METHOD OF PRODUCING HYBRID COMPOSITE MATERIALS WITH AN ELECTRICALLY CONDUCTIVE COATING Russian patent published in 2019 - IPC C08J5/06 C08J5/24 B32B27/38 B32B37/02 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to a method of producing structural laminar composite materials based on glass fabric or carbon fiber prepregs impregnated with a curable polymer and can be used in making fuselages in aircraft and aerospace engineering, as well as other purpose composite products, to strength and protective properties of which high requirements are met. Proposed method comprises metal coating of prepreg containing glass fabric or carbon fiber and polymer curable binder by plasma spraying of aluminum powder directly onto prepreg in two steps. First step is carried out at current intensity of plasmatron arc 120–140 A with introduction of disparate aluminum particles into binder, then current is increased to 150–180 A and solid metal layer is formed. Then prepreg layers are laid using metallized prepreg as outer layer and composite material is molded at temperature of 150 °C and pressure of 0.6–0.8 MPa with hardening of binder. Additional treatment of metal-coated surface of composite material is carried out by plasma-electrolytic oxidation in galvanostatic mode in conditions of anode or anode-cathode polarization of article at current density of 0.08–0.15 A/cm² in electrolyte, containing Na₃PO₂⋅12H₂O, Na₂B₄O₇⋅10H₂O and Na₂WO₄⋅2H₂O at the following components content, g/l: Na₃PO₄⋅12H₂O (20–30); Na₂B₄O₇⋅10H₂O (10–15); Na₂WO₄⋅2H₂O (2–3).

EFFECT: improving the quality of the obtained composite materials, improving their protective, including anticorrosive properties, and fire-resistance, while simplifying the technology and reducing the time required to mold composite articles.

3 cl, 7 dwg, 1 tbl, 3 ex