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229. The microstructure and some properties of HIPC carbon from coal tar pitch
230
Abstracts
induced reaction product. The fluorescent and infrared analysis of the solvent induced reaction product indicate the presence of aliphatic and hydroaromatic material. 226. Microtextural characterization of natural and heat-treated coals J. N. Rouzaud and A. Oberlin (Laboratoire Murccl Mathieu, ER 131 du CNRS, UER Sciences, 45046-Orleans Cedex, France). Coals of increasing
rank contain a mixture of solid fragments and particles which look liquid. The first ones are a fractions insoluble in boiling anthracene-oil, the others are /I fractions (soluble in anthracene-oil but insoluble in toluene). The content of fi fraction passes by a maximum as softening during pyrolysis. This fraction is responsible for coal behavior in heat-treatment. 227. Pyrocarbon structures and microtextures J. Goma and A. Oberlin (Laboratoire Marcel MutUER Sciences, hieu, ER 131 du CNRS, 45046-Orleans Cedex, France). Pyrocarbons used in
polycrystalline silicon solar batteries were studied by TEM and X-rays. High temperature pyrocarbons are lamellar and partially graphitize suddenly. Rough laminar ones are lamellar graphitizing carbons. Smooth laminar pyrocarbons are lamellae distorted and crumpled heterogeneously, their degree of graphitization is variable. Isotropic pyrocarbons are porous and non graphitizing. Reactivity with silicon increases from lamellar to isotropic pyrocarbons. 228. A new process of the isotropic pyrolytic carbon deposition J.-Y. Lee and J.-H. Je (Korea Advanced Institute of Science and Technology, Department of Material Science and Engineering, P.O. Box 150 Chongryang, Seoul, Korea). A new “Tumbling Bed” process in
which isotropic pyrolytic carbon could be deposited from propane in the temperature range 900°C to 1230°C has been developed. The characteristics of the pyrolytic carbons deposited in this tumbling bed have been studied with process variables; gas composition, total flow rate, RPM of the reactor and temperature. 229. The microstructure and some properties of HIPC carbon from coal tar pitch Zhu Liang-jie and Jiang Dong-hua (Beijing Research Institute of Materials and Technology P.O. BOX 9221, Beijing, China). The paper reports the changes
in the microstructure, bulk density and thermal expansion coefficient of HIPC carbon formed from coal tar pitch of An Shan China in different locations of stainless steel container at temperature of 600°C and pressure of 1000 Kg/cm’. 230. Structure of ion implanted graphite B. S. Elman, M. S. Dresselhaus and G. Dresselhaus (MIT, Cambridge, MA 03149, U.S.A.). T. Venkatesan and B. Wilkens (Bell Laboratories, Murray Hill, NJ 07974, U.S.A.). Ion implantation is used to
modify the properties of the host graphite material by permitting the introduction of species which cannot be introduced by chemical means. By use of a hot stage for implantation, it has been possible to almost eliminate the lattice damage introduced by ion implantation. The use of Raman spectroscopy to monitor lattice damage and subsequent annealing will be discussed. 231. Optical properties of carbon black particles in KBr composites D. Ordiera and F. Carmona (Centre de Recherche Paul Pascal, Domaine Universitaire, 33405 Talance, France). Pellets of KBr containing adjustable concen-
trations of carbon black particles much smaller than the wavelength have been analyzed between 300 and 1800 nm. We show that our results agree with currently used effective medium theories only for very weakly concentrated samples: discrepancies at high concentration are tentatively attributed to percolative effects. 232. Importance of carbon black morphology on its use in electrically conductive polymer composites Jordan R. Nelson and William K. Wissing (RCA/David Surnoff Research Center, Princeton, NJ 08540, U.S.A.). Rheology and electrical properties
(d.c. and at 1 GHz) were studied for a variety of electrically conductive grades of carbon blacks in polyvinylchloride. These properties of the composite were found to be dependent variables and to follow DBP number, and both mesopore volume and surface area of the carbon black used. 233. Mercury porosimetry analysis of fine-grained graphite W. H. Brixius (Poco Graphite, Inc., 1601 S. State Street, Decatur, TX 76234, U.S.A.). J. V. Dagdigian (Science & Technology Division, Union Oil Company of Caltfornia, Brea, CA 92621, U.S.A.). Mercury
porosimetry data on fine-grained Poco graphite has revealed a definite relationship between closed porosity and apparent density with the closed porosity increasing as the apparent density increases. The pore size also increases as apparent density increases. Additional work is required, but the pore characteristics of Poco fine-grained graphites are now more clearly understood. 234. Problems associated with ultrasonic testing of bulk graphite E. P. Kennedy and S. F. Lewallen (Great Lakes Research Corporation, Elizabethton, TN 37643, U.S.A.). For many graphite applications, the elastic
property data are necessary to predict performance. Ultrasonic velocities are commonly used to determine the elastic constants. Typically, the ultrasonic data is used alone to predict and evaluate performance. This practice can be misleading, however, because an understanding of the microstructural effects on ultrasonic date is essential.
Abstracts
induced reaction product. The fluorescent and infrared analysis of the solvent induced reaction product indicate the presence of aliphatic and hydroaromatic material. 226. Microtextural characterization of natural and heat-treated coals J. N. Rouzaud and A. Oberlin (Laboratoire Murccl Mathieu, ER 131 du CNRS, UER Sciences, 45046-Orleans Cedex, France). Coals of increasing
rank contain a mixture of solid fragments and particles which look liquid. The first ones are a fractions insoluble in boiling anthracene-oil, the others are /I fractions (soluble in anthracene-oil but insoluble in toluene). The content of fi fraction passes by a maximum as softening during pyrolysis. This fraction is responsible for coal behavior in heat-treatment. 227. Pyrocarbon structures and microtextures J. Goma and A. Oberlin (Laboratoire Marcel MutUER Sciences, hieu, ER 131 du CNRS, 45046-Orleans Cedex, France). Pyrocarbons used in
polycrystalline silicon solar batteries were studied by TEM and X-rays. High temperature pyrocarbons are lamellar and partially graphitize suddenly. Rough laminar ones are lamellar graphitizing carbons. Smooth laminar pyrocarbons are lamellae distorted and crumpled heterogeneously, their degree of graphitization is variable. Isotropic pyrocarbons are porous and non graphitizing. Reactivity with silicon increases from lamellar to isotropic pyrocarbons. 228. A new process of the isotropic pyrolytic carbon deposition J.-Y. Lee and J.-H. Je (Korea Advanced Institute of Science and Technology, Department of Material Science and Engineering, P.O. Box 150 Chongryang, Seoul, Korea). A new “Tumbling Bed” process in
which isotropic pyrolytic carbon could be deposited from propane in the temperature range 900°C to 1230°C has been developed. The characteristics of the pyrolytic carbons deposited in this tumbling bed have been studied with process variables; gas composition, total flow rate, RPM of the reactor and temperature. 229. The microstructure and some properties of HIPC carbon from coal tar pitch Zhu Liang-jie and Jiang Dong-hua (Beijing Research Institute of Materials and Technology P.O. BOX 9221, Beijing, China). The paper reports the changes
in the microstructure, bulk density and thermal expansion coefficient of HIPC carbon formed from coal tar pitch of An Shan China in different locations of stainless steel container at temperature of 600°C and pressure of 1000 Kg/cm’. 230. Structure of ion implanted graphite B. S. Elman, M. S. Dresselhaus and G. Dresselhaus (MIT, Cambridge, MA 03149, U.S.A.). T. Venkatesan and B. Wilkens (Bell Laboratories, Murray Hill, NJ 07974, U.S.A.). Ion implantation is used to
modify the properties of the host graphite material by permitting the introduction of species which cannot be introduced by chemical means. By use of a hot stage for implantation, it has been possible to almost eliminate the lattice damage introduced by ion implantation. The use of Raman spectroscopy to monitor lattice damage and subsequent annealing will be discussed. 231. Optical properties of carbon black particles in KBr composites D. Ordiera and F. Carmona (Centre de Recherche Paul Pascal, Domaine Universitaire, 33405 Talance, France). Pellets of KBr containing adjustable concen-
trations of carbon black particles much smaller than the wavelength have been analyzed between 300 and 1800 nm. We show that our results agree with currently used effective medium theories only for very weakly concentrated samples: discrepancies at high concentration are tentatively attributed to percolative effects. 232. Importance of carbon black morphology on its use in electrically conductive polymer composites Jordan R. Nelson and William K. Wissing (RCA/David Surnoff Research Center, Princeton, NJ 08540, U.S.A.). Rheology and electrical properties
(d.c. and at 1 GHz) were studied for a variety of electrically conductive grades of carbon blacks in polyvinylchloride. These properties of the composite were found to be dependent variables and to follow DBP number, and both mesopore volume and surface area of the carbon black used. 233. Mercury porosimetry analysis of fine-grained graphite W. H. Brixius (Poco Graphite, Inc., 1601 S. State Street, Decatur, TX 76234, U.S.A.). J. V. Dagdigian (Science & Technology Division, Union Oil Company of Caltfornia, Brea, CA 92621, U.S.A.). Mercury
porosimetry data on fine-grained Poco graphite has revealed a definite relationship between closed porosity and apparent density with the closed porosity increasing as the apparent density increases. The pore size also increases as apparent density increases. Additional work is required, but the pore characteristics of Poco fine-grained graphites are now more clearly understood. 234. Problems associated with ultrasonic testing of bulk graphite E. P. Kennedy and S. F. Lewallen (Great Lakes Research Corporation, Elizabethton, TN 37643, U.S.A.). For many graphite applications, the elastic
property data are necessary to predict performance. Ultrasonic velocities are commonly used to determine the elastic constants. Typically, the ultrasonic data is used alone to predict and evaluate performance. This practice can be misleading, however, because an understanding of the microstructural effects on ultrasonic date is essential.