Structure and properties of self-sensitive luminescent composite coatings prepared by detonation gun spraying

Abstract

Abstract: Wear-resistant and self-sensitive luminescent composite coatings, made of high-aluminum bronze mixed with SrAl₂O₄:Eu²⁺,Dy³⁺ particles, were successfully prepared on steel 45# substrate by using ADM-4D detonation gun spraying device. Structural morphologies and luminous intensities of the composite coatings were observed and analyzed and further friction and wear behaviors of the composite coatings were investigated. Results show that the deposition rate of SrAl₂O₄ particles in the composite coating increases nearly 78.6% when the oxygen-fuel ratio of the detonation spraying goes up from 1.3 to 2.3, and thus the composite coatings become more densified, and the hardness and the bonding strength increases 24% and 75% respectively as a result. At an oxygen-fuel ratio of 1.3, the proportion of phosphorescent particles deposited effectively on the surface of the composite coatings reaches, up to 9.7%. The macroscopic luminescence intensity of the coatings becomes therefore highest in this case, and consequently the macroscopic indication effect of the coatings excited by UV lamp becomes also the best. The friction coefficient between the composite coatings and the 304 stainless steel increases by nearly 35%, whereas the wear rate decreases by about 47%, when the oxygen-fuel ratio rises up to 2.3.

Key words: detonation gun spraying, phosphorescent particles, composite coating, self-sensitive luminescent, friction and wear behavior

CLC Number:

TG146

LI Wen-sheng, ZHAO Wen-jie, CAO Chi, HE Ling, HU Chun-xia, YANG Xiao-tian. Structure and properties of self-sensitive luminescent composite coatings prepared by detonation gun spraying[J]. Journal of Lanzhou University of Technology, 2020, 46(6): 9-15.

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