Investigations of Density and Porosity of Coatings Made of Ceramic-Polymeric or Composites With Quasi-Crystals Obtained With Gas-Detonation Method and Method of Gas-Dynamic Sputtering

Abstract

The work purpose consists in the development of the procedure for density and strength definition through the method of hydro-static weighing in relation to titanium carbonitride-based coatings. 
 The development object – quasi-crystals based titanium carbonitride clad with nickel. Novelty and urgency of this work are based on the creation of polymeric antifriction materials intended for operation in the mode of hydro-dynamic friction. Frictionless and slider bearings with anti-friction coatings are the most efficient structures allowing the considerable increase of capacity and reliability of friction unit operation in machinery. 
 There are presented microstructure photos of coatings obtained with the method of gas-dynamic sputtering. 
 As a result of the technology developed it is defined that at the base a coating has the VN20 coarse-grain which has maximum parameters of static strength (bending, tearing and adhesion strength) at the expense of its structure and coarse grain. 
 As we move forward from the layer adjoining the base to the operation one of the coating we observe the decrease of structure grain (from 100 to 15 mkm) and a gradual change of the composition, micro-hardness increase. 
 As a result a carrying layer of KNTP35 coating has maximum parameters of long strength at the expense of a fine-grain structure and composition. It is characterized with increased resistance to thermal blow, tacking, spalling and higher impact elasticity and wear-resistance. 
 In the paper there is offered a method of hydro-static weighing for the determination of density and porosity regarding coatings. 
 According to the optimum technological mode are made samples and their porosity and density are investigated.