Nanodiamond particles (NDPs) have been considered as a potential lubricant additive to various tribological applications, such as water lubrication systems. In this study, the tribological properties of silicon carbide (SiC) lubricated by NDPs dispersed in water are investigated utilizing the ball-on-disk tribometer. It is found that the slight addition of NDP to water (i.e., 0.001 wt%) can distinctly accelerate the running-in process, which is necessary to achieve a friction coefficient (μ) as low as 0.01. This study also discusses two NDP functional terminations —hydroxyl and carboxyl. It is demonstrated that the use of carboxyl-terminated NDP over a wide range of concentration (0.001 wt%–1 wt%) yields a low friction force. In contrast, the ideal effective concentration of hydroxyl-terminated NDP is considerably limited because agglomeration in this material is more probable to occur than in the former. Meanwhile, when utilizing NDPs, the input friction energy (P_in, defined as the product of sliding speed and applied load) is found to have an essential function. Several sliding tests were implemented at various P_in values (50–1,500 mW) using carboxyl-terminated water-dispersed NDPs. It was observed that the μ and wear decreased with increasing P_in when 200 mW < P_in < 1,500 mW. However, when P_in < 200 mW, low friction with high wear occurs compared with the resulting friction and wear when pure water is used.

纳米金刚石颗粒（NDP）被认为是各种摩擦学应用（例如水润滑系统）的潜在润滑剂添加剂。在这项研究中，使用圆盘摩擦计研究了分散在水中的NDP润滑的碳化硅（SiC）的摩擦学性能。发现将NDP少量添加到水中（即0.001重量％）可以明显加速磨合过程，这对于实现低至0.01的摩擦系数（μ）是必要的。这项研究还讨论了两个NDP功能末端-羟基和羧基。结果表明，在较宽的浓度范围（0.001 wt％–1 wt％）范围内使用端羧基的NDP会产生较低的摩擦力。相反，羟基封端的NDP的理想有效浓度受到很大限制，因为与前者相比，这种材料更容易发生团聚。同时，在利用NDP时，输入摩擦能（发现P _in（定义为滑动速度和施加的载荷的乘积）具有基本功能。几个滑动测试在各种实施P_在使用羧基封端的水分散型NDPS值（50-1,500毫瓦）。观察到，当200 mW < P _in <1,500 mW时，μ和磨损随P _in的增加而减小。但是，当P _in <200 mW时，与使用纯水时产生的摩擦和磨损相比，会发生低摩擦，高磨损。