A soft magnetic alloy powder contains Fe, Si, and at least one of Cr and Al, as constituent elements, wherein, on the surface of each grain constituting the alloy powder, an oxide film is provided which is such that: it contains Si, as well as at least one of Cr and Al, as constituent elements; these elements are contained at higher percentages by mass than those in the alloy part inside the grain; and the content of Si, expressed in percentage by mass, is higher than the total content of Cr and Al. The soft magnetic metal powder can achieve a higher filling rate.

An alloy powder having an alloy composition represented by Fe.sub.100-a-b-c-d-e-fCu.sub.aSi.sub.bB.sub.cCr.sub.dSn.sub.eC.sub.f, wherein a, b, c, d, e and f are atomic % meeting 0.80≤a≤1.80, 2.00≤b≤10.00, 11.00≤c≤17.00, 0.10≤d≤2.00, 0.01≤e≤1.50, and 0.10≤f≤0.40.

An iron-based alloy composition including: boron (B): 1.6-2.4 wt. %; carbon (C): 2.2-3.0 wt. %; chromium (Cr): 3.5-5.0 wt. %; manganese (Mn): below 0.8 wt. %; molybdenum (Mo): 16.0-19.5 wt. %; nickel (Ni): 1.0-2.0 wt. %; silicon (Si): 0.2-2.0 wt. %; vanadium (V): 10.8-13.2 wt. %; and balanced with iron (Fe). Further, an item including a substrate portion and a hardfacing coating bonded to the substrate portion, wherein the hardfacing coating is made by an overlay welding process using the iron-based alloy composition.

Disclosed in the present invention are a heavy rare earth alloy, neodymium-iron-boron permanent magnet material, a raw material, and a preparation method. The heavy rare earth alloy comprises the following components: RH: 30-100 mas %, not including 100 mas %; X, 0-20 mas %, not including 0; B: 0-1.1 mas %; and Fe and/or Co: 15-69 mas %, RH comprising one or more heavy rare earth elements in Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Sc, and X being Ti and/or Zr. When the heavy rare earth alloy of the present invention is used as a sub-alloy to prepare the neodymium-iron-boron permanent magnet material, a high utilization rate of heavy rare earth is achieved, so that the coercivity can also be greatly improved while the neodymium-iron-boron permanent magnet material maintains high remanence.

Alloy powder comprises particles. The particles include specific particles. Each of the specific particles has a surface layer on which a divided trace is formed.

A sintered magnet body (R.sub.aT.sup.1.sub.bM.sub.cB.sub.d) coated with a powder mixture of an intermetallic compound (R.sup.1.sub.iM.sup.1.sub.j, R.sup.1.sub.xT.sup.2.sub.yM.sup.1.sub.z, R.sup.1.sub.iM.sup.1.sub.jH.sub.k), alloy (M.sup.1.sub.dM.sup.2.sub.e) or metal (M.sup.1) powder and a rare earth (R.sup.2) oxide is diffusion treated. The R.sup.2 oxide is partially reduced during the diffusion treatment, so a significant amount of R.sup.2 can be introduced near interfaces of primary phase grains within the magnet through the passages in the form of grain boundaries. The coercive force is increased while minimizing a decline of remanence.

A 3D printed diamond/metal matrix composite material and a preparation method and application thereof are provided. The composite material includes core-shell doped diamond, a metal matrix, and an additive, where the core-shell doped diamond includes a core, a transition layer, a shell, a coating, a porous layer, and a modification layer. The preparation method includes: uniformly mixing the diamond, the metal matrix, and the additive and performing 3D printing according to a 3D CAD slice model to obtain the composite material designed by the model. The metal matrix and the diamond surface of the composite material are mainly metallurgically bound, which can improve the binding strength between the diamond and the metal matrix, thereby improving the use properties of the composite material and a diamond tool. The core-shell doped diamond has good ablation resistance, and can effectively avoid and reduce thermal damage to diamond in a 3D printing forming process.

An apparatus and a method for fabricating a magnetic material with variable magnetic alignment are disclosed. For example, the apparatus includes a reservoir storing magnetic particles, a heater coupled to the reservoir to melt the magnetic particles, a nozzle coupled to the reservoir to receive the magnetic particles that are melted, wherein the nozzle includes a rotatable collar that includes at least one magnet, a platform below the nozzle to receive the magnetic particles that are melted that are dispensed by the nozzle, and a controller communicatively coupled to the heater, the nozzle, and the platform to control operation of the heater, the nozzle, the rotatable collar of the nozzle, and the platform.

The invention provides a powder magnetic core and a method for manufacturing a powder magnetic core through simple compression molding and capable of manufacturing a complicatedly shaped powder magnetic core with reliable high strength and insulating properties. A method for manufacturing a powder magnetic core with a metallic soft magnetic material powder includes: a first step including mixing a soft magnetic material powder and a binder; a second step including compression molding the mixture obtained after the first step; a third step including performing at least one of grinding and cutting on the compact obtained after the second step; and a fourth step including heat-treating the compact after the third step, wherein in the fourth step, the compact is heat-treated so that an oxide layer containing an element constituting the soft magnetic material powder is formed on the surface of the soft magnetic material powder.

Alloy compositions for 3D metal printing procedures which provide metallic parts with high hardness, tensile strengths, yield strengths, and elongation. The alloys include Fe, Cr and Mo and at least three or more elements selected from C, Ni, Cu, Nb, Si and N. As built parts indicate a tensile strength of at least 1000 MPa, yield strength of at least 640 MPa, elongation of at least 3.0% and hardness (HV) of at least 375.