摘要
用油酸对Al2O3粉末进行表面改性,研究了表面改性工艺对陶瓷致密性、抗弯强度及显微结构的影响。对改性机理进行了探讨。结果表明:改性粉末在1600℃保温2h制备的Al2O3陶瓷,相对密度达到98.9%,抗弯强度达393MPa。利用油酸与粉末表面羟基反应形成非极性有机表层结构,消除粉末间的硬团聚,降低压制过程中的内摩擦力,从而改善坯体的均匀性和致密性,提高陶瓷的抗弯强度。
The surface of Al2O3 powder was modified by oleic acid, and the effects of surface modification technology on the compactness, bending strength and mierostructure of Al2O3 ceramics were investigated. The mechanism of surface modification was also discussed. The results show that the relative density and bending strength of ceramic sintered at 1 600℃ for 2 h with modified powder reach to 98.9% and 393 MPa respectively. An nonpolar and organic surface layer structure is formed by the reaction of oleic acid with the surface hydroxyl groups of Al2O3 powder. The hard agglomerations between powders are eliminated and the internal frictional force in dry pressing is reduced. The uniformity and density of both the green body and ceramic are improved and the bending strength of ceramic is increased.
出处
《电子元件与材料》
CAS
CSCD
北大核心
2009年第6期1-3,共3页
Electronic Components And Materials
基金
南京信息工程大学科研基金资助项目
关键词
无机非金属材料
AL2O3陶瓷
表面改性
抗弯强度
干压成型
non-metallic inorganic material
Al2O3 ceramic
surface modification
bending strength
dry pressing
