Al-based metal matrix composites (MMCs) coatings, prepared by cold spray, have been extensively investigated in recent years. However, only a fraction of the ceramic reinforcement particles could be retained in the final deposit due to the rebound of the hard ceramic particles. Thus, improving the ceramic content in MMCs has been a longstanding issue. To address this issue, for the first time, the effect of particle size of the metal matrix as well as the reinforcement phases on the retention of ceramic particles (in the composite) was simultaneously studied. For this purpose, 12 different kinds of mechanically blended Al/B₄C feedstock powders (with different particle sizes) were deposited by cold spray to prepare composite coatings. The results showed that the content of B₄C in the prepared Al/B₄C coating increases from ~ 20 to ~ 30 vol.% with the decrease in Al particle size from 42 to 11 µm. Finally, a mechanism, elaborating the influence of metal matrix particle size on the retention of ceramic particles in the coating, was proposed. The hardness test for selected Al/B₄C composite coatings was performed, which is consistent to the change trend of B₄C content.

近年来，通过冷喷涂制备的铝基金属基复合材料（MMCs）涂层得到了广泛的研究。然而，由于硬质陶瓷颗粒的回弹，只有一小部分陶瓷增强颗粒可以保留在最终沉积物中。因此，提高 MMC 中的陶瓷含量一直是一个长期存在的问题。为了解决这个问题，首次同时研究了金属基体的粒径以及增强相对陶瓷颗粒（在复合材料中）的保留的影响。为此，通过冷喷涂沉积了12种不同的机械共混Al/B ₄ C原料粉末（粒径不同），制备了复合涂层。结果表明，B _4的含量制备的 Al/B ₄ C 涂层中的 C 随着 Al 粒径从 42 µm 减小到 11 µm 从 ~ 20 vol.% 增加到 ~ 30 vol.%。最后，提出了一种机制，阐述了金属基体粒度对陶瓷颗粒在涂层中的保留的影响。_{对选定的Al/B 4} C复合涂层进行硬度测试，与B ₄ C含量的变化趋势一致。