Improving properties of h-BN/GH4169 self-lubricating composites prepared using nickel coated h-BN powders

材料科学 复合材料 润滑油 微观结构 润滑 涂层 干润滑剂 摩擦学 基质(水族馆) 烧结 冶金 海洋学 地质学
作者
Langlin Zheng,Xueping Gan,Chaoqiang Liu,Kechao Zhou
出处
期刊:Composite Interfaces [Taylor & Francis]
卷期号:30 (10): 1099-1117 被引量:3
标识
DOI:10.1080/09276440.2023.2189684
摘要

The service conditions of high temperature and heavy load of aero-engine require high-temperature self-lubricating composites with high strength, low wear and long life. Hence, the high-level objective of this study is to regulate the interface between the substrate and hexagonal boron nitride (h-BN) lubricant in GH4169 nickel-based high-temperature self-lubricating composites to improve the interfacial bonding strength and the overall performance. Electroless plating method was adopted to coat nickel on h-BN, and the dense high-temperature self-lubricating composites were fabricated through hot-pressing sintering. The effects of nickel coating on h-BN on the microstructure, mechanical properties and high-temperature tribological behaviors of composites were analyzed in detail, and the lubrication mechanism was also elucidated. The results illustrate the Ni@h-BN/GH4169 composites with addition of chemically modified lubricant particles have excellent mechanical properties and lubrication and wear reduction properties, compared to h-BN/GH4169 composites. This is mainly due to the introduction of nickel coating contributed to the distribution uniformity of h-BN in the matrix, and the wettability between h-BN and the substrate together with interfacial bonding strength were enhanced as well. This work provides an insight to overcome the challenges facing the technology when using GH4169 nickel-based self-lubricating composites in manufacturing of mechanical components in aerospace.
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