(1. 浙江工業(yè)大學(xué) 激光先進(jìn)制造研究院，杭州 310023；
2. 高端激光制造裝備省部共建協(xié)同創(chuàng)新中心，杭州 310023；
3. 浙江工業(yè)大學(xué) 機(jī)械工程學(xué)院，杭州 310023；
4. 江蘇亞威機(jī)床股份有限公司，揚(yáng)州 225200)
摘 要: 針對(duì)Cu材料修復(fù)需求，采用激光輔助低壓冷噴涂技術(shù)(Low pressure cold spray, LPCS)在銅基體表面制備Cu涂層，研究了不同激光輻照功率對(duì)LPCS-Cu涂層微觀結(jié)構(gòu)及性能的影響。結(jié)果表明：LPCS-Cu涂層的孔隙率為1.23%，平均顯微硬度為124.0 HV0.2，熱導(dǎo)率為66.2 W/(m·K)，涂層/基體界面結(jié)合處存在明顯縫隙。隨著激光輻照功率的增大，LPCS-Cu涂層的表面趨于平整，孔隙率最低可達(dá)0.3%，平均顯微硬度可達(dá)143.4 HV0.2，熱導(dǎo)率可達(dá)170.2 W/(m·K)，且涂層與基體界面結(jié)合良好，無(wú)明顯縫隙。這是由于激光輻照提高了沉積顆粒和基體的塑性變形能力，促進(jìn)了沉積顆粒之間以及沉積顆粒與基體之間的相互結(jié)合，使涂層具有較好的致密性和界面結(jié)合，表現(xiàn)出較優(yōu)的導(dǎo)熱性能。
關(guān)鍵字: 冷噴涂；激光輻照；微觀結(jié)構(gòu)；顯微硬度；導(dǎo)熱性能
（1. Institute of Advanced Laser manufacturing, Zhejiang University of Technology, Hangzhou 310023, China;
2. Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310023, China;
3. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China;
4. Jiangsu Yawei Machine Tool Co., Ltd., Yangzhou 225200, China）
Abstract:In order to meet the repair needs of Cu-based materials, laser-assisted low pressure cold spray (LPCS) technology was used to prepare Cu coatings on the surface of a copper substrate in this study. The effects of different laser irradiation powers on the microstructure and performance of LPCS-Cu coatings were systematically investigated. The results show that the porosity, average micro-hardness and thermal conductivity of the LPCS-Cu coating are 1.23%, 124.0 HV0.2 and 66.2 W/(m·K), respectively. There are obvious gaps at the coating/substrate interface of the LPCS-Cu coating. As laser irradiation power increased, the surface fluctuation of LPCS-Cu coatings decrease. The porosity, average micro-hardness and thermal conductivity of the LPCS-Cu coating can be optimized to 0.3%, 143.4 HV0.2 and 170.2 W/(m·K) respectively by the assistance of laser irradiation. The interface between coating and substrate is well bonded without obvious gaps for the laser-assisted LPCS-Cu coating. Laser irradiation improves the plastic deformation ability of the deposited particles and the substrate, which is beneficial to the interfacial bonding between the deposited particles and between the deposited particles and the substrate. Therefore, the laser-assisted LPCS-Cu coating has better compactness and exhibits improved thermal conductivity performance with comparison to the counterpart without laser irradiation.
Key words: cold spray; laser irradiation; microstructure; micro-hardness; thermal conductivity
