目的 提高钛合金的耐磨性能，拓宽其应用范围。方法 采用双辉等离子渗金属技术在TA18 (Ti-3Al-2.5V)钛合金表面制备ZrN改性层。采用GIXRD、SEM、EDS等分析改性层的相结构、微观形貌以及成分分布。采用粗糙度测试仪和纳米压痕仪测定改性层的表面粗糙度、纳米硬度和弹性模量。采用球-盘磨损试验机探究TA18基体和ZrN改性层在不同载荷下的摩擦学性能。结果 改性层表面组织致密均匀，呈现出“岛状”特点，无明显孔洞、裂纹等缺陷，粗糙度略微增加，物相组成为ZrN、ZrO2、TiN0.3三相共存，具有明显的ZrN(111)择优取向。改性层总厚度约为10 μm，包含3 μm的ZrN层、4 μm的Zr沉积层以及3 μm的Zr扩散层。纳米硬度和弹性模量分别为21.03 GPa和258 GPa，相比于基体，分别提高了4.34倍和0.87倍。结论 TA18基体在3种不同的载荷下磨损严重，磨痕表面存在大量的犁沟，并伴有明显的粘着特征，其磨损机理为典型的磨粒磨损和粘着磨损。ZrN改性层在低载荷下(330 g)发生轻微的磨粒磨损，中载(530 g)及高载(730 g)下磨痕区域出现了明显O元素聚集现象和少量的粘着特征，其磨损机理主要为氧化磨损和粘着磨损，不同载荷下ZrN改性层磨损区域均无明显剥落。

In order to improve the wear resistance of titanium alloy and broaden its application range, the ZrN modified layer was prepared on the surface of TA18 (Ti-3Al-2.5V) titanium alloy by double-glow plasma alloying technology (DGPA). The phase structure, micro-morphology and composition distribution of modified layers were analyzed by using GIXRD, SEM, EDS. The surface roughness, nano-hardness and elastic modulus of the modified layer were measured by using a roughness tester and a nano indenter. The tribological properties of TA18 substrate and ZrN modified layer under different loads were explored by using a ball-disk wear testing machine. The results indicate that the modified layers with dense and uniform surface structure and "island-like" characteristics, have no obvious defects such as holes and cracks. The surface roughness of ZrN modified layers is slightly increased and the phase composition is a coexistence of ZrN, ZrO2, TiN0.3, with obvious ZrN (111) preferred orientation. The total thickness of the modified layer is about 10 μm, with a ZrN layer of 3 μm, a Zr deposition layer of 4 μm and a Zr diffusion layer of 3 μm. The nano-hardness and elastic modulus of ZrN modified layers are 21.03 GPa and 258 GPa, respectively, which are 4.34 and 0.87 times higher than the matrix. The wear tests show that a large number of furrows exist on the surface of the wear scar and accompanied with obvious adhesion characteristics, and its wear mechanism is typical abrasive wear and adhesion wear. The ZrN modified layer has slight abrasive wear under the low load (330 g). An obvious O element aggregation and a small amount of adhesion characteristics appear in the wear scar area under the medium load (530 g) and high load (730 g), which reveals its wear mechanism is oxidative wear and adhesive wear. Meanwhile, there is no obvious peeling in the wear zone of the ZrN modified layer under different loads.