Induction plasma synthesis of ultrafine SiC

Abstract

Abstract. Induction plasma synthesis of ultrafine powders has been studied using different precursors, different plasma torch configurations and injection conditions.

Thermal Plasma Synthesis of Nano-Sized Powders

“…If the reactive gases, such as, oxygen and nitrogen, are used as one of the main constituents to form a plasma flame, however, chemical reactions between the radical reactive species and the heated precursors can be conducive to synthesis of nano-sized materials. Many kinds of oxides, carbides and nitrides have been synthesized in this way [10,[71][72][73][74]. For example, nano-sized Al2O3 or TiO2 particles can be easily obtained by in-flight treatment of Al metal or titanium hydrides in oxidative thermal plasma [71,72].…”

“…Since the oxidation reaction of metal is normally exothermic, these processes can be more energy effective compared with size reduction of micron-sized Al2O3 or TiO2 precursors into nano-sized particles. In addition to these nano-sized oxide powders, a variety of carbides with submicron sizes, such as, nano-sized SiC, WC and TiC, have been prepared using reactive thermal plasmas [73][74][75][76][77]. In these applications, liquid or gaseous hydrocarbons, such as methane, can be adopted as a cheap and commercially useful carbon source [73][74]77].…”

“…In addition to these nano-sized oxide powders, a variety of carbides with submicron sizes, such as, nano-sized SiC, WC and TiC, have been prepared using reactive thermal plasmas [73][74][75][76][77]. In these applications, liquid or gaseous hydrocarbons, such as methane, can be adopted as a cheap and commercially useful carbon source [73][74]77]. As for the cation sources for those covalent and metallic carbides, metal powder itself or chemicals containing each metal cation can be used, depending on the thermodynamics of targeted materials and the types of plasma torches.…”

Sintering and mechanical properties of β‐SiC powder obtained from waste tires

“…In order to obtain high performance SiC ceramics, several alternative methods have hence been proposed for the synthesis of high purity and selected quality powder over the last decades. Among these, the most  common methods are: physical vapor transport (PVT) technique, chemical vapor deposition (CVD), self-propagating high temperature synthesis (SHS), sol-gel, microwave, and plasma driven reactions [6][7][8][9][10][11][12]. In addition, special attention was given in recent years towards synthesis of nanosized SiC powder to allow the production of high performance products like structural components.…”

“…Ultrapure β-SiC powder was successfully synthesized in RF-plasma systems from different types of precursors, such as silicon and CH 4 [13,14], trichloromethyl silane [15], silicon monoxide and methane [16], chlorosilane and methane [17], organosilanes [18], and coarse SiC powder [19]. Furthermore, many efforts have been made to produce SiC and other technical ceramics from secondary raw materials like biomass residues (e.g., rice husk) and wastes [12,[20][21][22]. In this last context, even more recently, plasma technique was applied for the synthesis of SiC powder using low cost silica and carbonaceous residue of tire pyrolysis as starting materials [23].…”