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survival of diamond at 2200 °c in hydrogen论文.pdf


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survival of diamond at 2200 °c in hydrogen论文.pdf
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DIAMOND
AND
RELATED
MATERIALS
ELSEVIER Diamond and Related Materials 5 (1996) 1246-1248

Survival of diamond at 2200 °C in hydrogen

S. Kumar, P. Ravindranathan, H.S. Dewan, R. Roy
IntercoIlege Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
Received 23 August 1995; accepted in final form 10 April 1996


Abstract

A modified strip furnace was used to heat diamond crystals of various sizes (1-10 gm) to 2200 °C in a hydrogen atmospheres
(1 atm total pressure), and their thermal stability and growth were investigated. Graphite fibers coated with l, 5 and 10 gm
diamond seeds were used as the resistive element in the modified strip furnace and heated in the hydrogen atmosphere. It was
found that diamond seeds of these sizes survive in a hydrogen atmosphere at temperatures as high as 2200 °C. Considerably
smaller crystals (compared with the original diamond seeds) are also observed on the surface of the graphite fibers, suggesting new
diamond growth under these conditions.

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