The Experts below are selected from a list of 1413 Experts worldwide ranked by ideXlab platform

Matthew P. Duran - One of the best experts on this subject based on the ideXlab platform.

  • Surface treatments of solvated mesophase Pitch-Based Carbon Fibers
    Journal of Materials Science, 2017
    Co-Authors: Ahmad Vakili, Matthew P. Duran
    Abstract:

    The effects of oxidation treatments and surface coating on the surface properties of the solvated mesophase Pitch-Based Carbon Fiber (CF) are investigated to improve the mechanical properties of the potentially low-cost CF composites. The CFs were treated with air, O_3, CO_2/H_2O, or HNO_3 solution or modified with an epoxy coating. The surface of the treated Fibers was characterized by adsorption of methylene blue, NaOH uptake, fragmentation test, composite flexural test, and optical microscopy and SEM examination. Gaseous oxidization is considered a suitable and economical process for this potentially low-cost and low packing density CFs. O_3 oxidation is more effective than other oxidation treatments and introduces more acidic functional groups and a suitable surface area on the surface of the treated CFs, leading to a shorter Fiber critical length and higher interfacial shear strength between the CF and the epoxy resin. Surface coating in 5 wt% of epoxy/acetone solution also effectively reduces Fiber critical length due to improved Fiber surface wettability. After surface treatment, the CFs can be directly fabricated into composite materials without weaving and knitting. Increased flexural strength and modulus of the composites are achieved by the use of O_3-oxidized Fibers and Fiber surface coatings. Optical microscopy and SEM confirm that the composites fabricated with the surface-treated Fibers have less debonded area or voids than the untreated ones.

  • Surface treatments of solvated mesophase Pitch-Based Carbon Fibers
    Journal of Materials Science, 2017
    Co-Authors: Zhongren Yue, Ahmad Vakili, Matthew P. Duran
    Abstract:

    The effects of oxidation treatments and surface coating on the surface properties of the solvated mesophase Pitch-Based Carbon Fiber (CF) are investigated to improve the mechanical properties of the potentially low-cost CF composites. The CFs were treated with air, O3, CO2/H2O, or HNO3 solution or modified with an epoxy coating. The surface of the treated Fibers was characterized by adsorption of methylene blue, NaOH uptake, fragmentation test, composite flexural test, and optical microscopy and SEM examination. Gaseous oxidization is considered a suitable and economical process for this potentially low-cost and low packing density CFs. O3 oxidation is more effective than other oxidation treatments and introduces more acidic functional groups and a suitable surface area on the surface of the treated CFs, leading to a shorter Fiber critical length and higher interfacial shear strength between the CF and the epoxy resin. Surface coating in 5 wt% of epoxy/acetone solution also effectively reduces Fiber critical length due to improved Fiber surface wettability. After surface treatment, the CFs can be directly fabricated into composite materials without weaving and knitting. Increased flexural strength and modulus of the composites are achieved by the use of O3-oxidized Fibers and Fiber surface coatings. Optical microscopy and SEM confirm that the composites fabricated with the surface-treated Fibers have less debonded area or voids than the untreated ones.

Shuqi Guo - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical and physical behaviors of short Pitch-Based Carbon Fiber-reinforced HfB2–SiC matrix composites
    Ceramics International, 2013
    Co-Authors: Shuqi Guo, Kimiyoshi Naito, Yutaka Kagawa
    Abstract:

    Abstract Short Pitch-Based Carbon Fiber-reinforced HfB 2 matrix composites containing 20 vol% SiC, with Fiber volume fractions in the range of 20–50%, were manufactured by hot-press process. Highly dense composite compacts were obtained at 2100 °C and 20 MPa for 60 min. The flexural strength of the composites was measured at room temperature and 1600 °C. The fracture toughness, thermal and electrical conductivities of the composites were evaluated at room temperature. The effects of Fiber volume fractions on these properties were assessed. The flexural strength of the composites depended on the Fiber volume fraction. In addition, the flexural strength was significantly greater at 1600 °C than at room temperature. The fracture toughness was improved due to the incorporation of Fibers. The thermal and electrical conductivities decreased with the increase of Fiber volume fraction, however.

  • Thermal and electrical properties of hot-pressed short Pitch-Based Carbon Fiber-reinforced ZrB2–SiC matrix composites
    Ceramics International, 2013
    Co-Authors: Shuqi Guo
    Abstract:

    Abstract Short Pitch-Based Carbon Fiber-reinforced ZrB 2 -20 vol% SiC matrix composites, with Fiber volume fractions in the range of 0–50%, were manufactured by a hot-press process. Highly dense composite compacts were obtained at 2000 °C and 20 MPa for 60 min in Ar atmosphere. The microstructure of the resulting composites was characterized by scanning electron microscopy. The thermal and electrical properties of the composites were evaluated at room temperature. The effects of Fiber volume fraction on these properties were assessed. The thermal and electrical conductivities decreased with increase of Fiber volume fraction. The thermal conductivities of the composites were 48.3–104.7 W m −1  K −1 . The electrical conductivities of the composites were in the range 0.79×10 4 –3.02×10 4  Ω −1  cm −1 .

Ahmad Vakili - One of the best experts on this subject based on the ideXlab platform.

  • Surface treatments of solvated mesophase Pitch-Based Carbon Fibers
    Journal of Materials Science, 2017
    Co-Authors: Ahmad Vakili, Matthew P. Duran
    Abstract:

    The effects of oxidation treatments and surface coating on the surface properties of the solvated mesophase Pitch-Based Carbon Fiber (CF) are investigated to improve the mechanical properties of the potentially low-cost CF composites. The CFs were treated with air, O_3, CO_2/H_2O, or HNO_3 solution or modified with an epoxy coating. The surface of the treated Fibers was characterized by adsorption of methylene blue, NaOH uptake, fragmentation test, composite flexural test, and optical microscopy and SEM examination. Gaseous oxidization is considered a suitable and economical process for this potentially low-cost and low packing density CFs. O_3 oxidation is more effective than other oxidation treatments and introduces more acidic functional groups and a suitable surface area on the surface of the treated CFs, leading to a shorter Fiber critical length and higher interfacial shear strength between the CF and the epoxy resin. Surface coating in 5 wt% of epoxy/acetone solution also effectively reduces Fiber critical length due to improved Fiber surface wettability. After surface treatment, the CFs can be directly fabricated into composite materials without weaving and knitting. Increased flexural strength and modulus of the composites are achieved by the use of O_3-oxidized Fibers and Fiber surface coatings. Optical microscopy and SEM confirm that the composites fabricated with the surface-treated Fibers have less debonded area or voids than the untreated ones.

  • Surface treatments of solvated mesophase Pitch-Based Carbon Fibers
    Journal of Materials Science, 2017
    Co-Authors: Zhongren Yue, Ahmad Vakili, Matthew P. Duran
    Abstract:

    The effects of oxidation treatments and surface coating on the surface properties of the solvated mesophase Pitch-Based Carbon Fiber (CF) are investigated to improve the mechanical properties of the potentially low-cost CF composites. The CFs were treated with air, O3, CO2/H2O, or HNO3 solution or modified with an epoxy coating. The surface of the treated Fibers was characterized by adsorption of methylene blue, NaOH uptake, fragmentation test, composite flexural test, and optical microscopy and SEM examination. Gaseous oxidization is considered a suitable and economical process for this potentially low-cost and low packing density CFs. O3 oxidation is more effective than other oxidation treatments and introduces more acidic functional groups and a suitable surface area on the surface of the treated CFs, leading to a shorter Fiber critical length and higher interfacial shear strength between the CF and the epoxy resin. Surface coating in 5 wt% of epoxy/acetone solution also effectively reduces Fiber critical length due to improved Fiber surface wettability. After surface treatment, the CFs can be directly fabricated into composite materials without weaving and knitting. Increased flexural strength and modulus of the composites are achieved by the use of O3-oxidized Fibers and Fiber surface coatings. Optical microscopy and SEM confirm that the composites fabricated with the surface-treated Fibers have less debonded area or voids than the untreated ones.

Zhongren Yue - One of the best experts on this subject based on the ideXlab platform.

  • Surface treatments of solvated mesophase Pitch-Based Carbon Fibers
    Journal of Materials Science, 2017
    Co-Authors: Zhongren Yue, Ahmad Vakili, Matthew P. Duran
    Abstract:

    The effects of oxidation treatments and surface coating on the surface properties of the solvated mesophase Pitch-Based Carbon Fiber (CF) are investigated to improve the mechanical properties of the potentially low-cost CF composites. The CFs were treated with air, O3, CO2/H2O, or HNO3 solution or modified with an epoxy coating. The surface of the treated Fibers was characterized by adsorption of methylene blue, NaOH uptake, fragmentation test, composite flexural test, and optical microscopy and SEM examination. Gaseous oxidization is considered a suitable and economical process for this potentially low-cost and low packing density CFs. O3 oxidation is more effective than other oxidation treatments and introduces more acidic functional groups and a suitable surface area on the surface of the treated CFs, leading to a shorter Fiber critical length and higher interfacial shear strength between the CF and the epoxy resin. Surface coating in 5 wt% of epoxy/acetone solution also effectively reduces Fiber critical length due to improved Fiber surface wettability. After surface treatment, the CFs can be directly fabricated into composite materials without weaving and knitting. Increased flexural strength and modulus of the composites are achieved by the use of O3-oxidized Fibers and Fiber surface coatings. Optical microscopy and SEM confirm that the composites fabricated with the surface-treated Fibers have less debonded area or voids than the untreated ones.

Yutaka Kagawa - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical and physical behaviors of short Pitch-Based Carbon Fiber-reinforced HfB2–SiC matrix composites
    Ceramics International, 2013
    Co-Authors: Shuqi Guo, Kimiyoshi Naito, Yutaka Kagawa
    Abstract:

    Abstract Short Pitch-Based Carbon Fiber-reinforced HfB 2 matrix composites containing 20 vol% SiC, with Fiber volume fractions in the range of 20–50%, were manufactured by hot-press process. Highly dense composite compacts were obtained at 2100 °C and 20 MPa for 60 min. The flexural strength of the composites was measured at room temperature and 1600 °C. The fracture toughness, thermal and electrical conductivities of the composites were evaluated at room temperature. The effects of Fiber volume fractions on these properties were assessed. The flexural strength of the composites depended on the Fiber volume fraction. In addition, the flexural strength was significantly greater at 1600 °C than at room temperature. The fracture toughness was improved due to the incorporation of Fibers. The thermal and electrical conductivities decreased with the increase of Fiber volume fraction, however.