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以渗层厚度和表面硬度为评定依据,采用正交试验对TC4钛合金表面氧化镧催渗渗硼工艺进行优化。结果表明,渗硼温度对渗硼层影响最大,其次为渗硼时间、B4C含量和La2O3含量。最优的催渗渗硼工艺为:渗硼温度1050℃,渗硼时间20 h,渗硼剂配比20wt%B4C+4wt%La2O3+76wt%SiC。渗层表面由TiB、Ti2B5、TiC和Ti组成;与未添加氧化镧渗硼层相比,添加氧化镧渗硼层厚度与表面硬度明显提高,耐磨性也得到显著改善。
Based on the evaluation of coating thickness and surface hardness, the orthogonal experiment was used to optimize the boronizing process of lanthanum oxide on TC4 titanium alloy. The results show that boronizing temperature has the strongest influence on boronizing layer, followed by boronizing time, B4C content and La2O3 content. The optimum process of infiltration and boronizing is boronizing temperature 1050 ℃, boronizing time 20 h, boronizing agent ratio 20wt% B4C + 4wt% La2O3 + 76wt% SiC. The surface of the infiltrated layer is composed of TiB, Ti2B5, TiC and Ti. The thickness and surface hardness of boride doped with lanthanum are obviously improved and the wear resistance is also improved obviously compared with that without boron oxide.