Creation and research of antistatic carbon coatings on fabric 05С8-КВ, modified by metal clusters

Application modes have been developed and carbon coatings modified with metal clusters on 05S8-KV fabric (manufacturer OJSC Mogotex) were created. The surface morphology of this coated fabric was investigated. It was shown that during the deposition of coatings from 12X18H10T steel targets a droplet phase is present on the coatings (the maximum droplet size reaches 3.5 μm). The paramagnetic absorption of the system carbon coating – clusters from the 12X18H10T steel target is investigated. It was found that the EPR spectrum contains a spectral line 94.4 mt wide, which indicates a high concentration of magnetic resonance centers, the effective value of the g-factor is 2.26 ± 0.01. In addition, a narrow spectral line with an effective g-factor of 2.04 ± 0.01 is recorded in the spectrum, the linewidth is 4.3 mt, which is associated with a high local concentration of unpaired electrons in carbon clusters with a weak nonresonant absorption at UHF (ultra-high frequrncy). The result of measuring the specific surface resistance on fabrics with this coating (side 1 / side 2) is 2.3.109 and 4.8.109 ohms, respectively, which is slightly lower than for a pure carbon coating.

Life cycle assessment of technical systems taking into consideration degradation processes in materials of constructions

Purpose: In the engineering analysis and transport forensic examination, there are often arise problems in establishing the causes and mechanism for the destruction of structural elements. At the moment, such problems are poorly formalized and practically do not take into account the degradation of the material and the gradient of its properties when destroyed. The purpose of this article was to build a methodology for determining the distribution of material properties at the initial time and establishing its compliance with the requirements of regulatory documentation. Design/methodology/approach: As a technique for solving the problem, was proposed the expansion of a function in a given basis with subsequent refinement of the solution using iterative algorithmic schemes. Findings: Using the developed approaches, it is established that in the surface layers of 12X18H10T steel (AISI 321), after technological modification under the conditions of laser doping, functional-gradient layers are formed with the material viscosity level characteristics at 0.8, which corresponds to the established norms, and their destruction occurred as a result of excessive loads. Practical implications: With the using of the developed methods makes it possible to solve the problem of technical forensic examination to determine compliance to the requirements the properties of functional gradient materials in initial time. Originality/value: The technique of solving inverse problems of fracture mechanics for functional gradient materials is shown for the first time.