The present invention provides a plate core of solar plate heat collector and a metallic-membrane plating method of collecting plate selectively absorbing film, the plate core is welded by a
copper foil heat collecting plate and a
copper fluid medium arranged on the reverse of the heat collecting plate, an absorbing film is arranged on the front of the heat collecting plate, the absorbing film TiNxOy is a selective absorbing film. The absorbing film has a reasonable structure, better heat exchanging effect and high absorptivity etc. The metallic-membrane plating method adopts direct double targets vacuum sputter coater, using
copper foil as basic material,
titanium target as
cathode, treating the front of the
copper foil heat collecting plate in turns;
drying the
copper foil heat collecting plate; dried
copper foil heat collecting plate is placed in the
film coating room being vacuumized; the method adopts Ar bombarding the front of the copper foil heat collecting plate,
processing twice cleaning; connecting DC to
titanium target, inflating N2, O2 at the same time, TiNxOy selectively absorbing film is formed after reaction. The method has an advanced process, even cladding material, an even plane and high absorptivity and
low emissivity, the heat collecting plate and the selectively absorbing film are agglutinated powerfully.