CaO-Al_(2)O_(3)-V_(2)O_(5)渣系1600℃相平衡关系研究

CaO-Al_(2)O_(3)-V_(2)O_(5)渣系是钢液脱氮渣系的基础氧化物渣系,其相平衡关系等热力学信息对于相关渣系的研究和开发至关重要。通过高温相平衡试验,结合扫描电镜和能谱分析,研究了CaO-Al_(2)O_(3)-V_(2)O_(5)渣系的相平衡关系。根据试验结果,确定了CaO-Al_(2)O_(3)-V_(2)O_(5)渣系1600℃空气气氛条件下的相平衡关系,并绘制该体系全成分范围内CaO-Al_(2)O_(3)-V_(2)O_(5)渣系的等温截面图,共包含7个平衡相区,分别是:Liquid+Al_(2)O_(3)+CaAl_(12)O_(19)、Liquid+CaAl_(12)O_(19)+CaAl_(4)O_(7)、Liquid+CaO、Liquid+Al_(2)O_(3)、Liquid+CaAl_(12)O_(19)、Liquid+CaAl_(4)O_(7)和单一液相区。上述平衡相区的确定可实现CaO-Al_(2)O_(3)-V_(2)O_(5)渣系相图独立子体系的划分,还可为该渣系后续高温相图的绘制提供支持。

CaO-Al_(2)O_(3)-Ce_(2)O_(3)渣系的相平衡关系研究

CaO-Al_(2)O_(3)-Ce_(2)O_(3)渣系是稀土钢新型冶金渣系的基础渣系,其相平衡关系等热力学信息的缺失限制了相关渣系的研究和开发。本文通过高温相平衡实验,结合X射线衍射分析、扫描电镜及能谱分析,研究了CaO-Al_(2)O_(3)-Ce_(2)O_(3)渣系的相平衡关系。根据1100℃的实验结果,明确了该渣系中十种物相间的共存关系,以Alkemade连线的形式展示,包括:2CaO·Al_(2)O_(3)·Ce_(2)O_(3)-CaO、2CaO·Al_(2)O_(3)·Ce_(2)O_(3)-Ce_(2)O_(3)、2CaO·Al_(2)O_(3)·Ce_(2)O_(3)-3CaO·Al_(2)O_(3)、2CaO·Al_(2)O_(3)·Ce_(2)O_(3)-Ce_(2)O_(3)·Al_(2)O_(3)、2CaO·Al_(2)O_(3)·Ce_(2)O_(3)-2CaO·Al_(2)O_(3)·Ce_(2)O_(3)、2CaO·3Al_(2)O_(3)·Ce_(2)O_(3)-Ce_(2)O_(3)·Al_(2)O_(3)、2CaO·3Al_(2)O_(3)·Ce_(2)O_(3)-3CaO·Al_(2)O_(3)、2CaO·3Al_(2)O_(3)·Ce_(2)O_(3)-CaO·Al_(2)O_(3)、2CaO·3Al_(2)O_(3)·Ce_(2)O_(3)-CaO·2Al_(2)O_(3)、Ce_(2)O_(3)·Al_(2)O_(3)-CaO·2Al_(2)O_(3)、Ce_(2)O_(3)·Al_(2)O_(3)-CaO·6Al_(2)O_(3)。根据1600℃的实验结果,绘制了1600℃的等温截面图,确定了其中的4个三相区、5个两相区、单一液相区,包括:液相+CaO+2CaO·Al_(2)O_(3)·Ce_(2)O_(3)、液相+Al_(2)O_(3)·Ce_(2)O_(3)+2CaO·Al_(2)O_(3)·Ce_(2)O_(3)、液相+Al_(2)O_(3)·Ce_(2)O_(3)+2CaO·3Al_(2)O_(3)·Ce_(2)O_(3)、液相+2CaO·3Al_(2)O_(3)·Ce_(2)O_(3)+CaO·2Al_(2)O_(3)、液相+CaO、液相+2CaO·Al_(2)O_(3)·Ce_(2)O_(3)、液相+Al_(2)O_(3)·Ce_(2)O_(3)、液相+2CaO·3Al_(2)O_(3)·Ce_(2)O_(3)、Liquid+CaO·2Al_(2)O_(3)、液相区。