Self circulating heat exchanger

A self-circulating heat exchanger apparatus for dissipating heat from an electronic assembly, said apparatus comprising:

• an enclosure configured to define a closed-loop circulation path for coolant, wherein said path includes a vertical portion;
• and
• an electronic assembly capable of generating heat, wherein said electronic assembly is installed into the enclosure proximate to the vertical portion such that heat from the electronic assembly causes coolant in the vertical portion to rise, thereby inducing self-circulation of the coolant in the enclosure, wherein the electronic assembly comprises an electronic component that defines a first surface and a second surface opposite the first surface, said first surface electro-mechanically attached to a contact surface of a first heat spreader, and said second surface electro-mechanically attached to a contact surface of a second heat spreader, wherein the electronic assembly is installed into the enclosure such that both the first heat spreader and the second heat spreader are exposed to coolant, wherein the first surface includes a surface layer formed of silver, the contact surface of the first heat spreader includes an interface layer formed of nickel, and the electronic component includes a connection layer for attaching the surface layer to the interface layer, said connection layer formed of silver-tin solder.