Microstructure and performance of WC-Co-Cr coating with ultrafine/nanocrystalline structures

• 作 者: Xue-Zheng Wang Hai-Bin Wang Xue-Mei Liu Chao Hou Xiao-Yan Song
• 机 构: College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Educa
• 出 处: 稀有金属（英文版）
• 发表日期: 2018年11期
• 关键词: In situ synthesis High velocity oxygen fuel Ultrafine/nanostructure Composite co

The WC-10Co-4Cr composite powder was synthesized firstly.Then the composite powder was agglomerated to prepare thermal spraying feedstock.The ultrafine/nanostructured WC-10Co-4Cr coating was pre pared by high velocity oxygen fuel thermal spraying.The phase constitution,elemental distribution and microstructure of the coating were characterized by X-ray diffraction and transmission electron microscopy,respectively.The wear resistance and corrosion resistance of the prepared composite coating were tested.The results show that the main phases of the coating include WC,binding phase with partial amorphous structure,with a little W2C and Co(Cr)coexisting.The distributions of Co and Cr elements from the phase boundary to the eutectic area then to Co zone were analyzed quantitatively.The mechanisms for the formation of the microstructure and effects of Cr on the performance of the composite coating are proposed.