摘要
对叶蜡石经不同温度加热处理产物的物相特征进行了较系统的X射线粉晶衍射分析,发现叶蜡石的加热相变过程具有明显的阶段性.根据主要物相及其变化和组合特征,从室温到熔点(1710℃左右)一般可划分为7个演化阶段,即叶蜡石阶段(室温—500℃),叶蜡石Ⅰ脱水阶段(500—800℃),叶蜡石Ⅱ脱水阶段(800—960℃),偏叶蜡石阶段(960—1150℃),不定形SiO2与莫来石初晶形成阶段(1150—1300℃),方石英与莫来石并存阶段(1300—1590℃),莫来石阶段(1590—1710℃).
Based on the X -ray power diffraction analysis for the characteristics of heating phase transformation of pyrophyllite, it is discovered that the phase transformation of pyrophyllite carries out stage by stage during heating . According to the major phases and their assemblage, seven stages can be devided between indoor temperature to melting point (about 1710℃),i. e., the pyrophyllite stage (room temperature—500 ℃), pyrophyllite I dehydration stage (500—800 ℃),pyrophyllite Ⅱ dehydration stage (800—960 ℃),pyrophyllite anhydride stage (960? ? 150 ℃ ),amorphous SiO 2 and mullite crystallite forming stage (1 150—1 300 ℃),coexistence stage of cristobalite and mullite (1 300—1 590 ℃), and mullite stage (1 590—1 710 ℃).
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1998年第5期618-623,共6页
Journal of The Chinese Ceramic Society
基金
湖南省自然科学基金
湖南省科研计划
"八五"重点攻关项目
湖南省中青年专家基金
关键词
叶蜡石
相变
X射线
衍射分析
加热
pyrophyllite, phase transformation, pyrophyllite anhydride, mullite, cristobalite, XRD analysis