摘要
以CaO-B_2O_3-SiO_2(CBS)系微波介质陶瓷为基体材料,采用ZnO和Na_2O作为烧结助剂,研究了其微观结构、相组成及介电特性。研究结果表明:ZnO在烧结过程中与B_2O_3及SiO_2生成低熔点玻璃相,促进以片状集合体形式存在的CaSiO_3晶相合成,显著降低了材料的致密化温度;Na_2O虽可促进烧结,但会破坏硅灰石晶体结构,导致微波介电性能显著降低:2％(摩尔分数)ZnO取代CaO,在1000℃保温2h,具有较好的微波个电性能:ε_4为5.4。Q·f为22000GHz测试频率f_0为8.5GHz)。
CaO-B_2O_3-SiO_2(CBS) microwave dielectric ceramics using ZnO and Na_2O as additives were inves-
tigated. The microstructures, phase composition and dielectric properties of the ceramics were strdied. Low melting point
glass can be formed by ZnO, B_2O_3 and SiO_2 during the sintering process. This glass promotes the composition of CaSiO_3
which exist as flaky aggregate. Though Na_2O can also promote the composition of CaSiO_3, it destroys the crystal structure of
the CaSiO_3 and lead to poor microwave properties. Whith 2mol% ZnO replacing CaO, the ceramic has excellent microwave
dielectric properties of which, ε_r, is 5.4, Q·fis 22000GHz(is 8.5 GHz) at 1000℃ soaked for 2 hours.
出处
《硅酸盐通报》
CAS
CSCD
2004年第5期116-118,121,共4页
Bulletin of the Chinese Ceramic Society
基金
浙江省重大科技攻关项目(021101562)
