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采用新型机械合金化-放电等离子烧结(MA-SPS)技术制备纳米结构Cu/C自润滑复合材料。利用XRD、DSC、TEM分析机械合金化粉末和SPS烧结样品的相组成和微观结构。结果表明,球磨24h后,Cu-C不互溶体系形成了纳米晶铜、非晶碳和纳米结构过饱和固溶体等亚稳相。SPS烧结后,Cu/C复合材料仍保持纳米结构。MA-SPS的双重活化机制,使粉末的烧结活性大大提高,在600℃烧结3min即可获得致密的纳米结构Cu/C复合材料。
Nanostructured Cu / C self-lubricating nanocomposites were prepared by a novel mechanical alloying-discharge plasma sintering (MA-SPS) technique. The phase composition and microstructure of mechanical alloying powder and SPS sintered samples were analyzed by XRD, DSC and TEM. The results show that the metastable phases such as nanocrystalline copper, amorphous carbon and nanostructured supersaturated solid solution form after Cu-C immiscible system for 24 h. After SPS sintering, the Cu / C composite retains the nanostructures. MA-SPS dual activation mechanism, the sintering activity of the powder greatly improved, sintered at 600 ℃ for 3min to obtain dense nanostructured Cu / C composite material.