钇浓度与沉积方法对 KNA-82 密封涂层晶格参数的影响

Purpose. To establish the patterns of changes in the crystal lattice parameters of the KNA-82 sealing coating depending on the yttrium concentration within the range of 0.1–0.5 wt.% and the deposition method -flame spraying and ion-plasma deposition and to determine the alloying range in which structural changes are most controllable. Research methods. The lattice parameters were determined by X-ray diffraction analysis using CuKα radiation (λ = 1.5418 Å). Interplanar spacings were calculated according to the Wulff-Bragg law, while the cubic lattice parameters were determined using the Miller indices of the diffraction peaks. The initial diffraction angles and calculated values were obtained from the experimental data table. Results. For ion-plasma coatings, increasing the Y content from 0.1 to 0.5 wt.% resulted in an increase in both analyzed lattice parameters: from 4.0525 to 4.0543 Å and from 4.2297 to 4.2332 Å. For flame-sprayed coatings, the dependence was non-monotonic: at 0.3 wt.% Y, a local decrease to 4.0519 and 4.2322 Å was observed, followed by an increase to 4.0567 and 4.2356 Å at 0.5 wt.% Y. The most pronounced difference between the deposition methods was observed at 0.3 wt.% Y. Scientific novelty. The regularities of the effect of yttrium concentration within the range of 0.1–0.5 wt.% on the crystal lattice parameters of KNA-82 coatings were established. It was shown that the nature of structural changes depends significantly on the coating deposition method. The obtained results make it possible to substantiate a rational yttrium content with consideration of the deposition technology. Practical value. The obtained results can be used to select a rational yttrium content in KNA-82 coatings depending on the deposition method and the required structural characteristics.