| 引用本文: | 张锋刚， 朱小鹏， 雷明凯.强流脉冲离子束辐照WC-Ni硬质合金的摩擦磨损性能[J].中国表面工程,2016,29(1):96~102 |
| ZHANG Fenggang, ZHU Xiaopeng, LEI Mingkai.Tribological Properties of WC-Ni Cemented Carbide Irradiated by High Intensity Pulsed Ion Beam[J].China Surface Engineering,2016,29(1):96~102 |
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| 摘要: |
| 为进一步提高WCNi硬质合金的表面耐磨性，采用强流脉冲离子束（HIPIB）对其表面进行辐照处理。利用扫描电子显微镜、显微硬度计和环块式摩擦磨损试验机研究了HIPIB辐照WCNi硬质合金的微观组织、硬度分布和摩擦磨损性能。结果表明：HIPIB辐照WCNi硬质合金表面发生快速重熔与烧蚀，组织显著细化、致密化；随着束流密度和辐照次数的增加，熔层厚度与硬化层深度增加、摩擦因数和磨损率降低，束流密度300 A/cm2辐照10次，熔层厚度约4 μm，硬化层深度可达160 μm，摩擦因数和磨损率分别降低45%和70%。辐照硬质合金表面重熔层的磨损主要表现为以均匀微观切削为主的磨粒磨损，近表层冲击硬化区的磨损仍以Ni粘结相的微观磨损和WC晶粒脱落为主，但辐照应力波的长程硬化作用使硬质合金中WC晶粒与Ni粘结相之间的结合力增强以及Ni粘结相自身强化有效抑制了这类磨损。 |
| 关键词: 强流脉冲离子束(HIPIB) WCNi硬质合金 摩擦因数 耐磨性 |
| DOI：10.11933/j.issn.1007-9289.2016.01.014 |
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| Tribological Properties of WC-Ni Cemented Carbide Irradiated by High Intensity Pulsed Ion Beam |
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ZHANG Fenggang, ZHU Xiaopeng, LEI Mingkai1,2
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1. School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723001, Shaanxi;2. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning
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| Abstract: |
| WC-Ni cemented carbide surface was irradiated by highintensity pulsed ion beam (HIPIB) to enhance its wear resistance in this research.The microstructure, microhardnessdepth profile and tribological properties of HIPIB irradiated WCNi cemented carbide were investigated by using SEM, microhardness tester and blockonring wear tester, respectively. The results show that HIPIB irradiation induces the surface remelting and ablation, and its microstructure is significantly refined and densified. With increasing ion current density and shot number, the depth of the remelting layer and hardening layer increase, friction coefficient and wear rate decrease. The depth of the remelting layer and hardening layer for 300 A/cm2 with 10 shots reaches 4 μm and 160 μm, and the friction coefficient and wear rate are reduced by 45% and 70%, respectively. The wear of the surface remelting layer on the irradiated samples is microabrasion, and the wear of impact hardening zone on the subsurface layer involves microabrasion of Ni binder phase and subsequent pullout of WC grains; however, it is significantly suppressed by combined enhancements in the bonding force between WC grains and Ni binder phase, and strengthening of binder phase itself by the hardened effect in the long range from stress wave of HIPIB irradiation. |
| Key words: high-intensity pulsed ion beam（HIPIB） WCNi cemented carbide friction coefficient wear resistance |
