BaV2O6와 BaWO4을 이용한 초저온 동시소성 세라믹 제조
Fabrication of a Novel Ultra Low Temperature Co-fired Ceramic (ULTCC) Using BaV2O6 and BaWO4
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(1-x)BaWO4-xBaV2O6(x=0.54~0.85) 조성의 새로운 초저온 동시 소성 세라믹(ULTCC)용 마이크로파 유전체복합 재료를 BaWO4와 BaV2O6의 혼합물을 소성하여 제조되었다. 수축 시험은 세라믹 복합재가 BaV2O6의 영향으로 500 oC의 낮은 온도에서 치밀화가 시작되며, 650oC에서 상대밀도 98%로 소결될 수 있음을 보였다. X-선 회절 분석은 복합체는 BaWO4와 BaV2O6이 공존하고 소결체에서 2차상이 검출되지 않음을 보였다. 이는 두 상이 서로 우수한 화학적 안정성이 있음을 의미하였다. 거의 0에 가까운 공진 주파수 온도계수(τf)는 복합체에 존재하는 두 상의 τf 값이 각각 양(+) 및음(-)의 값임에 따라 두 상의 상대적 함량을 조절하여 얻을 수 있었다. BaV2O6의 함량이 x=0.53에서 0.85로 증가함에 따라 복합 재료의 τf 값은 7.54에서 14.49 ppm/oC로 증가하였고 εr은 10.08에서 11.17로 증가했으며 Qxf값은 47,661에서37,131 GHz로 감소하였다. 최고의 마이크로파 유전 특성은 BaV2O6의 함량이 x=0.6 일 때, εr=10.4, Q×f=44,090 GHz 및τf=-2.38 ppm/oC값을 얻을 수 있었다. 화학적 호환성 실험은 개발된 복합 재료가 동시 소성 과정에서 알루미늄 전극과 반응성이 없음을 보여주었다.
Abstract
A novel microwave dielectric composite material for ultra-low temperature co-fired ceramics (ULTCC) with (1-x)BaWO4-xBaV2O6 (x=0.54~0.85) composition was prepared by firing a mixture of BaWO4 and BaV2O6. Shrinkage tests showed that the ceramic composite begins to densify at a temperature as low as 550°C and can be sintered at 650 °C with 98% of relative density under the influence of BaV2O6. X-ray diffraction analysis showed that BaWO4 and BaV2O6 coexisted and no secondary phase was detected in the sintered bodies, implying good chemical compatibility between the two phases. Near-zero temperature coefficients of the resonant frequency (τf) could be achieved by controlling the relative content of the two phases, due to their positive and negative τf values, respectively. With increasing BaV2O6 (x from 0.53 to 0.85), the τf value of the composites increased from -7.54 to 14.49 ppm/oC, εr increased from 10.08 to 11.17 and the quality factor (Q×f value) decreased from 47,661 to 37,131 GHz. The best microwave dielectric properties were obtained for x=0.6 samples with εr=10.4, Q×f=44,090 GHz, and τf=-2.38 ppm/oC. Chemical compatibility experiments showed the developed composites are compatible with aluminum electrode during co-firing process.
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