Middle-low temperature sintering middle-dielectric constant microwave medium ceramics and preparation method thereof

Abstract

The invention discloses medium dielectric constant microwave medium ceramics sintered by medium-low temperature, and a preparation method thereof. When in preparation, ZnO and Nb2O5 are mixed and added with grinding aid for ball milling; after being dried, the mixture is presintered at the temperature of 900 to 1000 DEG C for 2 to 8 hours; then the presintered powder lot is dried after being ball-milled with TiO2, a sintering auxiliary agent, and the grinding aid; afterwards, an adhesion agent is added, granulation and pressing molding are carried out, and sintering is carried out for 2 to 8 hours within the range of 900 to 1000 DEG C, thus obtaining the microwave medium ceramics. The microwave medium ceramic material provided by the invention has good microwave dielectric property: the dielectric constant is 35 to 50, Q multiplied by f equals to 10000 to 30000GHz, temperature coefficient of resonance frequency is small and adjustable and insulating resistivity is high, therefore, the material can be used for preparing resonators, filters, phase shifters and the like, and can also be used as the dielectric material of multilayer chip ceramic capacitors, thus having important industrial application value.

Description

technical field [0001] The invention belongs to the field of microwave dielectric material manufacturing, and in particular relates to a medium-permittivity microwave dielectric ceramic suitable for preparing resonators and capacitors for medium-low temperature sintering and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics is a new trend in international research on dielectric materials in recent years, which is mainly to meet the development needs of microwave mobile communications. In the late 20th century, the combination of information processing technology and electronic information digitization technology pushed the communication system to an unprecedented new peak. The ultimate goal of communication is to achieve full-time information transmission and exchange, so that the high mobility of communication machines has become an inevitable trend of development. At present, mobile communication has been promoted to the whole peopl...

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Problems solved by technology

Zhang Qilong et al. ("Low temperature sintered ZnNb 2 o 6 / TiO 2 Preparation of composite ceramics and research on dielectric properties", Journal of Materials Science and Engineering 2003, 21(5): 694~696) studied ZnO:Nb 2 o 5 : TiO 2 =1:1:x system, using binary oxide V with lower eutectic point (630°C) 2 o 5 -CuO is used as a sintering aid, and it is found that when x=1.92, the dielectric properties of the microwave material obtained by sintering at 930°C are: ε r =37.71,τ f =-2ppm / ℃, but its Q×f value is low (Q×f=10370GHz), and V 2 o 5 Expensive and highly toxic, does not meet environmental protection requirements

Subsequently, Wang Huanping ("SnO 2 doped ZnO-Nb 2 o 5 -TiO 2 Microwave Dielectric Ceramics", Electronic Components and Materials, 2004, 23(7): 4~6), when the molar ratio of the material components is ZnO:Nb 2 o 5 : TiO 2 : SnO 2 =1:1:1.92:0.08, the dielectric properties of the microwave material obtained by sintering at 1150°C are: ε r =50.3, Q×f=14892GHz, but τ f too large (τ f =25.12ppm / ℃), and the sintering temperature is too high