Multi-layered ceramic enclosure

摘要

Techniques for fabricating a laminated ceramic housing that can be used for a handheld computing device that includes an enclosure having structural walls formed from a multi-layered ceramic material that can be radio-transparent. The multi-layered ceramic housing can be formed of a plurality of ceramic materials such as zirconia and alumina in any combination. The multi-layer ceramic substrate includes an inner layer and surface layers that sandwich the inner layer. The multi-layer ceramic substrate has an increased transverse strength due to the surface layers having a coefficient of thermal expansion (CTE) that is less than that of the inner layer.

主权项

1. A ceramic laminate enclosure for an electronic device, comprising:
an integral body defining a cavity to receive components of the electronic device, the integral body comprising:
an external surface layer in compressive stress and having a first coefficient of thermal of expansion;an internal surface layer defining at least a portion of the cavity, the internal surface layer in compressive stress and having the first coefficient of thermal of expansion; andan intermediate layer between the external surface layer and the internal surface layer, the intermediate layer in tension and having a second coefficient of thermal of expansion that is greater than the first coefficient of thermal expansion, wherein a transition region between the external surface layer and the internal surface layer has a stepped residual stress profile.