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

doi:10.11896/cldb.22100277

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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.

Key words： nickel-graphite abradable coatings heat treatment mechanical property ultra-long time

Published: Online: 2024-06-25

CLC number:

TB332

Fund:National Natural Science Foundation of China (11772287), Major National Science and Technology Project (J2019-VI-0017-0132), National Key Research and Development Program of China (2021YFB3702304-4), and National Defense Basic Scientific Research Project (WDZC20195500501).

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	Articles by authors
	HONG Sen
	LIU Jiujun
	WANG Yuncheng
	LYU Liang
	LIAO Huanyi
	LUO Yifeng
	LUO Zhangji
	JIANG Yaonian
	MAO Weiguo

Cite this article:

HONG Sen,LIU Jiujun,WANG Yuncheng, et al. Evolution of Mechanical Properties of Nickel-graphite Abradable Coatings After Ultra-long Time Heat Treatments[J]. Materials Reports, 2024, 38(11): 22100277-4.

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http://www.mater-rep.com/EN/10.11896/cldb.22100277 OR http://www.mater-rep.com/EN/Y2024/V38/I11/22100277

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