硫辅助合成高孔隙率大孔氮化硼材料

摘要

Three-dimensional (3D) macroporous boron nitride materials with a certain order of pore arrangements have been synthesized in the existence of sulfur powders.The as-obtained materials exhibit open macropores with high specific surface area of 230 m2 · g-1 and high porosity of 85.6％.Without addition of sulfur disordered 3D macroporous boron nitride was formed only and its specific surface area and porosity were decreased to 122 m2·g-1 and 73.7％,respectively.Both of the products obtained with and without addition of sulfur show good oxidation resistance below 800 ℃.The formation process and the role of sulfur powders were studied.%采用硫粉辅助的方法合成了具有一定有序孔洞结构的三维大孔氮化硼材料,具有高比表面积(230 m2· g-1)和高孔隙率(85.6％),并呈现开孔结构.在未加入硫粉的情况下则只形成完全无序的三维大孔氮化硼,并且比表面积和孔隙率分别降至122m2·g-1和73.7％.热重测试表明两种产品均具有良好的抗氧化性能.本文还对这种大孔材料的形成过程和硫粉的作用进行了初步的探讨.