Determination of phase composition of sealing coating based on APC (aluminophosphate compounds)

V. I. Bolshakov, O. B. Zahorodniy, S. I. Veselova

Abstract


Goal. To investigate the phase composition of the obtained sealing coatings based on aluminophosphate compound (APC) and the impact of temperature rise on it. Methods. Qualitative X-ray phase analysis (XRPA) and differential thermal analysis (DTA) are used as the methods of research. Roentgenograms for structural analysis were obtained on a DRON-4-07 using filtered copper radiation in the secondary beam. Registration and initial processing of diffraction patterns was performed using the software package PDOS with the output of the diffraction patterns on the screen. Using the "loupe" option allowed to identify weak interference lines, which increased the accuracy of the method of qualitative XRPA. The thermograms for DTA received on the device type Termoskan-2. The results. It is revealed that base of coating is X-ray amorphous phase. There are following crystalline phases: Al, AlPO4, Al (PO3) 3, BN found in the coating. It is revealed that annealing doesn’t make a significant influence on the phase composition of the crystalline phases and the coating doesn’t lose properties after annealing during repeated thermal stress. Scientific novelty. The phase composition of the proposed sealing coatings based on APC and produced by plasma spraying, and the effect of annealing on the phase composition of the coating are investigated. The reaction of synthesis of primary material forming on the basis of APC for coating is offered. Practical significance. The results can be used in aviation technology in the development of gas turbine engines (GTE) and the design of the compressors. The sealing coating may be used to improve the reliability of the compressor and to increase the efficiency ratio of turbine engine. During the operation the compressor’s blades touch the sealing coating of compressor’s stator and grooves it without causing locking and destruction of the rotor. Therefore, the development of new sealing coating compositions that provide reliable operation of the GTE compressor, and determination of their properties and structure, are very important.


Keywords


phase composition; X-ray diffraction; differential thermal analysis; sealing coating; aluminophosphate compound; a gas turbine engine

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