张晓伟,刘国政,易俊超,刘洪喜.Ti6Al4V合金表面激光熔覆原位合成TiN/Ti-Al-Nb基复合涂层[J].表面技术,2020,49(10):61-68.
ZHANG Xiao-wei,LIU Guo-zheng,YI Jun-chao,LIU Hong-xi.TiN/Ti-Al-Nb Composite Coatings Prepared by In-situ Synthesis Assisted Laser Cladding Process on Ti6Al4V Titanium Alloy Surface[J].Surface Technology,2020,49(10):61-68 |
| Ti6Al4V合金表面激光熔覆原位合成TiN/Ti-Al-Nb基复合涂层 |
| TiN/Ti-Al-Nb Composite Coatings Prepared by In-situ Synthesis Assisted Laser Cladding Process on Ti6Al4V Titanium Alloy Surface |
| 投稿时间：2020-08-15 修订日期：2020-10-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.10.007 |
| 中文关键词: 激光熔覆 激光原位合成 氮化钛 钛铝铌金属间化合物 复合材料涂层 |
| 英文关键词:laser cladding laser in-situ synthesis titanium nitride titanium aluminum niobium intermetallic compounds composite coating |
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| 目的 为探究Ti6Al4V钛合金表面TiN/Ti-Al-Nb基复合涂层的激光熔覆制备新工艺，研究Nb含量对TiN/Ti-Al-Nb基复合涂层微结构及显微硬度的影响规律。方法 以Nb原子数分数分别为10%、15%和25%的Ti+Nb+AlN混合粉末为原材料，采用基于挤压预置粉末法的激光熔覆原位合成技术，制备出TiN/Ti-Al-Nb基复合涂层。通过X射线衍射仪（XRD）物相定性分析，并结合扫描电子显微镜（SEM）和能量分散谱仪（EDS），对TiN/Ti-Al-Nb基复合涂层中的物相进行定性分析，结合二元平衡相图，进一步分析激光原位化学反应机理。借助显微硬度计，研究TiN/Ti-Al-Nb基复合涂层微结构对截面显微硬度分布的影响规律。结果 在高能密度激光束作用下，混合粉末中Ti和AlN发生了充分的激光原位化学反应，生成了TiN陶瓷增强相，TiN陶瓷增强相的含量与Ti粉和AlN粉末的含量正相关。Nb含量的增加显著影响了Ti-Al-Nb基体相的种类，而不改变增强相的种类，随着Nb含量的增加，含Nb基体相的种类增多，发生Ti3Al→Ti3AlNb→Ti2AlNb→Ti39Nb→Nb7Al的转变。随着TiN增强相含量减少，复合涂层截面平均显微硬度从993.2HV0.5降至701.4HV0.5。结论 Nb含量的增加，不会改变TiN/Ti-Al-Nb基复合涂层增强相的种类，但可以降低TiN增强相的含量，从而降低复合涂层截面平均显微硬度。 |
| 英文摘要: |
| The work aims to explore the new laser cladding process of TiN/Ti-Al-Nb composite coatings on Ti6Al4V titanium alloy surface and study the influence laws of Nb content on microstructure and microhardness of TiN/Ti-Al-Nb composite coatings. The mixed powder of Ti, Nb and AlN with 10%, 15% and 25% Nb was used as raw materials to prepare TiN/Ti-Al-Nb composite coatings on Ti6Al4V alloy surface by in-situ synthesis assisted laser cladding based on extrusion presetting powder method. XRD phase qualitative analysis method, SEM and EDS were used to carry out qualitative analysis on the phase of TiN/Ti-Al-Nb composite coatings. According to the binary equilibrium phase diagram, the laser in-situ chemical reaction mechanism was analyzed further. With the help of microhardness tester, the influence laws of the microstructure of TiN/Ti-Al-Nb composite coatings on the cross-sectional microhardness distribution were studied. Under the high energy density laser beam, only Ti and AlN had sufficient laser in-situ chemical reaction to form TiN ceramic reinforcement. The content of TiN was positively correlated with the content of Ti powder and AlN powder. The increase of Nb content significantly affected the types of Ti-Al-Nb phases, but not changed the types of reinforcements. With the increase of Nb content, the types of Nb phases increased and transformed as follows: Ti3Al→Ti3AlNb→Ti2AlNb→Ti39Nb→Nb7Al. The average microhardness of the cross-section of the composite coating decreased from 993.2HV0.5 to 701.4HV0.5 with the decrease of TiN reinforcement. The increase of Nb content does not change the type of reinforcement of the composite coating, but can reduce the content of TiN reinforcement, thus reducing the average microhardness of the composite coating section. |
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