The microstructures and formation mechanism of headstand pyrocarbon cones developed by electromagnetic-field-assisted CVD
A novel headstand pyrocarbon cones (HPCs) with hollow structure was developed at 650-750 oC by the electromagnetic-field-assisted chemical vapor deposition.It is observed that the HPCs can form on the surfaces of pyrocarbon layers deposited in advance on carbon fibers which were used as the reinforced material to form carbon/carbon composites.The fine microstructures of the HPCs were characterized by high-resolution transmission electron microscopy.The results showed that the HPCs,which textural features directly transfer from turbostratic structures in roots to a well-ordered high texture in stems,were deposited onto the substrate surfaces.And the degree of high texture ordering decreases gradually from the stem to the tail in the HPCs.The formation mechanism of the HPCs was inferred as the comprehensive effect of polarization induction on electromagnetic fields and particle-filler property under disruptive discharge.
Headstand pyrocarbon cones chemical vapor deposition electromagnetic-field-assisted fine microstructure formation mechanism
Tu Chuan-jun Huang Qi-zhong Zhang Ming-yu Zhao Xin-qi Chen Jiang-hua
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083,PR China; Colle State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083,PR China College of Materials Science and Engineering, Hunan University, Changsha 410082, PR China
国际会议
上海
英文
292-292
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）