MICROSTRUCTURE RESEARCH OF FLOAT-TYPE GYRO ROTORS BY SCANNING ELECTRON MICROSCOPE 

Startseva A.V., Sharygin B.L., Litunenko E.G. Microstructure research of float-type gyro rotors by scanning electron microscope. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2019, vol. 19, no. 2,  pp. 247–254 (in Russian). doi: 10.17586/2226-1494-2019-19-2-247-254

Subject of Research. The methods are proposed for input control of the float-type gyro rotors, which are part of more than two hundred inertial navigation systems currently being in operation. The reliability of these systems depends directly on the reliability of the rotors. The deterioration in the quality of materials supplied and the increased frequency of technological discipline violations in recent years have led to an increase in the number of gyro corrupted during their production, associated with the jamming of the gyro-motor.Method. The developed methods of the rotor input control is based on the determination of the Al-Ni alloy composition for float-type gyro rotors, its homogeneity by the basic chemical elements and the evaluation of the surface quality of the rotors. The developed methods are based on the scanning electron microscopy application and electron probe microanalysesfor obtaining initial data and further processing by single-factor analysis of variance to determine the homogeneity of the composition. Main Results. As a result of the research, the variance of the alloy chemical composition of the researched rotors was revealed by basic and alloying elements, the surface topology of samples manufactured using the same technology was differentiated, impurity elements with dimensions from several micrometers and radically different chemical composition from the total alloy composition were determined. Practical Relevance. The developed method made it possible to identify the probable causes of the rotor descent caused by the non-compliance of the alloy chemical composition with technical requirements, the presence of undesirable impurities and inclusions, non-homogeneity of the alloy composition and micro-defects of the rotor surface.

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