Fabrication method of hexagonal boron nitride (h-BN)-based thermally-conductive composite film

A fabrication method of a hexagonal boron nitride (h-BN)-based thermally-conductive composite film, comprising the following steps:

• S1. attaching a first adhesive layer to an h-BN film carried on a carrier film, and separating the h-BN film from the carrier film to obtain a first resulting film, wherein an adhesive layer side of the first resulting film is defined as a first side and an h-BN film side of the first resulting film is defined as a second side;
• S2. attaching a second adhesive layer to the second side of the first resulting film obtained in S1 to obtain a second resulting film;
• S3. pasting a high-power graphite film to the h-BN film side of the second resulting film obtained in S2 to obtain a third resulting film;
• S4. attaching a third adhesive layer to a graphite film side of the third resulting film obtained in S3 to obtain a fourth resulting film;
• and
• S5. shaping the fourth resulting film obtained in S4 according to a required size to obtain the h-BN-based thermally-conductive composite film.