Thermophysical properties of graphite HOPG and HAPG in the solid state and under melting (from 2000 K up to 5000 K)

被引：0
|
作者：
Savvatimskiy, A. I. [1 ]
Onufriev, S. V. [1 ]
Konyukhov, S. A. [1 ,2 ]
机构：
[1] Russian Acad Sci, Joint Inst High Temp, Izhorskaya Str 13,Bd 2, Moscow 125412, Russia
[2] Natl Res Nucl Univ MEPhI, Kashirskoe Shosse 31, Moscow 115409, Russia
来源：
INTERNATIONAL CONFERENCE PROBLEMS OF THERMAL PHYSICS AND POWER ENGINEERING (PTPPE-2017) | 2017年 / 891卷
基金：
俄罗斯科学基金会;
关键词：
HIGH-TEMPERATURE PROPERTIES; CARBON;
D O I：
10.1088/1742-6596/891/1/012319
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Experiments with HOPG graphite grade showed that the melting temperature of graphite equals 4800-4900 K and that the melting of graphite is possible only at elevated pressures. The data were obtained for resistivity, specific heat and input (Joule) energy up to 5000 K. HAPG (Highly Annealing Pyrolytic Graphite) is a form of highly oriented pyrolytic graphite. HAPG specimens in the form of strips (thickness 30 microns) were placed in a cell (between two plates of glass-sapphire). The specimen temperature was measured by a high speed pyrometer. The heat of fusion for both graphite grades (heated in a confined volume) was less (and specific heat - higher) than for the case with nearly free expansion. A possible reason for the observed effects is discussed in the report.
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页数：9
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