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采用稀土-硼共渗法对TC4钛合金基体表面在1000,1050和1100℃分别保温5,10,15,20 h进行了固体粉末渗硼实验,通过扫描电镜(SEM)、能谱(EDS)分析与X射线衍射分析(XRD)研究TC4钛合金稀土-硼共渗后的组织形貌和物相组成,讨论了稀土对TC4钛合金渗硼层相组成、硬度及耐磨性的影响。结果表明,渗层由外表层的TiB2和伸向基体的齿状的TiB组成,渗层厚度最高可达25μm;XRD分析表明,TC4钛合金稀土-硼共渗后形成TiB2与TiB双相硼钛化合物层,稀土的加入使得TiB2的含量增大;EDS分析得出表层B和Ce元素含量较高,稀土促进B原子在基体表面的吸附使其浓度增大;渗层的显微硬度呈梯度分布,稀土-硼共渗渗层的TiB2到TiB晶须硬度值的变化范围为3300HV0.01~1800HV0.01;共渗渗层的耐磨性也显著提高。
The rare earth-boron co-permeation method was used to test the boronizing of solid TC4 titanium alloy substrate surface at 1000, 1050 and 1100 ℃ for 5, 10, 15 and 20 h respectively. The surface morphology of the TC4 titanium substrate was observed by SEM, EDS, The microstructure and phase composition of the TC4 titanium alloy after rare earth-boron percolation were analyzed and analyzed by X-ray diffraction (XRD). The effects of rare earth on the phase composition, hardness and wear resistance of TC4 titanium alloy were discussed. The results show that the diffusion layer consists of TiB2 in the outer layer and dentate TiB in the matrix, and the thickness of the diffusion layer is up to 25μm. The XRD results show that the formation of TiB2 and TiB biphasic boron-titanium compounds The content of B and Ce in the surface layer was higher by EDS analysis, and the adsorption of B atoms on the surface of the substrate by rare earth promoted the concentration of TiB2. The microhardness of the layer was gradient distribution, The hardness range of TiB2 to TiB whisker in rare earth-boron co-infiltrated layer varies from 3300 HV0.01 to 1800 HV0.01. The wear resistance of the infiltrated layer is also significantly improved.