The present invention relates to a method for producing an abrasion-resistant coating on surface of a 3D printed titanium alloy component, which belongs to the field of surface modification. The method comprises using spherical TC4 titanium alloy powder as a base material and adopting selective laser melting (SLM) technology to manufacture a 3D printed titanium alloy component in a layer-by-layer stacking manner, using graphene oxide to perform friction-induction treatment, and making the graphene oxide infiltrate into the surface of the TC4 titanium alloy component to obtain a graphene oxide surface coating. The goal of improving the friction and wear performance of the TC4 titanium alloy printed components is achieved. The preparation method is simple, and the steps are easy to operate. Introducing the graphene oxide is beneficial to reduce the generation of wear debris during the friction and wear processes and improve tribological characteristics of the base material.

The present invention relates to a method for producing an abrasion-resistant coating on surface of a 3D printed titanium alloy component, which belongs to the field of surface modification. The method comprises using spherical TC4 titanium alloy powder as a base material and adopting selective laser melting (SLM) technology to manufacture a 3D printed titanium alloy component in a layer-by-layer stacking manner, using graphene oxide to perform friction-induction treatment, and making the graphene oxide infiltrate into the surface of the TC4 titanium alloy component to obtain a graphene oxide surface coating. The goal of improving the friction and wear performance of the TC4 titanium alloy printed components is achieved. The preparation method is simple, and the steps are easy to operate. Introducing the graphene oxide is beneficial to reduce the generation of wear debris during the friction and wear processes and improve tribological characteristics of the base material.

A process for making full dense components of a carbon-containing steel, comprises the steps of: a) making a powder of the carbon-containing steel by gas atomization wherein the carbon content is low, less than 0.15 wt %, b) agglomerating the powder from step a) with at least one hydrocolloid and elemental carbon, c) compacting the agglomerated powder from step b) to a density of at least 80% of theoretical density, with the proviso that the compacted agglomerated powder still is porous allowing transport of gas to and from its interior, and d) sintering the compacted powder to a density of more than 98% of theoretical density, preferably more than 99% of theoretical density, wherein a gas comprising carbon is added during sintering and finally subjecting the component to HVC. Advantages include that it is possible to manufacture a dense component of powders which otherwise are difficult to compact.

A process for making full dense components of a carbon-containing steel, comprises the steps of: a) making a powder of the carbon-containing steel by gas atomization wherein the carbon content is low, less than 0.15 wt %, b) agglomerating the powder from step a) with at least one hydrocolloid and elemental carbon, c) compacting the agglomerated powder from step b) to a density of at least 80% of theoretical density, with the proviso that the compacted agglomerated powder still is porous allowing transport of gas to and from its interior, and d) sintering the compacted powder to a density of more than 98% of theoretical density, preferably more than 99% of theoretical density, wherein a gas comprising carbon is added during sintering and finally subjecting the component to HVC. Advantages include that it is possible to manufacture a dense component of powders which otherwise are difficult to compact.

A method for recovering metal values from a molten slag composition includes atomizing the slag with an oxygen-containing gas in a gas atomization apparatus, to produce solid slag granules. Oxygen in the atomizing gas converts metals to magnetic metal compounds, thereby magnetizing the metal-containing slag granules. These metal-containing slag granules are then magnetically separated. Larger amounts of metals may be removed by passing the molten slag through a pre-settling pan with an adjustable base, and/or discontinuing atomization where the metal content of the slag exceeds a predetermined amount. Solid slag granules produced by atomization may be charged to a recovery unit for recovery of one or more metal by-products. An apparatus for recovering metal values from molten slag includes a gas atomization apparatus, a flow control device for controlling the flow of atomizing gas, a control system, and one or more sensors to detect metal values in the slag.

A plastic forming mold made from a stainless steel, having in weight % (wt. %): C 0.32-0.50, Si 0.1-1.0, Mn 0.1-0.8, Cr 11-14, Mo 1.8-2.6, V 0.35-0.70, N 0.05-0.19, optional elements, and a balance of Fe apart from impurities. The stainless steel is hardened and tempered and has a matrix comprising ≥90 vol. % martensite.

A plastic forming mold made from a stainless steel, having in weight % (wt. %): C 0.32-0.50, Si 0.1-1.0, Mn 0.1-0.8, Cr 11-14, Mo 1.8-2.6, V 0.35-0.70, N 0.05-0.19, optional elements, and a balance of Fe apart from impurities. The stainless steel is hardened and tempered and has a matrix comprising ≥90 vol. % martensite.

A process for producing a crack-free and dense three-dimensional article of a gamma-prime precipitation-strengthened nickel-base superalloy, with more than 6 wt. % of [2 Al (wt. %)+Ti (wt. %)], which involves: (a) preparing a powder layer of a gamma-prime precipitation-strengthened nickel-based alloy material, with uniform thickness on a SLM apparatus substrate plate, or on a previously processed powder layer; (b) melting the prepared powder layer by scanning with a focused laser beam an article cross section area according to a three-dimensional sliced model with calculated cross sections, stored in the SLM control unit; (c) lowering the substrate plate by one layer thickness; and (d) repeating (a) to (c) until reaching a final cross section according to the three-dimensional sliced model, wherein, for (b), the laser power, focus diameter of the focal spot, and scan speed of the focused laser beam are adjusted to obtain heat dissipation welding.

The metal ceramic powder with a particle size of 15-45 .Math.m and suitable for thermal spraying is prepared through a combination of mechanical ball milling, spray granulation, and vacuum sintering. The metal ceramic powder is sprayed on a surface of a steel substrate adopting the high velocity oxygen fuel (HVOF) technology with oxygen-propane as fuel and taking oxygen as a combustion improver, propane as fuel, nitrogen as powder feeding carrier gas, and air as a cooling medium to prepare and form the NiCrBSi—ZrB2 composite coating. The present disclosure solves the problem that ZrB.sub.2 ceramic is difficult to compact during sintering and improves powder bonding strength and fluidity. The preparation method is simple, has advantages of high coating deposition efficiency and convenient equipment operation, and is cost-effective. The preparation method can improve thermal corrosion resistance and high-temperature wear resistance of a surface of boiler, and prolonging lifetime of the boiler.

The present disclosure provides an aluminum alloy workpiece and a preparation method thereof. By optimizing a composition of the aluminum alloy workpiece, the aluminum alloy workpiece can be prepared by laser powder bed fusion (LPBF) in the preparation method, thereby forming a target metallographic phase. The preparation method overcomes the problem that the composition of a high temperature-resistant and high-strength aluminum alloy designed based on the traditional casting and forging process cannot be matched with the LPBF, and makes full use of rapid cooling of the LPBF to prepare an aluminum alloy composition of a target crystal phase. The preparation method combines the aluminum alloy composition with the LPBF to achieve mutual promotion, thereby forming a target workpiece, such that an aluminum alloy with high strength and toughness at room temperature/high temperature can be prepared by the LPBF.