铜合金表面激光熔覆TiB_2增强镍基梯度涂层  

TiB_2 Reinforced Ni-Based Gradient Coating on Copper Alloy Surface by Laser Cladding

作　　者：房刘杨 姚延松[1,2] 闫华 张培磊[1,2] 高秋实 秦阳[1,2] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]上海市高强激光智能加工装备关键技术产学研开发中心,上海201620

出　　处：《中国激光》2017年第8期90-97,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(51405288;51605276);上海工程技术大学研究生科研创新项目(16KY0501;16KY0503)

摘　　要：以铝包镍(KF-6)和TiB_2为熔覆材料,利用激光熔覆技术在铜合金(Cr-Zr-Cu)表面制备出了以KF-6为过渡层,以TiB_2增强镍基复合涂层为强化层的梯度涂层。研究结果表明,熔覆粉末中TiB_2含量不同,其在强化层中的组织形态存在明显差异;强化层的平均硬度介于1150~1450HV之间;当TiB_2质量分数为10%时,梯度涂层具有最小的磨损率;当TiB_2质量分数为30%时,梯度涂层具有较为平稳的摩擦系数(约为0.4);处于基体和强化层之间的过渡层,能有效减弱强化层与基体之间成份和硬度的突变,使梯度涂层的成分及硬度平滑过渡。The gradient coating with the nickel-aluminum （KF-6） as a transition layer and with the TiB2 reinforced Nibased composite coating as a strengthened layer is fabricated by laser cladding on copper alloy （Cr-Zr-Cu） surface with KF-6 and TiB2 as cladding materials. The study results show that the microstructural morphology of TiB2 is obviously different in the strengthened layer when the TiB2 content is different in laser cladding powders. The average microhardness of the strengthened layer is between 1150 HV and 1450 HV. The gradient coating has the lowest wear rate when the mass fraction of TiB2 is 10%. When the mass fraction of TiB2 is 30~, the coefficient friction of the gradient coating is stable （about 0.4）. The transition layer between the strengthened layer and the substrate can effectively reduce the abrupt changes of the composition and microhardness between the strengthened layer and the substrate, which makes the transitions of the composition and microhardness smooth in the gradient coating.

关 键 词：激光技术 激光熔覆 铜合金 铝包镍 TIB2 梯度涂层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]