The invention discloses a preparation method of an all-
diamond micro-channel radiator with a manifold type fluid path, and belongs to the field of heat dissipation of high-power devices. The manifold type all-
diamond microchannel is composed of a packaging cover plate, a
shunting substrate, a microchannel substrate and a packaging bottom plate. The preparation method comprises the following steps: firstly, a high-quality crack-free
diamond self-supporting thick film is prepared through a CVD preparation process of secondary
nucleation and dynamic adjustment of a deposition surface; the surface is flattened through mechanical
grinding and
polishing; then, the size of a rectangular micro-channel in diamond plates is shaped by adopting a special
laser processing technology; at the same time, a
welding surface is metalized to improve the
welding performance;and finally, the diamond plates are welded together in sequence through a vacuum
brazing technology, a manifold type all-diamond micro-channel
heat exchanger with the qualified size and groove type is obtained, and the manifold type all-diamond micro-channel
heat exchanger meets the heat dissipation design requirement of a high-heat-flux
heat exchanger. The micro-channel heat exchanger can be used for effective
heat management of high-power advanced equipment such as high-power communication and navigation satellites, directional high-energy weapons and
wide bandgap semiconductor radars.