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作 者:王文娟[1] 冯可芹[1] 杨屹[1] 连姗姗[1] 吴金岭[1]
机构地区:[1]四川大学,四川成都610065
出 处:《稀有金属材料与工程》2009年第A01期234-238,共5页Rare Metal Materials and Engineering
基 金:国家自然科学基金青年基金资助项目(50404014);中国博士后科学基金资助项目(20060390177)
摘 要:采用Gleeble-3500D热模拟机,通过对Fe-V-C粉末压坯分别升温至400~1100℃的解析实验,研究Fe-V-C体系在电场作用下燃烧合成的显微组织转变。结果表明:在电场和热场的共同作用下,体系的点火温度可大幅度降低。在加热早期400℃之前,体系虽未发生化学反应,但显微结构在一定程度上发生变化;当加热温度在400~540℃范围内时,体系被点燃发生"热爆"现象,在燃烧合成反应前期,生成了V2C;当加热温度提高到540~650℃,碳化钒产物除了V2C,还有V8C7、V6C5生成;随加热温度进一步提高到650~1100℃,V2C逐渐消失,V和C的合成产物只有V8C7和V6C5。此外,通过合成反应得到的碳化钒产物颗粒细小,呈圆球状,均匀地分布在Fe基体中;在800℃之前产物颗粒随加热温度的提高而有所长大,在800~1100℃产物颗粒尺寸几乎无变化。Using Gleeble-3500D thermal simulation equipment, the microstructure evolution of combustion synthesis of Fe-V-C system was studied by analytical experiment of the compacts of Fe-V-C mixture powders heating to 400-1100 ℃. The results show that the ignition temperature of Fe-V-C system can be decreased greatly under the action of electric field and thermal field. Firstly, when the heating temperature is below 400 ℃, although there is no reaction occurred in the system, the microstructure changes. With the temperature is in the range of 400-540 ℃, the system can be ignited with the phenomenon of "thermal explosion" appearing, the synthesis products of V and C consists of V2C. As the temperature increased continuously from 540 to 650 ℃, the synthesis products of V and C include V8C7 and V6C5 besides V2C. When the temperature increases further, in the range of 650-1100 ℃, V2C phase disappears, the synthesis products of V and C only consist of V8C7 and V6C5. In addition, the microstructure characters of products indicate that vanadium carbide product particles are spherical and very small, and they distribute in the Fe matrix uniformly. Below 800 ℃, the product particles grow up with the increasing of the heating temperature, but the size of product particles has almost no change in the range of 800-1100 ℃.
分 类 号:TG111[金属学及工艺—物理冶金]
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