Abstract
This work were studied the effect of technological parameters of detonation spraying on the phase composition and tribological characteristics on the bases of NiCr and Al2O3 coatings. As well as there was obtained and investigated multilayer coating on the bases of NiCr/NiCr- Al2O3/Al2O3 . It was determined that during detonation spraying the phase composition of Al2O3 coatings strongly depends on the degree of filling the borehole with a gas mixture. The a - Al2O3 -phase content in the coatings increases when the degree of filling is 63% and 54%. Only one CrNi3 phase is observed on the diffractograms and only increase of reflex intensity (020) at barrel filling by 58% is observed by sputtering on the bases of NiCr coatings in different degrees of barrel filling. The results of the coating nanohardness study showed that the hardness of the Al2O3 coating increases depending on the content of a- Al2O3 in it. Al2O3 coating has the maximum nanohardness values and is 16.42 GPa at the borehole is filled to 63%. The nanohardness of NiCr coating has the maximum values at barrel filling by 58% and consisting of 8.02 GPa.
Highlights
One of the most serious problems in modern technology is the necessity to ensure conformity between the properties of materials used in various branches of production and the increasingly harsh conditions of their operation
This work were studied the effect of technological parameters of detonation spraying on the phase composition and tribological characteristics on the bases of NiCr and Al2O3 coatings
One CrNi3 phase is observed on the diffractograms and only increase of reflex intensity (020) at barrel filling by 58% is observed by sputtering on the bases of NiCr coatings in different degrees of barrel filling
Summary
One of the most serious problems in modern technology is the necessity to ensure conformity between the properties of materials used in various branches of production and the increasingly harsh conditions of their operation. High-speed spraying processes can significantly expand the capabilities of conventional thermal spraying of coatings used to protect parts from wear, corrosion, etc. The detonation process accelerates the powder particles to high speeds (up to 1000 m/s), melting them and depositing them on the sprayed surface. The advantages of this method are: low porosity of the coating, high bonding strength with the base of the processed part, low thermal impact, which allows avoiding undesirable thermal stresses and warping even of thin-walled parts of complex design [5,6,7]
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