Microstructure of a Ni Matrix Composite Coating Reinforced by In-situ TiC Particles Using Plasma Cladding
来源期刊：材料热处理学报2004年第5期
论文作者：LIN Ping-hua WANG Ze-hua WU Yu-ping
关键词：plasma cladding; in-situ synthesis; microsttucture; composite coating; TiC particle;
摘 要：Plasma cladding process was used to prepare the TiC/Ni composite coating on the mild steel substrates. The TiC particles were synthesized in-situ. Microstructure and properties of the coating were investigated by optical microscopy, X-Ray diffraction, SEM, TEM and microhardness tester. The results show that the interface between the coating and the substrate is metallurgically bonded. The coating was uniform and almost defect-free when [Ti+C] varied from 10% to 20% after ball milling. The microstructure of the coating is mainly composed of γ-Ni dendrite,interdendritic eutectic (γ-Ni austenite, M23C6 and CrB) and TiC particles. Most of the TiC particles are spherical and a small fraction is blocky in size of 1 ～2μm. The TiC particles are smaller at the bottom than near the top of the coating.The coating has a gradient microstructure and a highest hardness of 1000Hv0.1.
LIN Ping-hua1，WANG Ze-hua1，WU Yu-ping1
(1.Department of Material Sciences and Engineering, Hohai University, Nanjing, China;
2.Department of Material Sciences and Engineering, Southeast University, Nanjing, China)
摘要:Plasma cladding process was used to prepare the TiC/Ni composite coating on the mild steel substrates. The TiC particles were synthesized in-situ. Microstructure and properties of the coating were investigated by optical microscopy, X-Ray diffraction, SEM, TEM and microhardness tester. The results show that the interface between the coating and the substrate is metallurgically bonded. The coating was uniform and almost defect-free when [Ti+C] varied from 10% to 20% after ball milling. The microstructure of the coating is mainly composed of γ-Ni dendrite,interdendritic eutectic (γ-Ni austenite, M23C6 and CrB) and TiC particles. Most of the TiC particles are spherical and a small fraction is blocky in size of 1 ～2μm. The TiC particles are smaller at the bottom than near the top of the coating.The coating has a gradient microstructure and a highest hardness of 1000Hv0.1.
关键词:plasma cladding; in-situ synthesis; microsttucture; composite coating; TiC particle;
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