A low-temperature sintered microwave dielectric ceramic material and its preparation method

Abstract

The invention belongs to the field of electronic ceramics and its manufacture, and relates to a low-temperature sintered microwave dielectric ceramic material and a preparation method thereof, which are mainly used for dielectric filters of communication systems. The material of the present invention is BaWO 4 Microwave-based dielectric ceramic material, sintering temperature 850℃~900℃, dielectric constant 5.8~9.0, loss as low as 3.70×10 ‑4 , frequency temperature coefficient ‑30~‑10ppm / ℃; its general chemical formula is BaWO 4 -xM 2 CO 3 ‑yBaO‑zB 2 o 3 ‑wSiO 2 , where M is Li + 、K + or Na + Alkali metal ions, and x, y, z, and w cannot be zero at the same time. When y=0, after sintering at 850°C to 900°C, all are BaWO 4 phase; when y is not equal to 0, the main crystal phase is BaWO 4 phase, the subcrystalline phase is BaSi 2 o 5 Mutually. During preparation, the raw materials are directly mixed according to the required chemical formula, and prepared by solid-state sintering method; the final sintering temperature is as low as 850°C, the holding time is 0.5-2h, and the dielectric performance is 5.8-9.0, which meets the high-frequency dielectric filter BaWO 4 The base LTCC microwave dielectric ceramic material can be applied in the LTCC field.

Description

Technical field [0001] The present invention is in the field of manufacturing ceramic electronic relates to a microwave dielectric ceramic material sintered at low temperature and preparation method thereof, a dielectric filter mainly used for the communication system. Background technique [0002] In the 1970s, the dielectric filter can be used in the field of microwave communications, since the 1980s, with the advent of cellular phones, a dielectric filter is also used in a mobile communication system. With the continuous expansion of mobile communication services and content, my country's mobile communication bands from the early 900MHz and 1800MHz band officially at the end of 2013 to expand 4G. Today, the development of technology ascendant 5G, the dielectric ceramic used in the microwave band needs to have a low dielectric constant ([epsilon] r <10), therefore, developed to meet the microwave dielectric ceramic 5G technology has important industrial application value. ...

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Problems solved by technology

Among them, BaWO 4 Ceramics can be sintered densely at 1100°C and the dielectric properties are: ε r =9.0, Q×f=32200GHz, but its relatively high sintering temperature and long holding time limit its application in LTCC

However, so far, BaWO 4 The research on the sintering properties of base ceramics is limited to the addition of Ba 3 (VO 4 ) 2 After that, it can be sintered and compacted at 925°C for 4 hours to obtain better performance or use BaWO 4 The medium temperature sintering characteristics to reduce the temperature of high temperature sintered ceramic materials, while BaWO 4 Systematic research on low-temperature sintering of microwave dielectric ceramics and LTCC applications have not been reported

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