Preparation and growth mechanism of TaCx whiskers

被引:62
作者
Chen, YJ [1 ]
Li, JB [1 ]
Wei, QM [1 ]
Zhai, HZ [1 ]
机构
[1] Tsing Hua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
crystal morphology; growth models; X-ray diffraction; tantalum compounds;
D O I
10.1016/S0022-0248(01)00673-X
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Tantalum carbide (TaCx) whiskers were successfully synthesized via different methods and different starting raw materials in the presence of Ni powder used for the catalysis of the synthesis. In the Ta2O5-NaCl-C-Ni and Ta2O5NaF-C-C 12H22O11 (sucrose) systems the whiskers grew via a vapor-liquid-solid (VLS) mechanism and exhibit a fairly straight fiber morphology. In the Ta2O5-KCl-C-Ni system, some whiskers grew via a VLS mechanism and others via a LS mechanism. Some whiskers grew with a zigzag shape tip and conical shaped morphology. All whiskers were grown under similar reaction conditions at temperatures which range from 1150 degreesC to 1350 degreesC in a nitrogen ambient atmosphere. The compositions, morphology, crystal structure and growth mechanism were investigated in detail. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:244 / 250
页数:7
相关论文
共 17 条
  • [1] Carbothermal synthesis of TiC whiskers via a vapor-liquid-solid growth mechanism
    Ahlen, N
    Johnsson, M
    Nygren, M
    [J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1996, 79 (11) : 2803 - 2808
  • [2] Oxidation behaviour of TaxTi1-xC and TaxTi1-xCyN1-y whiskers
    Ahlén, N
    Johnsson, M
    Nygren, M
    [J]. THERMOCHIMICA ACTA, 1999, 336 (1-2) : 111 - 120
  • [3] AISSANI FB, 1993, CARBON, V31, P21
  • [4] The growth patterns and morphologies of carbon micro-coils produced by chemical vapor deposition
    Chen, XQ
    Motojima, S
    [J]. CARBON, 1999, 37 (11) : 1817 - 1823
  • [5] GUO QW, 1997, TANTALUM COMPOUNDS E, V15, P636
  • [6] HASHISHIN T, 1997, J CERAM SOC JAPAN IN, V105, P537
  • [7] Carbothermal synthesis of TaC whiskers via a vapor-liquid-solid growth mechanism
    Johnsson, M
    Nygren, M
    [J]. JOURNAL OF MATERIALS RESEARCH, 1997, 12 (09) : 2419 - 2427
  • [8] Kukovitsky EF, 1998, MOL CRYST LIQ CRYS C, V10, P165
  • [9] Li JB, 1998, J AM CERAM SOC, V81, P1689
  • [10] GROWTH OF BETA-SILICON CARBIDE WHISKERS BY THE VLS PROCESS
    MILEWSKI, JV
    GAC, FD
    PETROVIC, JJ
    SKAGGS, SR
    [J]. JOURNAL OF MATERIALS SCIENCE, 1985, 20 (04) : 1160 - 1166