from the conferences organized by TANGER Ltd. provisional website
The main problem to the use of aluminum oxide as a coating material is its brittleness due to low toughness and low bending strength. The combination of high hardness, strength, fire resistance inherent in aluminum oxide, with plasticity and thermal conductivity, characteristic for titanium causes interest in coatings obtained on the basis of a composite of Al2O3 and Ti. A five series of nanostructure coatings from composite the titanium and aluminum oxide powders have been prepared on a corrosion-resistant steel substrate by a new multi-chamber gas-dynamic accelerator (MCDS) with different powder composites Al2O3/xTi (x = 3 %, 13%, 25%, 40%, 50%). It was found that the addition of Ti powder to the Al2O3 powder leads to changes in the structural-phase composition and the hardness of the coatings obtained, the namely contributes to the formation of the intermetallic phase of AlTi3, which causes an increase in hardness (by 1.2 ... 1.3 times) of such coatings. To improve the structural characteristics it was conducted annealing of the obtained coatings. It was found that coatings from a composite of Al2O3/Ti powders contain twice as many particles of phase separations of nanoscale type as compared with Al2O3 coatingsKeywords: alumina-titanium coatings; multi-chamber gas-dynamic accelerator; microstructure; porosity; hardness; wear resistance; heat resistance; annealing.
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