The problem of wear-resistant coatings quality

The article aims at solving a problem concerning the express evaluation of the wear-resistant nanostructure coatings quality using the method of ultra-fluid jet examination. Conducted research activities have shown that an intensity of the coating delamination from the substrate depends on the stress concentration level in the test sample. The proposed informatively methodological procedure of ultra-fluid jet examination will allow prompt estimation of physical-and-mechanical parameters and operational condition of coatings being deposited on samples and passed fatigue loading. The offered procedure can be effectively used for selecting the coating material, substrate, and efficient modes of application

Modernization of technology of composite constructional ceramics operational dynamic properties estimating by means of a hydroabrasive ultrastream

The article considers a possibility to use the ultrajet diagnostics methods for definition of ceramics operational characteristics at the stage of production. The ultrajet technology means a complex of processing methods or research of constructional materials, which are subjected to the high-speed compact stream of liquid. In particular, the article considers the test method of the constructional ceramics used as a means of an armored protection, which means the influence of an water ultrajet flowing out at high speed (800 m/s) from a nozzle with a diameter of 0,1 mm. By quantity of the ceramics, which has been taken away from a zone of ultrajet influence, the article draws conclusion concerning the operational properties of a studied sample of ceramics. Apart from a widely used method of ceramics shooting, this way allows us to obtain information on a studied armor without using special equipment (the ballistic stand). However, the goal of the offered way is to obtain information on operational characteristics of a sample at the stage of production, the subsequent tests using shooting thus are not excluded.The possibility to use the ultrajet diagnostics methods as an addition to shooting is revealed from results of the experiments made with samples of ceramics after three types of tests such as shooting using a rigid drummer, ultrajet impact on a sample (including that of with using abrasive particles available in liquid), and static loading tests of samples. By results of each type of tests the misrostructure analysis of demolition zone of samples was carried out. The analysis has shown a similarity of a microstructure of dynamic influence zone on the samples subjected to shooting by the rigid drummer and an ultrajet (including that of with available abrasive particles). Thus, at static tests the demolition zone was essentially different in microstructure from the samples under dynamic trials. So, the conclusion was drawn that the ultrajet diagnostics method is admissible for use in retrieving more information about a sample at the stage of production.</p