LOW TEMPERATURE CO-FIRED MICROWAVE DIELECTRIC CERAMICS AND THE MANUFACTURING METHOD THEREOF

摘要

A microwave dielectric ceramic co-fired at low temperature and a manufacturing method thereof are provided to decrease the dielectric loss of the ceramic, and to obtain a microwave dielectric ceramic which is apt to be fired at lower temperature, and further to improve microwave dielectric property. A microwave dielectric ceramic composition co-fired at low temperature comprises at least one additive selected from a group consisting of BaCO3, Nb2O5, TiO2, ZnO and ZrO in addition to a composition comprising cordierite and glass frit of aPbO-bSiO2-cB2O3-dAl2O3-eK2O(in which, 50wt%<=a<=60wt%, 30wt%<=b<=40wt%, 5wt%<=c<=15wt%, 3wt%<=d<=10wt%, 0wt%<=e<=5wt%). The glass frit is added in the amount of 20 to 50vol%, and the additive is added in the amount of 0.1 to 10wt%. The manufacturing method of the dielectric ceramics composition comprises: the first step of mixing glass frit composition according to composition formula of aPbO-bSiO2-cB2O3-dAl2O3-eK2O(in which, 50wt%<=a<=60wt%, 30wt%<=b<=40wt%, 5wt%<=c<=15wt%, 3wt%<=d<=10wt%, 0wt%<=e<=5wt%) and melting the composition; the second step of preparing glass frit composition by forming the molten composition into a sheet and grinding the composition; the third step of mixing the prepared glass frit composition with at least one additive selected from a group consisting of BaCO3, Nb2O5, TiO2, ZnO and ZrO and cordierite and drying the obtained product; and the forth step of forming the dried powder and firing the product.