Abstract
Though traditional microwave dielectric ceramics have great dielectric properties, they have a big problem on high sintering temperature. The over high sintering temperature make these ceramics limited on the application of MLCC.This research is going to find out a glass having sufficient microwave dielectric properties for substrate material, and then discusses the reaction between the glass and the dielectric ceramics. There are three parts in the theme, first, the measurement of microwave dielectric properties of the glass. Second, the effect of adding dielectric ceramic. Third, the diffusion between the glass and ceramic. In the first part, we made the RBAS (RO-B2O3-Al2O3-SiO2) series and the RBS (RO-B2O3-SiO2) series glass (R=Mg, Ca, Sr, Ba). Then do the temperature coefficient, phase transformation temperature and dielectric property measurement. We find that the BABS glass has the best dielectric property (K=8.03, Q*f=4232). Then we’ll compare the two series with the commercial glass GP052A. In the second part, we discuss about effects of adding ratio of dielectric ceramic in the two series of glass and the sintering temperature. We found that at MCT:BBS=5:5, 900 0C sintering, we got the best dielectric property(K=6.27, Q*f=9856). As the sintering temperature increase, the densification increases, and the dielectric property also increases. When MCT:MABS=40:60, we got almost 100% theory density, and after 1000 0C sintering, it’s dielectric property is great in the whole system (K=6.78, Q*f=9418). In the third part, we made the diffusion couple of the nine glass and the (Mg,Ca)TiO3. Found that all the glass have nice wetting properties, and had a thin diffusion band between the glass and the MCT.