into a mold cavity. The apparatus based on the present method, which is equipped without a regular extruder screw or plunger, uses a feedstock bar as a one-time plunger to inject semisolid slurries formed from a terminal portion of the same feedstock bar.

A powder metallurgy process for the manufacture of powders of a refractory ceramic material, comprising the consecutive steps of:

• • (i) obtaining a dry mixture of a hafnium dioxide HfO₂ powder and an yttrium oxide Y₂O₃ powder;
  • (ii) step of granulation by pelletization of the dry mixture under stirring in order to obtain a granulated mixture, this granulation step comprising the spraying, into the dry mixture, of an aqueous solution comprising polyvinyl alcohol (PVA) and polyethylene glycol (PEG);
  • (iii) drying of the granulated mixture;
  • (iv) filling of a mold with said granulated mixture;
  • (v) isostatical or semi-isostatical pressing of the granulated mixture in order to obtain a compact mixture;
  • (vi) sintering of the compact mixture in order to obtain a refractory ceramic material at a solidus temperature in the range between 2500° C. and 2800° C.

A titanium dioxide flux-cored wire is provided that can acquire a welding metal having high-temperature crack resistance equivalent to or above that of solid core wire, and can obtain the welding metal with high welding processibility (all-attitude welding). The welding metal welded by the titanium dioxide flux-cored wire has more than 0.029% of content of C on the basis of mass percent of total mass of the welding metal, and respectively sets contents of B, C, Mn, N, P, S, Si and Ti as [B], [C], [Mn], [N], [P], [S], [Si], [Ti], temperature of solidus Ts defined by the following formula is above 1355 DEG C, so as to contain the ingredients hereinbefore. Ts = 1538-8903*[B]-982*[C]-6.64*[Mn]-511*[N]-368*[P]-3603*[S]-47.0*[Si]-205*[Ti]-17.

The invention discloses a method for producing cylindrical or tubular bimetallic parts. A circular bar or tube is put on a loading tray, and the loading tray rotates and meanwhile moves down so as todrive the bar or the tube to rotate and move down. The surface of the bar or the tube forms an additional material layer through a jet nozzle by a precise metal jet forming process, the solidus temperature of the additional material layer is A, and the part with the temperature A being +/-8%A DEG C of the additional material layer is radially knocked by knocking equipment. Thus, the space betweenthe knocking equipment and the jet nozzle in the vertical direction can be greatly shortened. The part, approaching the solidus temperature, of the additional material layer is knocked, the resistanceto metal deformation is small, and the additional material layer is enough to be densified by less beat force and the tissue structure of the additional material layer is improved. Secondary heatingis avoided, the production efficiency is high, and energy conservation and environment protection are realized. The invention further provides equipment for implementing the production method. The method is used for additional material processing of the bar or the tube.

An apparatus is provided for storing hazardous waste material, which includes one or more of spent nuclear fuel, radioactive material, and fissionable material. A fusible alloy material, for example, a eutectic material, resides within the apparatus and surrounds the hazardous waste material. In the preferred embodiments, it is suggested that the fusible alloy material exhibits liquidus and solidus or melting temperatures that are between about 100 and 300 degrees Fahrenheit for facilities using the apparatus and methods for liquid storage pool loading applications. For facilities using the apparatus and methods for dry loading, the fusible alloy materials may exhibit liquidus and solidus or melting temperatures that are between about 100 and 650 degrees Fahrenheit. The fusible alloy material is introduced in a liquid phase and eventually solidifies into a solid phase as the temperature of the hazardous waste material and/or the local environment decreases.

The invention discloses a hubbed flange production process capable of improving production efficiency, and belongs to the technical field of flange production. According to the technical scheme, the hubbed flange production process is characterized by comprising the following steps that S1, cutting is conducted, specifically, a blank is cut from round steel; S2, heating is conducted, specifically,the blank is heated in a heating furnace to enable the temperature of the blank to be higher than a recrystallization temperature and lower than a temperature of a solidus; S3, free forging is conducted, specifically, the heated blank is upset through a press machine, and then the blank is punched through a punch; S4, ring rolling is conducted, specifically, the blank is installed on a ring rolling machine to be subjected to ring rolling, axial pressure is applied to the edge, close to an outer circle, of the end face side wall of the blank while ring rolling is conducted, and a flange neck is formed on the end face side wall of the blank; S5, annealing is conducted, specifically, the blank is placed in a resistance furnace to be annealed; and S6, turning is conducted, specifically, the flange is turned through a lathe. The hubbed flange production process has the effect of improving the production efficiency.

The invention discloses a low-temperature lead-free solder paste and a preparation method thereof. The low-temperature lead-free solder paste is prepared from the following raw materials according tomass percent: 86% to 91% of low-temperature tin-bismuth-silver-copper quaternary lead-free solder powder and 9% to 14% of scaling powder, wherein the low-temperature tin-bismuth-silver-copper quaternary lead-free solder powder is composed of four elements including tin, bismuth, silver and copper, the mass percent of bismuth is 46% to 52%, the mass percent of copper is 0.3% to 1.2% of copper, themass percent of silver is 0.4% to 1.2%, and the mass percent of tin is 45.6% to 53.3%. The solder paste is prepared by adopting the formula and the method, the bismuth content is in a relatively highreasonable range, so that the solidus temperature of the product is increased from 138 DEG C to 151 DEG C, the solder paste is suitable for a low-temperature packaging process, the welding peak temperature does not exceed 200 DEG C, and compared with Sn42Bi58 alloy, the tensile strength, the shear strength, the anti-dropping performance and the thermal cycle life of the product are greatly increased.

The invention relates to the technical field of metal grain refinement, and discloses a method for supergravity refining of a metal solidification structure. The method comprises the steps that cooling solidification is conducted on a metal melt in a supergravity field, wherein the cooling solidification speed is the constant speed or the non-constant speed, the metal cooling speed ranges from 1 DEG C/min-10 DEG C/min, the supergravity field is achieved through rotation centrifuging of equipment, the gravity coefficient of the supergravity field is 1-800, and in the other words, the supergravity acceleration is 1g-800 g; and when the temperature of the metal melt is reduced to a liquid phase line, supergravity treatment is started, and when the temperature of the metal melt is reduced to the position lower than a solid phase line by 50 DEG C, supergravity treatment is stopped. The method has the beneficial effects that the moving gathering of a primary dendritic crystal, especially the rapid moving gathering of fine crystal nucleuses in the earlier stage of solidification in the supergravity field is greatly enhanced, and the metal solidification structure is rapidly and effectively refined; other elements are not guided in, and the purity degree of metal is guaranteed; and the technology process is simple, cost is low, environment friendliness is achieved, and the application prospect is wide.

The invention relates to a low-melting-point and high-strength low-silver cadmium-free manganese-free multi-element silver solder and a preparation method thereof. The multi-element silver solder is composed of 19%-23% of silver, 32%-35% of zinc, 1.0%-3.0% of tin, 0-2.0% of nickel, 0-3.0% of indium, 0.01%-1.0% of alloying elements and the balance of copper, wherein the alloying elements are one ormore of phosphorus, lanthanum and cerium; and the alloying elements are composed of the following components in percentage by mass: 0.2%-1% of phosphorus, 0-0.02% of lanthanum and 0-0.01% of cerium.The preparation method of the multi-element silver solder comprises the following steps: S1, heating copper in Cu-X alloy in a medium-frequency smelting furnace crucible to be completely molten, and then adding alloy metal X till the Cu-X alloy is completely molten; S2, adding silver, zinc, tin, nickel and indium with the purity being at least 99.99% and the remaining part of the Cu-X alloy from which copper is removed into the medium-frequency smelting furnace crucible containing the molten Cu-X alloy to be smelted and cast according to the component proportion of the low-silver cadmium-freemanganese-free multi-element silver solder; and S3, carrying out subsequent treatment. The silver solder is easy to prepare, the total content of cadmium, manganese, silver and indium is low, the solid phase line temperature, the liquid phase line temperature and the welding performance are proper, and the machinable performance is high.

The invention relates to a method for calculating the thickness of a slab shell at the position of a continuous casting roller row and the solidification tail end of a casting machine. The method is characterized by comprising the following steps: according to a rule that zero plasticity temperature is approximately equal to solidus temperature, acquiring the thickness of the slab shell at the position of a pulling-straightening roller by searching point-shaped cracks on a low magnification of a continuous casting slab and measuring the distance from the cracks to the edge part of the casting slab; and according to the measured thickness of the slab shell at the position of a roller farthest from the meniscus, the position of a corresponding roller row and a pulling speed, further reckoning the comprehensive solidification coefficient and the liquid phase cavity length of the casting machine through secondary application of a solidification law square root formula, so that the effect of nail shooting or solidification model calculation is achieved. The invention discloses the method which does not need a model, does not need nail shooting and deduces the thickness of the slab shell and the solidification tail end by researching the low power of the continuous casting slab, and the method can optimize tail end electromagnetic stirring, soft reduction tool arrangement and a production process, so that the segregation problem of the continuous casting billet and a rolled material is solved.

A method of bonding superalloys is provided. The method includes: aligning a first superalloy subcomponent having a gamma-prime solvus g′₁ and a second superalloy subcomponent having a gamma-prime solvus g′₂, with a filler material that includes at least 1.5 wt % boron disposed between the first and second superalloy subcomponents; performing a first heat treatment at a temperature T₁, where T₁ is above the solidus of the filler material and below the liquidus of the filler material; and performing a second heat treatment at a temperature T₂, where T₂ is greater than T₁, and where T₂ is greater than or equal to the lower of g′₁ and g′₂.

The invention mainly discloses a heat treatment method of a Hastelloy casting. The method comprises the steps of: 1, setting a furnace temperature: according to the chemical components of the Hastelloy casting, heating a heat treatment casting to reach a temperature between a solid phase line and a liquid phase line of the Hastelloy casting, and carrying out heat preservation; 2, heating and preserving the temperature: placing the Hastelloy casting into a high-temperature furnace for heating, discharging automatically and obliquely by adopting a trolley, adding a body temperature-measuring thermocouple in the high-temperature furnace for detecting the temperature of a casting body, comparing with an air thermocouple, and ensuring that a temperature curve is consistent with a program set curve; and 3, water-cooling: when the casting reaches the preset heat preservation time, discharging at a temperature of 1150-1175 DEG C, and rapidly placing the casting in water of below 10 DEG C for cooling, thereby obtaining high-strength corrosion resistance. According to the invention, heat deformation and heat cracks in a heat treatment process are reduced, and the Hastelloy casting with highstrength and high flexibility is obtained.

Disclosed is a copper phosphorus brazing alloy with hafnium zirconium cobalt, and belongs to the technical field of soldering material of metal materials. The chemical ingredients includes, by weight: 5.0% to 8.0% of P, 4.5% to 10.0% of Sn, 0.05% to 0.35% of Co, 0.01% to 0.2% of Hf, 0.01% to 0.2% of Zr, and the balance being Cu. The adding proportion of the Hf element and the Zr element is Hf : Zr =1:1. According to the copper phosphorus brazing alloy, obtained according to the above proportion with the hafnium zirconium cobalt, the solidus line temperature ranges from 575 to 595 DEG C, and the liquidus line temperature ranges from 635 to 655 DEG C (measuring errors are considered both). The copper phosphorus brazing alloy with the hafnium zirconium cobalt has the advantages of 'high phosphorus, high tin, high plasticity and low melting point', the copper phosphorus brazing alloy can be processed into fine wires with the diameter of 0.5 to 1.2mm, and the requirements of soldering when HPb62-3 lead brass and HPb59-3 lead brass are adopted to produce products in the household appliance industry and the hardware industry can be met.

The invention discloses a laser surface zirconium infiltration method for improving the surface hardness and wear resistance of a titanium alloy. The method comprises the following steps of firstly, preliminarily optimizing a laser 3D printing process window; calculating a molten pool three-dimensional temperature field under preliminary optimization parameters by using a finite element heat transfer model to obtain a molten pool fixed-point temperature change curve; separately extracting the peak temperature Tmax of the molten pool temperature curve and the average value t of the sum of intercepts of the temperature curve, a liquidus and a solidus, and calculating an average cooling rate xi of the molten pool in the cooling stage; optimizing the process parameters according to the principles that Tmax is greater than or equal to 1.45 Tm and less than or equal to 1.7 Tm, t is greater than or equal to 250ms and less than or equal to 450ms, and xi is greater than or equal to 3.5 * 103 DEG C/s and less than or equal to 2.8 * 104 DEG C/s so as to obtain an optimized process window; and according to the optimized process parameters, carrying out the laser surface zirconium infiltrationtreatment to obtain a dense and high-metallurgical-quality surface zirconium infiltration modified layer. According to the method, the surface hardness and wear resistance of the titanium alloy can beeffectively improved.

The invention discloses magnesium-based amorphous alloy solder used for magnesium alloy brazing and a preparation method for the magnesium-based amorphous alloy solder. The structural formula of the amorphous alloy solder is Mg66Cu15Ag5Zn4Dy1GdxNd9-x. According to the preparation method, Mg, Cd, Nd, Ni and Zn are mixed in a graphite crucible according to the needed element composition proportion, melted under the protection of argon and poured into a copper die, and then the Mg-Cu-Ag-Zn-Dy-Nd amorphous alloy solder is obtained. The magnesium-based amorphous alloy solder is suitable for magnesium alloy brazing at the solidus temperature of more than 400 DEG C, and has the characteristics of being low in melting point and high in strength. When the heat-resistant magnesium alloy solder is used for Gw103K magnesium alloy brazing, the room temperature shear strength of a brazing overlap joint is 128-136 MPa. The preparation method is simple, easy to operate, good in component control, small in impurity content and suitable for preparing high-quality magnesium-based amorphous alloy solder.