The present invention discloses a cold additive and hot forging combined forming method of amorphous alloy parts. The present invention belongs to the field of cold additive manufacturing technology and thermoplastic forming of amorphous alloy, and more particularly relates to a cold additive and hot forging combined forming method of amorphous alloy parts, the method comprising: (1) making amorphous alloy powder into a pre-forging blank by the micro-jetting and bonding 3D printing technology; and (2) placing the pre-forging blank in the step (1) in a closed forging die to perform hot closed-die forging so as to obtain an amorphous alloy part, wherein the contour size and shape of the pre-forging blank are designed according to the contour size and shape of the inner cavity of the closed forging die; and an exhaust hole is provided in the closed forging die such that gas generated by gasification or decomposition of the binder at a hot die forging temperature is discharged through the exhaust hole in the closed forging die. In the present invention, a bulk amorphous alloy part with a large size and a complex shape can be prepared by the cold additive and hot forging combined forming method.

Embodiments disclosed herein relate to the production of bulk amorphous metal (BAM) alloys comprising chromium, manganese, molybdenum, tungsten, silicon, carbon, boron, and the balance of iron to replace tungsten carbide-based welded material. The BAM alloy embodied herein can be applied through PTA welding, HVOF, TWAS, flame spraying, plasma spraying, laser, their combinations, and other coating and welding processes. When used as welded material, the density of the embodiment of around 7 grams per CC, which is less dense than the tungsten carbide customarily used, resulting in even hard faces during welding spread uniformly across the weld, therefore creating a harder and more wear-resistant weld.

A method for manufacturing a three-dimensional shaped object by laminating a layer to manufacture the three-dimensional shaped object, the method including a layer forming step of forming the layer using a constituent material containing amorphous metal powder and a melting and solidifying step of irradiating the layer with a laser to melt and solidify the amorphous metal powder, in which in the melting and solidifying step, a melted and solidified portion obtained by melting and solidifying the amorphous metal powder by being irradiated with the laser is formed and irradiation of the laser is repeated so that at least one-half of a width of the melted and solidified portion overlaps, thereby allowing the layer to become a metal layer in which an amorphous region and a crystal region are formed in a mesh shape.

A method for manufacturing a three-dimensional shaped object by laminating a layer to manufacture the three-dimensional shaped object, the method including a layer forming step of forming the layer using a constituent material containing amorphous metal powder and a melting and solidifying step of irradiating the layer with a laser to melt and solidify the amorphous metal powder, in which in the melting and solidifying step, a melted and solidified portion obtained by melting and solidifying the amorphous metal powder by being irradiated with the laser is formed and irradiation of the laser is repeated so that at least one-half of a width of the melted and solidified portion overlaps, thereby allowing the layer to become a metal layer in which an amorphous region and a crystal region are formed in a mesh shape.

The invention belongs to the fields of amorphous alloy composites, additive manufacturing technology and hot isostatic pressing sintering forming, and in particular relates to a preparation method of tungsten particle reinforced amorphous matrix composites, comprising the following steps: (1) making tungsten powder and amorphous alloy powder into a preform by the micro-jetting and bonding 3D printing technology, specifically comprising: in the preforming process by micro-jetting and bonding, through a double-drum type powder feeding device, spraying tungsten powder and amorphous alloy powder into a layer of uniformly mixed powder layer by double nozzles, then bonding the powder layer into a bonding layer by the binder, and repeating the operations of spraying the powders and binder, so that a preform with uniform particle phase distribution is finally prepared; (2) placing the preform in a capsule, and performing heating and vacuumizing on the capsule in a heating furnace; and (3) placing the capsule in the hot isostatic pressing sintering furnace and performing hot press forming to obtain an amorphous matrix composite. In the present invention, through combining the cold additive micro-jetting and bonding technology with hot isostatic pressing sintering forming, a tungsten particle reinforced amorphous matrix composite with large size and uniform particle phase distribution can be prepared.

The present invention discloses a cold additive and hot forging combined forming method of amorphous alloy parts. The present invention belongs to the field of cold additive manufacturing technology and thermoplastic forming of amorphous alloy, and more particularly relates to a cold additive and hot forging combined forming method of amorphous alloy parts, the method comprising: (1) making amorphous alloy powder into a pre-forging blank by the micro-jetting and bonding 3D printing technology; and (2) placing the pre-forging blank in the step (1) in a closed forging die to perform hot closed-die forging so as to obtain an amorphous alloy part, wherein the contour size and shape of the pre-forging blank are designed according to the contour size and shape of the inner cavity of the closed forging die; and an exhaust hole is provided in the closed forging die such that gas generated by gasification or decomposition of the binder at a hot die forging temperature is discharged through the exhaust hole in the closed forging die. In the present invention, a bulk amorphous alloy part with a large size and a complex shape can be prepared by the cold additive and hot forging combined forming method.

The present invention provides a metal-based thermoelectric conversion material having a high figure-of-merit ZT, the thermoelectric conversion material being a p-type or n-type full-Heusler alloy, having a composition of an Fe2TiA type (wherein A is Si and/or Sn), and including crystal grains having an average grain diameter of 30-500 nm. In particular, in the case where the composition of an Fe2TiA type is represented by the empirical formula Fe2+Ti1+yA1+z, the values of , y, and z in an FeTi-A ternary alloy phase diagram lie within the range surrounded by the points (50, 37, 13), (45, 30, 25), (39.5, 25, 35.5), (50, 14, 36), (54, 21, 25), and (55.5, 25, 19.5) in terms of (Fe, Ti, A) in at %.

The present invention provides a metal-based thermoelectric conversion material having a high figure-of-merit ZT, the thermoelectric conversion material being a p-type or n-type full-Heusler alloy, having a composition of an Fe2TiA type (wherein A is Si and/or Sn), and including crystal grains having an average grain diameter of 30-500 nm. In particular, in the case where the composition of an Fe2TiA type is represented by the empirical formula Fe2+Ti1+yA1+z, the values of , y, and z in an FeTi-A ternary alloy phase diagram lie within the range surrounded by the points (50, 37, 13), (45, 30, 25), (39.5, 25, 35.5), (50, 14, 36), (54, 21, 25), and (55.5, 25, 19.5) in terms of (Fe, Ti, A) in at %.

A manufacturing method of an amorphous soft magnetic core using a Fe-based amorphous metallic powder includes size-sorting an amorphous metallic powder obtained by pulverizing an amorphous ribbon prepared by a rapid solidification process (RSP) and then using the amorphous metallic powder having a particle size distribution so as to comprise 10 to 85 wt. % of powder having a particle size of 75 to 100 m, 10 to 70 wt. % of powder having a particle size of 50 to 75 m, and 5 to 20 wt. % of powder having a particle size of 5 to 50 m to manufacture an amorphous soft magnetic core with excellent high-current DC bias characteristic and good core loss characteristic.

To provide a pressed powder magnetic material having excellent work safety during production of a pressed powder magnetic core and imposing less environmental burden; a pressed powder magnetic core having a high magnetic flux density, a high magnetic permeability, a low iron loss, and excellent mechanical strength; and a production method thereof. The pressed powder magnetic core material contains a granulation binder, a soft magnetic powder in which an insulating coating film is formed on the particle surface, and a glass frit whose softening point is a temperature being at least 100 C. lower than a magnetic annealing temperature; the soft magnetic powder being an iron-based amorphous alloy powder, the glass frit being contained in an amount of 0.3 to 1.0% by mass, the granulation binder being a polyvinyl alcohol having a degree of polymerization of 1000 or less and a degree of saponification of 50 to 100% by mole.