Conversion of wood flour/SiO2/phenolic composite to porous SiC ceramic containing SiC whiskers

Abstract

A novel wood flour/SiO2/phenolic composite was chosen to be converted into porous SiC ceramic containing SiC whiskers via carbothermal reduction. At 1550°C the composite is converted into porous SiC ceramic with pore diameters of 10~40μm, and consisting of β-SiC located at the position of former wood cell walls. β-SiC wire-like whiskers of less than 50 nm in diameter and several tens to over 100 μm in length form within the pores. The surface of the resulting ceramic is coated with β-SiC necklace-like whiskers with diameters of 1~2μm

Evaluating the Sintering Kinetics of Porous Sic Ceramics

“…The shrinkage data was first used in Eq. (2) and was then transferred to Table 1. The fact that the value of R approaches unity shows that the data obtained with the Makipirtti-Meng equation agrees well with the data obtained by the SID method on the shrinkage which occurs during sintering.…”

“…Porous SiC ceramics are widely used as separation media in different sectors of industry due to their high separation efficiency, resistance to heat and corrosion, good mechanical strength, and structural stability [1,2]. However, the covalent nature of the chemical bond in SiC makes it more difficult to sinter pure SiC ceramics at temperatures below 2100°C [3].…”