An object of the present invention is to provide a method for manufacturing a metal printed object, which can reduce the manufacturing time by a simple method without requiring a large-scale modification of the manufacturing apparatus, and the present invention provides a method for manufacturing a metal printed object in which, in the presence of a shielding gas supplied around a metal powder on a base plate, heat is supplied to the metal powder using energy rays to print a metal layer on the base plate, and the metal layer is subsequentially laminated, wherein when modeling a first metal layer in contact with the base plate, mass per unit volume of the shield gas at a temperature of 25 C. and a pressure of 0.1 MPa is in a range of 1.0010.sup.4 g/cm.sup.3 to 1.310.sup.3 g/cm.sup.3.

An object of the present invention is to provide a method for manufacturing a metal printed object, which can reduce the manufacturing time by a simple method without requiring a large-scale modification of the manufacturing apparatus, and the present invention provides a method for manufacturing a metal printed object in which, in the presence of a shielding gas supplied around a metal powder on a base plate, heat is supplied to the metal powder using energy rays to print a metal layer on the base plate, and the metal layer is subsequentially laminated, wherein when modeling a first metal layer in contact with the base plate, mass per unit volume of the shield gas at a temperature of 25 C. and a pressure of 0.1 MPa is in a range of 1.0010.sup.4 g/cm.sup.3 to 1.310.sup.3 g/cm.sup.3.

According to the present invention a method is provided for feeding a gas flow to an additive manufacturing space during a manufacturing process wherein the gas flow is established by a pump connected to the manufacturing space wherein the pump is controlled by a set differential pressure, and wherein the gas flow consists of Helium or the gas flow consists of a gas mixture comprising 30 Vol.-% Argon and 70 Vol.-% Helium or the gas flow consists of a gas mixture comprising 50 Vol.-% Argon and 50 Vol.-% Helium or the gas flow consists of a gas mixture comprising 70 Vol.-% Argon and 30 Vol.-% Helium.

According to the present invention a method is provided for feeding a gas flow to an additive manufacturing space during a manufacturing process wherein the gas flow is established by a pump connected to the manufacturing space wherein the pump is controlled by a set differential pressure, and wherein the gas flow consists of Helium or the gas flow consists of a gas mixture comprising 30 Vol.-% Argon and 70 Vol.-% Helium or the gas flow consists of a gas mixture comprising 50 Vol.-% Argon and 50 Vol.-% Helium or the gas flow consists of a gas mixture comprising 70 Vol.-% Argon and 30 Vol.-% Helium.

Disclosed herein are embodiments of mechanically alloyed powder feedstock and methods for spheroidizing them using microwave plasma processing. The spheroidized powder can be used in metal injection molding processes, hot isostatic processing, and additive manufacturing. In some embodiments, mechanical milling, such as ball milling, can be used to prepare high entropy alloys for microwave plasma processing.

Disclosed herein are embodiments of mechanically alloyed powder feedstock and methods for spheroidizing them using microwave plasma processing. The spheroidized powder can be used in metal injection molding processes, hot isostatic processing, and additive manufacturing. In some embodiments, mechanical milling, such as ball milling, can be used to prepare high entropy alloys for microwave plasma processing.

A method of preparing a hydrated calcium silicate (CSH) nano-film. The method includes: 1) synthesizing a hydrated calcium silicate powder having a calcium to silicon ratio (Ca/Si) of 0.5-3.0; 2) calcining the CSH powder obtained in 1) for 2-3 hours under a temperature of 150-250 C., cooling to approximately 25 C., and pressing the CSH powder under a pressure of 100-200 megapascal, to yield a target material; 3) fixing a substrate on a sample table of a magnetron sputtering apparatus, placing the target material obtained in 2) in a target position of the magnetron sputtering apparatus, pre-sputtering the target material for 5-10 minutes, rotating the substrate at a constant speed, sputtering the target material for 30-300 minutes, to yield a nano-film; and 4) soaking the nano-film obtained in 3) into in a saturated aqueous solution of calcium hydroxide at approximately 25 C. for 1-3 days.

A method of additive manufacture is disclosed. The method can include providing an enclosure surrounding a powder bed and having an atmosphere including helium gas. A high flux laser beam is directed at a defined two dimensional region of the powder bed. Powder is melted and fused within the defined two dimensional region, with less than 50% by weight of the powder particles being displaced into any defined two dimensional region that shares an edge or corner with the defined two dimensional region where powder melting and fusing occurs.

A method of additive manufacture is disclosed. The method can include providing an enclosure surrounding a powder bed and having an atmosphere including helium gas. A high flux laser beam is directed at a defined two dimensional region of the powder bed. Powder is melted and fused within the defined two dimensional region, with less than 50% by weight of the powder particles being displaced into any defined two dimensional region that shares an edge or corner with the defined two dimensional region where powder melting and fusing occurs.

The present application describes an article having a first metal component joined to a second metal component by a metallurgic joint of presintered powdered metal interposed between contiguous surfaces of the first metal component and the second metal component. The present application also describes a composition for use in a brazing process comprising a presintered powdered metal. The present application also describes a process for brazing including the following steps: presintering a powdered metal; adding the presintered powdered metal to a first and second metal component; and heating the combination of the first and second metal components containing the presintered powdered metal until the powdered metal melts and joins the metal components to form a metallurgic joint.