采用不同的喷砂压力对基体表面进行喷砂预处理,研究了基体表面状态的变化对HVOF喷涂TiAl-Nb/NiCrAl涂层结合强度的影响。结果表明：随着喷砂压力的增大,基体粗糙度及表面凹坑的深度和宽度增大,NiCrAl层与基体结合界面处孔洞等缺陷增多,同时基体表面残余砂粒的面积分数增加;涂层结合强度随基体粗糙度的增大,先增大后减小,当基体粗糙度为8.33μm时,结合强度达到最大值44.5 MPa。
Grit blasting pre-treatment on substrate surface of SUS316L stainless steel was carried out by changing the grit blasting pressure.Variation of the substrate surface state and its influence on bond strength of high velocity oxy-fuel sprayed（HVOF） TiAl-Nb/NiCrAl coatings were studied.The results show that substrate surface roughness,width and depth of pits on substrate surface,pores at the interface between substrate and NiCrAl coating,and area fraction of residual grits on the surface all increase with increasing of grit blasting pressure.The bond strength of coatings firstly increases and then decreases with increasing of substrate surface roughness,it can reach the maximum value of 44.5 MPa when the substrate surface roughness Ra is 8.33 μm.
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