The Experts below are selected from a list of 19080 Experts worldwide ranked by ideXlab platform

Hejun Li - One of the best experts on this subject based on the ideXlab platform.

  • oxidation protection of carbon carbon composites by a novel sic nanoribbon reinforced sic si Ceramic Coating
    Corrosion Science, 2015
    Co-Authors: Hejun Li, Lu Li, Lehua Qi
    Abstract:

    Abstract A novel SiC–Si Ceramic Coating reinforced with well-dispersed SiC nanoribbons was prepared on carbon/carbon (C/C) composites by chemical vapor deposition and pack cementation. The mechanical tests showed that the fracture toughness of the Coating and the interfacial bonding strength of the Coating-C/C increased by 98% and 99% after incorporating SiC nanoribbons, respectively. The oxidation tests showed that the oxidation of the samples was a continuous weight gain process, and the final weight gain were 61.84 g⋅m −2 during thermogravimetric analysis from 300 °C to 1500 °C and 38.0 g⋅m −2 after isothermal oxidation test for 96 h, respectively.

  • Oxidation protection of carbon/carbon composites by a novel SiC nanoribbon-reinforced SiC-Si Ceramic Coating
    Corrosion Science, 2015
    Co-Authors: Yanhui Chu, Huijuan Luo, Hejun Li, Lu Li, Lehua Qi
    Abstract:

    A novel SiC-Si Ceramic Coating reinforced with well-dispersed SiC nanoribbons was prepared on carbon/carbon (C/C) composites by chemical vapor deposition and pack cementation. The mechanical tests showed that the fracture toughness of the Coating and the interfacial bonding strength of the Coating-C/C increased by 98% and 99% after incorporating SiC nanoribbons, respectively. The oxidation tests showed that the oxidation of the samples was a continuous weight gain process, and the final weight gain were 61.84g{dot operator}m-2 during thermogravimetric analysis from 300°C to 1500°C and 38.0g{dot operator}m-2 after isothermal oxidation test for 96h, respectively.

  • a sic si zrb2 multiphase oxidation protective Ceramic Coating for sic coated carbon carbon composites
    Ceramics International, 2012
    Co-Authors: Hejun Li, Yulei Zhang, Heng Wu, Xinfa Qiang
    Abstract:

    In order to improve the oxidation protective ability of SiC-coated carbon/carbon (C/C) composites, a SiC–Si–ZrB2 multiphase Ceramic Coating was prepared on the surface of SiC-coated C/C composite by the process of pack cementation. The microstructures of the Coating were characterized using X-ray diffraction and scanning electron microscopy. The Coating was found to be composed of SiC, Si and ZrB2. The oxidation resistance of the coated specimens was investigated at 1773 K. The results show that the SiC–Si–ZrB2 can protect C/C against oxidation at 1773 K for more than 386 h. The excellent oxidation protective performance is attributed to the integrity and stability of SiO2 glass improved by the formation of ZrSiO4 phase during oxidation. The coated specimens were given thermal shocks between 1773 K and room temperature for 20 times. After thermal shocks, the residual flexural strength of the coated C/C composites was decreased by 16.3%.

  • A SiC-Si-ZrB 2 multiphase oxidation protective Ceramic Coating for SiC-coated carbon/carbon composites
    Ceramics International, 2012
    Co-Authors: Xiyuan Yao, Yulei Zhang, Hejun Li, Heng Wu, Xinfa Qiang
    Abstract:

    In order to improve the oxidation protective ability of SiC-coated carbon/carbon (C/C) composites, a SiC-Si-ZrB 2 multiphase Ceramic Coating was prepared on the surface of SiC-coated C/C composite by the process of pack cementation. The microstructures of the Coating were characterized using X-ray diffraction and scanning electron microscopy. The Coating was found to be composed of SiC, Si and ZrB 2. The oxidation resistance of the coated specimens was investigated at 1773 K. The results show that the SiC-Si-ZrB 2 can protect C/C against oxidation at 1773 K for more than 386 h. The excellent oxidation protective performance is attributed to the integrity and stability of SiO 2 glass improved by the formation of ZrSiO 4 phase during oxidation. The coated specimens were given thermal shocks between 1773 K and room temperature for 20 times. After thermal shocks, the residual flexural strength of the coated C/C composites was decreased by 16.3%. © 2011 Elsevier Ltd and Techna Group S.r.l.

  • Toughening by SiC nanowires in a dense SiC - Si Ceramic Coating for oxidation protection of C / C composites
    Journal of the American Ceramic Society, 2012
    Co-Authors: Yanhui Chu, Lehua Qi, Qiangang Fu, Hejun Li, Xu Zou
    Abstract:

    A dense oxidation protective SiC–Si Ceramic Coating with well-dispersion SiC nanowires was prepared on carbon/carbon (C/C) composites using a two-step technique consisting of chemical vapor deposition and hot-pressing reactive sintering. The results showed that the toughness and thermal shock resistance of the Coating were dramatically improved, resulting in an excellent oxidation protection for the coated C/C composites, which is attributed primarily to the toughening effects of SiC nanowires in the Coating including two special energy dissipation mechanisms involving the super-plasticity deformation of SiC nanowires and the plastic fracture at the interface of the nanowire-matrix, except for nanowire pullout, nanowire bridging, and microcrack deflection. More importantly, a novel oxidation protective failure mechanism of the coated C/C composites revealed that the presence of Al3+ in the Coating, damaged the network structure of SiO2 glass and resulted in the slight oxidation of C/C composites.

Lehua Qi - One of the best experts on this subject based on the ideXlab platform.

  • oxidation protection of carbon carbon composites by a novel sic nanoribbon reinforced sic si Ceramic Coating
    Corrosion Science, 2015
    Co-Authors: Hejun Li, Lu Li, Lehua Qi
    Abstract:

    Abstract A novel SiC–Si Ceramic Coating reinforced with well-dispersed SiC nanoribbons was prepared on carbon/carbon (C/C) composites by chemical vapor deposition and pack cementation. The mechanical tests showed that the fracture toughness of the Coating and the interfacial bonding strength of the Coating-C/C increased by 98% and 99% after incorporating SiC nanoribbons, respectively. The oxidation tests showed that the oxidation of the samples was a continuous weight gain process, and the final weight gain were 61.84 g⋅m −2 during thermogravimetric analysis from 300 °C to 1500 °C and 38.0 g⋅m −2 after isothermal oxidation test for 96 h, respectively.

  • Oxidation protection of carbon/carbon composites by a novel SiC nanoribbon-reinforced SiC-Si Ceramic Coating
    Corrosion Science, 2015
    Co-Authors: Yanhui Chu, Huijuan Luo, Hejun Li, Lu Li, Lehua Qi
    Abstract:

    A novel SiC-Si Ceramic Coating reinforced with well-dispersed SiC nanoribbons was prepared on carbon/carbon (C/C) composites by chemical vapor deposition and pack cementation. The mechanical tests showed that the fracture toughness of the Coating and the interfacial bonding strength of the Coating-C/C increased by 98% and 99% after incorporating SiC nanoribbons, respectively. The oxidation tests showed that the oxidation of the samples was a continuous weight gain process, and the final weight gain were 61.84g{dot operator}m-2 during thermogravimetric analysis from 300°C to 1500°C and 38.0g{dot operator}m-2 after isothermal oxidation test for 96h, respectively.

  • Toughening by SiC nanowires in a dense SiC - Si Ceramic Coating for oxidation protection of C / C composites
    Journal of the American Ceramic Society, 2012
    Co-Authors: Yanhui Chu, Lehua Qi, Qiangang Fu, Hejun Li, Xu Zou
    Abstract:

    A dense oxidation protective SiC–Si Ceramic Coating with well-dispersion SiC nanowires was prepared on carbon/carbon (C/C) composites using a two-step technique consisting of chemical vapor deposition and hot-pressing reactive sintering. The results showed that the toughness and thermal shock resistance of the Coating were dramatically improved, resulting in an excellent oxidation protection for the coated C/C composites, which is attributed primarily to the toughening effects of SiC nanowires in the Coating including two special energy dissipation mechanisms involving the super-plasticity deformation of SiC nanowires and the plastic fracture at the interface of the nanowire-matrix, except for nanowire pullout, nanowire bridging, and microcrack deflection. More importantly, a novel oxidation protective failure mechanism of the coated C/C composites revealed that the presence of Al3+ in the Coating, damaged the network structure of SiO2 glass and resulted in the slight oxidation of C/C composites.

Xinfa Qiang - One of the best experts on this subject based on the ideXlab platform.

  • a sic si zrb2 multiphase oxidation protective Ceramic Coating for sic coated carbon carbon composites
    Ceramics International, 2012
    Co-Authors: Hejun Li, Yulei Zhang, Heng Wu, Xinfa Qiang
    Abstract:

    In order to improve the oxidation protective ability of SiC-coated carbon/carbon (C/C) composites, a SiC–Si–ZrB2 multiphase Ceramic Coating was prepared on the surface of SiC-coated C/C composite by the process of pack cementation. The microstructures of the Coating were characterized using X-ray diffraction and scanning electron microscopy. The Coating was found to be composed of SiC, Si and ZrB2. The oxidation resistance of the coated specimens was investigated at 1773 K. The results show that the SiC–Si–ZrB2 can protect C/C against oxidation at 1773 K for more than 386 h. The excellent oxidation protective performance is attributed to the integrity and stability of SiO2 glass improved by the formation of ZrSiO4 phase during oxidation. The coated specimens were given thermal shocks between 1773 K and room temperature for 20 times. After thermal shocks, the residual flexural strength of the coated C/C composites was decreased by 16.3%.

  • A SiC-Si-ZrB 2 multiphase oxidation protective Ceramic Coating for SiC-coated carbon/carbon composites
    Ceramics International, 2012
    Co-Authors: Xiyuan Yao, Yulei Zhang, Hejun Li, Heng Wu, Xinfa Qiang
    Abstract:

    In order to improve the oxidation protective ability of SiC-coated carbon/carbon (C/C) composites, a SiC-Si-ZrB 2 multiphase Ceramic Coating was prepared on the surface of SiC-coated C/C composite by the process of pack cementation. The microstructures of the Coating were characterized using X-ray diffraction and scanning electron microscopy. The Coating was found to be composed of SiC, Si and ZrB 2. The oxidation resistance of the coated specimens was investigated at 1773 K. The results show that the SiC-Si-ZrB 2 can protect C/C against oxidation at 1773 K for more than 386 h. The excellent oxidation protective performance is attributed to the integrity and stability of SiO 2 glass improved by the formation of ZrSiO 4 phase during oxidation. The coated specimens were given thermal shocks between 1773 K and room temperature for 20 times. After thermal shocks, the residual flexural strength of the coated C/C composites was decreased by 16.3%. © 2011 Elsevier Ltd and Techna Group S.r.l.

Yanhui Chu - One of the best experts on this subject based on the ideXlab platform.

  • Oxidation protection of carbon/carbon composites by a novel SiC nanoribbon-reinforced SiC-Si Ceramic Coating
    Corrosion Science, 2015
    Co-Authors: Yanhui Chu, Huijuan Luo, Hejun Li, Lu Li, Lehua Qi
    Abstract:

    A novel SiC-Si Ceramic Coating reinforced with well-dispersed SiC nanoribbons was prepared on carbon/carbon (C/C) composites by chemical vapor deposition and pack cementation. The mechanical tests showed that the fracture toughness of the Coating and the interfacial bonding strength of the Coating-C/C increased by 98% and 99% after incorporating SiC nanoribbons, respectively. The oxidation tests showed that the oxidation of the samples was a continuous weight gain process, and the final weight gain were 61.84g{dot operator}m-2 during thermogravimetric analysis from 300°C to 1500°C and 38.0g{dot operator}m-2 after isothermal oxidation test for 96h, respectively.

  • Toughening by SiC nanowires in a dense SiC - Si Ceramic Coating for oxidation protection of C / C composites
    Journal of the American Ceramic Society, 2012
    Co-Authors: Yanhui Chu, Lehua Qi, Qiangang Fu, Hejun Li, Xu Zou
    Abstract:

    A dense oxidation protective SiC–Si Ceramic Coating with well-dispersion SiC nanowires was prepared on carbon/carbon (C/C) composites using a two-step technique consisting of chemical vapor deposition and hot-pressing reactive sintering. The results showed that the toughness and thermal shock resistance of the Coating were dramatically improved, resulting in an excellent oxidation protection for the coated C/C composites, which is attributed primarily to the toughening effects of SiC nanowires in the Coating including two special energy dissipation mechanisms involving the super-plasticity deformation of SiC nanowires and the plastic fracture at the interface of the nanowire-matrix, except for nanowire pullout, nanowire bridging, and microcrack deflection. More importantly, a novel oxidation protective failure mechanism of the coated C/C composites revealed that the presence of Al3+ in the Coating, damaged the network structure of SiO2 glass and resulted in the slight oxidation of C/C composites.

Yulei Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Ultra-high temperature Ceramic Coating for carbon/carbon composites against ablation above 2000 K
    Ceramics International, 2018
    Co-Authors: Yulei Zhang, Yanqin Fu, Haohao Wang, Tao Li, Jincui Ren
    Abstract:

    To improve the ablation resistance of carbon/carbon composites at the temperature above 2000 K, a ZrB2-SiC-ZrC ultra-high temperature Ceramic Coating was prepared by combination of supersonic atmosphere plasma spray (SAPS) and reaction melt infiltration. The micro-holes in ZrB2-Si-ZrC Coating prepared by SAPS were effectively filled and the compactness and interface compatibility between the Coating and C/C composites was improved through the reaction melt infiltration process. The ultra-high temperature Ceramic Coating exhibited good ablation resistance under oxyacetylene torch ablation above 2000 K. After ablation for 120 s, the mass and linear ablation rates of the ZrB2-SiC-ZrC coated C/C samples were only −0.016 × 10−3 g/s and 1.30 µm/s, respectively. Good ablation resistance of the ultra-high temperature Ceramic Coating is mainly attributed to the dense Coating structure and the improvement of interface compatibility between the Coating and C/C composites.

  • a sic si zrb2 multiphase oxidation protective Ceramic Coating for sic coated carbon carbon composites
    Ceramics International, 2012
    Co-Authors: Hejun Li, Yulei Zhang, Heng Wu, Xinfa Qiang
    Abstract:

    In order to improve the oxidation protective ability of SiC-coated carbon/carbon (C/C) composites, a SiC–Si–ZrB2 multiphase Ceramic Coating was prepared on the surface of SiC-coated C/C composite by the process of pack cementation. The microstructures of the Coating were characterized using X-ray diffraction and scanning electron microscopy. The Coating was found to be composed of SiC, Si and ZrB2. The oxidation resistance of the coated specimens was investigated at 1773 K. The results show that the SiC–Si–ZrB2 can protect C/C against oxidation at 1773 K for more than 386 h. The excellent oxidation protective performance is attributed to the integrity and stability of SiO2 glass improved by the formation of ZrSiO4 phase during oxidation. The coated specimens were given thermal shocks between 1773 K and room temperature for 20 times. After thermal shocks, the residual flexural strength of the coated C/C composites was decreased by 16.3%.

  • A SiC-Si-ZrB 2 multiphase oxidation protective Ceramic Coating for SiC-coated carbon/carbon composites
    Ceramics International, 2012
    Co-Authors: Xiyuan Yao, Yulei Zhang, Hejun Li, Heng Wu, Xinfa Qiang
    Abstract:

    In order to improve the oxidation protective ability of SiC-coated carbon/carbon (C/C) composites, a SiC-Si-ZrB 2 multiphase Ceramic Coating was prepared on the surface of SiC-coated C/C composite by the process of pack cementation. The microstructures of the Coating were characterized using X-ray diffraction and scanning electron microscopy. The Coating was found to be composed of SiC, Si and ZrB 2. The oxidation resistance of the coated specimens was investigated at 1773 K. The results show that the SiC-Si-ZrB 2 can protect C/C against oxidation at 1773 K for more than 386 h. The excellent oxidation protective performance is attributed to the integrity and stability of SiO 2 glass improved by the formation of ZrSiO 4 phase during oxidation. The coated specimens were given thermal shocks between 1773 K and room temperature for 20 times. After thermal shocks, the residual flexural strength of the coated C/C composites was decreased by 16.3%. © 2011 Elsevier Ltd and Techna Group S.r.l.