采用高能球磨法在800℃保温2h预烧合成MgNb₂O₆粉体,研究了MgNb₂O₆陶瓷的相结构、显微结构和微波介电性能随烧结温度的变化关系。实验结果表明,高能球磨法有效促进MgNb₂O₆粉体的低温合成,降低MgNb₂O₆陶瓷的烧结温度。1220℃保温2h烧结MgNb₂O₆陶瓷,密度为4.80g/cm³,平均粒径为3.5μm,介电常数ε_r为19.7,品质因数(Q·f)为29444GHz的优良微波介电性能,MgNb₂O₆粉体有望成为新一代中温烧结高频微波介质基板材料。

By using high-energy ball-milling method, MgNb₂O₆ powders were synthesized at 800℃ for 2h. Meanwhile, phase transition, sintering behavior, microstructures, and microwave dielectric properties of MgNb₂O₆ ceramics changing with sintering tempreature were investigated. It is found that the calcining temperature of MgNb₂O₆ powders and the sintering temperature of MgNb₂O₆ ceramic are able to be effectively reduced. The pottery of MgNb₂O₆ sintered at 1,220℃ for 2h possesses the average grain size of 3.5μm, ρ= 4.80g/cm³, and excellent microwave dielectric properties of r=19.7 and quality factor Q·f=29,444GHz. Therefore, MgNb₂O₆ pottery obtained by the high energy ball-milling method makes itself become an appropriate candidate for the new generation of middle-temperature sintered high frequency microwave dielectric material.