Synthesis ofβ-SiAlON whiskers: dependence of uniform morphology upon preparation conditions

Abstract

b-SiAlON whiskers with uniform morphology were prepared using reaction sintering method under different conditions. The effect of preparing conditions on the morphology of b-SiAlON whiskers was systematically studied by SEM, XRD, TEM and HRTEM. The results showed that single crystalline b-SiAlON whiskers with uniform morphology were successfully fabricated at 1773 K for 6 h under flowing nitrogen atmosphere. The well synthesised whiskers were of several hundreds of nanometres in diameter and a few hundreds of micrometres in length. Although the morphology and its size distribution are mainly determined by the reaction temperature and holding time, they can also be tailored by controlling the reaction atmosphere. The ratio of staring materials has no significant influence on the morphology of b-SiAlON whiskers. The growth of b-SiAlON whiskers follows a vapour-solid mechanism, and the formation of the belt-like whiskers is attributed to an anisotropic growth at the early nucleation/growth stage.

Carbothermal/aluminothermic reduction nitridation synthesis of ZrN–SiAlON refractory composites from zircon and bauxite: a comparative study of the reduction effect of reducers

“…Ji et al [17] reported that the pea-like grain could be regarded as the precursor grains of SiAlON whiskers. It was interesting to obtain the formation mechanism of β-SiAlON, which prefers a documented vapour-liquid-solid (VLS) (Figure 5) mechanism of β-SiAlON formation from a previous reported research [20][21][22]. The process of producing β-SiAlON was as follows: (1) forming the Si-Al-P liquid, including Si, Al, impurity like Fe at lower temperatures; (2) the dissolution of gas, such as…”

Synthesis and microstructure evolution of β‐Sialon fibers/barium aluminosilicate (BAS) glass‐ceramic matrix composite with enhanced mechanical properties

“…It has been demonstrated that one‐dimensional materials, such as nanowires, whiskers, and fibers, exhibit unique structures and properties, which are exploited to build up nano‐scale reinforcements 26‐29 . Significant efforts have been devoted for in situ synthesizing one‐dimensional Sialon materials inside ceramic matrix materials 30‐32 . In these researches, one‐dimensional Sialon materials were synthesized successfully inside matrix; however, there still exists some problems that need to be further explored and discussed.…”

“…[26][27][28][29] Significant efforts have been devoted for in situ synthesizing one-dimensional Sialon materials inside ceramic matrix materials. [30][31][32] In these researches,…”