Silicon carbide gemstones

Details Silicon carbide gemstones Silicon carbide gemstones

C - Chemistry, Metallurgy

30

B

C30B 29/36 (2006.01) A44C 17/00 (2006.01) C30B 23/00 (2006.01)

Patent

CA 2230262

Synthetic gemstones having extraordinary brilliance and hardness are formed from large single crystals of relatively low impurity, translucent silicon carbide of a single polytype that are grown in a furnace sublimation system. The crystals are cut into rough gemstones that are thereafter fashioned into finished gemstones. A wide range of colors and shades is available by selective doping of the crystal during growth. A colorless gemstone is produced by growing the crystal undoped in a system substantially free of unwanted impurity atoms.

Pierres précieuses synthétiques de brillance et dureté extraordinaires, formées de grands monocristaux translucides de carbure de silicium à impureté relativement faible d'un seul polytype, produits par croissance dans un système de sublimation en four. Les cristaux sont découpés en pierres précieuses brutes qui sont ensuite façonnées en pierres finies. Une large gamme de couleurs et de nuances peut être obtenue par un dopage sélectif du cristal pendant la croissance. On obtient une pierre incolore en faisant croître le cristal sans dopage dans un système sensiblement dépourvu d'atomes d'impuretés indésirables.

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