Fe_2O_3-NiO-TiN体系的初期烧结动力学

Initial Sintering Kinetics of Fe_2O_3-NiO-TiN System

利用高温真空热膨胀仪,采用恒升温速率法研究了升温速率和纳米TiN添加量对NiFe_2O_4陶瓷基惰性阳极材料初期烧结行为的影响。结果表明,较低的升温速率可以促进烧结的致密化;纳米TiN可以降低Fe_2O_3-NiO体系的烧结颈温度,加快体系的致密化过程,TiN添加量为1%时,试样的线收缩率最大;TiN可以使得Fe_2O_3-NiO体系的初期烧结机制由晶界扩散转变为体积扩散,同时也可以降低体系的烧结活化能,在TiN的添加量为1%时,体系的烧结活化能从未添加时的446.3kJ/mol降低到了217.4kJ/mol。

The effect of heating rate and nano-TiN addition amount on the initial sintering behavior of NiFe2O4 ceramic-based inert anode materials was studied using a high-temperature vacuum thermal dilatometer. The results show that the lower heating rate can promote the densification of sintering. The nanoTi N can reduce the sintering neck temperature of Fe2O3-Ni O system and accelerate the densification process of the system. When the Ti N addition amount is 1%,the linear shrinkage rate of the sample is maximum. Ti N can make the initial sintering mechanism of Fe2O3-NiO system from grain boundary diffusion to volume diffusion,and can also reduce the sintering activation energy of the system. When the amount of Ti N addition is 1%,the sintering activation energy of the system is reduced from 446. 3 k J/mol to 217. 4 k J/mol.