铁粉含量对自蔓延高温合成Ni-Zn铁氧体粉体的影响

Effect of iron content on self-propagating high temperature synthesis of Ni-Zn ferrite powders

在理论计算铁粉含量与绝热温度关系的基础上 ,考察了以自蔓延高温合成方法 (SHS)制备Ni -Zn铁氧体粉体过程中 ,铁粉含量对燃烧温度、燃烧波传播速度以及产物微观结构的影响 ,确定了以SHS合成Ni-Zn铁氧体粉体所需的最佳铁粉含量值 .结果表明 :铁粉含量越高 ,燃烧温度愈高 ,燃烧波传播速度愈快 ,产物转化得越完全 ,但燃烧温度过高会使产物中出现大量液相 ,产物已不能用于成型和烧结 .当铁粉含量在k=0 .5时 。

Based on calculating the relationship between the iron content and the adiabatic combustion temperature in self propagating high temperature synthesis(SHS) of Ni-Zn ferrite powders, the effect of iron content on combustion temperature ,combustion wave velocity and the microstructure of the products was investigated and an optimal iron content for the SHS process was obtained. The results show that an increase in the iron content results in an increase of combustion temperature and combustion wave velocity. And the higher the iron content, the higher the ferritization degree of the products is. However, when k value is above 0.9, a large quantity of liquid phase can be observed in the products, and such combustion products can not be used for molding and sintering. Thus, the optimal k value was chosen as 0.5 for the SHS process.