REFRACTORY COATINGS OF C-ME-SI AND C-ME-B-SI SYSTEMS FOR PROTECTION OF CARBON MATERIALS (CM)

The three-zoned structure of the coatings for protection from high-tem perature oxidation of carbon materials (CM) was grounded. The kinetic of formation and phase composition of diffusion coating C-Me-Si and C- Me-B-Si (Me = Ti, Zr or Hf) systems formed on CM (graphite and carbon/ carbon materials) have been studied. The coating on CM received by usi ng sequential metallization, boron- and silicium- deposition from disp ersive solid-phased media. The rate of formation coatings of C-Me-Si b y metallization and Si-deposition on CM decreases on the line: Ti--Zr- -Hf, and the formation carbide layers MeC by diffusion metallization C M describes linear-parabolic law have been shown. The velocity of boro n diffusion of the ''CM - MeC layer'' compositions is very little and it is increased on the line: Ti--Zr--Hf insignificantly. The formation of MeB(2) layer at the boriding are decreased of the velocity of sili ciding. The coating proposed hase three-zoned structure formed by comp ounds of C-Me-Si or C-Me-B-Si systems and intended for protection of C M from high-temperature oxidation (T>1400 degrees C). The laws of phas e form and destruction at high-temperature oxidation in air for these coatings are investigated.