In one aspect, 3D printing systems for fabricating 3D soap objects are described herein. Such systems can form 3D soap objects from a particulate material and a fluid binder material based on design data, such as digital design data. In some cases, a 3D printing system comprises a build chamber comprising a build bed, a particulate material distribution device, and a fluid binder material dispenser. The particulate material distribution device can be configured to distribute successive layers of the particulate material on the build bed. The fluid binder material dispenser can be configured to selectively apply the fluid binder material to portions of the successive layers of particulate material in an amount sufficient to consolidate the portions to define cross-sectional portions of the object. In addition, the particulate material comprises a soap component in an amount of about 10 to 100% by weight.

An iron soap having a content A (%) of free fatty acid being 0.01≦A≦8.0, a content B (%) of water soluble salt being 0.01≦B≦0.5, and a granularity summary value C indicated in Formula (1) being 0.1≦C≦5.0, wherein the iron soap is a salt of a straight-chain saturated fatty acid having from 12 to 22 carbons and an iron.

Granularity summary value C=(D90−D10)/D50(where 1.0≦D50≦40.0)  Formula (1)

D10: 10% cumulative diameter (μm) of fatty acid metal salt particles on a volumetric basis

D50: 50% cumulative diameter (μm) of fatty acid metal salt particles on a volumetric basis

D90: 90% cumulative diameter (μm) of fatty acid metal salt particles on a volumetric basis

Provided is a method for manufacturing a sintered component having a hole formed therein, in which a sintered component having no defect, such as cracks, can be manufactured with good productivity and also a reduction in tool life accompanied by forming the hole can be suppressed. The method for manufacturing a sintered component includes a molding step of press-molding a raw material powder containing a metal powder and thus fabricating a green body; a drilling step of forming a hole in the green body using a candle-type drill and thus forming a thin-walled portion, of which a thickness Gt as measured between an inner circumferential surface of the hole and an outer surface of the green body is smaller than a diameter Gd of the hole; and a sintering step of sintering the green body after the drilling step.

Frangible firearm projectiles, firearm cartridges containing the same, and methods for forming the same. The firearm projectiles are formed from a compacted mixture of metal powders that includes zinc and iron powders and which may include an anti-sparking agent. The compacted mixture is heat treated for a time sufficient to form a plurality of discrete alloy domains within the compacted mixture. The frangible firearm projectile may be formed by a mechanism that includes vapor-phase diffusion bonding and oxidation of the metal powders and that does not include forming a liquid phase of any of the metal powders or utilizing a polymeric binder. A majority component of the frangible firearm projectile may be iron. One or more of zinc, bismuth, tin, copper, nickel, tungsten, boron, and/or alloys thereof may form a minority component of the frangible firearm projectile. The anti-sparking agent may include a borate, such as boric acid.

Frangible firearm projectiles, firearm cartridges containing the same, and methods for forming the same. The firearm projectiles are formed from a compacted mixture of metal powders that includes zinc and iron powders and which may include an anti-sparking agent. The compacted mixture is heat treated for a time sufficient to form a plurality of discrete alloy domains within the compacted mixture. The frangible firearm projectile may be formed by a mechanism that includes vapor-phase diffusion bonding and oxidation of the metal powders and that does not include forming a liquid phase of any of the metal powders or utilizing a polymeric binder. A majority component of the frangible firearm projectile may be iron. One or more of zinc, bismuth, tin, copper, nickel, tungsten, boron, and/or alloys thereof may form a minority component of the frangible firearm projectile. The anti-sparking agent may include a borate, such as boric acid.

Provided are: metallic copper particles exhibiting excellent low-temperature sintering properties at temperatures equal to or lower than 300° C.; and a production method therefor. In these metallic copper particles, metallic copper fine particles are adhered to the surfaces of large-diameter metallic copper particles. With regard to the metallic copper particles to be produced, copper oxide and hypophosphoric acid and/or a salt thereof are mixed and reduced, preferably in the presence of 1-500 mass % of gelatin and/or collagen peptide. The reduction reaction temperature is preferably in the range of 20-100° C. The produced metallic copper particles have a volume resistivity value when heated to a temperature of 300° C. under a nitrogen atmosphere of 1×10-2 Ω.Math.cm or less.

Embodiments described herein relate generally to systems and methods for using nanocrystalline metal alloy particles or powders to create nanocrystalline and/or microcrystalline metal alloy articles using additive manufacturing. In some embodiments, a manufacturing method for creating articles includes disposing a plurality of nanocrystalline particles and selectively binding the particles together to form the article. In some embodiments, the nanocrystalline particles can be sintered to bind the particles together. In some embodiments, the plurality of nanocrystalline particles can be disposed on a substrate and sintered to form the article. The substrate can be a base or a prior layer of bound particles. In some embodiments, the nanocrystalline particles can be selectively bound together (e.g., sintered) at substantially the same time as they are disposed on the substrate.

A kit for three-dimensional printing a metal object is described. The kit comprises a build material and a shaping composition. The build material comprises metallic particles. The shaping composition comprises a metallic mixture for forming an intermetallic compound with the metallic particles and/or that is exothermically reactive.

A kit for three-dimensional printing a metal object is described. The kit comprises a build material and a shaping composition. The build material comprises metallic particles. The shaping composition comprises a metallic mixture for forming an intermetallic compound with the metallic particles and/or that is exothermically reactive.

A low melt superalloy powder mixture is provided for use with additive manufacturing or welding metal components or portions thereof. The low melt superalloy powder may include by weight about 9.5% to about 10.5% chromium, about 2.9% to about 3.4% cobalt, about 8.0% to about 9.0% aluminum, about 3.8% to about 4.3% tungsten, about 0.8% to about 1.2% molybdenum, about 10% to about 20% tantalum, about 3% to about 12% hafnium, and at least 40% nickel.