TY JOUR TI TRIBOLOGICAL PARAMETERS AND STRUCTURAL CHARACTERISTICS OF COATINGS MADE OF CERAMIC POLYMERS OR COMPOSITE MATERIALS REINFORCED WITH QUASICRYSTALS AND CARBON NANOTUBES, OBTAINED BY HIGH-SPEED ION-PLASMA MAGNETRON SPUTTERING KW ion-plasma sputtering KW composite coatings KW nanocrystalline structure KW coefficient coefficient KW friction KW properties KW grid JO Bulletin of Bryansk state technical university AU Sil'chenko, O.B. PY 2021 IS 2021 PB Bryansk State Technical University