Thermoplastic carbon fiber laminate with a randomly oriented fiber core layer

Patent metadata

Field	Value
Publication number	US-11230090-B2
Application number	US-201916527311-A
Country	US
Kind code	B2
Filing date	Jul 31, 2019
Priority date	Jul 31, 2019
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

In one or more embodiments, one or more systems, methods, and/or processes may place a first outer layer, a core layer, and a second outer layer in a mold; and may heat the mold to at least thirty degrees Celsius above a glass transition temperature (Tg) for a period of time. In one or more embodiments, the polycarbonate fibers may be between eight and ten deniers per filament. In one or more embodiments, the Tg may be no more than 105 degrees Celsius. In one or more embodiments, the one or more systems, methods, and/or processes may further allow the first outer layer, the core layer, and the second outer layer to cool below the Tg, after the period of time. For example, after the layers cool, a shear modulus of the core layer may be in a range of 0.9868 megapounds per square inch (msi) to 2.2730 msi.

First claim

What is claimed is:

1. A method of manufacturing a carbon fiber composite material, comprising:
placing a first outer layer, a core layer, and a second outer layer in a mold, wherein the core layer includes a nonwoven material that includes carbon fibers and polycarbonate fibers; and
heating the mold to at least thirty degrees Celsius above a glass transition temperature (Tg) of the polycarbonate fibers for a period of time;
wherein the first outer layer includes a first thermoplastic matrix reinforced with first directional carbon fibers;
wherein the carbon fibers of the core layer are 30% to 40% by weight of the nonwoven material; and
wherein the second outer layer includes a second thermoplastic matrix reinforced with second directional carbon fibers.

2. The method of claim 1 , wherein the polycarbonate fibers are between eight and ten deniers per filament.

3. The method of claim 1 , wherein the Tg is no more than 105 degrees Celsius.

4. The method of claim 1 ,
wherein a mechanical panel of the carbon fiber composite material has a total thickness P; and
wherein the mechanical panel has a stiffness corresponding to a deflection of the mechanical panel of less than 1% of a maximum span of the mechanical panel under a load of 100N force at a center of the mechanical panel.

5. The method of claim 1 , wherein the first outer layer is a carbon fiber fabric.

6. The method of claim 5 , wherein the carbon fiber fabric includes a twill pattern.

7. The method of claim 1 , further comprising:
after the period of time, allowing the first outer layer, the core layer, and the second outer layer to cool below the Tg;
wherein after the allowing the first outer layer, the core layer, and the second outer layer to cool below the Tg, a shear modulus of the core layer is in a range of 0.9868 megapounds per square inch (msi) to 2.2730 msi.

8. A carbon fiber composite material by a process, comprising:
placing a first outer layer, a core layer, and a second outer layer in a mold, wherein the core layer includes a nonwoven material that includes carbon fibers and polycarbonate fibers; and
heating the mold to at least thirty degrees Celsius above a glass transition temperature (Tg) of the polycarbonate fibers for a period of time;
wherein the first outer layer includes a first thermoplastic matrix reinforced with first directional carbon fibers;
wherein the carbon fibers of the core layer are 30% to 40% by weight of the nonwoven material; and
wherein the second outer layer includes a second thermoplastic matrix reinforced with second directional carbon fibers.

9. The carbon fiber composite material of claim 8 , wherein the polycarbonate fibers are between eight and ten deniers per filament.

10. The carbon fiber composite material of claim 8 , wherein the Tg is no more than 105 degrees Celsius.

11. The carbon fiber composite material of claim 8 ,
wherein a mechanical panel of the carbon fiber composite material has a total thickness P; and
wherein the mechanical panel has a stiffness corresponding to a deflection of the mechanical panel of less than 1% of a maximum span of the mechanical panel under a load of 100N force at a center of the mechanical panel.

12. The carbon fiber composite material of claim 8 , wherein the first outer layer is a carbon fiber fabric.

13. The carbon fiber composite material of claim 12 , wherein the carbon fiber fabric includes a twill pattern.

14. The carbon fiber composite material of claim 8 ,
wherein the process further comprises:
after the period of time, allowing the first outer layer, the core layer, and the second outer layer to cool below the Tg; and

wherein after the allowing the first outer layer, the core layer, and the second outer layer to cool below the Tg, a shear modulus of the core layer is in a range of 0.9868 megapounds per square inch (msi) to 2.2730 msi.

Assignees

• Dell Products Lp

Inventors

• Abbatiello Nicholas Donald
• Williams David Wheeler

Classifications

• B32B5/26 Primary

  another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)} · CPC title

• B29C65/70

  by moulding (using a particular moulding technique, see the relevant technique {, e.g. by injection B29C45/14467}) · CPC title

• B29C70/465

  and impregnating by melting a solid material, e.g. sheets, powders of fibres · CPC title

• B29C43/20

  Making multilayered or multicoloured articles {(B29C43/14 takes precedence)} · CPC title

• B32B2307/718

  Weight, e.g. weight per square meter · CPC title