In this paper, the use of the cold spray to deposit micron-sized high-density polyethylene (HDPE) particles on metal substrates was investigated. Previous attempts to cold spray polymers on metal substrates have been plagued by low deposition efficiencies and poor adhesion. Substrate and particle temperature, surface roughness and the thickness of a precursor film on the substrate were varied systematically. On smooth aluminum substrates at room temperature, increasing the temperature of the HDPE particles was found to improve the deposition efficiency with a maximum efficiency of DE = 0.81% for particles at T_p= 80 °C. The aluminum surfaces were then sanded with different grit sandpapers. The average surface roughness imparted onto the aluminum substrate was found to improve deposition efficiency and adhesion. Using a 50-grit sandpaper which resulted in an average roughness of R_A= 0.92 µm, a deposition efficiency of DE = 1.6% was measured for a T = 80 °C particle and a room temperature substrate. This is a 100% improvement over deposition while a 1100% increase in adhesion strength over a smooth aluminum surface was also found. Precursor LDPE coatings also increase the deposition efficiency even for the thinnest coating. Coatings one particle diameter thick were found to improve efficiency to DE = 3.35%.

在本文中，研究了使用冷喷涂在金属基材上沉积微米级高密度聚乙烯 (HDPE) 颗粒。以前在金属基材上冷喷涂聚合物的尝试一直受到沉积效率低和附着力差的困扰。基材和颗粒温度、表面粗糙度和基材上前体膜的厚度有系统地变化。在室温下的光滑铝基板上，发现提高 HDPE 颗粒的温度可以提高沉积效率，在T _p处颗粒的最大效率为DE  = 0.81%= 80°C。然后用不同的砂纸打磨铝表面。发现赋予铝基材的平均表面粗糙度提高了沉积效率和附着力。使用导致平均粗糙度R _A = 0.92 µm 的 50 粒度砂纸，对于T  = 80 °C 的颗粒和室温基底，测量的沉积效率为DE  = 1.6% 。这比沉积提高了 100%，同时还发现在光滑的铝表面上的粘附强度提高了 1100%。即使对于最薄的涂层，前体 LDPE 涂层也能提高沉积效率。发现厚度为一粒径的涂层可将效率提高至DE  = 3.35%。