目的 探究立方氮化硼cBN微粒粒径及含量对复合电沉积的影响，提升Ni-cBN复合镀层的高温耐磨性。方法 在镀液中添加不同粒径(~0.5、3.0、10 μm)及不同含量的cBN颗粒制备Ni-cBN复合镀层，采用溶解称重法测试镀层复合量，通过扫描电镜(SEM)、显微硬度计和高温球盘磨损试验等评价不同复合镀层的微观结构、硬度及高温耐磨性。结果 cBN微粒粒径为0.5 μm时，颗粒易发生轻微团聚，复合量难以大幅度提高;选择3.0 μm和10 μm的cBN颗粒，一定程度上利于提高复合量。整体上说，复合量越高、微粒粒径越大，复合镀层的平均硬度越高。但在相近复合量下，3.0 μm颗粒复合的镀层颗粒分布均匀性更佳。相比于纯Ni层，Ni-cBN复合镀层中弥散分布的cBN颗粒，提高了镀层硬度，改善了镀层的耐磨性。对于不同粒径的颗粒，小颗粒(~0.5 μm)复合的镀层的摩擦系数略低，但粘着磨损较为严重;大颗粒(~10 μm)复合的镀层的粗糙度较高，以磨粒磨损为主。结论 镀液中cBN微粒的粒径及含量直接影响镀层复合量及耐磨性。选择粒径为3.0 μm的cBN颗粒、控制cBN复合量为40.5%时，Ni-cBN复合镀层的显微硬度>600HV，且高温耐磨性更佳。

The effect of cBN particle size and content on composite electrodeposition was explored to improve the high temperature wear resistance of Ni-cBN composite coating. Ni-CBN composite coatings were prepared by adding different sizes (~0.5 μm, 3.0 μm, 10 μm) and content of cBN particles into the electrolyte. The composite amount of the coatings were measured by dissolving-weighing method. The microstructure, microhardness and high-temperature wear resistance of different composite coatings were evaluated by scanning electron microscope (SEM), micro-hardness tester and ball- disc wear test at 600 ℃, etc. The results showed that the particles tended to agglomerate slightly and the composite amount of cBN in the coating was difficult to greatly increase when the size of cBN particle was 0.5 μm. It would help to increase the composite amount of cBN to a certain extent if 3.0 μm or 10 μm cBN particles were chosen. In general, the higher composite amount of cBN and the larger size of particle, the average hardness of composite coating was higher. However, the particle distribution uniformity in the composite coating with 3.0 μm cBN particles was better under the similar composite amount. Compared with the pure Ni plating, the cBN particles dispersed in the Ni-cBN composite coating increased the coating hardness and improve the wear resistance of coating. For the composite coatings with small particles (~0.5 μm), the friction coefficient was slightly lower but the adhesive wear was more serious. Meanwhile, the composite coatings with large particles (~10 μm) had higher roughness and mainly suffered from abrasive wear. In summary, the size and content of cBN particles in the electrolyte directly affected the composite amount and wear resistance of the coating. When the size of cBN particles was ~3.0 μm and the composite amount of cBN was controlled to 40.5 vol%, the microhardness of Ni-cBN composite coating was above 600HV, and the high-temperature wear resistance was better.