The present invention relates to an additive manufacturing powder material including Fe alloy particles each having an oxide film on a surface thereof, in which the Fe alloy particles satisfy d≤15 and I/d≤0.025, where d [nm] represents a thickness of the oxide film, and a peak intensity ratio I represents an intensity ratio IB/IA of a peak B in a region B of a Raman shift of 1,309 to 1,329 cm.sup.−1 to a peak A in a region A of a Raman shift of 657.5 to 677.5 cm.sup.−1 in a Raman spectrum.

The present invention relates to an additive manufacturing powder material including Fe alloy particles each having an oxide film on a surface thereof, in which the Fe alloy particles satisfy d≤15 and I/d≤0.025, where d [nm] represents a thickness of the oxide film, and a peak intensity ratio I represents an intensity ratio IB/IA of a peak B in a region B of a Raman shift of 1,309 to 1,329 cm.sup.−1 to a peak A in a region A of a Raman shift of 657.5 to 677.5 cm.sup.−1 in a Raman spectrum.

This disclosure relates to a manufacture method of a bushing, a bushing and an excavator to alleviate the problems of insufficient lubricity and wear resistance of the bushing. The bushing includes an inner ring and an outer ring. The manufacture method of the bushing includes the following steps: grinding a first mixed powder containing Fe, Al, Ti, Cr and V, nitriding the ground first mixed powder to form a nitrogen-rich stable compound powder, and then carrying out molding by pressing and sintering the nitrogen-rich stable compound powder to form the outer ring; grinding a second mixed powder containing Fe and Mo, sulfurizing the ground second mixed powder to form a sulfurized powder containing FeS and MoS.sub.2, and carrying out molding by pressing the sulfurized powder to form the inner ring; and placing the inner ring in the outer ring and carrying out sintering to obtain the bushing.

This disclosure relates to a manufacture method of a bushing, a bushing and an excavator to alleviate the problems of insufficient lubricity and wear resistance of the bushing. The bushing includes an inner ring and an outer ring. The manufacture method of the bushing includes the following steps: grinding a first mixed powder containing Fe, Al, Ti, Cr and V, nitriding the ground first mixed powder to form a nitrogen-rich stable compound powder, and then carrying out molding by pressing and sintering the nitrogen-rich stable compound powder to form the outer ring; grinding a second mixed powder containing Fe and Mo, sulfurizing the ground second mixed powder to form a sulfurized powder containing FeS and MoS.sub.2, and carrying out molding by pressing the sulfurized powder to form the inner ring; and placing the inner ring in the outer ring and carrying out sintering to obtain the bushing.

A lead-based alloy containing alloying additions of bismuth, antimony, arsenic, and tin is used for the production of doped leady oxides, lead-acid battery active materials, lead-acid battery electrodes, and lead-acid batteries.

A lead-based alloy containing alloying additions of bismuth, antimony, arsenic, and tin is used for the production of doped leady oxides, lead-acid battery active materials, lead-acid battery electrodes, and lead-acid batteries.

A method for finely powdering tungsten powder, which includes: a process for classifying a material tungsten powder into a fine powder having a relatively small average particle diameter and a coarse powder having a relatively large average particle diameter; an oxidation process for forming an oxide film on the particle surface of the coarse powder; and an alkali treatment process for removing the oxide film formed in the oxidation process and a natural oxide film formed on the fine powder with an alkali aqueous solution. Also disclosed is a method for producing ultrafine tungsten powder, which includes obtaining tungsten powder having an average particle diameter of 0.04 to 0.4 μm and a BET specific surface area of 5 to 15 m.sup.2/g by the above method for finely powdering.

A method for the manufacturing a representative homotop of a binary metallic nanoparticle (A.sub.xB.sub.1-x).sub.N with a given composition A.sub.xB.sub.1-x, number of atoms N and shape, and at a given temperature, including generating a plurality of homotops, calculating an energy of the generate homotops using formula:

[00001]$\begin{array}{cc}{E}_{\mathrm{TOP}}=E_0\left(x,N\right)+{\mathrm{.Math.}}_{\mathrm{BOND}}^{A.Math.\text{-}.Math.B}\left(x\right).Math.N_{\mathrm{BOND}}^{A.Math.\text{-}.Math.B}+\underset{i}{.Math.}.Math..Math.{\mathrm{.Math.}}_{\mathrm{CORNER},i}^A\left(x\right).Math.N_{\mathrm{CORNER},i}^A+\underset{j}{.Math.}.Math..Math.{\mathrm{.Math.}}_{\mathrm{EDGE},j}^A\left(x\right).Math.N_{\mathrm{EDGE},j}^A+{.Math.}_{\left\{\mathrm{LMN}\right\}}.Math.{\mathrm{.Math.}}_{\left\{\mathrm{LMN}\right\}}^A\left(x\right).Math.N_{\left\{\mathrm{LMN}\right\}}^A& \left(1\right)\end{array}$

where E.sub.0(x, N) is constant for a given particle, ε.sub.BOND.sup.A-B(x) is related to an energy gain caused by the mixing of both metals, N.sub.BOND.sup.A-B is a number of heteroatomic

A method for the manufacturing a representative homotop of a binary metallic nanoparticle (A.sub.xB.sub.1-x).sub.N with a given composition A.sub.xB.sub.1-x, number of atoms N and shape, and at a given temperature, including generating a plurality of homotops, calculating an energy of the generate homotops using formula:

[00001]$\begin{array}{cc}{E}_{\mathrm{TOP}}=E_0\left(x,N\right)+{\mathrm{.Math.}}_{\mathrm{BOND}}^{A.Math.\text{-}.Math.B}\left(x\right).Math.N_{\mathrm{BOND}}^{A.Math.\text{-}.Math.B}+\underset{i}{.Math.}.Math..Math.{\mathrm{.Math.}}_{\mathrm{CORNER},i}^A\left(x\right).Math.N_{\mathrm{CORNER},i}^A+\underset{j}{.Math.}.Math..Math.{\mathrm{.Math.}}_{\mathrm{EDGE},j}^A\left(x\right).Math.N_{\mathrm{EDGE},j}^A+{.Math.}_{\left\{\mathrm{LMN}\right\}}.Math.{\mathrm{.Math.}}_{\left\{\mathrm{LMN}\right\}}^A\left(x\right).Math.N_{\left\{\mathrm{LMN}\right\}}^A& \left(1\right)\end{array}$

where E.sub.0(x, N) is constant for a given particle, ε.sub.BOND.sup.A-B(x) is related to an energy gain caused by the mixing of both metals, N.sub.BOND.sup.A-B is a number of heteroatomic

The present invention relates to a method for the production of palladium(0) powder in which a palladium(0) starting powder is subjected to a thermal treatment in a furnace at a temperature of no more than 370° C. in a hydrogen gas atmosphere.