Author(s): WANG Wenzuo, LI Xiaoyun, QIU Tai
Pages: 145-149
Year: 2011 Issue:  5
Journal: Acta Materiae Compositae Sinica
Keyword:  Al2O3; hot-pressed; microstructure; bending strength; dielectric properties; gas tightness;
Abstract: 以高纯的α-Al2O3为原料,以MgO、La2O3为烧结助剂,采用热压烧结工艺制备Al2O3。用阿基米德法、SEM、XRD等研究了材料的烧结性能、显微结构和相组成;用三点弯曲法测试材料的力学性能,用阻抗仪和氦质谱检漏仪分别测试试样的介电性能和气密性。结果表明：在1500℃烧结制备的材料晶粒细小,平均晶粒尺寸小于1μm,样品的抗弯强度达到600 MPa以上;La2O3加入量为2%时,介电损耗为4.0...