A thermoelectric conversion material has a La.sub.2O.sub.3-type crystal structure and is of n-type. The thermoelectric conversion material has a composition represented by Mg.sub.3+m-a-bA.sub.aB.sub.bD.sub.2-e-fE.sub.eF.sub.f. D is at least one of Sb or Bi. E is at least one of P or As. m is a value of greater than or equal to −0.1 and less than or equal to 0.4. e is a value of greater than or equal to 0.001 and less than or equal to 0.25. A is at least one of Y, Sc, La, or Ce. F is at least one of Se or Te. a and f are values that satisfy a condition of 0.0001≤a+f≤0.06. B is at least one of Mn or Zn. b is a value of greater than or equal to 0 and less than or equal to 0.25.

A thermoelectric conversion material has a La.sub.2O.sub.3-type crystal structure and is of n-type. The thermoelectric conversion material has a composition represented by Mg.sub.3+m-a-bA.sub.aB.sub.bD.sub.2-e-fE.sub.eF.sub.f. D is at least one of Sb or Bi. E is at least one of P or As. m is a value of greater than or equal to −0.1 and less than or equal to 0.4. e is a value of greater than or equal to 0.001 and less than or equal to 0.25. A is at least one of Y, Sc, La, or Ce. F is at least one of Se or Te. a and f are values that satisfy a condition of 0.0001≤a+f≤0.06. B is at least one of Mn or Zn. b is a value of greater than or equal to 0 and less than or equal to 0.25.

A method includes applying a material coating on a surface of a machine component using a thermal spray, wherein the material coating is formed from a combination of a hardfacing material and aluminum-containing particles. The method also includes thermally treating the material coating to generate an oxide layer comprising aluminum from the aluminum-containing particles, wherein the oxide layer is configured to reduce oxidation of the hardfacing material.

A method is provided in which a lower box comprising a base, walls that surround the base and an open side, and an upper box comprising a cover, walls that surround the cover and an open side are provided. One or more objects are arranged on the base of the lower box. The object(s) are covered with the upper box such that the open side of the upper is oriented towards the base of the box, the walls of the upper box are arranged on the base of the lower box and a gap is formed between the walls of the upper box and the walls of the lower box. A powder material is introduced into the gap in order to form an assembly having an interior. The powder material provides a mechanical obstacle to gas exchange between the interior and the environment. This assembly is then heat treated.

A system for manufacturing a part, the system comprising a power source, a rectifier, an electrical conduit, and a framework. The power source is configured to generate a high frequency, high current electrical signal. The rectifier is configured to convert the electrical signal to a direct current electrical signal. The electrical conduit is configured to carry the electrical signal. The framework is formed of electrically resistive metal having a relatively high melting point and is connected to the electrical conduit and at least partially encased in a powdered metal having a melting point lower than the melting point of the framework so that transmission of the electrical signal through the framework transitions at least some of the powdered metal into its molten state so that at least some of the molten metal cooled into its solidified state forms at least a portion of the part.

A system for manufacturing a part, the system comprising a power source, a rectifier, an electrical conduit, and a framework. The power source is configured to generate a high frequency, high current electrical signal. The rectifier is configured to convert the electrical signal to a direct current electrical signal. The electrical conduit is configured to carry the electrical signal. The framework is formed of electrically resistive metal having a relatively high melting point and is connected to the electrical conduit and at least partially encased in a powdered metal having a melting point lower than the melting point of the framework so that transmission of the electrical signal through the framework transitions at least some of the powdered metal into its molten state so that at least some of the molten metal cooled into its solidified state forms at least a portion of the part.

A mixed powder for powder metallurgy comprises: an iron-based powder; and a lubricant, wherein the lubricant consists of a low-melting-point lubricant having a melting point of 86° C. or less and a high-melting-point lubricant having a melting point of more than 86° C., the low-melting-point lubricant has at least one of an amide group, an ester group, an amino group, and a carboxyl group, a ratio R1 of the low-melting-point lubricant to whole of the lubricant is 5 mass % or more and less than 90 mass %, a ratio R2 of a mass of a free lubricant to a mass of a binding lubricant is 0 or more and 15 or less, and an amount R3 of the low-melting-point lubricant contained as the free lubricant is less than 0.10 parts by mass with respect to 100 parts by mass of the iron-based powder.

A Sm—Fe—N-based rare earth magnet more resistant to demagnetization than ever before, particularly at high temperatures, and a production method thereof are provided.

The present disclosure presents a production method of a rare earth magnet, including mixing a SmFeN magnetic powder and a modifier powder to obtain a mixed powder, compression-molding the mixed powder in a magnetic field to obtain a magnetic-field molded body, pressure-sintering the magnetic-field molded body to obtain a sintered body, and heat-treating the sintered body, and a rare earth magnet obtained by the method. D.sub.50 of the magnetic powder is 1.50 μm or more and 3.00 μm or less, the content ratio of the zinc component in the modifier powder is 6 mass % or more and 30 mass % or less, and the heat treatment temperature is 350° C. or more and 410° C. or less.

Disclosed herein are metal matrix composites and methods of making and use thereof. For example, disclosed herein are methods of making a metal matrix composite comprising a metal matrix reinforced by a high entropy alloy. The methods comprise mixing a first powder and a second powder to form a powder mixture, wherein the first powder comprises a plurality of particles comprising a metal and the second powder comprises a plurality of particles comprising a high entropy alloy. The methods further comprise compacting the powder mixture to form a pellet and adding the pellet to a molten metal, the molten metal comprising the metal in a molten state, thereby melting the pellet to form a molten mixture. The methods further comprise subjecting the molten mixture to an ultrasonic treatment and casting the ultrasonic treated mixture to form the metal matrix composite.

Disclosed herein are metal matrix composites and methods of making and use thereof. For example, disclosed herein are methods of making a metal matrix composite comprising a metal matrix reinforced by a high entropy alloy. The methods comprise mixing a first powder and a second powder to form a powder mixture, wherein the first powder comprises a plurality of particles comprising a metal and the second powder comprises a plurality of particles comprising a high entropy alloy. The methods further comprise compacting the powder mixture to form a pellet and adding the pellet to a molten metal, the molten metal comprising the metal in a molten state, thereby melting the pellet to form a molten mixture. The methods further comprise subjecting the molten mixture to an ultrasonic treatment and casting the ultrasonic treated mixture to form the metal matrix composite.