Garfias Andrea, Vaz Rodolpho, Albaladejo-Fuentes Vicente, Sánchez Javier, Cano Irene Garcia
Centre de Projecció Tèrmica, Departament de Ciència del Materials i Química Física, Universitat de Barcelona, Martí i Franquès, 1, 08028 Barcelona, Spain.
Materials (Basel). 2023 Jun 30;16(13):4735. doi: 10.3390/ma16134735.
Cold Spray Additive Manufacturing (CSAM) is a thermal spray technique that is typically used for the repair of metallic components. One of the challenges of CSAM is to improve the geometrical accuracy of the sprayed parts, along with overcoming the inferiority of the mechanical properties of the deposits by tailoring their microstructure with different deposition strategies. For this, Cu, Al, Ti, and Ti6Al4V substrates were reconstructed by two Cold Spray (CS) methods: Traditional (T) and a novel strategy, Metal Knitting (MK). The final geometry, microstructure, and mechanical properties of the reconstructed parts by these two methods were compared. Additionally, we investigated the effects of annealing on the microstructure of sprayed components and its influence on adhesion, resistance to erosion, and abrasive wear. The results indicate that annealing effectively reduces the microstructure defects of the remanufactured parts (up to 30% porosity reduction) and improves the adhesive strength (i.e., below 30 MPa for as-sprayed deposits, and up to 160 MPa for heat-treated Ti4Al4V deposits). Notably, the abrasive and erosive resistance of the Cu and Al annealed deposits sprayed by MK gave very similar results compared to their bulk counterparts, suggesting that it is an efficient method for the reconstruction of damaged parts.
冷喷涂增材制造（CSAM）是一种热喷涂技术，通常用于金属部件的修复。CSAM面临的挑战之一是提高喷涂部件的几何精度，同时通过采用不同的沉积策略调整沉积物的微观结构来克服沉积物机械性能的劣势。为此，采用两种冷喷涂（CS）方法对铜、铝、钛和Ti6Al4V基板进行了修复：传统方法（T）和一种新策略——金属编织（MK）。比较了用这两种方法修复的部件的最终几何形状、微观结构和机械性能。此外，我们研究了退火对喷涂部件微观结构的影响及其对附着力、抗侵蚀性和磨料磨损的影响。结果表明，退火有效地减少了再制造部件的微观结构缺陷（孔隙率降低高达30%），并提高了粘合强度（即，喷涂沉积物的粘合强度低于30MPa，热处理后的Ti4Al4V沉积物的粘合强度高达160MPa）。值得注意的是，与块状对应物相比，MK喷涂的铜和铝退火沉积物的耐磨性和抗侵蚀性结果非常相似，这表明它是修复受损部件的有效方法。
