36results about How to "Fully alloyed" patented technology

The invention relates to a preparation method for a gold-tin eutectic alloy foil having a uniform structure. The preparation method comprises: accurately preparing a gold-tin alloy raw material with a tin mass percentage of 20% and a gold mass percentage of 80%; in a non-consumable electrical arc smelting furnace, under a vacuum degree of 10<-3> Pa, repeatedly carrying out smelting, electromagnetic stirring and cooling at least three times to obtain a gold-tin alloy casting ingot; and carrying out homogenization annealing on the casting ingot, and then carrying out multi-pass thermal compression to obtain the gold-tin eutectic foil. According to the present invention, the vacuum electrical arc smelting, the circular electromagnetic stirring and the cyclic thermal compression to prepare the whole lamellar eutectic structure, wherein the eutectic point component does not have the primary phase; and compared with the preparation method in the prior art, the preparation method of the prevent invention has the following characteristics that: the complete alloying is achieved, the strength is high, the weldability is good, other components are not added or the gold-to-tin ratio is not adjusted, the welding temperature and the welding performance are stable, the welding piece deformation and the force on the welding piece are uniform, the welding piece cracking condition is not easily generated, the yield is high, the production efficiency is much higher than the production efficiency of the electroplating method for preparing the gold-tin welding piece, the production cost is reduced, and the preparation method is suitable for mass production.

The invention discloses a method for rapidly preparing a three-dimensional porous gold-silver alloy nanometer material, which comprises the following steps: adding silver nitrate and ascorbic acid into a gold nano octahedral colloidal solution and reacting for 30 minutes under the condition of 50-80 DEG C so as to prepare a gold@silver nano cubic colloidal solution; uniformly mixing the gold@silver nano cube cubic colloidal solution with deionized water under the action of stirring and irradiating with a laser with a power of 670-680 volts for 60 -90 seconds so as to prepare a gold-silver alloy nanosphere colloidal solution; adding nitric acid into the gold-silver alloy nanosphere colloidal solution and reacting for 0.5-hours to obtain the three-dimensional porous gold-silver alloy nanometer material. The method not only can rapidly prepare the three-dimensional porous gold-silver alloy nanomaterial at room temperature and greatly shorten the preparation time, but also realizes the complete alloying of gold and silver elements; the three-dimensional porous gold-silver alloy nanomaterial has uniform size, large specific surface area, and good monodispersity; the preparation processis simple and easy to operate.

The iron-based amorphous nano master alloy belongs to the field of metallurgy, and its chemical composition mass percentage is: Si is 15.7, B is 3.8, Nb is 11, Cu is 2.4, and the balance is Fe. The smelting method is: add industrial pure iron - ferroniobium - industrial silicon - electrolytic copper boron iron into the intermediate frequency smelting furnace in sequence; (2) preheat with low power first, and then heat with high power; (3) wait After the raw materials are completely melted, carry out alternating stirring with large and small power, and at the same time cooperate with the shaking furnace with medium and small range; when the temperature rises to 1400 ° C, keep it warm for 5 minutes; (4) Finally, slag and tap. The invention solves the problems of burning loss of raw materials, difficulty of melting high-melting point alloys and the like. The amorphous and nanocrystalline strips produced by using the master alloy have multiple advantages such as uniform composition, good toughness, significantly improved magnetic properties, and reduced manufacturing costs.

The invention discloses prealloyed powder for diamond sawing tools. The prealloyed powder, disclosed by the invention, comprises the following components in percentage by weight: 20-25% of Cu, 5-10% of Co, 1-3% of Ni, 3-6% of Cr, and the rest amount of Fe. As raw materials of carcasses for the diamond sawing tools, the prealloyed powder has the advantages of low oxygen content, fine granularity, uniform and segregation-free components, irregular particle morphology, difficult secondary oxidation, difficult agglomeration and full alloying; and the obtained carcasses are uniform in structure, high in hardness and impact strength, and are good in mechanical control of diamond.

A production process of silicon carbide titanium, the sponge titanium and single crystal silicon are loaded into a vacuum induction melting furnace, and the temperature is continuously raised until the sponge titanium and single crystal silicon are remelted, then the vacuum is stopped; after filling with argon, stirring and pouring Fix the mold to obtain titanium-silicon alloy ingot; process the titanium-silicon alloy ingot into titanium-silicon alloy powder; put titanium-silicon alloy powder and graphite powder into a vacuum ball mill, add binder, and ball mill and mix the materials for 24 hours under the protection of argon , use a press to press into a round cake, put it into the crucible of a vacuum resistance furnace, evacuate, heat up to 1100°C, vacuum to 25Pa, keep warm for 3.5 hours, continue to heat up to 1350°C, vacuum to 25-350Pa, keep warm, After full alloying, fill with argon, continue to heat up to 1520 ° C for 3 hours, and obtain Ti 3 SiC 2 blocks. The raw material is primary, the cost is low, no further processing is required, the temperature requirement in the whole reaction process is not high, the product purity is good, and large-scale industrial production is possible.

The invention discloses a melting method for a magnesium alloy containing high reactivity elements, comprising the steps of oil immersion, adding and stirring. The method is characterized by that: utilizing the characteristics of some mineral oil that does not react with active metals used for adding in melting magnesium alloy, such as Mg, Ca, La, Ce, Y, and Sr, putting the metals and intermediate alloys containing the metals in the mineral oil to prevent oxidation of the metals in preservation; and adding fine metals or intermediate alloys with mineral oil on the surface in the melt. Becausethe fire point of the mineral oil is low, the mineral oil burns around the surface of the alloy melt in a crucible to rapidly consume the air around the surface of the alloy melt, so that an effective isolation between the surface of the alloy melt and the ambient air is formed, the oxidation of the alloy melt at high temperature is prevented effectively, the alloying of the fine metals or intermediate alloys containing high reactivity under the condition of air insulation is fully realized, and the alloying efficiency is improved.

An SPS sintered titanium-based composite material and its preparation method, which is characterized in that it is prepared by composite sintering of Ti-6Al-4Sn-9Zr-1.21Nb-1.6Mo-0.3Si powder and nano-GNP powder; first, add absolute ethanol Fully disperse the nano-GNP powder so that the GNP powder will not agglomerate in subsequent operations, then add Ti-6Al-4Sn-9Zr-1.21Nb-1.6Mo-0.3Si powder for wet grinding, and then dry grind after drying. After the materials are sieved, a powder with uniform particles is obtained, which is dried again, and then the mixed powder is poured into a graphite mold for plasma sintering to obtain Ti‑6Al‑4Sn‑9Zr‑1.21Nb‑1.6Mo‑0.3Si powder and nano-GNP powder. Further alloying. The composite material obtained by the invention has excellent performance, and the composition uniformity and oxidation resistance of the material are greatly improved.

The invention discloses an iron-hafnium-rare earth intermediate alloy. The intermediate alloy comprises 10-30 wt% of hafnium, 50-85 wt% of iron and 5-20 wt% of rare earth metal. The invention also provides a preparation method of the intermediate alloy. The method comprises the following steps: preparing materials according to above weight percentages of above elements in the alloy, adding the iron, hafnium and rare earth metal raw materials into a crucible, and placing the crucible in a vacuum melting furnace; and performing vacuumizing until the vacuum degree in the melting furnace is -0.1 MPa or less, introducing a protective gas to maintain the vacuum degree at -0.08 to -0.06 MPa, heating the melting furnace to 1400-1500 DEG C, melting the raw materials for 15-30 min, adding the obtained alloy solution into a die, performing cooling molding, and performing demolding to obtain the iron-hafnium-rare earth intermediate alloy. The iron-hafnium-rare earth intermediate alloy prepared bythe method has uniform composition and wide applicability, and can be especially used as an additive for rare earth permanent magnet materials and high-temperature alloy steels.