摘要
采用不同浓度的六偏磷酸钠溶液和磷酸盐缓冲液对文石碳酸钙进行表面改性。通过衰减全反射-傅里叶变换红外光谱(ATR-FTIR)、扫描电镜、差热分析等手段研究了处理溶液浓度对常压下文石高温相变过程的影响。结果表明,吸附在纳米碳酸钙表面的磷酸盐可有效提升文石-方解石的相变温度和热稳定性。随着磷酸盐缓冲液浓度的提升,文石相变温度由470℃上升至490℃。相比之下,低浓度的六偏磷酸钠溶液可显著提升文石的热稳定性,但文石的相变温度会随着六偏磷酸钠溶液浓度的升高而降低。
The surface treatment on the aragonite was carried out as using sodium hexametaphosphate or orthophosphates with varying concentrations.The impact of treatment fluid concentrations on the high⁃temperature phase transformation of aragonite under normal pressure was investigated using ATR⁃FTIR,scanning electron microscopy,and differential thermal analysis.The results demonstrate that phosphate incorporation into nano⁃calcium carbonate enhances the phase⁃transition temperature between aragonite and calcite as well as the thermal stability of aragonite.An increase in orthophosphate concentration raises the phase⁃transition temperature of aragonite from 470℃to 490℃.In contrast,low⁃concentration sodium hexametaphosphate could obviously improve thermal stability of aragonite,which would be worse with higher concentration of sodium hexametaphosphate.
作者
李润丰
王帅
韩康
刘爽
占华生
许海峰
郑永超
刘磊
高博洋
LI Runfeng;WANG Shuai;HAN Kang;LIU Shuang;ZHAN Huasheng;XU Haifeng;ZHENG Yongchao;LIU Lei;GAO Boyang(State Key Laboratory of Solid Waste Reuse for Building Materials,Beijing Building Materials Academy of Science Research,Beijing 100041,China;Beijing Jinyu Tongda Refractory Technology Co.,Ltd.,Beijing 100043,China;BBMG Commercial and Trading Co.,Ltd.,Beijing 100089,China;China Quality Certification Centre,Beijing 100070,China)
出处
《材料导报》
CSCD
北大核心
2023年第S02期164-168,共5页
Materials Reports
