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《Journal of South China University of Technology(Natural Science Edition)》 2014-01
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In-Situ Synthesis of TiN Coating on Titanium Alloy Surface by EDM with Functional Electrode

Xu An-yang;Liu Zhi-dong;Li Wen-pei;Qiu Ming-bo;Tian Zhong-jun;College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics;  
Proposed in this paper is a new method to avoid the defects on titanium alloy surface formed during the EDM-induced ablation machining with functional electrode. In this method,nitrogen gas is injected into the processing area through the original processing system,and the electric spark discharge is adopted to trim the machined surface. With the help of the heat due to the discharge,a reaction of nitrogen gas and titanium occurs,and the TiN coating is thus synthesized in situ. It is found from the SEM,XRD and microhardness test results of TiN coating that( 1) the electric spark discharge process is stable and continuous in the process of coating formation and is of efficient energy utilization;( 2) the coating is a dense,uniform and continuous layer dominated by TiN strengthening phase,with a thickness of more than 400 μm;( 3) the microhardness of the coating reaches 1761. 8, which is 4. 7 times more than that of the matrix;( 4) there exists a metallurgical combination with high bonding strength and even TiN phase distribution between the coating and the matrix; and( 5) the synthesis reaction has a strong reverse plating effect on the electrode,which causes a TiN strengthening phase-dominated electrode end face,effectively reduces the electrode spoilage,avoids the coating pollution caused by electrode elements,and effectively maintains the purity of TiN phase in the coating.
【Fund】: 国家自然科学基金资助项目(51175256 51205197);; 江苏省自然科学基金资助项目(BK2011732);; 航空基金资助项目(2011ZE52060);; 江苏省普通高校研究生科研创新计划资助项目(CXLX12_0138);; 中央高校基本科研业务费专项资金资助
【CateGory Index】: TG661
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