| 摘要: |
| 在渗硼剂中添加质量分数为 1%、2%、3%和 4%的 CeO2 ,在烧结温度为 1050 ℃情况下对铁基粉末冶金材料渗硼处理 5 h,制备出具有渗硼层的铁基粉末冶金试样。 从渗硼层厚度、微观组织结构、表面粗糙度和摩擦磨损性能等方面研究渗硼剂中 CeO2 的添加量对渗硼层性能的影响。 结果表明:随 CeO2 含量增加,试样表面粗糙度逐渐增大,渗硼层厚度一开始增大而后显著减小。 与不添加 CeO2 相比,添加 2% CeO2 试样的渗硼层厚度增加了 31%,表面组织更加致密均匀,磨损轨迹未损坏,磨损量低于其他试样;添加 4% CeO2 试样的渗硼层厚度减小了 82. 6%,表面组织出现大量孔洞及裂纹,磨损轨迹破坏严重,磨损量高于其他试样。 说明过量的 CeO2抑制渗硼作用,添加 2% CeO2 试样的渗硼层具有更加优良的抗磨损性能。 |
| 关键词: 固体渗硼 稀土 铁基粉末冶金 表面粗糙度 耐磨性 |
| DOI：10.11933/j.issn.1007-9289.20200317002 |
| 分类号:TG174.445 |
| 文章编号:1007-9289(2020)05-0056-09 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51575269)； 安徽省自然科学基金(KJ2017ZD50)； 安徽高校优秀青年人才支持计划(gxyq2019186) |
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| Effects of Rare Earth on Boriding Strengthening Property of Iron-based Powder Metallurgy Materials |
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Fang Huimin1,2, Zhang Guangsheng1,3, Xia Liansen3
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1.Insititute of Mechanical Engineering, Anhui Technical College of Mechanical and Electrical Engineering, Wuhu 241000 , China;2.Electromechanical Institute, Nan Jing University of Aeronautics and Astronautics, Nanjing 210016 , China;3.School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu 241006 , China
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| Abstract: |
| Iron-based powder metallurgy specimens with boride layer was prepared by boriding at 1050 ℃ for 5 h. Adding 1%, 2%, 3% and 4% CeO2 to the boriding agent was conducted to prepare an enhanced boride layer. The thickness, micro- structure, surface roughness and friction and wear performance were studied to evaluate the effects of CeO2 on the properties of the boride layer. Results shows that the surface roughness gradually increased with the increase of CeO2 content, and the thick- ness of the boride layer increased at first and then decreased significantly. Compared with no CeO2 added, the thickness of the boride layer with 2% CeO2 specimen is increased by 31%, the surface structure is more denser and uniform, the wear track is not damaged, and the amount of wear is lower than other specimens. While the thickness of the boride layer with 4% CeO2 speci- men is reduced by 82. 6%, many defects appeared in the surface structure, the wear track was seriously damaged, and the wear amount was higher than other specimens, indicating that excessive CeO2 inhibits the boriding processing, specimen boriding with 2% CeO2 behave excellent friction and wear performance. |
| Key words: pack boriding rare earths Fe-based powder metallurgy surface roughness wear resistance |
