The present invention discloses a Fe—Al intermetallic compound filter element and a preparation method thereof, which relates to the field of powder metallurgy and filtration technology. In view of the drawback in the prior art that using a fiber felt as a filtration layer reduces stability and reliability of a filter, the present invention provides an Fe—Al intermetallic compound filter element, which comprises: at least two filter-element parts, and a rebar connecting the at least two filter-element parts transversely by means of welding, wherein, the filter-element parts each comprises at least two segments of Fe—Al intermetallic compound filter-element powder tube and a connector connecting the at least two segments of Fe—Al intermetallic compound filter-element powder tube end-to-end by means of welding; and wherein, the at least two segments of Fe—Al intermetallic compound filter-element powder tube each comprises a substrate framework and a surface filtration membrane.

A composite fiber composed of at least a metal sintered body and a ceramic sintered body. In the composite fiber, the metal sintered body and the ceramic sintered body are adjacent to each other. The composite fiber having the metal sintered body and the ceramic sintered body can have a tensile strength of 5 kgf/mm.sup.2 or more.

A composite fiber composed of at least a metal sintered body and a ceramic sintered body. In the composite fiber, the metal sintered body and the ceramic sintered body are adjacent to each other. The composite fiber having the metal sintered body and the ceramic sintered body can have a tensile strength of 5 kgf/mm.sup.2 or more.

A superhard material-containing object is configured to have a controlled and repeatable three-dimensional geometry and/or shape. The object further includes a desired three-dimensional spatial variation in microstructure, grain size and/or composition. The superhard material is selected from the group consisting of diamond, boron-doped diamond and cubic boron nitride. A process for production of a superhard material-containing object from a powder of a superhard material, a binder and an optional additive, includes the steps of: (a) producing a feedstock of the superhard material and a polymer binder; (b) extruding one or more filaments from a granulated superhard material-binder feedstock; (c) preparing a printed superhard material-containing object using the one or more filaments; (d) subjecting the printed object to debinding to prepare a debindered object; and (e) sintering the debindered printed object to produce the superhard material-containing object.

A superhard material-containing object is configured to have a controlled and repeatable three-dimensional geometry and/or shape. The object further includes a desired three-dimensional spatial variation in microstructure, grain size and/or composition. The superhard material is selected from the group consisting of diamond, boron-doped diamond and cubic boron nitride. A process for production of a superhard material-containing object from a powder of a superhard material, a binder and an optional additive, includes the steps of: (a) producing a feedstock of the superhard material and a polymer binder; (b) extruding one or more filaments from a granulated superhard material-binder feedstock; (c) preparing a printed superhard material-containing object using the one or more filaments; (d) subjecting the printed object to debinding to prepare a debindered object; and (e) sintering the debindered printed object to produce the superhard material-containing object.

In a three-dimensional printing method example, a liquid functional agent is selectively applied. The liquid functional agent includes an alloying agent. A metallic build material is applied. The liquid functional agent is selectively applied before the metallic build material, after the metallic build material, or both before and after the metallic build material. The liquid functional agent patterns the metallic build material to form a composite layer. At least some of the metallic build material is exposed to energy to melt the at least some of the metallic build material to form a layer. Upon contact or after energy exposure, the alloying agent and the build material alter a composition of the composite layer.

This application provides Fe—Mn—Al—C lightweight steel, including: Fe, wherein a weight percentage of the Fe is greater than or equal to 50.4 wt %; Mn, wherein a weight percentage of the Mn is 25-35 wt %; Al, wherein a weight percentage of the Al is 6-12 wt %; C, wherein a weight percentage of the C is 0.8-2.0 wt %; and O, wherein a weight percentage of the O is 0.005-0.6 wt %. This application further provides a terminal to which the Fe—Mn—Al—C lightweight steel is applied, a production method for the Fe—Mn—Al—C lightweight steel, a steel mechanical part, and an electronic device. The lightweight steel in this application has low density, high strength, and high elongation.

This application provides Fe—Mn—Al—C lightweight steel, including: Fe, wherein a weight percentage of the Fe is greater than or equal to 50.4 wt %; Mn, wherein a weight percentage of the Mn is 25-35 wt %; Al, wherein a weight percentage of the Al is 6-12 wt %; C, wherein a weight percentage of the C is 0.8-2.0 wt %; and O, wherein a weight percentage of the O is 0.005-0.6 wt %. This application further provides a terminal to which the Fe—Mn—Al—C lightweight steel is applied, a production method for the Fe—Mn—Al—C lightweight steel, a steel mechanical part, and an electronic device. The lightweight steel in this application has low density, high strength, and high elongation.

The dust core comprises a plurality of soft magnetic iron-based particles, a coating layer disposed on each of the surfaces of the soft magnetic iron-based particles, an interstitial layer disposed between the coating layers, and a nanopowder disposed between the soft magnetic iron-based particles. The coating layer is a layer of a compound comprising Fe, Si, O, B and N; and the nanopowder is a powder of a compound comprising O, N and at least one element selected from the group consisting of Fe, Si, Zr, Co, Al, Mg, Mn and Ni.

The dust core comprises a plurality of soft magnetic iron-based particles, a coating layer disposed on each of the surfaces of the soft magnetic iron-based particles, an interstitial layer disposed between the coating layers, and a nanopowder disposed between the soft magnetic iron-based particles. The coating layer is a layer of a compound comprising Fe, Si, O, B and N; and the nanopowder is a powder of a compound comprising O, N and at least one element selected from the group consisting of Fe, Si, Zr, Co, Al, Mg, Mn and Ni.