INTAKE MIXTURE FOR AN INSULATING COMPOSITION COMPRISING A LEAD-BASED GLASS, PRINTING INK HAVING SUCH A MIXTURE AND USE OF THIS INK FOR THE PROTECTION OF HYBRID MICROCIRCUITS ON A CERAMIC SUBSTRATE

摘要

The invention relates to the formulation of a starting mixture for an isolating composition comprising on the one hand a glass phase formed of Alumina AlO, Silicium S10, Boric anhydride and incorporating a PBO lead monoxide. AND ON THE OTHER HAND ONE OR MORE LEAD OXIDES HAS A DEGREE OF OXIDATION OF MORE THAN OR EQUAL TO TWO IN THE PULVERULENT FORM. / P P The invention also relates to a crimpable inking formed from such a composition. / P P THE INVENTION CONCERNS FINALLY A METHOD FOR PRODUCING A HYBRID MICROCIRCUIT ON A CERAMIC SUBSTRATE, INCLUDING THE USE OF THIS INK AS A SUPERIOR PROTECTIVE LAYER CALLED "ENCAPSULANT". / P P According to the present invention, such a mixture is remarkable in that the vitreous phase additionally comprises Zinc oxide ZnO, calcium calcium anhydride and CuO copper oxide, and that this vitreous phase amounts to 70%. 80 MIXTURE WHILE LEAD OXIDES OF OXIDATION DEGREE HIGHER OR EQUAL TO TWO REPRESENT ENT 30 TO 20 OF THE MIXTURE IN VOLUME. / P P ACCORDING TO A PREFERENTIAL REALIZATION, THIS MIXTURE IS REMARKABLE IN THAT THE GLAZING PHASE IS CONSISTING OF THE MOLAR PROPORTIONS OF THE FOLLOWING OXIDES: ALUMINUM ALO 5, SIO SILICA 40, BOR BORIC ANHYDRIDE BO 20, LEAD MONOXIDE PBO 22, CALCIUM ANHYDRIDE CAO 3, ZINC OXIDE ZNO 8, COPPER OXIDE CUO 2, IN THAT THE OXIDATION DEGREE OXIDE EXCEEDED OR EQUAL TO TWO CHOSEN IS THE LEAD DIOXIDE PBO AND IN THAT THE GLAZING PHASE REPRESENTS 75 AND LEAD DIOXIDE 25 IN MINERAL PHASE VOLUME. / P P APPLICATION: ENCAPSULATION OF HYBRID CIRCUITS ON CERAMIC SUBSTRATE. / P