THERMAL-CONDUCTIVITY AND ELECTRICAL-RESISTIVITY OF CEMENTED TRANSITION-METAL CARBIDES AT LOW-TEMPERATURES

被引:21
作者
FRANDSEN, MV [1 ]
WILLIAMS, WS [1 ]
机构
[1] UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801
关键词
CARBIDES; THERMAL CONDUCTIVITY; ELECTRICAL RESISTIVITY; TRANSITION METALS; COMPOSITES;
D O I
10.1111/j.1151-2916.1991.tb04121.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The thermal conductivity, K, and electrical resistivity, rho, of cemented transition-metal carbides-a class of composites of high toughness-were measured for the first time at cryogenic temperatures. The dependence of these quantities on composition, grain size, and binder content was explored. The major qualitative findings are the following: (1) K for WC/Co grades has a gentle maximum ranging from 80 to 160 W/(m.K) around 150 K; (2) WC/Co has higher values of K and lower values of rho than TiC(x)/NiMo, because of vacancy scattering of electrons and phonons in the latter; (3) grades with larger grains have higher values of K; (4) grades with higher percentages of binder phase have lower values of K; (5) the lattice and electronic components of K are comparable for TiC(x)/NiMo; (6) multicarbide grades have lower values of K than WC/Co; (7) a Callaway analysis of the lattice component of K identifies scattering of phonons by grain boundaries, point defects, electrons, and other phonons as significant for these materials, with defect scattering dominating in the liquid-nitrogen range.
引用
收藏
页码:1411 / 1416
页数:6
相关论文
共 12 条
  • [1] AMBIPOLAR DIFFUSION CONTRIBUTION TO HIGH-TEMPERATURE THERMAL-CONDUCTIVITY OF TITANIUM CARBIDE
    BETHIN, J
    WILLIAMS, WS
    [J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1977, 60 (9-10) : 424 - 427
  • [2] CALLAWAY J, 1959, PHYS REV, V113, P1048
  • [3] Note on the conduction of heat in crystals
    Casimir, HBG
    [J]. PHYSICA, 1938, 5 : 495 - 500
  • [4] Frandsen M. V., 1987, THESIS U ILLINOIS UR
  • [5] Neumann W, 1984, THERMAL CONDUCTIVITY, V18, P473
  • [6] PERECHERLA R, 1988, J AM CERAM SOC, V71, P1130
  • [7] PIPPARD AB, 1955, PHILOS MAG, V46, P1104
  • [8] LATTICE THERMAL CONDUCTIVITY OF SUPERCONDUCTING NIOBIUM CARBIDE
    RADOSEVI.LG
    WILLIAMS, WS
    [J]. PHYSICAL REVIEW, 1969, 188 (02): : 770 - &
  • [9] PHONON SCATTERING BY CONDUCTION ELECTRONS AND BY LATTICE VACANCIES IN CARBIDES OF TRANSITION METALS
    RADOSEVI.LG
    WILLIAMS, WS
    [J]. PHYSICAL REVIEW, 1969, 181 (03): : 1110 - &
  • [10] Schwarzkopf P., 1960, CEMENTED CARBIDES, P158