Research of annealing influence on the hardness of detonation coatings from zirconium dioxide
Year: 2020
Type: article
Abstract: The article studied the effect of annealing on the structure and properties of zirconium dioxide coatings obtained by detonation spraying. Detonation spraying was realized on a computerized detonation spraying complex of the new generation CCDS2000. Thermal annealing of coated samples was performed at temperatures of 900 °C, 1000 °C, and 1100 °C. It was determined that the microhardness of zirconium dioxide coatings increases by 10–25 % depending on the annealing temperature after annealing. The results of nanoindentation showed that the nanohardness of the coatings after annealing at 1000 °C increases by 50 %. It was determined that after annealing at 1000 °C, the elastic modulus of the coatings increases, which indicates a decrease in plasticity and an increase in the strength of the coatings.. X-ray diffraction analysis showed that the phase composition of coatings before and after annealing consists of t-ZrO2. After annealing occurs there is an increase in the degree of t-ZrO2 tetragonality. Electron microscopic analysis showed that an increase in the number and size of micro-continuity in the form of thin layers after annealing. Determined that increase the hardness of zirconium dioxide after annealing at 900–1100 °C is associated with a higher degree of tetragonality t-ZrO2 phase.
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4393123409