Components molded with moldable carbon fiber and methods of manufacturing thereof

Patent metadata

Field	Value
Publication number	US-10427349-B2
Application number	US-201615274280-A
Country	US
Kind code	B2
Filing date	Sep 23, 2016
Priority date	Sep 23, 2016
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

In various aspects, the present disclosure provides a structural component. The structural component includes a body defining at least one hollow region. The body includes a carbon fiber composite including a plurality of substantially aligned continuous carbon fibers. The plurality of substantially aligned carbon fibers defines a major axis and a second axis perpendicular to the major axis. The plurality of substantially aligned continuous carbon fibers includes a plurality of discrete termination points staggered with respect to the second axis. Methods of making such structural components, including by blow molding and compression molding are also provided.

First claim

What is claimed is:

1. A structural component comprising:
a body defining at least one hollow region, wherein the body comprises a carbon fiber composite comprising a plurality of substantially aligned continuous carbon fibers defining a major axis and a second axis perpendicular to the major axis, wherein the plurality of substantially aligned continuous carbon fibers comprise a plurality of discrete termination points staggered with respect to the second axis, wherein the plurality of substantially aligned continuous carbon fibers comprises one or more continuous carbon fibers having a length of greater than or equal to about 2 inches, wherein the one or more continuous carbon fibers comprise a plurality of discrete weak regions along the length of the one or more continuous carbon fibers, wherein the plurality of discrete weak regions comprise a composition that has an ultimate tensile strength that is at least 50% less than the ultimate tensile strength of the remainder of the length of the one or more continuous carbon fibers.

2. The structural component of claim 1 , wherein the plurality of substantially aligned continuous carbon fibers further comprises a first plurality of carbon fibers having a first distinct length and a second plurality of carbon fibers having a second distinct length.

3. The structural component of claim 1 , wherein the structural component is selected from the group consisting of: a hood, a pillar, a panel, a structural panel, a door panel, a door component, an interior floor, a floor pan, a roof, an exterior surface, an underbody shield, a wheel component, a storage area, a glove box, a console box, a trunk, a trunk floor, a truck bed, a lamp pocket, a shock tower cap, a control arm, a suspension component, a crush can, a bumper, a structural front rail, a structural frame, a cross car beam, an undercarriage component, a drivetrain component, and combinations thereof.

4. The structural component of claim 1 , wherein the one or more continuous carbon fibers comprise a first composition and the plurality of discrete weak regions comprise a second composition, the first composition having a first weight average molecular weight and the second composition having a second weight average molecular weight, the second weight average molecular weight being less than the first weight average molecular weight.

5. The structural component of claim 4 , wherein the first composition includes polyacrylonitrile (PAN) and the second composition includes PAN.

6. The structural component of claim 1 , wherein the one or more continuous carbon fibers comprise a first composition and the plurality of discrete weak regions comprise a second composition, the first composition comprising a mesophase pitch precursor, and the second composition comprising an isotropic pitch precursor.

7. The structural component of claim 1 , wherein the plurality of substantially aligned continuous carbon fibers is a primary plurality of substantially aligned continuous carbon fibers and the carbon fiber composite further comprises a secondary plurality of substantially aligned continuous carbon fibers, the secondary plurality of substantially aligned continuous carbon fibers extended non-parallel to the major axis.

8. The structural component of claim 7 , wherein the secondary plurality of substantially aligned continuous carbon fibers extend substantially perpendicular to the primary plurality of substantially aligned continuous carbon fibers.

9. The structural component of claim 1 , wherein the carbon fiber composite has an ultimate tensile strength of greater than or equal to about 700 MPa.

10. A structural component comprising:
a body defining at least one hollow region, wherein the body comprises a carbon fiber composite comprising a plurality of substantially aligned continuous carbon fibers defining a major axis and a second axis perpendicular to the major axis, wherein the plurality of substantially aligned continuous carbon fibers comprise a plurality of discrete termination points staggered with respect to the second axis, wherein the plurality of substantially aligned continuous carbon fibers comprises one or more continuous carbon fibers having a length of greater than or equal to about 2 inches, wherein the one or more continuous carbon fibers comprise a plurality of discrete weak regions along the length of the one or more continuous carbon fibers, wherein the plurality of discrete weak regions comprise a composition that has an ultimate tensile strength that is at least 50% less than the ultimate tensile strength of the remainder of the length of the one or more continuous carbon fibers, and the carbon fiber composite has an ultimate tensile strength of greater than or equal to about 500 MPa.

11. A method of producing a structural component having at least one interior cavity, the method comprising:
placing a parison comprising a moldable carbon fiber precursor material disposed around a mandrel in a die, wherein the moldable carbon fiber precursor material comprises a polymer precursor and a plurality of substantially aligned continuous carbon fibers defining a major axis and a second axis perpendicular to the major axis, wherein the plurality of substantially aligned continuous carbon fibers comprise a plurality of discrete termination points staggered with respect to the second axis, wherein the plurality of substantially aligned continuous carbon fibers comprises one or more continuous carbon fibers having a length of greater than or equal to about 2 inches, wherein the one or more continuous carbon fibers comprise a plurality of discrete weak regions along the length of the one or more continuous carbon fibers, wherein the plurality of discrete weak regions comprise a composition that has an ultimate tensile strength that is at least 50% less than the ultimate tensile strength of the remainder of the length of the one or more continuous carbon fibers;
blow molding the parison to create the structural component; and
crosslinking or solidifying the polymer precursor to form the structural component.

12. The method of claim 11 , wherein the moldable carbon fiber precursor material stretches by greater than or equal to about 10% with respect to an initial surface area of the moldable carbon fiber precursor during blow molding.

13. The method of claim 12 , wherein the moldable carbon fiber precursor material stretches by greater than or equal to about 200% with respect to an initial surface area of the moldable carbon fiber precursor material during blow molding.

14. The method of claim 11 , further comprising wrapping the moldable carbon fiber precursor material around the mandrel so at least a portion of an outer surface of the mandrel is disposed inside the moldable carbon fiber precursor material.

15. The method of claim 11 , further comprising winding a filament comprising a moldable carbon fiber coated in the polymer precursor around an outer surface of the mandrel to form the parison.

16. The method of claim 11 , further comprising heating the die to a temperature greater than or equal to about 50° C. and less than or equal to about 200° C.

17. The method of claim 11 , further comprising injecting a fluid into a cavity of the mandrel at about 120° C. and about 7 MPa, wherein the fluid is selected from the group consisting of: water, air, and oil.

18. The method of claim 11 , wherein the mandrel comprises a polymeric material selected from the group consisting of: polyethylene, polypropylene, polyethylene terephthalate, nylon, and shape memory epoxy resin.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Kia Hamid G
• Zhao Selina X

Classifications

• B29K2105/08

  of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns · CPC title

• B29C2049/4658

  oil · CPC title

• B29C2049/4655

  water · CPC title

• B29C43/52

  Heating or cooling · CPC title

• B29C43/02

  of articles of definite length, i.e. discrete articles {(B29C35/0227 takes precedence)} · CPC title