| 摘要: |
| 为了改善γ-TiAl合金摩擦学性能不理想的问题，采用双辉等离子表面合金化技术在γ-TiAl合金表面制备了TiC渗镀层，并使用扫描电子显微镜（SEM）、辉光放电光谱成分分析仪（GDOES）和X射线衍射仪（XRD）对TiC渗镀层的形貌、化学成分和物相结构进行分析，借助显微硬度计、划痕仪和往复摩擦磨损试验机对渗镀层的表面硬度、结合强度和摩擦磨损性能进行研究。结果表明：在γ-TiAl合金表面形成了纳米结构的TiC渗镀层，其中，沉积层厚约7 μm，扩散层厚约15 μm。渗镀层硬度比基体显著提高，达到2200 HV0.2。渗镀层的摩擦因数和比磨损率都比基体大幅降低，摩擦因数从基体的0.7下降为0.37，比磨损率仅为基体的6.5%，表明制备的TiC渗镀层有效提高了γ-TiAl合金的耐磨性能。 |
| 关键词: γ-TiAl合金 等离子表面合金化技术 TiC渗镀层 摩擦磨损 |
| DOI：10.11933/j.issn.1007-9289.20180605001 |
| 分类号:TG174.445;TG115.58 |
| 基金项目:国家自然科学基金（51601124，51505318）；山西省应用基础研究计划面上青年基金（201601D202026） |
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| Wear Properties of TiC Permeation Layer Prepared on γ-TiAl Alloy |
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WANG Hongkong, ZHENG Ke, GAO Jie, YU Shengwang, HEI Hongjun, HE Zhiyong
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College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
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| Abstract: |
| To improve the tribological properties of γ-TiAl alloy, a TiC permeation layer on the surface of the γ-TiAl alloy was prepared by double glow plasma surface alloying technique. The microstructure, composition and phase structure of the TiC permeation layer were characterized by scanning electron microscopy (SEM), glow discharge optical emission spectrometer (GDOES) and X-ray diffration (XRD). The surface hardness, adhesion strength and tribological properties of the TiC permeation layer were investigated by using a microhardness tester, a scratch tester and reciprocating friction and a wear tester, respectively. The results show that the TiC permeation layer with nanostructure includes a deposition layer of 7 μm and a diffusion layer of 15 μm. After treatment, the surface hardness of the γ-TiAl alloy is significantly improved, reaching at 2200 HV0.2. Compared with the substrate, the TiC permeation layer has a relatively low friction coefficient and a very low specific wear rate. The friction coefficient decreases from 0.7 of the substrate to 0.37 of the permeation layer. Specifically, the specific wear rate of the permeation layer is only 6.5% of the substrate. Therefore, the TiC permeation layer can effectively enhance the wear resistance of the γ-TiAl alloy. |
| Key words: γ-TiAl alloy double glow plasma surface alloying technique TiC permeation layer friction and wear |
