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(Ca0.937 5Sr0.062 5)0.25(Li0.5Sm0.5)0.75TiO3微波介质陶瓷的低温烧结

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Abstract:

研究以氧化锂-氧化硼-二氧化硅-氧化钙-氧化铝(Li2O-B2O3-SiO2-CaO-Al2O3,LBSCA)低熔点玻璃料为烧结助剂降低钙和锶复合掺杂钛酸锂钐[(Ca0.9375Sr0.0625)0.25(Li0.5Sm0.5)0.75TiO3,CSLST]微波介质陶瓷的烧成温度,探讨不同LBSCA掺量对CSLST陶瓷烧结行为和微波介电性能的影响规律。结果表明当LBSCA的添加质量分数(下同)从0%到15%变化时,陶瓷的最佳烧成温度从1200℃降低到900℃。LBSCA掺量为5%的陶瓷最佳烧成温度为1000℃,此时陶瓷具有优异的微波介电性能相对介电常数εr=84.74,品质因素与频率乘积Q×f=2446GHz,频率温度系数τf=-12.48×10-6/℃。LBSCA是理想的低温烧结CSLST陶瓷的烧结助剂。

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