Cf/Cu composite was prepared by vacuum melting infiltration. Ti and Cr were doped to the Cu alloy to improve the wettability between Cu and carbon. The microstrueture was investigated by XRD, SEM and EDS. The arc eros...Cf/Cu composite was prepared by vacuum melting infiltration. Ti and Cr were doped to the Cu alloy to improve the wettability between Cu and carbon. The microstrueture was investigated by XRD, SEM and EDS. The arc erosion rate of Cf/Cu composite was investigated in vacuum. The results showed that the Ti and Cr could improve the wettability between Cu and C/C preform and the infiltration ability of Cu into C/ C preform greatly. A TiC interface formed between the fibers and matrix. The good bonding between the fiber and matrix guaranteed that part of the Cu matrix can still be bonded on the fibers even when the material was exposed to the plasma. Consequently, the carbon fibers were protected from the erosion. In comparison, Cu was completely consumed by the arc erosion. Hence, the graphite was eroded and presented a cauliflower-like morphology. Therefore, the prepared C/Cu bad better ability to resist the arc erosion, compared with common Cu-C material.展开更多
Ablation behaviors of silicon carbide(SiC)coated 2Dcarbon fiber reinforced silicon carbide matrix(designated as 2DC/SiC)composites prepared by chemical vapor infiltration(CVI)were investigated by a continuous wave CO2...Ablation behaviors of silicon carbide(SiC)coated 2Dcarbon fiber reinforced silicon carbide matrix(designated as 2DC/SiC)composites prepared by chemical vapor infiltration(CVI)were investigated by a continuous wave CO2 laser.The 2DC/SiC specimens were exposed under laser for 0.5sin ambient air,and the laser powers varied from 500Wto 1500W.A 3Dfinite element model was established to calculate the temperature distribution in the laser ablation process.The ablation depth,width and profile were measured by Laser Confocal Microscope(LCM).The results indicate that the increase of ablation depth follows a linear relation with the increase of laser power,and the increase of ablation width follows a similar trend with the increase of the isotherm diameter of 1712℃.The ablated surface can be distinguished into three different regions by scanning electron microscope(SEM)observation,including ablation center,transition zone and ablation fringe.The ablation behaviors of carbon fibers and SiC matrices in different regions were presented and discussed in the study.展开更多
基金Funded by the National Natural Science Foundation of China(No.51002121)Postgraduate Technology Innovation Project of Taiyuan University of Science and Technology(No.20134008)
文摘Cf/Cu composite was prepared by vacuum melting infiltration. Ti and Cr were doped to the Cu alloy to improve the wettability between Cu and carbon. The microstrueture was investigated by XRD, SEM and EDS. The arc erosion rate of Cf/Cu composite was investigated in vacuum. The results showed that the Ti and Cr could improve the wettability between Cu and C/C preform and the infiltration ability of Cu into C/ C preform greatly. A TiC interface formed between the fibers and matrix. The good bonding between the fiber and matrix guaranteed that part of the Cu matrix can still be bonded on the fibers even when the material was exposed to the plasma. Consequently, the carbon fibers were protected from the erosion. In comparison, Cu was completely consumed by the arc erosion. Hence, the graphite was eroded and presented a cauliflower-like morphology. Therefore, the prepared C/Cu bad better ability to resist the arc erosion, compared with common Cu-C material.
基金National Natural Science Foundation of China(51002121)
文摘Ablation behaviors of silicon carbide(SiC)coated 2Dcarbon fiber reinforced silicon carbide matrix(designated as 2DC/SiC)composites prepared by chemical vapor infiltration(CVI)were investigated by a continuous wave CO2 laser.The 2DC/SiC specimens were exposed under laser for 0.5sin ambient air,and the laser powers varied from 500Wto 1500W.A 3Dfinite element model was established to calculate the temperature distribution in the laser ablation process.The ablation depth,width and profile were measured by Laser Confocal Microscope(LCM).The results indicate that the increase of ablation depth follows a linear relation with the increase of laser power,and the increase of ablation width follows a similar trend with the increase of the isotherm diameter of 1712℃.The ablated surface can be distinguished into three different regions by scanning electron microscope(SEM)observation,including ablation center,transition zone and ablation fringe.The ablation behaviors of carbon fibers and SiC matrices in different regions were presented and discussed in the study.
