Author : Abdullah Yousef Alsalloum
Publisher :
ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.:/5 (1 download)
Book Synopsis Optimizing the Synthesis Process of Wood-derived Biomorphic Silicon Carbide by : Abdullah Yousef Alsalloum
Download or read book Optimizing the Synthesis Process of Wood-derived Biomorphic Silicon Carbide written by Abdullah Yousef Alsalloum and published by . This book was released on 2017 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomorphic silicon carbide, a porous, light and high strength ceramic typically derived from natural wood, has great potential in high temperature and structural applications. Over the past several years, researchers have developed three main routes to fabricating biomorphic SiC: reactive infiltration of molten Si, chemical vapor infiltration of Si or SiO, and SiO2-bearing solution infiltration. In this study, the latter was investigated and optimized. In addition, a novel synthesis technique, Si suspension infiltration, is proposed that overcomes the major issues present in the current methods. Four wood species (balsa, pine, maple and oak) offering a wide range of porosities were infiltrated with colloidal SiO2 under varying pressure conditions, and the corresponding weight gains were recorded and studied. The samples were then fired at 1600 °C for 2h under argon flow, and examined via X-ray diffraction (XRD), scanning electron microscopy (SEM) and compression testing. It was found that applying pressure or vacuum produced more effective SiO2 weight gains. Pine showed superior absorption to other types with its maximum obtained value achieved under vacuum followed by pressure. The starting concentration of SiO2 solution proved to be crucial in controlling the final mechanical properties of the specimens. XRD analysis revealed that the resulting samples consisted of nearly pure SiC, and SEM images indicated that the initial structure of wood was retained. Due to the nature of the reactions involved with using SiO2 as a-precursor, the produced specimens tend to be mechanically weak. The new synthesis approach involves the use of