激光熔化沉积NiTi/Ni3Ti金属间化合物合金的显微组织和耐磨性

来源期刊:中国有色金属学报2006年第5期

论文作者:李昂 李安 张凌云 王华明

文章页码:867 - 873

关键词:激光熔化沉积; NiTi; Ni3Ti; 磨损; 显微组织

Key words:laser melting deposition; NiTi/Ni3Ti; wear; microstructure

摘    要:利用激光熔化沉积技术制备出分别以NiTi和Ni3Ti为初生相的NiTi/Ni3Ti金属间化合物耐磨合金, 采用XRD、 OM、 SEM、 EDS等手段分析合金的组织, 测试合金的室温干滑动磨损性能。 结果表明, 其室温干滑动磨损机制为软磨料磨损和氧化磨损; 对于以Ni3Ti为初生相的合金, 其室温干滑动磨损机制在中低负荷下为氧化磨损和显微切削, 在高负荷下则是Ni3Ti的显微切削; 以NiTi为初生相的NiTi/Ni3Ti金属间化合物合金具有更好的抗室温摩擦磨损性能。

Abstract: The wear-resistant NiTi/Ni3Ti intermetallic alloys were designed and fabricated by the laser melting deposition process. The as-solidified microstructures of the NiTi/Ni3Ti intermetallic alloys were characterized by X-ray diffraction(XRD), optical microscope(OM), scanning electron microscope(SEM) and energy dispersive spectrometer(EDS). The wear resistance of the alloys was evaluated under room-temperature dry sliding wear test condition coupling with hardened bearing steel GCr15. The results indicate that the room temperature dry-sliding wear mechanism of the NiTi/Ni3Ti intermetallic alloy with NiTi dendrite as the primary phase is soft abrasion and oxidative wear, while that of the NiTi/Ni3Ti intermetallic alloy with Ni3Ti as the primary phase is oxidative wear and micro-cutting under low/medium normal load, and micro-cutting is under high normal load; the NiTi/Ni3Ti intermetallic alloy with NiTi dendrite as the primary phase has better wear resistance under dry sliding wear test conditions than that with Ni3Ti as the primary phase.

基金信息:国家自然科学基金重点资助项目

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