Performance of High Thermal Conductivity Dense Silica Bricks and Their High Thermal Conductivity Mechanism

• 作者: SUN Yang ZHANG Xiuhua HU Hao LIU Xiang LIU Ying CHEN Bo
• 来源期刊: 中国耐火材料（英文版）
• 年，卷（期）: 2022,（1）
• 页码范围: 30-34
• 页数: 5页
• 语种: 英文
• DOI: 10.19691/j.cnki.1004-4493.2022.01.005

摘要

High thermal conductivity dense silica bricks have the higher thermal conductivity than ordinary silica bricks,which is conducive to the realization of energy saving and emission reduction in the iron and steel industry.The performance of ordinary silica bricks and high thermal conductivity dense silica bricks was compared,and the high thermal conductivity mechanism was analyzed.The results show that(1)compared with ordinary silica bricks,high thermal conductivity dense silica bricks have the characteristics of higher thermal conductivity,lower apparent porosity,higher tridymite content,higher compressive strength,and higher thermal expansion;(2)by increasing the tridymite content and reducing the porosity,the close packing of honeycomb α-tridymite improves the density and continuity of the SiO2 frame structure of the silica bricks,and the larger area perpendicular to the heat transfer direction improves the thermal conductivity of the bricks;(3)the densification of the silica bricks also increases the thermal expansion of the bricks,but they still meet the standard requirements.