Low Temperature Sintering and Microwave Dielectric Properties of MnO2-CuO-TiO2 Co-Doped Al2O3 Ceramics

Abstract

Abstract: Al₂O₃ ceramics is an important microwave dielectric material with excellent dielectric properties and is widely used in microwave circuits. However, its high sintering temperature leads to high energy consumption. Lowering the sintering temperature at a low cost is of great significance for the further development of Al₂O₃ ceramics. Low temperature sintering of Al₂O₃ ceramics was achieved by doping MnO₂-CuO-TiO₂, and its sintering behavior and microwave dielectric properties were studied. The results show that doping 0.7% (mass fraction) MnO₂, 0.5% (mass fraction) CuO and 0.8% (mass fraction) TiO₂ can greatly reduce the sintering temperature of Al₂O₃ ceramics, and the obtained ceramics have good microwave dielectric properties. When the sintering temperature is 1 250 ℃, the density of Al₂O₃ ceramics can reach 3.92 g/cm³, the dielectric constant ε_r is 10.02,and the quality factor Q×f resonant frequency value is 51 239 GHz. The lattice distorting activation of Al₂O₃ caused by the solid solution of Ti⁴⁺, Mn⁴⁺, Cu²⁺ and the formation of the low eutectic may be the reasons for promoting the low-temperature sintering of Al₂O₃ ceramics.

Key words: Al₂O₃ ceramics, MnO₂-CuO-TiO₂, low temperature sintering, microwave dielectric property, doping

CLC Number:

TQ174

LIN Congyi, TAO Honglei, LI Wei. Low Temperature Sintering and Microwave Dielectric Properties of MnO₂-CuO-TiO₂ Co-Doped Al₂O₃ Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3764-3768.

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Low Temperature Sintering and Microwave Dielectric Properties of MnO₂-CuO-TiO₂ Co-Doped Al₂O₃ Ceramics

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