Preparation method for W-Cu composite plate with Cu phase in finger-shaped gradient distribution

A preparation method for a W—Cu composite plate with a Cu phase in a finger-shaped gradient distribution, comprising the following steps:

• (1) mixing a WOX powder and a W powder to obtain a powder mixture;
• adding the powder mixture, a binder polyethersulfone, and a pore-forming agent polyvinyl pyrrolidone into an N-methylpyrrolidone solvent to obtain a first resulting mixture, and uniformly mixing the first resulting mixture by a ball milling in a planetary ball mill to obtain a slurry;
• wherein the WOX powder accounts for 50 wt. % or less of a mass of the powder mixture and is not 0;
• the binder polyethersulfone and the pore-forming agent polyvinyl pyrrolidone each independently account for 1-6% of the mass of the powder mixture;
• and the slurry has a solid content of 50-85 wt. %;
• (2) tape-casting the slurry on a PET film to obtain a green body, soaking the green body and the PET film in water together to partially remove the N-methylpyrrolidone solvent, then separating the green body from the PET film, and then drying the green body;
• (3) pre-sintering the green body at 500-800° C. under a H2 atmosphere to remove the binder polyethersulfone and reduce the green body, and then performing a heating to 800-2000° C. to sinter the green body to obtain a W framework with finger-shaped distributed pores;
• and
• (4) infiltrating Cu into the W framework to obtain a resulting framework, and then cooling the resulting framework along with a furnace to obtain the W—Cu composite plate with the Cu phase in the finger-shaped gradient distribution.