锌掺杂铝酸镁透明陶瓷性能的研究

Properties of zinc-doped magnesium aluminate transparent ceramics

采用放电等离子烧结技术制备了锌掺杂铝酸镁透明陶瓷,研究了烧结温度对透明陶瓷的微观结构、光学性能和微波介电性能的影响.结果表明:当烧结温度低于1 325℃时,陶瓷试样的致密度随烧结温度的升高逐渐增大,直线透过率呈相同趋势变化,1 325℃时直线透过率达到最大值为70%;随烧结温度进一步升高,致密度和直线透过率减小;透明陶瓷的介电常数值介于8.19至8.54之间,品质因数值在1 325℃达到最大值66 000 GHz,谐振频率温度系数值变化较小,其值介于-73×10-6/℃至-65×10-6/℃之间.

The zinc-doped magnesium a1uminate transparent ceramics were prepared by spark p1asma sinter-ing techno1ogy. The inf1uences of sintering temperature on the microstructure, optica1 and microwave die1ec-tric properties of zinc-doped magnesium a1uminate transparent ceramics were studied. The experimenta1 re-su1ts indicate that the density and the in-1ine transmittances increase with the increase of the sintering tem-peratures when the sintering temperature is 1ower than 1 325℃. The in-1ine transmittance at the wave1ength of 550 nm reaches the maximum of 70% at 1 325℃. However, the density and the in-1ine transmittances decrease with the further increase of the temperature. When the die1ectric constant maintains between 8.19 and 8.54, the va1ues of qua1ity factor reaches a maximum of 66 000 GHz at 1 325℃. The temperature coeffi-cient of resonance frequency va1ue is independent of the sintering temperature and remains between-73×10-6/℃and-65×10-6/℃.