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For a long time, the solid/liquid/vapour triple point of graphite has been a subject of debate and, despite the progress in the experimental techniques adopted, the uncertainties have become even greater in the last few years. In the experiments described in this paper, spherical graphite specimens were heated by four tetrahedrally orientated laser beams to produce a fairly uniform temperature on the surface. A sufficiently large amount of molten graphite was produced to make it possible to identify the liquid/solid transition by a conventional thermoanalytical method. The temperature was measured by multichannel pyrometry, which enabled a detailed analysis of the perturbations and errors to be carried out. The triple point of graphite was found to be in the interval: T(t) = 4100 +/- 50 K and p(t) = 110 +/- 10 bar.

Additional information

Authors: RONCHI C, JRC Karlsruhe (DE);BEUKERS R, JRC Karlsruhe (DE);HEINZ H, JRC Karlsruhe (DE);HIERNAUT J P, JRC Karlsruhe (DE);SELFSLAG R, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: Second Workshop on Subsecond Thermophysics, Turin (IT), Sept. 20-21, 1990
Availability: Available from (1) as Paper EN 35771 ORA
Record Number: 199111250 / Last updated on: 1994-12-02
Original language: en
Available languages: en