Evolution of Mechanical Properties of Nickel-graphite Abradable Coatings After Ultra-long Time Heat Treatments
HONG Sen1, LIU Jiujun1, WANG Yuncheng2, LYU Liang2, LIAO Huanyi3, LUO Yifeng3, LUO Zhangji3, JIANG Yaonian3, MAO Weiguo1,3,*
1 School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, Hunan, China 2 Aecc South Industry Company Limited, Zhuzhou 412000, Hunan, China 3 School of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410014, China
Abstract: The reliability and durability of nickel-graphite abradable coatings under long service time are important to effectively maintain and improve engine efficiency. Nickel-graphite coatings were prepared by thermal spraying technology. The corresponding mechanical properties were investigated after heat-treatments at 200 ℃, 300 ℃, 400 ℃ for 400 h, 800 h, 1 200 h, 1 600 h, 2 000 h, respectively. The results showed that the heat treatment time and temperature have a great influence on the properties evolution of the coatings. As the heat treatment time increased, the hardness increased and then decreased. After heat treatment at 400 ℃ for 2 000 h, the surface and cross-sectional hardness of the coatings reached the minimum values of 0.46 GPa and 0.63 GPa, respectively. The cohesive strength between the coating and substrate strongly varied with heat treatment time. After heat treatment at 400 ℃ for 2 000 h, the cohesive strength become 0.43 MPa. The combined effects of nickel and graphite, grain growth and residual stress on the mechanical properties of nickel graphite coatings during heat treatments were discussed in detail.
洪森, 刘九军, 汪云程, 吕亮, 廖桓毅, 罗屹峰, 罗张吉, 蒋耀年, 毛卫国. 超长时间热处理后镍-石墨封严涂层力学性能演变特性分析[J]. 材料导报, 2024, 38(11): 22100277-4.
HONG Sen, LIU Jiujun, WANG Yuncheng, LYU Liang, LIAO Huanyi, LUO Yifeng, LUO Zhangji, JIANG Yaonian, MAO Weiguo. Evolution of Mechanical Properties of Nickel-graphite Abradable Coatings After Ultra-long Time Heat Treatments. Materials Reports, 2024, 38(11): 22100277-4.
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2024, Vol. 38 
