稀土对TC4钛合金固体渗硼的影响研究  

Effects of Rare Earth on Boronizing of TC4 Titanium Alloy

作　　者：衣晓红[1] 樊占国[1] 张景垒[1] 李凤华[1] 奚正平[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]西北有色金属研究院金属多孔材料国家重点实验室,陕西西安710016

出　　处：《中国稀土学报》2010年第5期607-611,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家高技术研究发展计划资助项目(2006AA06Z368);辽宁省高校重点实验室基金项目(20061003)资助

摘　　要：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 pack RE-boronizing experiments were carried out on TC4 titanium alloy surface at 1000,1050 and 1100 ℃ for 5,10,15,20 h,respectively.By means of XRD,SEM and EDS,the phase composition,microstructure and morphology of TC4 titanium alloy after RE-boronizing were investigated.The effect of rare earth on phase composition,microhardness and wear resistance was discussed.The results showed that the diffusion layer was composed of top-layer TiB2 and sub-layer TiB toothed with the largest thickness of about 25 μm.Adding RE in the agent could increase the TiB2 content in the treated layer,and promote the absorption and concentration of B atoms on the substrate surface and significantly improve microhardness and wear resistance.The results showed that the microhardness of diffusion layer was gradient distribution from 3300HV0.01 to 1800HV0.01.

关 键 词：稀土-硼共渗 TC4钛合金 稀土催渗 显微硬度 耐磨性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]