中国激光, 2014, 41 (7): 0703010, 网络出版: 2014-04-23
激光原位制备高体积分数与长径比的TiB短纤维与TiB2P增强钛基复合涂层
High Volume Fraction and Length-Diameter Ratio of TiB Short Fiber and TiB2P Reinforce Ti-Based Alloy Composite Coatings by Laser Synthesis In-Situ
激光技术 激光熔覆 TC4钛合金 钛基复合涂层 laser technique laser cladding TC4 titanium alloy TiB TiB titanium matrix composite coating
摘要
采用Ti+TiB2P、粗TiB2P与细TiB2P分别作为预置层,运用激光熔覆技术在Ti6Al4V表面原位合成TiB短纤维增强钛基复合涂层,并通过X射线衍射(XRD)与扫描电子显微镜(SEM)分析TiB短纤维的体积分数与长径比。结果表明,涂层主要由TiB短纤维和TiB2P组成。当采用Ti+TiB2P作为预置层时,涂层中TiB短纤维的长径比随着Ti含量的增加而减小;当采用粗TiB2P作为预置层时,涂层中较难形成较大体积分数的TiB短纤维;当采用细TiB2P作为预置层时,涂层中可同时形成较高体积分数与较大长径比的TiB短纤维。结合涂层中TiB短纤维的变化规律,探讨了形成机理。
Abstract
Preset layering powder containing Ti+TiB2P, coarse TiB2P and fine TiB2P are taken to prepare TiB short fiber, with reinforcing Ti-based composite coatings on the surface of Ti6Al4V through laser synthesis in-situ. Volume fraction and length-diameter ratio of TiB short fiber are analyzed by scan electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the coating is mainly composed of TiB short fiber and TiB2P. When Ti+TiB2P acts as a preset layer, length-diameter ratio of TiB short fiber reduces as the content of Ti increases; when coarse TiB2P acts as a preset layer, the coating is difficult to form a large volume fraction of TiB short fibers; when fine TiB2P acts as a preset layer, high volume fraction and large length-diameter ratio of TiB short fiber can be formed in the coating. The formation mechanism is explained through microstructure evolvement rule of TiB short fiber in the coating.
林英华, 雷永平. 激光原位制备高体积分数与长径比的TiB短纤维与TiB2P增强钛基复合涂层[J]. 中国激光, 2014, 41(7): 0703010. Lin Yinghua, Lei Yongping. High Volume Fraction and Length-Diameter Ratio of TiB Short Fiber and TiB2P Reinforce Ti-Based Alloy Composite Coatings by Laser Synthesis In-Situ[J]. Chinese Journal of Lasers, 2014, 41(7): 0703010.