激光原位沉积TiBx/TiC增强钛基复合梯度涂层中颗粒形成机理研究

项目名称： 激光原位沉积TiBx/TiC增强钛基复合梯度涂层中颗粒形成机理研究

项目编号： No.51201030

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 梁京

作者单位： 东北大学

项目金额： 25万元

中文摘要： 本项目以在钛合金表面获得高增强相含量、强韧性好、优异耐磨梯度涂层为目标，研究利用激光原位沉积分层制备以原位生成的TiBx 和TiC 多种颗粒增强相可控含量、尺寸、形貌及分布以及基底可控成分及显微组织为综合梯度的表面耐磨层。利用显微组织和性能分析、温度场测量、粉末加热反应生成相的原位衍射分析及计算模拟激光熔池温度场、粉流分布及颗粒反应相结合，研究不同沉积层材料及激光工艺条件下原位生成的增强相及基底显微组织演变等规律及控制机理，深入阐明沉积层中TiBx/TiC增强颗粒在激光原位沉积快速熔凝条件下形成规律及影响颗粒含量、尺寸、形貌及分布主要控制因素，实现TiBx/TiC良好的协同增强效果。研究梯度沉积层成分、微结构对其耐磨及抗氧化性能的影响。初步建立激光原位沉积工艺与沉积层厚度、显微组织等特征理论模型并优化工艺，发展其针对不同基材、不同表面性能需求有效的选定涂层材料及工艺，快速得到性能优良的涂层

中文关键词： 激光原位沉积；复合梯度涂层；TiBx/TiC颗粒增强；形成机理；

英文摘要： Using in-situ laser deposition technique to prepare wear-resistant surface layers with integrated gradient, which contents a variety of particle reinforcements with controlled content, size, morphology and distribution, such as in-situ generated TiBx and TiC phases etc.,as well as the matrix of controlled composition and microstructure was proposed in this project to achieve gradient coatings with high reinforcement content, good strength and excellent wear-resistant properties on the surface of titanium alloys. The microstructure evolution and control mechanism of in-situ formatted reinforcements and the matrix metal under different laser processing condition and with different deposition materials will be investigated using the microstructure and property analysis, the measurement and simulation of the temperature field of laser melting pool, the distribution of powder flow and the particle reactions,together with in-situ diffraction of the phase formation analysis. The main effect factors of the amount, size, morphology and distribution of the TiBx/TiC reinforced particles under the rapid solidification of the in-situ laser deposition will be elucidated to obtain a good TiBx/TiC synergistic effect. The wear and oxidation behaviour of the gradient deposited layers will be studied to clarify the influence of t

英文关键词： laser in situ deposition；graded composite coatings；TiBx/TiC particle reinforced；mechanism of particle formation；