不同气氛下球磨时钛的固态—气态反应过程  

SOLID–GAS REACTIONS DURING BALL MILLING OF TITANIUM POWDER UNDER DIFFERENT ATMOSPHERES

作　　者：吕春菊[1] 李宗全[2] 

机构地区：[1]中国计量学院材料学院,杭州310018 [2]浙江大学材料与化学工程学院,杭州310027

出　　处：《硅酸盐学报》2007年第12期1618-1621,1629,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50472060)资助项目。

摘　　要：用球磨法研究过渡金属钛(Ti)在2种不同气氛条件下发生固态–气态反应的结构转变过程。2种不同气氛条件是指密闭气氛(即球磨罐内空气与外界大气隔绝)和连通气氛(即罐内空气与外界大气时刻相通)。实验表明:在2种气氛下的球磨初始阶段,Ti均优先吸附空气中的氮气(N2),形成N含量高的Ti的固溶相[hcp-Ti(O,N)x],然后通过扩散作用转变成新相钛氮氧化物[fcc-Ti(O,N)y]相,其晶体结构与面心立方的氮化钛(TiN)相同。在2种不同气氛条件下的球磨效率不同,密闭气氛下Ti吸附N和氧(O)的速率均快于连通气氛下的。当Ti粉末在密闭气氛下球磨90h后,固态–气态反应的最终产物为单相的纳米晶fcc-Ti4(O0.2N0.8)3。当Ti粉末在连通气氛下球磨相同时间后,产物中hcp-Ti(O,N)x、fcc-Ti(O,N)y和金红石型TiO2三相共存。The structural evolution of titanium powder by ball milling under two different conditions （closed vial and open vial） with solid-gas reactions was investigated. The experimental results show that at the initial stage of ball milling, many more nitrogen atoms are adsorbed by titanium than oxygen atoms and a titanium solid solution phase hcp-Ti（O,N）x with higher nitrogen is formed first. It is then transformed into a titanium oxynitride phase fcc-Ti（O,N）y with the same crystal structure as that of fcc-TiN. However, the efficiency in a closed vial is higher than that in an open vial, and much more nitrogen and/or oxygen is adsorbed by titanium in a closed vial. After milling for 90 h in a closed vial, a nano-crystalline fcc-Ti4（O0.2N0.8）3 is obtained. When titanium is ball milled for the same time in an open vial, hcp-Ti（O,N）x, fcc-Ti（O,N）y and rutile-TiO2 coexist.

关 键 词：固态-气态反应 结构转变 球磨 

分 类 号：TQ13[化学工程—无机化工]