| abstract |
A sintered ceramic which has a high mechanical strength and excellent heat dissipation properties and which, when bonded to a copper sheet, is less apt to generate voids at the interface therebetween. The sintered ceramic (1) is for use as an insulating substrate on which an electronic component is to be mounted. The sintered ceramic is characterized by being produced from a powder material comprising alumina as the main component, partially stabilized zirconia, and magnesia, the upper limit of the content of the partially stabilized zirconia being 30 wt.% relative to the total weight of the powder material, and the content of the magnesia being in the range of 0.05-0.50 wt.% relative to the total weight of the powder material. The sintered ceramic is further characterized in that 80-100% of the zirconia crystals contained in the sintered ceramic have a tetragonal phase. |