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通过对TC4钛合金进行盐浴硼氧共渗试验,比较分析几种盐浴硼氧共渗剂。采用扫描电子显微镜(SEM)及其配备的能谱仪(EDS),X射线衍射仪(XRD),观察渗层表面形貌和物相,用维氏硬度计测量渗层表面显微硬度,测试与YG6球在干摩擦磨损条件下的摩擦磨损性能,并采用化学热力学分析盐浴硼氧共渗机理。结果表明单一硼砂型(Na_2B_4O_7)共渗效果不理想,表面组织疏松,显微硬度为584.7HV;硼砂—铝粉型渗层表面组织呈块状和球形颗粒状,主要由TiB_2、TiB_(12)、Ti_2B5_、Ti3Al和TiO_2相组成,表面显微硬度提高了71.5%(631.8HV),有一定的共渗效果;硼砂—碳化硅型渗层表面组织均匀,主要有TiB_(12)、Ti_2B_5、TiB_(25)、TiO_2和TiC相,表面显微硬度提高了84.1%(677.4HV),共渗效果显著;氯化钠—氧化硼—碳化硼型渗层表面组织致密,有团聚现象,主要有TiB、TiB_2、TiB12、TiO_2和TiC相,表面显微硬度提高了80.1%(664.9HV),共渗效果明显。组分盐浴硼氧共渗可以显著改善TC4钛合金的耐磨性能。
By TCT titanium alloy salt bath boron oxygen permeability test, comparative analysis of several salt bath borosilicate penetrant. Scanning electron microscopy (SEM) and its equipped with EDS and XRD were used to observe the surface morphology and phase of the layer. The microhardness of the layer was measured by Vickers hardness tester. And YG6 ball under dry friction and wear conditions, and chemical thermodynamic analysis of salt bath boron oxide permeation mechanism. The results show that the effect of single borax (Na_2B_4O_7) co-permeation is not satisfactory, the surface structure is loose and the microhardness is 584.7HV. The surface structure of borax-aluminum powder infiltrated layer is massive and spherical, mainly composed of TiB_2, TiB_ (12) , Ti_2B5_, Ti3Al and TiO_2 phase, the surface microhardness increased by 71.5% (631.8HV), with a certain effect of osmosis; the surface structure of borax - silicon carbide type diffusion layer is uniform, mainly including TiB12, Ti_2B_5, TiB_5, (25), TiO 2 and TiC phase, the microhardness of the surface increased 84.1% (677.4HV), and the effect of co-infiltration was remarkable. The surface structure of sodium chloride-boron oxide-boron carbide type diffusion layer was dense with agglomeration, , TiB_2, TiB12, TiO_2 and TiC phase, the surface microhardness increased by 80.1% (664.9HV), and the effect of osmosis was obvious. Salt bath boron oxide composition can significantly improve the wear resistance of TC4 titanium alloy.