摘要
本论文利用直流电弧等离子体法,在氢气与氮气混合气氛中蒸发块体Ti金属,制备TiN单晶纳米颗粒,利用X射线衍射仪(XRD)和透射电子显微镜镜(TEM)对纳米颗粒进行成分及结构进行表征并分析颗粒的热稳定性。直流电弧等离子体法制备的TiN纳米颗粒具有立方晶体结构,在774 K时,TiN纳米颗粒达到氧化峰值。
利用电刷镀方法制备出TiN纳米颗粒镶嵌Ni-P／TiN纳米复合镀层。通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)对复合镀层进行物相结构、表面形貌、微观组织分析,并对纳米复合镀层显微硬度和耐磨性能进行测试。Ni-P／TiN纳米复合镀层显微硬度高达Ni-P镀层的近3倍,耐磨性也有显著提高。
制备α-Al2O3纳米颗粒镶嵌Ni-P／Al2O3纳米复合镀层。对比普通Ni-P镀层,对Ni-P／Al2O3纳米复合镀层进行200℃,400℃和600℃真空热处理1 h,得到晶化纳米复合镀层。通过Ni-P／Al2O3纳米复合镀层物相结构、表面形貌、微观组织分析,及其力学性能测试,研究热处理温度对纳米复合镀层组织结构和性能的影响。400℃热处理后的Ni-P／Al2O3纳米复合镀层已经完成晶化,综合力学性能也最优。
TiN monocrystal nanoparticles had been prepared by a DC arc discharge method in a mixture atmosphere of hydrogen and nitrogen. The crystal structure and microstructures were studied by means of XRD and TEM. The oxidability of nanoparticles was studied by TGA-DTA. It was indicated that the TiN nanoparticles were monocrystal. At 774 K, TiN nanoparticles were oxidated.
TiN nanoparticles embedded Ni-P/TiN nano-composite coating were prepared by electro-brush plating. The morphology and microstructures were studied by means of XRD and SEM. The micro-hardness and tribological properties of the nano-composite coatings were also investigated. Ni-P/TiN nano-composite coating had about 3 times higher micro-hardness than Ni-P coating and its wear resistance was also improved.
α-Al2O3 nanoparticles embedded Ni-P/Al2O3 nano-composite coating were also prepared and tested by the same method. Compared with Ni-P coating, Ni-P/Al2O3 nano-composite coating was annealed at 200℃,400℃, and 600℃in vacuum for 1 h. The effect of the temperature was studied. The composite coating has been crystallized at 400℃. Ni-P/Al2O3 nano-composite coating annealed at 400℃had the best mechanical properties.
引文
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