Effect of Silicon Source on Biomorphic SiC Fibers Converted from Natural Fibers

doi:10.15541/jim20140376

Abstract

Abstract:

Converting the natural fibers into biomorphic ceramics has been a novel and promising method to produce porous ceramics. This research explored a novel preparation method of biomorphic SiC fibers (SiC_f), and its silicon source’s effects on the production. The results suggest that the silicon in vapor, compared to melting silicon, can provide much slower reaction velocity which can enable the reaction more controllable, leading to stronger mechanical properties of the final product, the SiC fiber. Besides, different kinds of silicon sources have great difference in influence on the reaction rate, temperature, grain size and purity. Among the silicon sources, SiO is an ideal source of the porous SiC fiber.

Key words: natural fibers, SiC fiber, porous ceramics, silicon source

CLC Number:

TB321

YUAN Wen-Yu, CHENG Lai-Fei,WU Heng, LIU Yong-Sheng. Effect of Silicon Source on Biomorphic SiC Fibers Converted from Natural Fibers[J]. Journal of Inorganic Materials, 2015, 30(2): 159-164.

Figures/Tables 8

Fig. 1 The device of the reaction between plant fibers and Si-vapor

Fig. 2 XRD patterns of the products that different states of silicon react with sisal fibers (carbide phases)

Fig. 3 SEM images of the products produced by different states of silicon reaction with sisal fibers (carbide phases)

Fig. 4 XRD patterns of products that jute fibers vitrified with different silicon sources * Indicates stacking falts ([24, 32])

Fig. 5 SiC fibers’ cross-section and surface SEM images of the products prepared by Si (a, b), SiO2 (c, d) and Si+SiO2 (e, f) reaction with jute fibers (carbide phases)

Fig. 6 SEM images of jute (a, b) and sisal fibers (c, d) infiltrated with silicon vapor at 1800 ℃

Fig. 7 XRD patterns of products prepared under different time (a) and different temperature (b)

Fig. 8 SEM images of SiC fibers prepared by using jute fibers under 1650℃ (a, b) and 1800℃ (c, d)

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