Selectively Arc Spraying Metal On Graphite Fins For Solderability
Original Publication Date: 2003-Jun-05
Included in the Prior Art Database: 2003-Jun-05
Graphite heat sinks have low cost and high thermal performance. The challenge is to fabricate large size graphite heat sinks with flat thermal faces. One graphite heat sink design that has been proven feasible uses copper heat sink base and graphite fins. The graphite fins are made solderable by arc spraying them with a metal layer. The metal coated graphite fins are soldered into slots in the copper base. The problem is that the graphite fins are quite fragile for the arc spraying operation that involves grit blasting followed by arc spraying. In addition, the present state-of-the-art arc spraying process is very expensive. This invention solves this problem by using a fixture that protects the fins during the arc spray coating process and makes the process more cost effective.