【摘要】 以CaO-B₂O₃-SiO₂（CBS）系微波介质陶瓷为基体材料,采用ZnO和Na₂O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B₂O₃及SiO₂生成低熔点玻璃相,促进以片状集合体形式存在的CaSiO₃晶相合成,显著降低了材料的致密化温度;Na₂O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:ε₄为5.4。Q·f为22000GHz测试频率f₀为8.5GHz)。更多还原

【Abstract】 CaO-B₂O₃-SiO₂（CBS） microwave dielectric ceramics using ZnO and Na₂O as additives were inves-tigated. The microstructures, phase composition and dielectric properties of the ceramics were strdied. Low melting pointglass can be formed by ZnO, B₂O₃ and SiO₂ during the sintering process. This glass promotes the composition of CaSiO₃which exist as flaky aggregate. Though Na₂O can also promote the composition of CaSiO₃, it destroys the crystal structure ofthe CaSiO₃ and lead to poor microwave properties. Whith 2mol% ZnO replacing CaO, the ceramic has excellent microwavedielectric properties of which, ε_r, is 5.4, Q·fis 22000GHz（is 8.5 GHz） at 1000℃ soaked for 2 hours.更多还原