Open AccessTribological Properties of AI2O3 Coatings Obtained by Detonation
Author(s) -
Bauyrzhan Rakhadilov,
Д.Б. Буйткенов,
Merey Rakhadilov
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1079/5/052035
Subject(s) - tribology , materials science , detonation , coating , abrasive , volume fraction , coefficient of friction , friction coefficient , wear coefficient , composite material , phase (matter) , volume (thermodynamics) , metallurgy , thermodynamics , chemistry , organic chemistry , explosive material , physics
In the present work, the effect of the detonation-spraying mode on the tribological properties of Al 2 O 3 coating was studied. It was found that a decrease in the delay time between shots is leading to an increase in the hardness and elastic module of Al 2 O 3 coatings. The obtained values of the coefficient of friction showed that a decrease in the delay time between shots leads to a slight reduction in the coefficient of friction. It is determined that reducing the delay time between shots to 0.25 seconds leads to an increase in the resistance of coatings to abrasive wear. It was found that the main reason for the increase in hardness and wear resistance with a decrease in the delay time between shots to 0.25 s is associated with an increase in the volume fraction of the α-Al 2 O 3 phase. It was found that increase in the volume fraction of the α-Al 2 O 3 phase is caused by the secondary recrystallization γ → α, which occurs due to the heating of particles during coating formation, i.e. due to increase in temperature above 1100 °C in single spots of the coating when they are put each other.