Methods for making a plurality of microparticles from a reaction solution that includes an organic acid in a solvent are provided. An example aerosol ink includes a plurality of palladium-chromium metallic microparticles dispersed in a solvent system, wherein the plurality of palladium-chromium metallic microparticles include a palladium-chromium alloy.

A method is provided for mitigating metal particle leakage from a three-dimensional printed part. The method includes providing an additively manufactured part manufactured out of one or more materials, and the one or more materials comprise a metal. The method also includes applying a coating over surfaces of the additively manufactured part to keep metal particles from leaking from the additively manufactured part.

The present disclosure is related to a method to control sizes of core-shell nanoparticles comprising the steps of: manufacturing slurry by irradiating ultrasonic waves to a dispersion solution containing a reducing solvent, a carbon support, a transition metal precursor and a precious metal precursor; manufacturing a solid by filtering the manufactured slurry, followed by washing and drying; and manufacturing a nanoparticle of a transition metal core and a platinum shell by heat-treating the dried solid at a temperature of 450 to 900° C. and a pressure of 1 to 90 bar for 0.5 to 10 hours under N.sub.2 atmosphere.

An anti-fretting coating composition that is operationally stable at temperatures of 800° F. to 2650° F. is provided. The anti-fretting coating composition primarily includes cobalt and aluminum oxide and may also include other modifying phases that enhance the overall tribological performance. A component coated with the anti-fretting coating composition is also provided. The component includes a substrate having a first contact surface shaped to cooperate with a second contact surface of an abutting member in a manner which can develop wear between the first contact surface and the second contact surface. The first contact surface includes an anti-fretting coating thereon formed from the disclosed anti-fretting coating composition.

A manufacturing method of oxidation resistant alloy includes: producing a first formed member by applying compression forming to metal powder; and applying compression forming to the first formed member in a state in which the first formed member is covered with alloy powder different from the metal powder. The oxidation resistance of the major constituent of the alloy powder is higher than the oxidation resistance of the major constituent of the metal powder. Producing the first formed member may include applying the compression forming to the metal powder without melting the metal powder. Applying the compression forming to the first formed member may include: producing a second formed member by applying compression forming to the alloy powder without melting the alloy powder; and sintering the second formed member.

In various embodiments, metallic alloy powders are utilized as feedstock, or to fabricate feedstock, utilized in additive manufacturing processes to form three-dimensional metallic parts.

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 method for the manufacture of a three-dimensional object using a refractory matrix material is provided. The method includes the additive manufacture of a green body from a powder-based refractory matrix material followed by densification via chemical vapor infiltration (CVI). The refractory matrix material can be a refractory ceramic (e.g., silicon carbide, zirconium carbide, or graphite) or a refractory metal (e.g., molybdenum or tungsten). In one embodiment, the matrix material is deposited according to a binder-jet printing process to produce a green body having a complex geometry. The CVI process increases its density, provides a hermetic seal, and yields an object with mechanical integrity. The residual binder content dissociates and is removed from the green body prior to the start of the CVI process as temperatures increase in the CVI reactor. The CVI process selective deposits a fully dense coating on all internal and external surfaces of the finished object.

CERMET fuel element includes a fuel meat of consolidated ceramic fuel particles (preferably refractory-metal coated HALEU fuel kernels) and an array of axially-oriented coolant flow channels. Formation and lateral positions of coolant flow channels in the fuel meat are controlled during manufacturing by spacer structures that include ceramic fuel particles. In one embodiment, a coating on a sacrificial rod (the rod being subsequently removed) forms the coolant channel and the spacer structures are affixed to the coating; in a second embodiment, a metal tube forms the coolant channel and the spacer structures are affixed to the metal tube. The spacer structures laterally position the coolant channels in spaced-apart relation and are consolidated with the ceramic fuel particles to form CERMET fuel meat of a fuel element, which are subsequently incorporated into fuel assemblies that are distributively arranged in a moderator block within a nuclear fission reactor, in particular for propulsion.

Provided is a process for providing a flake powder characterized by a particle size of −40 mesh to +200 mesh; a Scott density of at least 1.458 g/cm.sup.3; and a flow of at least 1 g/s. The process includes introducing a milled flake powder in a solvent to a first dryer; removing the solvent at a temperature below a melting point of the solvent under a reduced atmosphere to obtain a partially dry flake powder; and introducing the partially dry flake powder to a second dryer to form flake powder wherein particles of partially dry flake powder are heated and simultaneously subjected to an uncorrelated motion relative to adjacent particles.