Preparation of Biomorphic Porous SiC Ceramics from Bamboo by Combining Sol–Gel Impregnation and Carbothermal Reduction

Abstract

This study investigated the feasibility of using bamboo to prepare biomorphic porous silicon carbide (bio-SiC) ceramics through a combination of sol–gel impregnation and carbothermal reduction. The effects of sintering temperature, sintering duration, and sol–gel impregnation cycles on the crystalline phases and microstructure of bio-SiC were investigated. X-ray diffraction patterns revealed that when bamboo charcoal–SiO2 composites (BcSiCs) were sintered at 1700 °C for more than 2 h, the resulting bio-SiC ceramics exhibited significant β-SiC diffraction peaks. In addition, when the composites were sintered at 1700 °C for 2 h, scanning electron microscopy micrographs of the resulting bio-SiC ceramic prepared using a single impregnation cycle showed the presence of SiC crystalline particles and nanowires in the cell wall and cell lumen of the carbon template, respectively. However, bio-SiC prepared using three and five repeated cycles of sol–gel impregnation exhibited a foam-like microstructure compared with that prepared using a single impregnation cycle. Moreover, high-resolution transmission electron microscopy and selected area electron diffraction revealed that the atomic plane of the nanowire of bio-SiC prepared from BcSiCs had a planar distance of 0.25 nm and was perpendicular to the (111) growth direction. Similar results were observed for the bio-SiC ceramics prepared from bamboo–SiO2 composites (BSiCs). Accordingly, bio-SiC ceramics can be directly and successfully prepared from BSiCs, simplifying the manufacturing process of SiC ceramics.

Advancements in silicon carbide-based supercapacitors: materials, performance, and emerging applications

“…Additionally, the introduction of surfactants or modifying agents can be employed to finely adjust the size, surface area, and porosity of the resulting SiC nanomaterials. 95,96 The sol-gel technique facilitates the production of materials with diverse morphologies and structures. For instance, Guo et al devised a modified sol-gel method for preparation of mesoporous silicon carbide, which involved the use of TEOS and phenolic resin to create a binary carbonaceous silicon xerogel.…”

“…Additionally, the introduction of surfactants or modifying agents can be employed to finely adjust the size, surface area, and porosity of the resulting SiC nanomaterials. 95,96…”

Low-temperature thermally modified fir-derived biomorphic C–SiC composites prepared by sol-gel infiltration

“…J o u r n a l P r e -p r o o f 3 Several technologies have been developed to prepare biomorphic SiC composites, including melt infiltration (MI), chemical vapor infiltration (CVI), molten salt infiltration (MSI), sol-gel infiltration (Sol-gel), slurry infiltration (SI) and polymer precursor infiltration (PPI) [6,13,[15][16][17][18][19]. Compared with the above methods, the solgel infiltration method has some advantages including lower material costs, a simpler production process, and the ability to maintain the structure and morphology of the initial template integrally [20,21].…”

“…Compared with the above methods, the solgel infiltration method has some advantages including lower material costs, a simpler production process, and the ability to maintain the structure and morphology of the initial template integrally [20,21]. The mechanical properties of biomorphic SiC composites prepared by MI have been reported, while those produced by CVI, Sol-gel and SI have barely been reported, probably owing to the inhomogeneous microstructure [7,11,13,16,20,[22][23][24][25].…”

Advances in Wood Composites

“…Another interesting topic is the preparation of biomorphic porous SiC ceramics from bamboo by combining sol-gel impregnation and carbothermal reduction [31]. This study investigated the feasibility of using bamboo to prepare biomorphic porous silicon carbide (bio-SiC) ceramics through a combination of sol-gel impregnation and carbothermal reduction.…”