金属热处理 ›› 2023, Vol. 48 ›› Issue (2): 284-288.DOI: 10.13251/j.issn.0254-6051.2023.02.044

• 表面工程 • 上一篇    下一篇

交流电场对工业纯钛TA2粉末法渗氧的影响

王鑫宇1, 谢飞1,2, 潘建伟3   

  1. 1.常州大学 材料科学与工程学院, 江苏 常州 213164;
    2.常州大学 江苏省材料表面技术重点实验室, 江苏 常州 213164;
    3.常州大学 怀德学院, 江苏 靖江 214500
  • 收稿日期:2022-09-27 修回日期:2023-01-01 出版日期:2023-02-25 发布日期:2023-03-22
  • 通讯作者: 谢 飞,教授,博士,E-mail:xiefei@cczu.edu.cn
  • 作者简介:王鑫宇(1997—),男,硕士研究生,主要研究方向为材料表面工程,E-mail:894128757@qq.com。
  • 基金资助:
    国家自然科学基金(51171032)

Effect of alternating current field on powder oxidizing of commercially pure titanium TA2

Wang Xinyu1, Xie Fei1,2, Pan Jianwei3   

  1. 1. School of Materials Science and Engineering, Changzhou University, Changzhou Jiangsu 213164, China;
    2. Key Laboratory of Materials Surface Engineering of Jiangsu Province, Changzhou University, Changzhou Jiangsu 213164, China;
    3. Huaide College, Changzhou University, Jingjiang Jiangsu 214500, China
  • Received:2022-09-27 Revised:2023-01-01 Online:2023-02-25 Published:2023-03-22

摘要: 在650 ℃进行工业纯钛TA2的粉末法渗氧,通过渗罐内一组平行电极,对渗剂和TA2试样施加交流电场,进行交流电场增强粉末法渗氧。研究发现,以尿素作为供氧剂的粉末法渗氧生成的渗层表层主要由TiO2组成,还有少量Ti2N和固溶氧的α-Ti;交流电场能够大幅度提高纯钛的渗氧效率,随电场电流增加,渗层厚度、硬度增加,沿层深硬度分布改善;在电场电流为2 A和渗剂含2%尿素时,6 h渗扩所得渗层厚度约46 μm,渗层峰值硬度约1150 HV0.01。交流电场的物理作用能够强化渗氧剂中的反应,从而增加氧原子及含氧活性基团的产率和活性;交流电场通过提高试样内部的空位浓度,为氧原子的扩散提供更多通道;这两个因素加快氧向试样内部扩散。这种新技术可以在较低温度对钛进行高效渗氧处理,减少工件畸变。

关键词: 工业纯钛TA2, 粉末法渗氧, 交流电场, 表面改性

Abstract: Alternating current field (ACF) enhanced powder oxidizing was carried out on commercially pure titanium TA2 at 650 ℃ by applying ACF to pack agents and specimen with a pair of electrodes paralleling with each other set in a process container. The results show that the surface layer, produced by the oxidizing with carbamide as oxygen supplier in the pack agent, consists of mainly TiO2 with few Ti2N and α-Ti with dissolved oxygen. ACF can greatly enhance the oxidizing of TA2. The oxidized layer thickness and hardness increase with the increase of ACF current, which modifies the hardness distribution along the layer depth. After oxidizing for 6 h with pack agent containing 2% carbamide and the ACF with a current of 2 A, an oxidized layer is obtained with thickness of 46 μm and peak hardness of 1150 HV0.01. It is proposed that the ACF's physical effect of enhancing chemical reactions in the agent increases the productivity and activity of oxygen atoms or active oxygen-containing species. By increasing the vacancy concentration in the specimen, the ACF provides more channels for the diffusion of oxygen atoms. These two factors accelerate the diffusion of oxygen atoms into the specimen. This new oxidizing technology can carry out high-efficient oxygen infiltration treatment on titanium at a lower temperature and reduce workpiece distortion.

Key words: commercially pure titanium TA2, powder oxidizing, alternating current field, surface modification

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