Corrosion-induced shape memory fiber, preparation method and application thereof

Patent metadata

Field	Value
Publication number	US-2020149278-A1
Application number	US-201916683282-A
Country	US
Kind code	A1
Filing date	Nov 14, 2019
Priority date	Nov 14, 2018
Publication date	May 14, 2020
Grant date	—

Abstract

The present invention relates to a corrosion-induced shape memory fiber, a preparation method and application thereof. The corrosion-induced shape memory fiber is composed of a core fiber and/or a core fiber with a corrosion-resistant coating, and a corrodible coating; the core fiber and/or the core fiber with the corrosion-resistant coating are in a tensile stress state along the length of the corrosion-induced shape memory fiber; the corrodible coating is in a compressive stress state along the length of the corrosion-induced shape memory fiber; the core fiber and/or the core fiber with the corrosion-resistant coating and the corrodible coating are in a tensile-compressive equilibrium state along the length of the corrosion-induced shape memory fiber; and the corrodible coating is coated outside the core fiber and/or the core fiber with the corrosion-resistant coating.

First claim

What is claimed is:

1 . A corrosion-induced shape memory fiber, wherein the corrosion-induced shape memory fiber is composed of a core fiber and/or a core fiber with a corrosion-resistant coating, and a corrodible coating; the core fiber and/or the core fiber with the corrosion-resistant coating are in a tensile stress state along the length of the corrosion-induced shape memory fiber; the corrodible coating is in a compressive stress state along the length of the corrosion-induced shape memory fiber; the core fiber and/or the core fiber with the corrosion-resistant coating and the corrodible coating are in a tensile-compressive equilibrium state along the length of the corrosion-induced shape memory fiber; and the corrodible coating is coated outside the core fiber and/or the core fiber with the corrosion-resistant coating.

2 . The corrosion-induced shape memory fiber according to claim 1 , wherein:
in an equivalent corrosive environment, the corrodible coating has a higher corrosion rate than the core fiber; and/or, in an equivalent corrosive environment, the corrodible coating has the higher corrosion rate than the core fiber with the corrosion-resistant coating.

3 . The corrosion-induced shape memory fiber according to claim 1 , wherein the corrosion-induced shape memory fiber comprises the core fiber and the corrodible coating, and the core fiber is partially or entirely coated with the corrodible coating; or
the corrosion-induced shape memory fiber comprises the corrosion-resistant coating, the core fiber, and the corrodible coating; the core fiber is partially or entirely coated with the corrosion-resistant coating; when the core fiber is partially or entirely coated with the corrosion-resistant coating, a obtained material is defined as A; the surface of the A is partially or entirely coated with the corrodible coating; or the corrosion-induced shape memory fiber comprises the core fiber, the corrodible coating, and the corrosion-resistant coating; the core fiber is coated with the corrodible coating; the corrodible coating is partially coated with the corrosion-resistant coating; or the corrosion-induced shape memory fiber comprises the core fiber and the corrodible coating; the core fiber is partially or entirely coated with the corrodible coating; a partial position outside the core fiber comprises an end portion of the core fiber; when the end portion of the core fiber is coated with the corrodible coating, the corrodible coating at the end portion is also coated with the corrosion-resistant coating; or the corrosion-induced shape memory fiber comprises the corrosion-resistant coating, the core fiber, and the corrodible coating; the core fiber is partially or entirely coated with the corrosion-resistant coating; when the core fiber is partially or entirely coated with the corrosion-resistant coating, a obtained material is defined as A; the surface of the A is partially or entirely coated with the corrodible coating, and when an end portion of the A is coated with the corrodible coating, the corrodible coating at the end portion is also coated with the corrosion-resistant coating; wherein the core fiber and/or the core fiber with the corrosion-resistant coating are in the tensile stress state along the length of the fiber; the corrodible coating is in the compressive stress state along the length of the fiber; in the equivalent corrosive environment, the corrodible coating has the higher corrosion rate than the core fiber; and/or, in the equivalent corrosive environment, the corrodible coating has the higher corrosion rate than the core fiber with the corrosion-resistant coating.

4 . The corrosion-induced shape memory fiber according to claim 1 , wherein the core fiber is selected from at least one of an inorganic fiber and a polymer fiber; and the core fiber has an equivalent diameter of 20 mm or less.

5 . The corrosion-induced shape memory fiber according to claim 1 , wherein the core fiber has the equivalent diameter of 5 mm or less.

6 . The corrosion-induced shape memory fiber according to claim 4 , wherein:
the inorganic fiber is selected from at least one of carbon fiber, glass fiber, mineral fiber, basalt fiber, ceramic fiber, and metal fiber; the metal fiber is selected from at least one of steel fiber, plated M steel fiber, stainless steel fiber, copper alloy fiber, titanium alloy fiber, and nickel alloy fiber; the M is selected from at least one of copper, nickel, chromium, tin, cadmium, and silver elements; the polymer fiber is selected from at least one of polypropylene fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber, polyethylene fiber, and aramid fiber.

7 . The corrosion-induced shape memory fiber according to claim 1 , wherein a material of the corrosion-resistant coating is selected from at least one of copper, nickel, chromium, cadmium, silver, and gold elements.

8 . A preparation method of the corrosion-induced shape memory fiber according to claim 1 , comprising:
applying a tensile force to a core fiber or a core fiber with a corrosion-resistant coating; then preparing a corrodible coating on a set region of the surface of the core fiber; removing the tensile force to obtain a sample, wherein the applied tensile force is 10% to 90% of the bearing capacity of the core fiber or the core fiber with the corrosion-resistant coating; and applying the tensile force to a stranded fiber composed of a plurality of core fibers.

9 . The preparation method of the corrosion-induced shape memory fiber according to claim 8 , wherein in the entire corrosion-induced shape memory fiber, in order to maximize a pre-stress applied to a matrix by the corrosion-induced shape memory fiber, a optimized acquisition method is:
in a case where a cross sectional area of the corrosion-induced shape memory fiber is definite, the pre-stress stored by the corrosion-induced shape memory fiber is closely related to a volume fraction V f of the core fiber, and a axial force F stored by the core fiber is:

F
=

σ
f
p



A
f

=

E
c



V
c



σ
o



A
f

E
c



V
c

+

Assignees

• Wang Ziguo
• Univ Qingdao Technology

Inventors

• Wang Ziguo
• Sun Yuyan
• Wang Ziliang

Classifications

• C04B2111/26

  Corrosion of reinforcement resistance · CPC title

• C04B14/48

  Metal · CPC title

• E04C5/073 Primary

  Discrete reinforcing elements, e.g. fibres · CPC title

• C04B14/42

  Glass · CPC title

• C04B14/386

  Carbon (carbon nanotubes C04B14/026) · CPC title