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Stable-temperature magnesium-titanate-base microwave dielectric ceramic and preparation method thereof
The invention discloses a stable-temperature magnesium-titanate-base microwave dielectric ceramic and a preparation method thereof. The expression formula is 0.89MgTiO3-0.11(Ca0.4Na0.3Sm0.3)TiO3. The preparation method comprises the following steps: proportioning MgO and TiO2 according to the stoichiometric formula MgTiO3, carrying out ball milling, drying, screening, and presintering at 800-1000 DEG C; proportioning TiO2, CaCO3, Sm2O3 and Na2CO3 according to the stoichiometric formula (Ca0.4Na0.3Sm0.3)TiO3, carrying out ball milling, drying, screening and presintering at 1000-1300 DEG C; mixing the two presintered powders in a mole ratio of 89:11, carrying out ball milling, drying, screening, granulating and pressing to obtain a green compact; and sintering the green compact at 1200-1300 DEG C to prepare the magnesium-titanate-base stable-temperature microwave dielectric ceramic. The Qf value reaches 55000-72000GHz, and the temperature coefficient of resonance frequency (tau) reaches -7.6 to -2.3*10<-6>/DEG C. The ceramic system has the advantages of simple preparation technique and excellent microwave dielectric properties, saves the energy cost, conforms to the concepts of low carbon and environment friendliness, and has wide application prospects.
Stable-temperature magnesium-titanate-base microwave dielectric ceramic and preparation method thereof
The invention discloses a stable-temperature magnesium-titanate-base microwave dielectric ceramic and a preparation method thereof. The expression formula is 0.89MgTiO3-0.11(Ca0.4Na0.3Sm0.3)TiO3. The preparation method comprises the following steps: proportioning MgO and TiO2 according to the stoichiometric formula MgTiO3, carrying out ball milling, drying, screening, and presintering at 800-1000 DEG C; proportioning TiO2, CaCO3, Sm2O3 and Na2CO3 according to the stoichiometric formula (Ca0.4Na0.3Sm0.3)TiO3, carrying out ball milling, drying, screening and presintering at 1000-1300 DEG C; mixing the two presintered powders in a mole ratio of 89:11, carrying out ball milling, drying, screening, granulating and pressing to obtain a green compact; and sintering the green compact at 1200-1300 DEG C to prepare the magnesium-titanate-base stable-temperature microwave dielectric ceramic. The Qf value reaches 55000-72000GHz, and the temperature coefficient of resonance frequency (tau) reaches -7.6 to -2.3*10<-6>/DEG C. The ceramic system has the advantages of simple preparation technique and excellent microwave dielectric properties, saves the energy cost, conforms to the concepts of low carbon and environment friendliness, and has wide application prospects.
Stable-temperature magnesium-titanate-base microwave dielectric ceramic and preparation method thereof
LI LINGXIA (author) / LI SAI (author) / LYU XIAOSONG (author) / SUN HAO (author) / YE JING (author)
2015-09-30
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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