CIRCUIT BOARD WITH HIGH STRENGTH AND HIGH RELIABILITY AND PROCESS FOR PREPARING THE SAME

摘要

A circuit board having at least one insulator layer and at least one conductor layer which includes at least one of the whole insulator layers in a sintered body containing beta -Si3N4 as a main component and at least one element selected from the group consisting of a rare earth element and an alkaline earth element, and at least one of the whole conductor layers contains at least one element selected from the group of IVb, Vb and VIb group of the periodic table, and at least one element selected from the group of a rare earth element and an alkaline earth element, and a Si element.