摘要
考察了厚度对等离子喷涂HA涂层孔隙率、残余应力、结合强度、耐磨性能等的影响.随着涂层厚度由28μm左右增加至58.5 μm左右,残余应力先由压应力转变为拉应力,之后再转变为压应力;涂层结合强度由约33.5 MPa降低至约22.4 MPa.不同厚度的HA涂层的磨损机制均为黏着磨损且涂层的摩擦系数均约为0.65.涂层磨损速率随涂层厚度增加呈现先增加后降低的趋势变化.厚度通过影响涂层残余应力类型及大小的方式影响其结合强度,进而影响涂层耐磨性.
Abstract
This paper investigates the influence of thickness on various aspects of plasma sprayed hydroxyapatite(HA)coatings,including porosity,residual stress,bonding strength,and wear properties.As the coating thickness increases from approximately 28 μm to around 58.5 μm,the residual stress turns from compressive to tensile,followed by a reversion to compressive stress.In the meantime,the coating bonding strength decreases from approximately 33.5 MPa to about 22.4 MPa.The wear mechanism of the HA coatings with various thicknesses is identified as adhesive wear,with the friction coefficient of the coatings remaining approximately 0.65.The coating wear rate exhibits a trend of initial increase followed by decrease as the coating thickness increases.Thickness influences coating bond strength by affecting the type and magnitude of residual stress,thereby impacting the overall wear resistance of the coating.
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