Computation of metastable phases in tungsten-carbon system

被引：16

作者：

Demetriou, MD ^{[1
]}

Ghoniem, NM ^{[1
]}

Lavine, AS ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Mech & Aerosp Engn, Los Angeles, CA 90095 USA

来源：

JOURNAL OF PHASE EQUILIBRIA | 2002年 / 23卷 / 04期

关键词：

D O I：

10.1361/105497102770331550

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Metastable phase equilibria in the W-C system are presented in the vicinity of the metastable reactions involving W2C, WC1-x, and WC. Metastable phase boundaries were obtained by reproducing the stable boundaries using optimized Gibbs energy formulations and extrapolating them into regions of metastability. Four metastable reactions were obtained: a metastable congruent melting reaction of WC at 3106 K, a metastable eutectic reaction between WC1-x and graphite at 2995 K, a metastable eutectic reaction between W2C and WC at 2976 K, and a metastable eutectic reaction between W2C and graphite at 2925 K. The reaction enthalpies and entropies associated with these transitions are also computed using the available Gibbs energy data. Furthermore, possible kinetic paths that could lead to metastability are discussed.

引用

页码：305 / 309

页数：5

共 22 条

[1]

Burden R., 1993, NUMERICAL ANAL, P56

[2] Kinetic modeling of phase selection during non-equilibrium solidification of a tungsten-carbon system [J].

Demetriou, MD ;

Ghoniem, NM ;

Lavine, AS .

ACTA MATERIALIA, 2002, 50 (06) :1421-1432

[3]

DEMETRIOU MD, 2001, THESIS U CALIFORNIA

[4]

Frisk K, 1999, Z METALLKD, V90, P704

[5] CHARACTERIZATION OF AS-PREPARED AND ANNEALED W/C MULTILAYER THIN-FILMS [J].

GONZALEZHERNANDEZ, J ;

CHAO, BS ;

PAWLIK, DA ;

ALLRED, DD ;

WANG, Q .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1992, 10 (01) :145-151

[6] THERMODYNAMIC PROPERTIES OF THE CO-W-C SYSTEM [J].

GUILLERMET, AF .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1989, 20 (05) :935-956

[7]

GUSTAFSON P, 1986, MATER SCI TECH SER, V2, P653, DOI 10.1179/026708386790328957

[8]

Huang WM, 1997, Z METALLKD, V88, P55

[9]

JOHANSSON T, 1978, MET SCI FEB, P83

[10] GLANCING ANGLE EXAFS INVESTIGATIONS OF THE EFFECTS OF ANNEALING ON W-C MULTILAYER COMPOSITION [J].

LAMBLE, GM ;

HEALD, SM ;

SAYERS, DE ;

ZIEGLER, E ;

VICCARO, PJ .

PHYSICA B, 1989, 158 (1-3) :672-673

← 1 2 3 →