Carbon-carbon composite （C/C） materials are prone to severe oxidation and volatilization problems. To address these issues, mullite （3Al2O3.2SiO2）/silicon carbide （SIC） coatings were deposited on C/C composite s...Carbon-carbon composite （C/C） materials are prone to severe oxidation and volatilization problems. To address these issues, mullite （3Al2O3.2SiO2）/silicon carbide （SIC） coatings were deposited on C/C composite substrates characterized into high and low densities. The coatings were applied by a two-step approach： pack cementation and silica sol based slurry coating processes. The relationship between the microstructure of 3Al2O3·2SiO2/SiC coatings and C/C substrates during isothermal oxidation cycle at 1 500 ℃ was investigated using X-ray diffractometer （XRD） and scanning electron microscope （SEM） mounted with energy dispersive spectrometer （EDS）. The results indicate that the density of the substrates has a marked effect on the coatings. Dense, thick and well-bonded coatings are obtained in the high density substrate. After 106 h of isothermal oxidation, the high density substrate with 3Al2O3-2SiO2/SiC coating offers effective protection as compared to low density substrate suffering recession.展开更多
Fusion technologies and materials researches made progress in the major three aspects in 2006, specially implemented the ITER agreement tasks of first wall （FW） plate fabrication qualification and shield bulk therma...Fusion technologies and materials researches made progress in the major three aspects in 2006, specially implemented the ITER agreement tasks of first wall （FW） plate fabrication qualification and shield bulk thermal-hydraulic analysis and design, studied on low activation fusion structure materials and High Z plasma facing materials, experimentally investigated on liquid metal blanket magneto-hydrodynamics effects and so on.展开更多
基金Project(2011CB605805) supported by the National Basic Research Program of ChinaProject(51021063) supported by the Creative Research Group of National Natural Science Foundation of China
文摘Carbon-carbon composite （C/C） materials are prone to severe oxidation and volatilization problems. To address these issues, mullite （3Al2O3.2SiO2）/silicon carbide （SIC） coatings were deposited on C/C composite substrates characterized into high and low densities. The coatings were applied by a two-step approach： pack cementation and silica sol based slurry coating processes. The relationship between the microstructure of 3Al2O3·2SiO2/SiC coatings and C/C substrates during isothermal oxidation cycle at 1 500 ℃ was investigated using X-ray diffractometer （XRD） and scanning electron microscope （SEM） mounted with energy dispersive spectrometer （EDS）. The results indicate that the density of the substrates has a marked effect on the coatings. Dense, thick and well-bonded coatings are obtained in the high density substrate. After 106 h of isothermal oxidation, the high density substrate with 3Al2O3-2SiO2/SiC coating offers effective protection as compared to low density substrate suffering recession.
文摘Fusion technologies and materials researches made progress in the major three aspects in 2006, specially implemented the ITER agreement tasks of first wall （FW） plate fabrication qualification and shield bulk thermal-hydraulic analysis and design, studied on low activation fusion structure materials and High Z plasma facing materials, experimentally investigated on liquid metal blanket magneto-hydrodynamics effects and so on.
