Graphite melting under laser pulse heating

For a long time, the solid/liquid/vapor triple point of graphite has been a subject of debate, and despite the progress in the experimental techniques adopted, the uncertainties became even greater in recent years. In the experiments described in this paper spherical graphite specimens were heated b...

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Bibliographic Details
Published in:International Journal of Thermophysics; (United States) 1992, Vol.13 (1), p.107-129
Main Authors: RONCHI, C, BEUKERS, R, HEINZ, H, HIERNAUT, J. P, SELFSLAG, R
Format: Article
Language:English
Subjects:
CARBON
Condensed matter: structure, mechanical and thermal properties
DATA
DATA COVARIANCES
ELEMENTAL MINERALS
ELEMENTS
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
EXPERIMENTAL DATA
GRAPHITE
HEATING
INFORMATION
LASER-RADIATION HEATING
MATERIALS SCIENCE
MEASURING INSTRUMENTS
MELTING
MICROSTRUCTURE
MINERALS
NONMETALS
NUMERICAL DATA
PHASE STUDIES
PHASE TRANSFORMATIONS
Physics
PLASMA HEATING 360602 > Other Materials-- Structure & Phase Studies
PYROMETERS
Specific phase transitions
TEMPERATURE MEASUREMENT
TRIPLE POINT
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Summary:For a long time, the solid/liquid/vapor triple point of graphite has been a subject of debate, and despite the progress in the experimental techniques adopted, the uncertainties became even greater in recent years. In the experiments described in this paper spherical graphite specimens were heated by four tetrahedrally oriented 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 determined to be T[sub t] = 4100 [+-] 50 K and p[sub t] = 110 [+-] 10 bar. 22 refs., 17 figs., 2 tabs.
ISSN:0195-928X
1572-9567
DOI:10.1007/BF00503360