TC4钛合金盐浴硼氧共渗剂的成分

发布时间：2019-04-02 02:34

【摘要】：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。
[Abstract]:Several boroxicizing agents in TC4 titanium alloy were compared and analyzed by salt bath boroximetry test. Scanning electron microscope (SEM) and energy dispersive (EDS), X-ray diffractometer (XRD),) were used to observe the surface morphology and phase of the infiltration layer, and the microhardness of the layer surface was measured by Vickers hardness tester. The friction and wear properties of YG6 ball under dry friction and wear conditions were tested and the mechanism of boro-oxygen infiltration in salt bath was analyzed by chemical thermodynamics. The results show that the effect of single borax mold (Na_2B_4O_7) infiltration is not ideal, the surface microstructure is loose, and the microhardness is 584.7 HV. The surface microstructure of borax-aluminite mould is in the form of massive and spherical particles, mainly composed of TiB_2,TiB_ (12), Ti_2B5_,Ti3Al and TiO_2 phases. The surface microhardness is increased by 71.5% (631.8HV), which has a certain effect of co-infiltration. The surface microstructure of borax-silicon carbide layer is uniform, mainly TiB_ (12), Ti_2B_5,TiB_ (25), TiO_2 and TiC phases, the surface microhardness is increased by 84.1% (677.4HV), and the effect of co-infiltration is remarkable. The surface microstructure of sodium chloride-boron oxide-carbide boronizing layer is dense and agglomerated. There are mainly TiB,TiB_2,TiB12,TiO_2 and TiC phases, the surface microhardness is increased by 80.1% (664.9HV), and the effect of co-infiltration is obvious. The wear resistance of TC4 titanium alloy can be improved by boro-oxygen co-infiltration in salt bath.
【作者单位】：江苏大学机械工程学院;江苏大学先进制造与现代装备技术工程研究院;
【基金】：科技型中小企业技术创新基金(13c26213202029) 镇江市工业科技支撑(SGY20130037) 江苏大学拔尖人才工程基金(1211110001)
【分类号】：TG174.4

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