Structure And Working Principle Of Ceramic Lighting Fixtures

Modern ceramic lighting fixtures-particularly LED models-frequently utilize ceramic materials for heat sinks, circuit substrates, and chip heat spreaders. Alumina ceramics are commonly used for the heat sinks in these fixtures. The thermal conductivity of alumina ceramics depends significantly on their composition (purity); the commonly used 95% alumina ceramic has a thermal conductivity of approximately 22.4 W/m·K and a dielectric strength of 10 kV/mm.

 

Heat generated by the LED is conducted through the PCB and thermal interface material (such as thermal grease) to the ceramic lamp body, where heat exchange with the surrounding air takes place. Under natural convection conditions, the thermal performance of fixtures using 95% alumina ceramics rivals that of die-cast aluminum fixtures; the ceramic design allows for the effective use of component geometries to lower the overall operating temperature. Manufactured using molding and sintering techniques, alumina ceramics offer great design flexibility and excellent electrical insulation, making them particularly well-suited for compact lighting fixtures.