【摘要】 在不同条件下采用固相反应法合成BaCu(B2O5)(BCB)粉体,研究了所合成的BCB粉体对Ba5Nb4O15-BaWO4(BNBW)陶瓷的微波介电性能的影响。结果表明,采用无水乙醇作为球磨介质,在800℃煅烧可以得到无杂相的BCB。将BCB作为助烧剂,添加少量于BNBW陶瓷中,在950℃烧结时可有效促进陶瓷致密化。随着BCB的掺量增加,BNBW陶瓷的介电常数εr和谐振频率温度系数τf单调降低,而品质因数与频率之积Q×f值先上升后下降。当w(BCB)=1%时,BNBW陶瓷得到较好微波性能:εr=19.0,Q×f=33 802GHz,τf=2.5×10-6/℃。更多还原

【Abstract】 The BaCu(B2O5)(BCB)powder was prepared by solid state reaction under different conditions.And the effect of BCB powder on the microwave dielectric properties of Ba5Nb4O15-BaWO4(BNBW)ceramics was investigated.The results showed that BCB without secondary phase could be obtained in use of anhydrous ethanol as ballmilling medium and being sintered at 800℃.Adding a small amount of BCB in BNWB ceramics as a sintering aid can promote the densification of BNBW ceramics effectively sintered at 950 ℃.With the increase of BCB content, the dielectric constant ofεrand resonant frequency-temperature coefficient ofτf decreased monotonously.Meanwhile,the value of Q×fincreased firstly and then decreased.When w(BCB)was 1%,BNBW ceramics presented good microwave dielectric properties withεr=19.0,Q×f =33 802GHz andτf=2.5×10-6/℃。更多还原