Preparation, Characterization and Oxidation Mechanism Study of Biomorphic Porous Carbon Coated with SiC Gradient Coating
A biomorphic porous carbon coated with gradient SiC coating (SiC/BPC) was prepared by controlled carbonizing native pine under Ar atmosphere and then processed with precursor infiltration-pyrolysis (PIP) of organosilan. Microstructure and component of SiC/BPC were performed by SEM, EDS (attached with line scanning program) and XRD. The non-isothermal oxidation properties and mechanism of SiC/BPC were studied by TGA. The kinetic parameters were calculated through model-functions methods. Experimental results showed that SiC/BPC has a topologically uniform interconnected porous network microstructure, the SiC coating was amorphous and combines well with the carbon surface, which improved the oxidation resistance of BPC material about 150K. The non-isothermal oxidation reaction of SiC/BPC exhibited the characteristic of self-catalytic, the oxidation mechanism of SiC/BPC was 2-D diffusion, decelerator a-t curve, the kinetic parameters are lgA/min-1= 15.483；Ea/kJ·mol-1 = 287.49.
Biomorphic carbon template SiC gadient coating Oxidation kinetics
Mingjian WU Pengzhao GAO Yanli LIU Hanning XIAO
College of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan China
国际会议
重庆
英文
211-214
2008-06-09（万方平台首次上网日期，不代表论文的发表时间）