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The role of carbon biotemplate density in mechanical properties of biomorphic SiC
Authors:NR Calderon  M Martinez-Escandell  J Narciso  F Rodríguez-Reinoso
Affiliation:1. Departamento de Química Inorgánica, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain;2. Instituto Universitario de Materiales de Alicante (IUMA), Apdo. 99, 03080 Alicante, Spain;1. Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao 066004, China;2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China;3. Beidaihe Center Experiment Station, Chinese Academy of Fishery Science, 066100 Beidaihe, China;1. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa;2. Department of Chemistry, Durban University of Technology, P.O. Box 1334, Durban, 4000, South Africa;1. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;3. Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
Abstract:Biomorphic SiC was prepared from four types of Mediterranean wood as carbon precursor. Carbon biotemplates were obtained by pyrolysis and carbonization up to 1400 °C and they were infiltrated with liquid silicon in two different directions. A linear correlation between bending strength and bioSiC density for different types of softwood and hardwood has been found. Mechanical properties were modelled according to the MSA (minimum solid area) approach. Fairly good correlation was found when biomorphic SiC is treated as porous solid. Moreover, the fabrication of bioSiC from carbon biotemplates heat-treated up to 2500 °C has been additionally studied. An improvement up to 56% in flexural strength has been reached by densification of bioC at such high temperature.
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