초록 ▼

The compositions of the present invention comprise alumina and minor proportions of a ternary glass sintering aid from the system: BaO-MgO-SiO2. The compositions can be sintered in a reducing atmosphere to provide ceramics which find particular utility in electrical devices, e.g., in multilayer cera

The compositions of the present invention comprise alumina and minor proportions of a ternary glass sintering aid from the system: BaO-MgO-SiO2. The compositions can be sintered in a reducing atmosphere to provide ceramics which find particular utility in electrical devices, e.g., in multilayer ceramic sandwiches. The compositions are particularly amenable to formation by doctor blade slip casting techniques.

대표청구항 ▼

In a sintered multilayer ceramic sandwich comprising a plurality of ceramic layers separated by internal conductive metallization, the improvement wherein said ceramic layers consist essentially of a sintered alumina and material sinterable in a reducing atmosphere without blistering or mottling con

In a sintered multilayer ceramic sandwich comprising a plurality of ceramic layers separated by internal conductive metallization, the improvement wherein said ceramic layers consist essentially of a sintered alumina and material sinterable in a reducing atmosphere without blistering or mottling consisting essentially of alumina and a pre-fused ternary glass sintering aid from the system: BaO-MgO-SiO2 said sintering alumina ceramic material having a dielectric constant of at most 9.5, which permits adequate speeds upon use in computer circuitry, and a dissipation factor less than 0.005, said ternary glass sintering aid being selected from compositions within the area bounded by A-B-C in the Figure, which points A-B-C represent the following compositions: ________________________________ -Point Mol % BaO Mol % MgO Mol % SiO2 ________________________________ A 15.0 15.0 70.0 B 43.5 17.5 39.0 C 17.5 43.5 39.0 ________________________________