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Modification and Co-firing with Copper Electrode of BiNbO4 and ZnTiO3 Microwave Dielectric Ceramic

Author: HuangYaMeng
Tutor: WangJiaBang
School: Zhejiang University
Course: Materials Science and Engineering
Keywords: LTCC Microwave ceramics Dielectric properties BiNbO4 ZnTiO3 Sintering atmosphere
CLC: TQ174.1
Type: Master's thesis
Year: 2011
Downloads: 53
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Abstract


Microwave dielectric ceramic components miniaturization and portability, the rapid development of mobile communication put forward higher requirements, low-temperature co-fired ceramic (low-temperature co-firing ceramics, LTCC) technology appear to provide a way out. To meet the requirements of LTCC technology, microwave dielectric ceramics development; toward the low-temperature sintering, the high-frequency direction in order to further reduce costs, the electrode material by Pt, Pd, Au, Ag and other precious metals to Cu (1064 ° C), but the copper electrode Ease oxidation, to be co-fired ceramic matrix to achieve protective atmosphere. BiNbO4 ceramic is a class of low-temperature co-fired ceramic microwave dielectric properties so that it can be used in the manufacture of components of various layers; the ZnTiO3 ceramic has excellent microwave dielectric properties, not to join the sintering aids can be sintered at 1100 ℃. In this paper, in order to BiNbO4 ceramics and ZnTiO3 of ceramics for the study, prepared by solid state reaction Ceramic System CuO, MnO2 sintering aids and sintering atmosphere on the microwave dielectric ceramic composition, microstructure, sintering and dielectric properties of and the effects of co-firing of two modified microwave ceramics with copper electrodes. BiNbO4 ceramic itself is difficult to sinter dense, and easier decomposition under conditions of low oxygen partial pressure. This study by lowering the sintering temperature; by MnO2 Mn in the substituted Nb generate oxygen vacancy to decrease due to the characteristics of the atmosphere of oxygen vacancy, add MnO2 in a nitrogen atmosphere to reduce the BiNbO4 ceramic exploded in the BiNbO4 ceramic system CuO. Studies show: adding of CuO can reduce the sintering temperature to 920 ° C, the ideal microwave dielectric properties can be obtained under a nitrogen atmosphere: εr = 43.65, Q × f = 3463GHz; under the low oxygen partial pressure, BiNbO4 decomposition reaction of to generate metal bismuth, and MnO2 added can suppress the decomposition reaction of the BiNbO4; using 0.2wt% CuO 0.5wt% MnO2 composite the dopant BiNbO4 ceramic good dielectric properties: εr = 42.58, Q × f = 18657GHz When the copper electrode cofired under protective atmosphere, the contact surface of the new phase is formed, the base body reduction reaction occurs to produce a metal bismuth and enriched in the electrode region. The results showed that despite the BiNbO4 dielectric properties are excellent, but can not be used for the preparation of monolithic microwave devices. ZnTiO3 ceramic system of the sintering temperature is relatively high, narrow ZnTiO3 interval of the relative thermal stability of the defect. This article was taken to add the Zn-B-Si glass to reduce the sintering temperature; the and Mn2 with Zn2 radius less can generate the (Zn, Mn) TiO3 solid solution by adding MnO2 to the stability of improve ZnTiO3 phase. The results showed: the added zinc borosilicate glass can reduce the sintering temperature to 870 ° C; of MnO2 added ZnTiO3 phase thermal stability can be increased to 1050 ° C; adjustment of the appropriate ratio (2wt% Zn-B-Si glass, 0.2wt % MnO2) sintering temperature of 870 ℃, the quality factor 22000GHz the microwave dielectric ceramic dielectric constant between 27-29; and co-fired with copper, the interface does not generate a new phase, with no significant element diffusion.

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