Resettable gears and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-11873548-B2
Application number	US-202117486998-A
Country	US
Kind code	B2
Filing date	Sep 28, 2021
Priority date	Sep 28, 2020
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

Disclosed is a gear including a resettable metallic glass. The gear of the present disclosure includes, as a base material, a resettable metallic glass, wherein the resettable metallic glass includes at least one metal element selected from each of (a) the group consisting of Ti, Zr, and Hf and (b) the group consisting of Fe, Co, Ni, Cu, and Zn, and further includes at least one metal element to maximize the complexity in the thermodynamic enthalpy of mixing among constituent elements, thereby including multiple resetting cores in various atomic-scale cluster forms in an amorphous matrix, leading to a structure with maximized structural complexity.

First claim

What is claimed is:

1. A resettable gear comprising a resettable metallic glass,
wherein the resettable metallic glass comprises:
at least one metal element selected from (a) a group consisting of Ti, Zr, and Hf;
at least one metal element selected from (b) a group consisting of Fe, Co, Ni, Cu, and Zn;
at least one element selected from (c) a group consisting of Sc, Y, La, Pr, Nd, Sm, Gd, Dy, Ho, and Er, at 5 at. % or less, thereby having a complex structure with multiple atomic-scale cluster resetting cores in an amorphous matrix; and
at least one element selected from (d) a group consisting of Be, B, Al, V, Mn, Ga, Ag, In, Sn, Pb, and Bi, at 15 at. % or less, thereby having a complex structure with multiple atomic-scale cluster resetting cores in the amorphous matrix for improvement of structural complexity thereof,
wherein a ratio of the element of the group (a) to the element of the group (b) being 15 to 66.6 at. % to form an amorphous structure, and
wherein the resettable metallic glass, for the improvement of structural complexity thereof, further comprises at least one species of element selected from (e) a group consisting of Nb, Mo, Ta, and W, or (f) a group consisting of C, N, Si, P, Ge, Pd, Pt, and Au, at 5 at. % or less relative to the total alloying elements.

2. The resettable gear of claim 1 , wherein glass-forming ability of the resettable metallic glass is 1 mm or more.

3. The resettable gear of claim 1 , wherein strength of the resettable metallic glass is 1 GPa or more.

4. The resettable gear of claim 1 , wherein modulus of elastic deformation of the resettable metallic glass is 1.5% or more.

5. The resettable gear of claim 1 , wherein resilience of the resettable metallic glass is 5 MJ/m3 or more.

Assignees

• Seoul Nat Univ R&Db Foundation
• Seoul Nat Univ R&Db Foundation

Inventors

• Park Eun Soo
• Yoo Geun Hee
• Yoon Kook Noh
• Kim Ji Young
• Ryu Wook Ha

Classifications

• C22C45/10 Primary

  with molybdenum, tungsten, niobium, tantalum, titanium, or zirconium {or Hf} as the major constituent · CPC title

• B22D19/0036

  gears · CPC title

• B22D21/022 Primary

  Casting heavy metals, with exceedingly high melting points, i.e. more than 1600 degrees C, e.g. W 3380 degrees C, Ta 3000 degrees C, Mo 2620 degrees C, Zr 1860 degrees C, Cr 1765 degrees C, V 1715 degrees C · CPC title

• F16H49/001

  Wave gearings, e.g. harmonic drive transmissions · CPC title

• F16H2049/003

  Features of the flexsplines therefor · CPC title