Tribological Behavior of TiAl-Multilayer Graphene-Ag Composites at Different Temperatures and Sliding Speeds

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2017,（3）
• 页码范围: 193-200
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s40195-017-0533-3

摘要

Tribological behavior of TiAl-multilayer graphene-Ag composites (TMACs) prepared by spark plasma sintering against a Si3N4 ball was investigated on a ball-on-disk high-temperature tribometer at different test temperatures and sliding speeds in this study.The test results showed that TMACs had the lower friction coefficient and less wear rate at 450 ℃-0.25 m/s,which was attributed to the formation of the high-strength and intact tribofilms on worn surface.At 450 ℃-0.25 m/s,during the sliding process,multilayer graphene (MLG) was ground out to form the high-strength skeletons on the worn surface of TMACs.Ag was migrated from the worn surface and combined with the MLG skeleton to form the high-strength and intact tribofilms.The high-strength and intact tribofilms were beneficial to lowering the friction coefficient for the lubricating effect of Ag and decreasing wear rate for the enhancing effect of MLG skeleton.