不同形貌TaCx晶须的制备及生长机理

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材料工程 ›› 2002, Vol. 0 ›› Issue (10) : 15-18.

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研究与应用

不同形貌TaC_x晶须的制备及生长机理

陈拥军, 李建保, 魏强民, 翟华嶂

作者信息 +

Preparation and Growth Mechanism of Different Morphological TaC_x Whiskers

CHEN Yong-jun, LI Jian-bao, WEI Qiang-min, ZHAI Hua-zhang

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文章历史 +

摘要

通过不同的原料体系在合适的工艺条件下成功制备出碳化钽晶须(TaC_x)。由Ta₂O₅-NaCl-C-Ni和Ta₂O₅-NaF-C-C₁₂H₂₂O₁₁(蔗糖)体系制备的晶须呈平直的纤维形态,其生长机理为气-液-固(VLS)机制。由Ta₂O₅-KCl-C-Ni体系制备的晶须一部分通过VLS机理生长,而另一部分则通过LS机理生长,前者呈四方柱状,后者呈具有锥状柱体和之字形端部的特殊形貌。所有的原料体系均是在相近的工艺条件下进行,即反应温度1150～1350℃,氮气气氛保护。本工作对晶须的化学成分、形貌、晶体结构和生长机理进行了较详细的研究。

Abstract

Tantalum carbide (TaC_x) whiskers were successfully synthesized via different methods and different starting raw materials in the presence of Ni powder used for the catalysis of synthesis. In the Ta₂O₅-NaCl-C-Ni and Ta₂O₅-NaF-C-C₁₂H₂₂O₁₁(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℃ to 1350℃ in a nitrogen ambient atmosphere. The compositions, morphology, crystal structure and growth mechanism were investigated in detail.

导出引用

陈拥军, 李建保, 魏强民, 翟华嶂. 不同形貌TaC_x晶须的制备及生长机理[J]. 材料工程, 2002, 0(10): 15-18

CHEN Yong-jun, LI Jian-bao, WEI Qiang-min, ZHAI Hua-zhang. Preparation and Growth Mechanism of Different Morphological TaC_x Whiskers[J]. Journal of Materials Engineering, 2002, 0(10): 15-18

中图分类号： TQ174

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