A kind of lithium-based microwave dielectric ceramic material, its preparation method and lithium-based microwave dielectric ceramic

Abstract

The invention provides a lithium-based microwave dielectric ceramic material. The raw materials include: main powder and auxiliary powder shown in formula (I); the auxiliary powder includes glass powder and 0.5-1.5 wt% of the main powder Accounting for 5-10wt% rutile TiO in the main powder 2 Micropowder; Li 2 (Zn (1‑x) Cu x )(Ti (1‑y) (Mg 1 / 3 Nb 2 / 3 ) y ) 3 o 8 , formula (I). The specific glass powder of the present invention reduces the sintering temperature of the system and introduces Mg 2+ , Nb 5+ replace Ti 4+ Improve frequency temperature coefficient, introduce TiO 2 Can increase Li 2 CO 3 ‑ZnO‑TiO 2 The sintering density of the system can be adjusted by τ f value. Cu 2+ Substitution and specific glass frits successfully make Li 2 CO 3 ‑ZnO‑TiO 2 The system is perfectly sintered at 850-890°C and has excellent dielectric properties, so that the material can be co-fired with Ag electrodes.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a low-temperature sintered medium dielectric constant lithium-based microwave dielectric ceramic material, a preparation method thereof and a lithium-based microwave dielectric ceramic. Background technique [0002] With the continuous development of electronic information technology in the direction of high frequency and digitalization, the requirements for the integration and modularization of components and circuits are becoming more and more urgent. The electrical, mechanical, process characteristics and high reliability have become one of the hotspots in the modularization of electronic devices. With the advancement of science and technology, LTCC technology has put forward higher requirements for microwave dielectric ceramic materials: (1) excellent microwave dielectric properties, suitable dielectric constant, low loss, and near-zero resonance frequency temperature coeff...

AI Technical Summary

Problems solved by technology

The resonant frequency temperature coefficient of the material is high (-47.2~-20.7ppm / ℃), and the additive V 2 o 5 Adverse effects in the preparation of cast tape

Invention patent "Low-temperature sintering of lithium-based zinc-titanium microwave dielectric ceramics and its preparation method" CN102617127A discloses a sintering aid for sintering below 900°C as H 3 BO 3 Or ZBS (60wt%-ZnO, 30wt%-B 2 o 3 , 10wt%-SiO 2 ) of Li 2 ZnTi 3 o 8 Ceramic materials, the sintering aid added to the material deteriorates the dielectric properties of the material system

The invention patent "a low-temperature co-fired microwave dielectric ceramic material and its preparation method" CN102381874B discloses a Li 2 ZnTi 3 o 8 Ceramic materials, in which the low melting point substance is Li 2 O-ZnO-B 2 o 3 or Li 2 O-B 2 o 3 -SiO 2 Glass, the sintering holding time of this material is 4h, the silver electrode is easy to ablate if the holding time is long, and the overall Q×f of this material sintered at about 875°C is slightly low, and the overall performance of the prepared material is not good due to different additions of auxiliary components , Q×f value and τ f Can't take care of it well, for example: Li 2 ZnTi 3 o 8 Add 1wt% LBS, 5wt% TiO 2 , sintered at 875°C for 4h, ε r =26.0, Q×f=24079GHz, τ f =1.6×10 -6 ppm / ℃, mainly adding Li 2 O-B 2 o 3 -SiO 2 Glass deteriorates Li 2 ZnTi 3 o 8 The dielectric properties of the system

[0005] In summary, the development of a low-temperature sintered medium dielectric constant lithium-based microwave dielectric ceramic material and its preparation method can overcome the high sintering temperature and long holding time of existing lithium-based microwave dielectric materials, which are difficult to match with silver electrodes for co-firing As well as the adverse effects of additives on dielectric properties and other deficiencies, it is very necessary

Images