摘要
采用'气窒'法实现燃烧波的'淬熄',获得了燃烧合成Zn铁氧体粉体不同阶段的燃烧产物.采用XRD、SEM和m ssbauer谱研究燃烧产物的相组成和微观结构的变化.提出了燃烧合成Zn铁氧体的溶解-析出机制,即铁粉在氧气中燃烧,被氧化成Fe2O3.在高温下,Fe和Fe2O3部分熔化成液相.高熔点的ZnO颗粒悬浮于液相中并逐渐溶解,最后Zn铁氧体逐渐从液相中析出.此外,结合上述分析,给出了燃烧合成ZnFe2O4的反应机制模型.
The reaction mechanism of combustion synthesis of zinc ferrite which belongs to the complex oxide combustion reaction was investigated by using a combustion front quenching method. Phase transformation and microstructural evolution of the quenched samples were observed by XRD, SEM and mssbauer spectroscopy. The results showed that the combustion proceeded by a dissolution-precipitation mechanism, viz. the iron was burned to form Fe_2O_3 in an oxygen atmosphere and melting of the Fe_2O_3 led to the dissolving of the ZnO particles, then ZnFe_2O_4 precipitated out. In addition, a model of the mechanism was drawn.
出处
《材料科学与工艺》
EI
CAS
CSCD
2004年第1期41-44,共4页
Materials Science and Technology
基金
黑龙江省博士后基金资助项目
黑龙江省自然科学基金资助项目(E02-7)
哈尔滨工业大学跨学科交叉基金资助项目(HIT.MD.2003 03).
关键词
燃烧合成
ZNFE2O4
相转变
反应机制
微观结构
铁氧体
combustion synthesis
zinc ferrite
phase transformation
dissolution-precipitation reaction mechanism
