Mandal, Pijush Kanti and Majumdar, Rabindranath and Mukherjee, Kalyan Kumar and Chakrabarti, Omprakash and Maiti, Himadri Sekhar (2009) Active cellular preform derived from stems of jute and sticks of cane and their suitability for bulk porous Si/SiC ceramics. Journal of Porous Materials, 16 (2). pp. 157-163. ISSN 1380-2224

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Stems of Jute (Corchorus capsularis L.) and sticks of Cane (Calamus rotang L.), plants of immense economic importance in the Indian subcontinent, were converted into carbonaceous perform (C-preform) maintaining the circular cylindrical shapes in lengths of 0.02-0.05 m by controlled thermal processing. Plant material precursors were characterized by analysis of elemental (C, H, N) and molecular (cellulose, hemicellulose, lignin) compositions, by determination of Bulk Density (BD) and ash content and by optical microscopy and X-ray diffractometry (XRD). C-preforms were also characterized by measurement of BD and by Scanning Electron Microscopy (SEM) and XRD. The C-preforms were further subjected to infiltration with Si-melt (1823-1923 K) under vacuum. Spontaneous infiltration and reaction yielded composite ceramics preserving the morphology of native Jute Stem (JS) and Cane Stick (CS) precursors on macro and micro scale. The materials were found to be duplex composites with Si and beta-SiC as crystalline phases. The end ceramics were characterized by measurement of BD, and also by SEM and by XRD. Measured mean BD of the Si/SiC composites derived from JS and CS were 2190 Kg m(-3) and 2250 Kg m(-3). The respective volume fractions of large diameter (> 100 mu m) bulk pores were 0.134 and 0.204, in the composites derived from JS and CS. Taking into account the measured volume fraction internal pores of 0.11 and 0.149, the volume fractions of SiC were calculated to be 0.136 and 0.307 in the composites derived from JS and CS respectively, closely tallying with those calculated from the C-preform bulk densities. The cellular Si/SiC ceramics derived from JS and CS having special morphologies with long and large porous channels and oriented growth of constituent phases are likely to be suitable for devices such as high temperature insulators, catalyst support structures for gas phase reactions at elevated temperatures, molten metal filters and others.

Item Type: Article
Uncontrolled Keywords: Jute stem; Cane stick; Cellular carbonaceous preform; Composite; Si/SiC ceramics; Porous cellular ceramics
Subjects: Engineering Materials
Divisions: Non-Oxide Ceramics & Composites
Depositing User: Bidhan Chaudhuri
Date Deposited: 27 Feb 2012 11:51
Last Modified: 27 Feb 2012 11:51

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