不同添加物對反應燒結法製備(Zr0.8Sn0.2)TiO4微波介電陶瓷之影響

本論文主要探討燒結促進劑B2O3、NiO、CuO、La2O3及ZnO的添加對(Zr0.8Sn0.2)TiO4 (ZST)陶瓷特性之影響。本研究以反應燒結法( reaction-sintering process )來進行，即所有氧化物原料一次混合，不經煆燒而直接壓模成型，進行燒結。添加B2O3與NiO之ZST，無法得到緻密陶瓷體。添加CuO後，在1130oC/4 h燒結時，密度可達理論值( T.D. )的97%以上，由於液相的影響，會使得ZST陶瓷的燒結溫度明顯下降100 ~ 200oC。以CuO為燒結促進劑可於1150oC/2 h之燒結條件下獲得Qxf值為38,000( 7.57GHz )，εr=24，τf=2.5ppm/oC，在1170oC/2 h條件下燒結所得之Qxf=29,000，εr=37，τf=3.7ppm/oC。ZST添加La2O3可於1380oC/2 h之條件達完全燒結，以1400oC/6 h之條件燒結可得最佳之Qxf值為46,000( 7.8GHz )，εr=26.8，τf=-2.3ppm/oC。以ZnO作為燒結促進劑，可於1380oC/6 h燒結獲得Qxf=20,000( 7GHz )，εr=30.3，τf=0 ppm/oC。

關鍵字

反應燒結法；微波介電陶瓷；鈦酸鋯錫

並列摘要

(Zr0.8Sn0.2)TiO4 ( ZST ) microwave ceramics with B2O3, NiO, CuO, La2O3 and ZnO addition and prepared by a reaction-sintering process were investigated. The mixture of raw materials was pressed and sintered into ceramics without any calcination stage involved. Dense ZST ceramics could not be produced with B2O3 and NiO addition. With CuO addition, pellets of >97% theoretic density were obtained at 1130oC/4 h sintering. Microwave properties Qxf=38,000 GHz, εr=24 and τf=2.5ppm/oC were found in ZST with CuO added. In La2O3 doped ZST, Qxf=46,000 GHz, εr=26.8 and τf=-2.3ppm/oC was observed at 1450oC/6 h sintering. ZST of Qxf=20,000 GHz, εr=30.3 and τf=0ppm/oC was obtained with ZnO added and sintered at 1380oC/6 h.

並列關鍵字

Reaction-Sintering process ； microwave dielectric

參考文獻

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不同添加物對反應燒結法製備(Zr0.8Sn0.2)TiO4微波介電陶瓷之影響

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