摘要
利用34.5GHz回旋管毫米波烧结和常规烧结分别制备了纯钛酸钡陶瓷材料,分析和比较了2种烧结方法制备的纯钛酸钡陶瓷材料的介电性能,讨论了毫米波烧结对纯钛酸钡陶瓷材料显微组织和介电性能的影响。结果表明:与常规烧结相比,毫米波烧结过程具有更高的固态扩散速率,毫米波烧结陶瓷样品中出现晶粒异常长大的烧结温度更低;毫米波烧结能够显著降低烧结温度;960℃烧结15min的毫米波烧结样品的相对密度为96.6%,而经960℃常规烧结60min的样品的相对密度仅为54.8%。900℃毫米波烧结15min的样品与1220℃常规烧结15min样品的相对密度相近(分别为88.7%和89.6%),而前者的介电常数(4224)远高于后者(3655)。
Pure barium titanate ceramics was sintered by using 34.5 GHz millimeter wave radiation and conventional sintering respectively. Dielectric properties of pure barium titanate ceramics prepared by the above methods were analyzed and compared. The effect of millimeter wave sintering on the microstructure and the dielectric properties of the ceramics is discussed. Compared with conventional sintering millimeter wave sintering causes an enhanced diffusivity, that results in the exaggerated grain growth of barium titanate at lower sintering temperature, and noticeably lower sintering temperature of the material. Relative density of the ceramics sintered by millimeter wave sintering at 960°C for 15 min is 96.6%, while only 54.8% for the ceramics sintered by conventional method at 960°C for 60 min. The dielectric constant (4224) of the millimeter wave sintering samples at 900°C for 15 min is much higher than that (3655) of the conventional sintering samples at 1220°C for 15 min, while the relative density of both samples is near, 88.7% for the former and 89.6% for the latter.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第9期1134-1139,共6页
Journal of The Chinese Ceramic Society
关键词
毫米波烧结
常规烧结
纯钛酸钡
介电性能
Ceramic materials
Dielectric properties
Grain growth
Microstructure
Millimeter waves
