Crystal growth of radiating filaments of α-SiC formed by the conically converging shock-wave technique

Formation of Carbon Onion from Heavily Shocked SiC

“…Formation of carbon onions under shock conditions using explosives has been reported. , In plate-impact experiments, however, it is reported that carbon precursors (furfural resin: carbon ∼ 90%, oxygen ∼ 7%, hydrogen ∼ 3%) mixed with copper powder was transformed into only diamond with no trace of carbon onions in the recovered samples . In either case, the starting carbon materials are considered decomposed or melted.…”

“…In either case, the starting carbon materials are considered decomposed or melted. We conducted a plate-impact shock experiment with similar shock conditions as in ref , but used SiC (almost pure 6H type) as a source of carbon instead of carbon soot because SiC decomposes under strong shock conditions . The SiC polycrystalline powder (5 wt %) mixed with copper powder (95 wt %) was pressed into a stainless steel capsule and used as a sample.…”

Geochemistry of carbon in terrestrial impact processes

“…In CVD experiments diamond commonly grows on silicon-containing substrates and does so via an interfacial layer of 4H-SiC (Sato & Kamo 1992)./3-SIC and 2H-SiC are believed to be the low-temperature forms of the mineral (produced from 1500 to 2000°C) whereas oz-SiC (4H, 6H, 8H) is the higher-temperature polytype (Yamada & Tobisawa 1990). Furthermore, 4H-SiC has the highest growth rate of any of the silicon carbide polytypes produced during epitaxial growth by sublimation onto Si surfaces (Kalnin et al 1994).…”

“…SiC has not been observed amongst the products of shock experiments performed under a variety of conditions to produce diamond. However, c~-SiC can be produced from a vapour containing silicon and carbon created by shaped charge experiments to shock powdered/3-SIC (Yamada & Tobisawa 1990).…”

Shock Synthesis of a Graphitic Boron‐Carbon‐Nitrogen System

“…To the author's knowledge, direct shock synthesis of a g-B-C-N system from BN and condensed carbon has not been accomplished. The author has applied this technique to study the crystal-growth mechanisms of fine particles from vapor under chaotic conditions 6,7 and to produce superhard materials from powdered substances. 8 The superhard materials have been prepared from several types of fine B 4 C particles via condensation of the vapor generated from the powdered mixture of amorphous boron nitride/carbon black (a-BN/CB).…”