摘要
本文采用水溶性环氧/多胺类树脂体系低成本发泡注凝技术制备了Al2O3多孔陶瓷材料，研究了Al2O3多孔陶瓷的料浆配制、发泡、固化以及烧结工艺，并对Al2O3多孔陶瓷的微观结构、弯曲强度和介电常数进行了测试分析。结果表明，当Al2O3多孔陶瓷料浆固含量为50vol.%、分散剂用量为Al2O3粉体的0.25wt.% 时料浆综合性能最好，水溶性环氧和多胺类树脂分别为料浆的6vol.%和2.4vol.%。当发泡剂用量为料浆的2～6vol.% ，固定发泡时间1 h，40 ℃下固化3 h，可获得不同气孔率的Al2O3泡沫凝胶体，脱模干燥后经1580 ℃/3 h烧结，可制备出孔隙率60.8~43.4%的Al2O3多孔陶瓷，其弯曲强度为32-55 MPa、介电常数为2.8~4.4，且均与多孔陶瓷孔隙率呈线性变化关系。
Porous alumina ceramics were fabricated by low-cost foaming and gel-casting technology with water-soluble epoxy andpolyamine resin system. The rheological properties of the slurries, the foaming, the coagulation and the sintering process were studied. Also,the microstructure, the bending strength and the dielectric constant were investigated. Results show that the complex properties of aluminaceramic slurry is best when the solid content is 50vol.% and the dispersant content is 0.25wt.% of the alumina powders. The water-solubleepoxy and the polyamine resin amount to 6vol.% and 2.4vol.% of the slurry respectively. When the foaming agent content is from 2vol.%to 6vol.% of the slurry, the foaming time is 1 hour, the coagulation time is 3 hours at 40 ℃, porous alumina ceramics gels with differentporosities could be obtained. After demoulding, drying, and sintering at 1580 ℃ for 3 hours, the porous alumina ceramics were prepared withthe porosity between 60.8-43.4%, the bending strength of 32-55 MPa, and the dielectric constant of 2.8-4.4. Both their bending strength anddielectric constant linearly vary with their porosity.
作者
焦春荣
陈大明
仝建峰
黄浩
JIAO Chunrong;CHEN Daming;TONG Jianfeng;HUANG Hao(National Key Laboratory of Advanced Composites, Beijing Institute of Aeronautical Materials, Beijing 100095, China;Aviation Industry Corporation of China Composites Center, Beijing 100095, China)
出处
《陶瓷学报》
CAS
北大核心
2016年第3期253-258,共6页
Journal of Ceramics
关键词
Al2O3多孔陶瓷
水溶性环氧
发泡注凝
porous alumina ceramics
water-soluble epoxy
foaming and gel-casting
