Metal matrix composite aimed at HB-LEDs

Sept. 17, 2004
CPS Corporation, which designs and produces metal matrix composites, is offering AlSiC (aluminum silicon carbide), a metal matrix composite that the company says is ideal for thermal management of high flux LED products.
Applications include signal lamps, backlighting for signs, low-profile luminaries, task lighting, and display lighting.
AlSiC packages AlSiC's high thermal conductivity value of 200 W/mK provides the thermal management that is critical in the design of high-flux LED lamps. This high thermal conductivity value is said to enable maximum brightness in LED lamps at the lowest possible operating temperature.

Unlike copper and aluminum metals that have high thermal expansion values, AlSiC has a low coefficient of thermal expansion (CTE). This minimizes thermally-induced stress, leading to a reduction in the failures of delamination and cracking, says CPS, which ultimately improves the reliability of the LED lamp. With a compatible CTE value, the need for thermal stress compensating interface layers is eliminated.

CPS' net-shape fabrication process both produces the composite material and fabricates its geometry, including through-hole and threaded hole features. This cost-effective process is claimed to allow tight tolerances without the need for expensive machining, and provides high volume assembly yields.

The unique casting process also enables integration of very high thermal conductivity inserts (>1000 W/mK) for high thermal dissipation solutions.