Synthesis of Ceramic Nanocomposite Powders with in situ Formation of Nanowires/Nanobelts

Abstract

A significant challenge in synthesizing nanowire/nanobelt‐reinforced ceramic nanocomposites is to uniformly disperse these reinforcements. Here, we report the synthesis of amorphous silicon carbonitride powders containing in situ‐formed single‐crystal Si3N4 nanowires and nanobelts via the catalyst‐assisted pyrolysis of a polymeric precursor. The nanowires/nanobelts are uniformly dispersed within the powder matrix. The ratio of nanomaterials to powder can be controlled by tailoring the experimental conditions. The novel powders could be useful for fabricating nanowire/nanobelt‐reinforced ceramic nanocomposites.

Role of Temperature and Nitrogen Flow Rate During the Carbothermic Synthesis of SiC/Si3N4 Nanocomposite Powder from Gel

“…One type is in condensed solid rods and appears dark black in color. These rods are expected to be for the Si 3 N 4 phase as dictated from the shape of Si 3 N 4 nanorods prepared with varying processes 30,36,37 . Whereas, the other type appears in a bamboo‐like structure, which is believed to be assigned for silicon carbide as mentioned by various investigators 34,36,38,39 .…”

An optimized process for in situ formation of multi-walled carbon nanotubes in templated pores of polymer-derived silicon oxycarbide

“…For example, Vakifahmetogluet al [17] described the production of Si 3 N 4 and SiC nanowires using poly(methyl-phenyl)silsesquioxane (PMPS) with a cobalt catalyst. Likewise, singlecrystalline Si 3 N 4 nanowires/nanobelts were produced from polysilazane, using FeCl 2 as catalyst [18]. Yang et al reported SiCnanorods that were synthesized using a similar methodology [19].…”

Growth of One‐Dimensional Nanostructures in Porous Polymer‐Derived Ceramics by Catalyst‐Assisted Pyrolysis. Part I: Iron Catalyst

“…For example, carbon nanotubes (CNTs) were synthesized from a PCS containing iron nanoparticles, 13 or from a borazine‐based precursor including nickel as catalyst, 14 while SiC/SiO 2 core/shell nanocables were produced using poly(dimethylsiloxane) coupled with ferrocene 15 . Likewise, a polysilazane was used to produce amorphous silicon carbonitride (SiCN) powder with in situ ‐grown single‐crystal Si 3 N 4 nanowires/nanobelts, using FeCl 2 as catalyst 16 . A similar methodology was also used to synthesize powders containing SiC nanorods, 17 Si 3 N 4 nanobelts, 18–20 single‐crystalline Si 3 N 4 nanowires with 21 or without 22 aluminum doping, and finally silicon‐doped boron nitride (BN) nanotubes having a bamboo structure 23 .…”