Ap Treatment Of Carbon Fiber 09

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  • Use NCSU or Cornell Fiber diameter
  • Ap Treatment Of Carbon Fiber 09

    1. 1. Atmospheric Plasma(AP)Treatment of Carbon Fiber<br />Joseph Heil<br />7/17/2009<br />
    2. 2. Purpose<br />Increase fiber to resin adhesion<br />Maintain strength & stiffness of fiber<br />Stronger or lighter composites<br />Applicability to other fibers<br />2<br />
    3. 3. Intro to Atmospheric Plasma<br />760 Torr<br />Reduces complexity<br />Ionized gas<br />High energy electrons<br />Low energy ions<br />Low density compared to vacuum plasma<br />3<br />
    4. 4. Fiber to Resin Adhesion<br />Controlled by:<br />Surface chemistry<br />Surface area<br />Mechanical interlocking<br />Current Solutions:<br />Electrochemical oxidation<br />Coupling agents (size)<br />Non-circular fiber cross-section<br />4<br />
    5. 5. What Can AP Do?<br />Deposit polymer coating<br />Functionalize fiber surface<br />Increase surface roughness<br />Potential for significant damage<br />5<br />
    6. 6. Factors Effecting Treatment<br />Gas composition<br />Power<br />Dwell time<br />Chamber Design<br />6<br />
    7. 7. Tensile Testing<br />7<br />
    8. 8. Distribution of Breaking Loads<br />8<br />
    9. 9. ANOVA<br />Table 3. Two factor ANOVA: treatment time and chemistry<br />9<br />
    10. 10. ANOVA<br />Table 4. Adjusted ANOVA to only reflect contribution of plasma chemistry<br />10<br />
    11. 11. SEM Imaging<br />C-AP1<br />B – RCF4<br />A-Virgin<br />11<br />
    12. 12. Resin to Fiber Adhesion<br />12<br />
    13. 13. Cornell SEM Analysis<br />B-Ribbed Surface<br />A-Projecting Fibrils<br />C-Detailed<br />Projecting Fibrils<br />D-Detailed Ribbed Surface<br />13<br />
    14. 14. Conclusions<br />Atmospheric Plasma can be used to increase the resin to fiber adhesion of carbon fiber<br />Treatment increases surface area/ mechanical interlocking<br />Gas chemistry more significant than treatment time<br />Non-uniformity in plasma may contribute to reduction in strength of fiber<br />14<br />
    15. 15. Future Work<br />Sized versus unsized fibers<br />Chemical Analysis<br />Chamber design/ discharge method<br />15<br />
    16. 16. Acknowledgments<br />Matthew King<br />Dr. Jerry Cuomo<br />Dr. Anil Netravali<br />16<br />
    17. 17. Questions<br />17<br />Joseph Heil<br />jpheil@ncsu.edu<br />
    18. 18. X-Ray Photoelectron Spectroscopy<br />18<br />
    19. 19. Introduction to Carbon Fiber<br />Advantages <br />High strength to weight ratio<br />High thermal & electrical conductivity<br />Military, commercial, & consumer applications<br />Disadvantages<br />Cost<br />Complex/ proprietary manufacturing<br />Poor resin to fiber adhesion<br />19<br />

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