液相接触法生成 TiAl_3 晶须的机理分析  

Analysis of the Growth Mechanism of TiAl 3 Whiskers Obtained by Contact Reaction Method

作　　者：许益民[1] 陈国香[1] 徐春水[1] 杨滨[1] 

机构地区：[1]南昌大学机电学院

出　　处：《南昌大学学报（工科版）》1998年第3期77-80,共4页Journal of Nanchang University(Engineering & Technology)

基　　金：江西省自然科学基金

摘　　要：在分析液相接触反应生成ＴｉＢ２颗粒机制时，发现反应块表面存在一些ＴｉＡｌ３晶须本文用ＳＥＭ分析了反应温度对ＴｉＡｌ３晶须形貌的影响，讨论了ＴｉＡｌ３晶须的生长机理结果表明：ＴｉＡｌ３晶须的长径比随反应温度升高而减少；ＴｉＡｌ３晶须的生长机理为ＶＬＳ机制，但在晶须生长过程中触媒液滴里的Ｔｉ参与了反应。Some TiAl 3 whiskers are found to be produced simultaneously during the formation process of TiB 2 particularly fabricated by in-situ reaction in molten aluminum.The effect of temperature of molten aluminum on the morphologies of the TiAl 3 whiskers and the growth mechanism of the whiskers are studied.The results show that the aspect ratio of the TiAl 3 whiskers decreases with the increase of the temperature.The growth of the whiskers is proved to be controlled by a vapor-liquid-solid(VLS) mechanism.The titanium and aluminum atoms in the catalytic droplet,however,have been confirmed to react with each other,which is different from other whiskers growing by a VLS mechanism where the composition in the catalytic droplet is constant.

关 键 词：TIAL3 晶须 形貌 生长机理 液相接触法 

分 类 号：O784[理学—晶体学]