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    Carbon Carbon Composites

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    1 : Galgotias College of Engineering and Technology Department of Mechanical Engineering Carbon-Carbon Composites A Report of a Seminar delivered by Gaurav Pal Sharma in Partial Fulfillment of Degree Requirements as per UPTU Syllabus for the award of Bachelor of Technology (Mechanical Engineering) Batch of 2007-11 in the Seminar Class for VI Semester – III Year Students in Spring 2010
    2 : May 2010 Galgotias College of Engineering and Technology Department of Mechanical Engineering Carbon-Carbon Composites A Report of a Seminar delivered by Gaurav Pal Sharma in Partial Fulfillment of Degree Requirements as per UPTU Syllabus for the award of Bachelor of Technology (Mechanical Engineering) Batch of 2007-11 in the Seminar Class for VI Semester – III Year Students in Spring 2010
    3 : May 2010 Interior Title Page CERTIFICATE It is certified that Mr. /Ms. __________________________________ has delivered a Seminar on __________________________________ successfully and submitted a Seminar Report as a part of UPTU’s curricular requirement towards B.Tech. (Mechanical Engineering) in the VI Semester in 2010. Shri Sanjay Kumar Prof.Y.V.S.Kumar Coordinator - Seminars Coordinator - Seminars Mechanical Engineering Mechanical Engineering
    4 : Carbon-Carbon Composites Carbon-Carbon Composites are the woven mesh of Carbon-fibers. Carbon-Carbon Composites are used for their high strength and modulus of rigidity. Carbon-Carbon Composites' structure can be tailored to meet requirements. Carbon-Carbon Composites are light weight material which can withstand temperatures up to 3000°C
    5 : FMI : Fiber materials Inc. Technical support in design of woven fabrics. 2-D tape, 3-D orthogonal, polar and N-D constructions. FMI woven products allow for placement of fibers in various directions to obtain required mechanical properties.
    6 : Products Variety of high temperature applications.
    7 : Heat Shields Baffle Heat Shield Flexi Heat Shield
    8 : Fabrication of C/C Composites Liquid Phase Infiltration Chemical Vapor Deposition
    9 : Manufacturing Process :
    10 : Liquid Phase Infiltration Preparation of C/C fiber pre-form of desired shape and structure Liquid pre-cursor : Petroleum pitch/ Phenolic resin/ Coal tar Pyrolysis (Chemical deposition by heat in absence of O2 It is processed at 540–1000°C under high pressure Pyrolysis cycle is repeated 3 to 10 times for desired density Heat Treatment converts amorphous C into crystalline C Temperature range of treatment :1500-3000°C Heat treatment increases Modulus of Elasticity and Strength
    11 : Chemical Vapor Deposition Preparation of C/C fiber pre-form of desired shape and structure Densification of the composite by CVD technique Infiltration from pressurized hydrocarbon gases at 990-1210°C Gas is pyrolyzed from deposition on fibre surface Process duration depends on thickness of pre-form Heat treatment increases Modulus of Elasticity and Strength This process gives higher strength and modulus of elasticity
    12 : Representative Weave Constructions
    13 : Multi-Directional Woven Pre-forms :
    14 : Properties of C/C Composites Excellent Thermal Shock Resistance Low Coefficient of Thermal Expansion High Modulus of Elasticity ( 200 GPa ) High Thermal Conductivity ( 100 W/m*K ) Low Density ( 1830 Kg/m^3 ) High Strength Low Coefficient of Friction ( in Fiber direction ) Thermal Resistance in non-oxidizing atmosphere High Abrasion Resistance High Electrical Conductivity Non-Brittle Failure
    15 : Disadvantage : Low oxidation resistance Reacts with Oxygen at temperature above 490°C
    16 : Protection Method: Ceramic coatings Physical vapor deposition Plasma spraying Injecting with inorganic salts , borate & silicate glass. Replacement of C/C matrix material by Si-C.
    17 : Application High Performance Braking System Refractory Material Hot-Pressed Dies Turbo-Jet Engine Components Heating Elements Missile Nose-Tips Rocket Motor Throats Leading Edges Heat Shields X-Ray Targets

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