A method for producing a powdered starting material, which is provided for production of rare earth magnets, including the following steps: pulverizing an alloy, including at least one rare earth metal, wherein a powdered intermediate product is formed from the alloy including at least one rare earth metal, and carrying out at least one classification aimed at particle size and/or density for the powdered intermediate product, wherein a fraction of the powdered intermediate product, which is formed by means of the at least one classification, for fabrication of rare earth magnets. Furthermore, at least one dynamic classifier is provided, implementing at least one classification directed at particle size and/or density for the powdered intermediate product and thereby separates the fraction from the powdered intermediate product, which forms the starting material provided for manufacturing rare earth magnets.

Disclosed is a nano dispersion copper alloy with high air-tightness and low free oxygen content and a brief manufacturing process thereof, wherein alloy comprises the following components: Al.sub.2O.sub.3, Ca and La. The manufacturing process comprises the following steps of: preparing Cu—Al.sub.2O.sub.3 alloy powder by an internal oxidation method; mixing the Cu—Al.sub.2O.sub.3 alloy powder with Cu—Ca—La alloy powder; sheathing the mixed powder under protection of argon; performing hot extrusion and then rotary forging; vacuumizing the sheath after the rotary forging; and sealing and placing the sheath in a nitrogen atmosphere with a temperature of 450° C. to 550° C. and a pressure intensity of 40 Mpa to 60 Mpa for 3 hours to 5 hours. The dispersion copper prepared by the present disclosure has the advantages of low free oxygen content (≤15 ppm), high dimensional stability, good air-tightness and an air leakage rate≤1.0×10.sup.−10 Pa m.sup.3/s after hydrogen annealing.

Metallic matrix composites include a high strength titanium aluminide alloy matrix and an in situ formed aluminum oxide reinforcement. The atomic percentage of aluminum in the titanium aluminide alloy matrix can vary from 40% to 48%. Included are methods of making the metallic matrix composites, in particular, through the performance of an exothermic chemical reaction. The metallic matrix composites can exhibit low porosity.

A graphene-reinforced alloy composite material and a preparation method thereof are disclosed. The method includes preparing a porous graphene colloid, smelting a first-part alloy, pouring it into the porous graphene colloid to be formed, subjecting the formed product to a hot extrusion, and pulverizing into a powder I; smelting a second-part alloy into an alloy melt II, adding a high-purity silicon powder therein, mixing by stirring, and atomizing to obtain a powder II; mixing the powder I and the powder II, to obtain a pretreated alloy powder; placing the pretreated alloy powder in a high-purity ark, transferring the high-purity ark to a high-temperature tubular furnace, subjecting the pretreated alloy powder to a redox treatment, and introducing methane and hydrogen to grow graphene, to obtain a coated alloy powder; subjecting the coated alloy powder to a pre-compressing molding and sintering, to obtain the graphene-reinforced alloy composite material.

A graphene-reinforced alloy composite material and a preparation method thereof are disclosed. The method includes preparing a porous graphene colloid, smelting a first-part alloy, pouring it into the porous graphene colloid to be formed, subjecting the formed product to a hot extrusion, and pulverizing into a powder I; smelting a second-part alloy into an alloy melt II, adding a high-purity silicon powder therein, mixing by stirring, and atomizing to obtain a powder II; mixing the powder I and the powder II, to obtain a pretreated alloy powder; placing the pretreated alloy powder in a high-purity ark, transferring the high-purity ark to a high-temperature tubular furnace, subjecting the pretreated alloy powder to a redox treatment, and introducing methane and hydrogen to grow graphene, to obtain a coated alloy powder; subjecting the coated alloy powder to a pre-compressing molding and sintering, to obtain the graphene-reinforced alloy composite material.

The disclosure relates to sintering compositions that can be used in three-dimensional printing or additive manufacturing processes. The sintering compositions generally include one or more metallic iron-containing powders and a minor amount of a boron-containing powder as a sintering aid. Sintered models or products formed from the sintering compositions have substantially improved density and surface roughness values relative to models formed without the boron-containing powder.

The disclosure relates to sintering compositions that can be used in three-dimensional printing or additive manufacturing processes. The sintering compositions generally include one or more metallic iron-containing powders and a minor amount of a boron-containing powder as a sintering aid. Sintered models or products formed from the sintering compositions have substantially improved density and surface roughness values relative to models formed without the boron-containing powder.

Provided is a body, a method for manufacturing the body and a method of using of the body for nuclear shielding in a nuclear reactor. The body may include boron, iron, chromium, carbon and tungsten.

Provided is a body, a method for manufacturing the body and a method of using of the body for nuclear shielding in a nuclear reactor. The body may include boron, iron, chromium, carbon and tungsten.

A composition of matter defined by the general formula of M.sub.2+vL.sub.1−vX.sub.2, wherein: X is carbon; M represents a transition metal selected from the group consisting of Ti, Ta, Sc, Cr, Zr, Mo, V, and Nb; and L represents a lanthanide element selected from the group consisting of Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.