Mnal alloy, particles thereof, and method for production

Patent metadata

Field	Value
Publication number	US-2023249248-A1
Application number	US-202318164038-A
Country	US
Kind code	A1
Filing date	Feb 3, 2023
Priority date	Sep 4, 2017
Publication date	Aug 10, 2023
Grant date	—

Abstract

An alloy represented by the formula (MnxAly)Cz, the alloy being aluminum (Al), manganese (Mn), and carbon (C), and optionally unavoidable impurities; wherein x=56.0 to 59.0 y=41.0 to 44.0 x+y=100, and z=1.5 to 2.4. The alloy is highly suitable for forming the ε and ε phase in high purity and high microstructural homogeneity. A method for processing an alloy of formula (Mnx′Aly′)Cz′, wherein x′=52.0 to 59.0, y′=41.0 to 48.0, x′+y′=100, and z′=0.1 to 3.0, the process including providing the raw materials of the alloy, melting the raw materials, and forming particles of the alloy by gas atomization of the molten alloy.

First claim

1 . A method for producing or treating an alloy having a composition of formula (II)
(Mn x′ Al y′ )C z′   (II)
wherein
x′=52.0 to 59.0
y′=41.0 to 48.0
x′+y′=100, and
z′=0.1 to 3.0
wherein the ratio of x′ to z′ (x′/z′) is in the range of 26 to 30, the alloy consisting of Mn, Al, C, and optionally unavoidable impurities, the process comprising: a. optionally, providing the raw materials of the alloy, melting the raw materials, and forming particles of the alloy by gas atomization of the molten alloy; b. optionally, performing a heat treatment on the alloy at 900-1200° C.; c. milling the alloy represented by formula (II) at a temperature of −20° C. or below and d. performing a heat treatment on particles of the alloy represented by formula (II) at a temperature of 900 to 1000° C. for a time of 0.5 to 20 minutes, wherein the milling c. is performed prior to the heat treatment d.

2 . The method according to claim 1 , wherein
x′=56.0 to 59.0 y′=41.0 to 448.0 x′+y′=100, and z′=1.5 to 2.4.

3 . The method according to claim 1 , wherein z′=1.7 to 2.2.

4 . The method according to claim 1 , wherein x′=56.5 to 58.5 and y′=41.5 to 43.5.

5 . The method according to claim 1 , wherein x′=57.0 to 58.0 and y′=42.0 to 43.0.

6 . The method according to claim 1 , wherein the ratio of x′ to z′ (x′/z′) is in the range of 27.5 to 30.

7 . The method according to claim 1 , wherein the alloy has a ε phase content of 90% by mass or more.

8 . The method according to claim 1 , wherein all of steps a. to d. are performed.

9 . The method according to claim 1 , wherein step a. is performed.

10 . The method according to claim 1 , wherein step c. is performed at a temperature of −100° C. or lower.

11 . The method according to claim 1 , wherein step c. is performed at a temperature of −150° C. or lower.

12 . The method according to claim 1 , wherein step d. is performed for 5 to 15 minutes.

13 . An alloy obtainable by the method according to claim 1 .

14 . The alloy according to claim 13 , which has a content of the τ phase of 80% or more.

15 . The alloy according to claim 13 , which has a saturation magnetization Ms of 100 emu/g or more.

16 . The alloy according to claim 13 , which is in the form of particles having a median particle diameter D50, as determined by a light scattering method, of 5000 μm or less.

17 . The alloy according to claim 13 , which is in the form of particles having a median particle diameter D50, as determined by a light scattering method, of 200 μm or less.

18 . The alloy according to claim 13 , which is in the form of particles having a median particle diameter D50, as determined by a light scattering method, of 100 μm or less.

19 . The alloy according to claim 13 , wherein the alloy is in the form of particles.

20 . The alloy according to claim 13 , wherein the alloy has a saturation magnetization Ms of 100 emu/g or more.

Assignees

• Hoeganaes Ab Publ

Inventors

• Fang Hailiang
• Sahlberg Martin Häggblad
• Skårman Björn

Classifications

• C22C1/1084

  by mechanical alloying (blending, milling) · CPC title

• C22C1/1042

  by atomising · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• B22F1/05 Primary

  Metallic powder characterised by the size or surface area of the particles · CPC title