The rotor for the cryogyroscope must be continuous and has the following characteristics: low density, high strength, low thermal coefficient of linear expansion. As a substrate material, it was chosen a carbopyroceram (CPC). This material based on carbon, has a crystal structure, which includes boron. The material is well compatible with the niobium coating obtained by electrolysis that makes it suitable for use as a rotor substrate.

The use of such combination a carbopyroceram substrate and a niobium coating as a cryogyroscope rotor will significantly improve the accuracy of the device and improve its performance. The absence of deformations under the influence of centrifugal forces during its rotation leads to improving the quality of the suspension in terms of increasing reliability and overload capacity.

A galvanostatic electrolysis in the NaCl – KCl – NaF (10 wt.%) – K₂NbF₇ – Nb melt was used for deposition of niobium coatings at temperature 750 °C, and time of process from 8 to 12 hours. The coatings were continuous and smooth due to the special design of the cathode. The rotation speed of the stirrer in all experiments did not change and was chosen equal to 35 rpm. Such conditions made it possible to obtain coatings with the thickness up to 150 μm.

The main characteristics of the niobium coatings are purity, roughness, nonsphericity and superconductivity. Spectral quantitative analysis and gas chromatography of niobium coatings detected the following contents of impurities (ppm): Mn < 2; Mg < 3; Si < 10; Fe < 10; Ni < 5; Pb < 5; Sn < 5; Ti < 10; Al < 5; Co < 10; Mo < 10; Ca < 10; Zr < 20; V < 3; Cu ≤ 10; Cr < 5; O₂ = 100; N₂ < 10. The roughness of the obtained coatings was R_a = 0.4 μm and nonsphericity was S_p = 0.2 μm. The main superconducting properties of niobium coatings with the abovementioned concentration of impurities were as follows: T_c = 8.24 K, H_c1 = 1.24 O_e and H_c2 = 3.81 O_e.