Abstract:
A carbon-carbon composite material is made by providing an open-celled carbon foam preform, and densifying the preform with carbonaceous material. The open-celled carbon foam prefrom may be oxygen stabilized prior to carbonization, and the foam preform densified by CVD, HIP, PIC, VPI, pitch and resin injection, or any combination thereof. The carbon-carbon composite material can be heat treated to provide thermal management materials, structural materials, or a friction material for use in a brake or clutch mechanism.
Abstract:
Carbon-carbon composite parts (1, 2) are joined with minimum surface preparation. A reactive-bonding joint interlayer (5) having thickness greater than 1 mil is formed of fine particles of carbide-forming metallic ingredients and carbon. The joint layer (5) is sandwiched between the two carbon-carbon parts (1, 2) to be joined and the assembly is heated under a compressive pressure to a temperature sufficient to complete the bonding reaction. No special surface preparation is required for the carbon-carbon parts due to the nature of the reactive-bonding. The mechanical properties of the joint are assured by selecting the metal-carbon ingredients so that thermal expansion mismatch is minimized. Shear strength exhibited by the resulting joints is greater than the interlaminar shear strength of the carbon-carbon composite material.
Abstract:
Porous solid bodies, especially carbon bodies, are densified by chemical vapor deposition by establishing a thermal gradient within the body, thermally decomposing a gaseous precursor to deposit an electrically and thermally conductive deposit (e.g. carbon) within the body, and shifting the thermal gradient toward the lower temperature zone as deposition proceeds, by means of induction heating.
Abstract:
A corrosion resistant coated fuel cell plate and method of making the same are embodied in a metal plate (400) provided with a graphite emulsion coating (402) and then a layer (406) of graphite foil which is pressed over the coating (402). The graphite emulsion (402) bonds the graphite foil (406) to the metal plate (400) and seals fine scale porosities (410) in the graphite foil (406). Flow fields (414) are formed by stamping the coated fuel cell plate.
Abstract:
A carbon-carbon composite material is made by providing an open-celled carbon foam preform, and densifying the preform with carbonaceous material. The open-celled carbon foam prefrom may be oxygen stabilized prior to carbonization, and the foam preform densified by CVD, HIP, PIC, VPI, pitch and resin injection, or any combination thereof. The carbon-carbon composite material can be heat treated to provide thermal management materials, structural materials, or a friction material for use in a brake or clutch mechanism.
Abstract:
A corrosion resistant coated fuel cell plate and method of making the same are embodied in a metal plate (400) provided with a graphite emulsion coating (402) and then a layer (406) of graphite foil which is pressed over the coating (402). The graphite emulsion (402) bonds the graphite foil (406) to the metal plate (400) and seals fine scale porosities (410) in the graphite foil (406). Flow fields (414) are formed by stamping the coated fuel cell plate.
Abstract:
Carbon-carbon composite parts (1, 2) are joined with minimum surface preparation. A reactive-bonding joint interlayer (5) having thickness greater than 1 mil is formed of fine particles of carbide-forming metallic ingredients and carbon. The joint layer (5) is sandwiched between the two carbon-carbon parts (1, 2) to be joined and the assembly is heated under a compressive pressure to a temperature sufficient to complete the bonding reaction. No special surface preparation is required for the carbon-carbon parts due to the nature of the reactive-bonding. The mechanical properties of the joint are assured by selecting the metal-carbon ingredients so that thermal expansion mismatch is minimized. Shear strength exhibited by the resulting joints is greater than the interlaminar shear strength of the carbon-carbon composite material.
Abstract:
Porous solid bodies, especially carbon bodies, are densified by chemical vapor deposition by establishing a thermal gradient within the body, thermally decomposing a gaseous precursor to deposit an electrically and thermally conductive deposit (e.g. carbon) within the body, and shifting the thermal gradient toward the lower temperature zone as deposition proceeds, by means of induction heating.