Brake disc assembly
In some examples, a brake disc assembly including a single continuous core portion defining a core of the brake disc assembly; and a friction portion adjacent the core portion. The friction portion defines the friction surface of the brake disc assembly during a braking operation. The friction portion includes a carbon composite material. The core portion includes a core material that is not a carbon composite material, and the core portion is configured as a heat sink for the brake disc assembly for heat generated during the braking operation.
1. A brake disc assembly comprising:
a single continuous core portion defining a core of the brake disc assembly; and
a friction portion adjacent the core portion, the friction portion defining a friction surface of the brake disc assembly during a braking operation, wherein the friction portion comprises a carbon-carbon composite material, wherein the core portion comprises a core material that is not a carbon-carbon composite material, and wherein the core portion is configured as a heat sink for the brake disc assembly for heat generated during the braking operation,
wherein the core portion is coupled to the friction portion via a plurality of boss assemblies, each boss assembly being positioned within a corresponding aperture in the core portion such that protruding portions protrude out of a surface plane of the core portion and the protruding portions mate with a corresponding grooved pocket in an opposing surface of the friction portion.
2. The assembly of claim 1 , wherein the core material comprises at least one of a steel, tungsten carbide, boron nitride, boron carbide, silicon nitride, or silicon carbide.
3. The assembly of claim 1 , wherein the core material comprises a titanium or titanium alloy.
4. The assembly of claim 1 , wherein the core material comprises titanium alloyed with at least one of nickel or aluminum.
5. The assembly of claim 1 , wherein the core material has a volumetric specific heat capacity of at least about 1.5 Joules/cubic centimeter*Kelvin.
6. The assembly of claim 1 , wherein the core portion has a thermal conductivity that is greater than a thermal conductivity of the friction portion.
7. The assembly of claim 1 , wherein the brake disc assembly defines an annular disc, wherein the core portion and the friction portion each extend from an outer diameter to an inner diameter of the annular disc.
8. The assembly of claim 1 , wherein the friction portion comprises a first friction portion, further comprising a second friction portion, wherein the core portion is between the first friction portion and the second friction portion, and wherein the first friction portion defines a first outer surface of the assembly and the second friction portion defines a second outer surface of the assembly.
9. The assembly of claim 1 , wherein the core portion defines a first volume and the friction portion defines a second volume, wherein the ratio of the first volume to the second volume is at least 0.1.
10. The assembly of claim 1 , wherein the brake disc assembly comprises an annular disc pad used in an aircraft braking assembly.
11. The assembly of claim 1 , wherein the core portion defines a portion of an outer surface of the brake disc assembly.
12. The assembly of claim 1 , wherein the protruding portions of the plurality of boss assemblies are larger than the corresponding apertures in the core portion.
13. A method for forming a brake disc assembly, the method comprising
positioning a single continuous core portion adjacent to a friction portion with a plurality of boss assemblies between the core portion and the friction portion, each boss assembly being positioned within a corresponding aperture in the single continuous core portion such that protruding portions protrude out of a surface plane of the core portion and the protruding portions mate with a corresponding grooved pocket in an opposing surface of the friction portion, wherein the core portion defines a core of the brake disc assembly, wherein the friction portion defines a friction surface of the brake disc assembly during a braking operation, wherein the friction portion comprises a carbon-carbon composite material, wherein the core portion comprises a core material that is not a carbon-carbon composite material, and wherein the core portion is configured as a heat sink for the brake disc assembly for heat generated during the braking operation.
14. The method of claim 13 , wherein the core material comprises at least one of a steel, tungsten carbide, boron nitride, boron carbide, silicon nitride, or silicon carbide.
15. The method of claim 13 , wherein the core material comprises a titanium or titanium alloy.
16. The method of claim 13 , wherein the core material comprises titanium alloyed with at least one of nickel or aluminum.
17. The method of claim 13 , wherein the core material has a volumetric specific heat capacity of at least about 1.5 Joules/cubic centimeter*Kelvin.
18. The method of claim 13 , wherein the core portion has a thermal conductivity that is greater than a thermal conductivity of the friction portion.
19. The method of claim 13 , wherein the brake disc assembly defines an annular disc, wherein the core portion and the friction portion each extend from an outer diameter to an inner diameter of the annular disc.
20. The method of claim 13 , wherein the friction portion comprises a first friction portion, the method further comprising
placing a second friction portion adjacent the single continuous core portion on a side opposite the first friction portion, wherein the core portion is between the first friction portion and the second friction portion, and wherein the first friction portion defines a first outer surface of the assembly and the second friction portion defines a second outer surface of the assembly.