International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Decision making methods have been examined within the context of conflicting criteria. Mechanical properties of a number of plasma sprayed coatings based on the modified alumina powder have been given for the purpose of comparative analysis. The modification has been performed by two different methods: 1) by cladding the alumina powder with Ti and Al metal sheaths where the PVD method has been employed; 2) by mechanochemical processing inside planetary ball mill with the titanium oxide nanopowder added. For coating selection, weighed characteristics technique has been used in conjunction with the digital logic and the proposed improved approach to the linear and non-linear data normalization. A conclusion has been made that the most effective, as far as the wear resistance parameter is concerned, are the coatings obtained as a result of the clad alumina powder spraying

In practice there are several known methods of inserting the nanopowder to the welding layer, they are specified according the conditions needed for the welding process. This article examines some new and innovative opportunities of liquid phase modification through insertion of nano-sized particles without being melted, according to TIG and Impulse TIG overlay welding methods.

A comprehensive study of the structure and electrical properties of nanopowder system based ZrO₂ + Y₂O₃ 3mol% was conducted. The presence of electrically continuous ion atmosphere, which consist from hydrogen-containing functional groups with different spin-spin relaxation times of hydrogen nuclei 1H was revealed. An original method of investigation of electrical properties of nanoparticles and surrounding ionic atmosphere based on electrochemical impedance spectroscopy was suggested.