中国激光, 2013, 40 (11): 1103008, 网络出版: 2013-10-24
TA15-2合金表面激光熔覆Ni基涂层物理与表面性能
Physical and Surface Performance of Laser Clad Ni Based Coating on a TA15-2 Alloy
摘要
在航空材料TA15-2钛合金基材表面激光同轴送粉熔覆Ni60A-B4C-TiN-CeO2混合粉末可生成硬质耐磨复合涂层。对该涂层进行扫描电镜与高分辨透射电镜微观组织观察。结果表明,大量纳米晶非晶相在该复合涂层中产生。纳米晶非晶相界面具有极高的结合能,可在一定程度上阻碍纳米晶长大;另外,大量纳米晶的产生使晶界自由能提高,导致涂层中点缺陷密度提高与晶格畸变的产生。整个涂层为非晶、纳米晶及其他晶化相共存。涂层较TA15-2基材表现出更好的耐磨损性能,涂层的主要磨损机制为磨粒磨损与粘着磨损。
Abstract
Coaxial powder feeding laser cladding of the Ni60A-B4C-TiN-CeO2 mixed powders on an aviation material TA15-2 titanium alloy substrate can form a hard wear resistance composite coating. Such coating is investigated by means of a scanning electron microscope (SEM) and a high resolution transmission electron microscope (HRTEM). Experimental results indicate that a large amount of nanocrystals-amorphous phases are produced in such composite coating. The nanocrystalline/amorphous interface owns a high bonding energy, which retards the growth of the nanocrystals in a certain extent; and the production of the nanocrystals lead the enhancement of free energy on the crystal boundary, which increases the density of point defect, causing the lattice distortions of the coating. Amorphous, nanocrystals and the other crystalline phases coexist in such coating. Such coating exhibits a better wear resistance than that of a TA15-2 substrate, and the main wear mechanisms of the coating are abrasive grain wear and the adhere wear.
李嘉宁, 巩水利, 王西昌, 锁红波. TA15-2合金表面激光熔覆Ni基涂层物理与表面性能[J]. 中国激光, 2013, 40(11): 1103008. Li Jianing, Gong Shuili, Wang Xichang, Suo Hongbo. Physical and Surface Performance of Laser Clad Ni Based Coating on a TA15-2 Alloy[J]. Chinese Journal of Lasers, 2013, 40(11): 1103008.