SHS of composite ceramics from mechanochemically treated and thermally carbonized SiO<Subscript>2</Subscript> powders

New ceramic composites have been synthesized upon combined use of mechanochemical treatment (MCT) of SiO₂, its thermal carbonization (followed by baking), and SHS in a mixture of thus activated (carbonized) SiO₂ with Al powder. MCT and thermal carbonization were found to result in formation of fiber-like carbon structures on the surface of silica particles. The rigid carbon frameworks formed on the surface of silicon dioxide were found to improve the physicochemical properties of resultant carbon-containing refractory materials.      

Catalysts for processing light hydrocarbon raw stock: Combustion synthesis and characterization

Fiber glass supported nanosized Co and Co-Ni catalysts were prepared by solution-combustion synthesis and characterized for their structure and catalytic activity.     

Effect of the Sapphire-Nitridation Level and Nucleation-Layer Enrichment with Aluminum on the Structural Properties of AlN Layers

The effect of atomic aluminum deposited onto sapphire substrates with different nitridation levels on the quality of AlN layers grown by ammonia molecular-beam epitaxy is investigated. The nitridation of sapphire with the formation of ~1 monolayer of AlN is shown to ensure the growth of layers with a smoother surface and better crystal quality than in the case of the formation of a nitrided AlN layer with a thickness of ~2 monolayers. It is demonstrated that the change in the duration of exposure of nitrided substrates to the atomic aluminum flux does not significantly affect the parameters of subsequent AlN layers.