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Ultra-low dielectric constant temperature-stable type microwave dielectric ceramic Li2TiSi6O15
The invention discloses an ultra-low dielectric constant temperature-stable type microwave dielectric ceramic Li2TiSi6O15 and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and preparing Li2CO3, TiO2 and SiO2 raw powder with the purity of more than or equal to 99.9wt% according to the composition of the Li2TiSi6O15; (2) performing wet type ball milling and mixing on raw materials in the step (1) for 12 hours through a ball milling medium of distilled water, drying and preburning for 6 hours in the air atmosphere at a temperature of 990 DEG C; and (3) adding a binder into the powder obtained in the step (2), granulating, performing pressure forming, and finally sintering for 4 hours in the air atmosphere at a temperature of 1040-1090 DEG C, wherein a 5wt% polyvinyl alcohol solution is adopted as the binder, and the addition amount of the polyvinyl alcohol accounts for 3% of total mass of the powder. The prepared ceramic is well sintered at 1100 DEG C below, the dielectric constant is up to 9.1-9.6, the quality factor Qf value is up to 160000-197000 GHz, the resonance frequency temperature coefficient is small, and the ultra-low dielectric constant temperature-stable type microwave dielectric ceramic Li2TiSi6O15 has great application values industrially.
Ultra-low dielectric constant temperature-stable type microwave dielectric ceramic Li2TiSi6O15
The invention discloses an ultra-low dielectric constant temperature-stable type microwave dielectric ceramic Li2TiSi6O15 and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and preparing Li2CO3, TiO2 and SiO2 raw powder with the purity of more than or equal to 99.9wt% according to the composition of the Li2TiSi6O15; (2) performing wet type ball milling and mixing on raw materials in the step (1) for 12 hours through a ball milling medium of distilled water, drying and preburning for 6 hours in the air atmosphere at a temperature of 990 DEG C; and (3) adding a binder into the powder obtained in the step (2), granulating, performing pressure forming, and finally sintering for 4 hours in the air atmosphere at a temperature of 1040-1090 DEG C, wherein a 5wt% polyvinyl alcohol solution is adopted as the binder, and the addition amount of the polyvinyl alcohol accounts for 3% of total mass of the powder. The prepared ceramic is well sintered at 1100 DEG C below, the dielectric constant is up to 9.1-9.6, the quality factor Qf value is up to 160000-197000 GHz, the resonance frequency temperature coefficient is small, and the ultra-low dielectric constant temperature-stable type microwave dielectric ceramic Li2TiSi6O15 has great application values industrially.
Ultra-low dielectric constant temperature-stable type microwave dielectric ceramic Li2TiSi6O15
FANG LIANG (author) / WANG DAN (author) / SU HEPING (author)
2015-06-10
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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