Al对Ti-B_4C-蔗糖(C的前驱体)体系的影响  

Influence of Al on Reactive System of Ti-B_4C-sucrose (Precursor of Carbon)

作　　者：杨月英[1] 王建江[2] 

机构地区：[1]青岛理工大学理学院,山东青岛266000 [2]石家庄军械工程学院,河北石家庄050003

出　　处：《热加工工艺》2009年第6期72-75,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(50672130)

摘　　要：以Ti-B4C-蔗糖(C的前驱体)为主体系,添加5wt%Al进行自反应喷射成形复相结构陶瓷坯件试验,分析Al对其反应特性的影响。结果表明:Al的加入降低了体系中所有反应的起始温度,促进了体系的燃烧合成与反应转化,并生成了TiAl2和Al2O3新相;Al的加入缩短了喷射粒子转化为陶瓷液滴的时间,促进了目标产物碳氮化钛和硼化钛的生成;Al的加入使金属的氧化由钛的一元氧化变为钛、铝的二元氧化,并因铝的选择性氧化而抑制了自反应喷射成形过程中Ti的氧化,使喷射沉积坯件内不含副产物相TiO2,这些对控制喷射沉积工艺和改善沉积坯件的组织结构有利。Taking Ti-B4C-sucrose （precursor of carbon） as the main reactive system, and adding 5wt% Al, tests of self-reactive spray forming multi-phase structural ceramic blanks were carried out. The influence of Al on the SHS reactive characters was analyzed. The results show that adding Al not only decreases the initial temperature of all reactions, accelerates the reactive transformation of the system, leads to the forming of new phases of TiAl2 and Al2O3, shortens the forming time of the ceramic beads, but also makes the monadic oxidation of Ti transform to binary oxidation of Ti and Al, which protects Ti form oxidation and obtains undesirable product of TiO2 in the blanks. So adding Al is beneficial to control the self-reactive spray forming process and improve the structure of blanks.

关 键 词：自反应喷射成形 添加剂 复相结构陶瓷 氧化与氮化 

分 类 号：TB332[一般工业技术—材料科学与工程]