Utilization of Chemically Synthesized Fine Powders of SiC/Al₂O₃Composites for Sintering

Recent Advances and Future Prospects in Spark Plasma Sintered Alumina Hybrid Nanocomposites

“…Finally, the Al 2 O 3 -CNTs nanocomposite was obtained by calcination of the dried gel powder. Recently, the sol-gel process, following a chemical route named the pyrophoric technique, was used to uniformly disperse high volume fraction of SiC particles in alumina [46]. In another investigation, aluminum oxide, titanium oxide, magnesium oxide, silicon oxide powders, and a mixture of them have been prepared by the sol-gel method for the development of advanced polycrystalline ceramics [47].…”

“…Furthermore, the excellent physical properties of the reinforcements contribute to the improvement of the electrical and thermal properties of alumina. For example, SiC is known to have a hardness of approximately 30 GPa as compared to the hardness of alumina, which is approximately 17.65 GPa [46]; CNTs have high stiffness of around 1 TPa [76,77] and tensile strength up to 60 GPa [78]. Furthermore, graphene, a two-dimensional material consisting of sp 2 -hybridized carbon atoms, which is believed to be the strongest material, has exceptional mechanical properties.…”

“…This is specifically important if a nanopowder matrix is reinforced with nanoparticles, nanotubes, and nanosheets to prepare a hybrid nanocomposite powder. Methods, such as simple wet dispersion and probe sonication [35,36], ball milling [24,32,37,38,39,40,41], molecular level mixing [21,26,42,43], sol-gel processing [44,45,46,47], and colloidal processing [22,23,35,48,49] were used to improve the dispersion of the reinforcements in alumina matrix.…”

Effect of Mechanical Alloying in Polymer-Ceramics Composites

“…As schematically drawn in the figure, in the intra-and intergranular nanocomposites, the nano-size particles are dispersed mainly within the matrix grains or at the grain boundaries of the matrix, respectively. Their aim is to improve not only the mechanical properties such as hardness, fracture strength and toughness, and reliability at room temperature but also high-temperature mechanical properties such as hardness strength and creep and fatigue fracture resistances (Mohanty et al 2016;Sternitzke et al 1997).…”

Synthesis of High-Purity Silica Nanoparticles by Sol-Gel Method

“…The addition of silica nanoparticles improves thermal, mechanical, physical and chemical properties of functional materials [13]. High purity silica is a precursor for the synthesis of silicon carbide, which is widely used in industry [14]. The ability of colloidal SiO 2 to form films as well as its thermal stability, strength, adhesion and electric properties make it possible to use silica sols for the development of anticorrosive, insulating and high-tem-perature composite coatings [15,16].…”