摘要
以Si3N4为基体、BN为添加剂,采用添加PMMA造孔剂法制备出具有优良力学性能和介电性能的多孔BN/Si3N4复合陶瓷。通过对材料的物相组成、显微结构、气孔率、孔径分布、力学及介电性能的表征和测试,系统分析了造孔剂含量对材料结构和性能的影响。结果表明:随着造孔剂含量的增加,多孔BN/Si3N4复合陶瓷的气孔率增大,抗弯强度减小,介电常数减小,而介电损耗呈微弱的上升趋势。当造孔剂粒径为2μm,含量为5%(质量分数,下同)时,制备出气孔率达到40.8%,抗弯强度达到(114.67±10.73)MPa,介电常数为4.0,介电损耗为3.3×10-3的高性能多孔BN/Si3N4复合陶瓷透波材料。
The application of zirconia spheres as column packing material for high performance liquid chromatography (HPLC) has been paid more and more attention, for its excellent thermal, chemical and mechanical stabilities as well as bioanalysis suitability. An ideal column packing material for HPLC should have suitable average particle size, narrow particle size distribution, high specific surface area, and relative high porosity with mesoporous in particles. Fabricating ZrO2 microspheres with the properties mentioned above is the greatest challenge for Zr-based column packing material. Yet solutions remain elusive. In this paper, ZrO2 microspheres were synthesized from ZrOCl2 by an oil emulsion method, and H2O2 was introduced into the oil emulsion system. The morphologies, particle size distribution, phase, specific surface area, pore volume and pore diameter of zirconia microspheres were characterized by SEM, Malvern particle sizeanalyzer, TG-DSC analyzer, XRD, and Gas adsorption instrument. The result shows that H2O2 can improve the hydrolysis and gelation of zirconium ion, and affect the reactions and phase transformations taking place during heat treatment. As a result it increases the productive rate, specific surface area and pore volume of ZrO2 microspheres. This discovery shows a hopeful way to adjust the properties of ZrO2 microspheres and further makes it a suitable column packing material for HPLC.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第S1期193-196,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(90916025
51172119)
纤维材料改性国家重点实验室(东华大学)开放课题
关键词
高效液相色谱填料
氧化锆微球
油乳液法
PLC packing material
zirconia microsphere
oil emulsion method
H2O2
