| ZHOU Xiao-hui,SUN Li-li,JIANG Xian-chun,CUI Li,WANG Ai-ying,CUI Ping,KE Pei-ling.Comparison of Tribological Behavior of Polyetheretherketone Matched with Different Hard Coatings[J],52(6):246-255, 360 |
| Comparison of Tribological Behavior of Polyetheretherketone Matched with Different Hard Coatings |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.06.021 |
| KeyWord:hard coating amorphous carbon graphite structure polyetheretherketone wear crystallinity |
| Author | Institution |
| ZHOU Xiao-hui |
Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo , China;School of Physical Science and Technology, Shanghai Tech University, Shanghai , China |
| SUN Li-li |
Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo , China |
| JIANG Xian-chun |
Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo , China |
| CUI Li |
Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo , China |
| WANG Ai-ying |
Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo , China;University of Chinese Academy of Sciences, Beijing , China |
| CUI Ping |
School of Physical Science and Technology, Shanghai Tech University, Shanghai , China;University of Chinese Academy of Sciences, Beijing , China |
| KE Pei-ling |
Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo , China;University of Chinese Academy of Sciences, Beijing , China |
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| Abstract: |
| The surface coating technology can improve the friction and wear behavior of the substrate while maintaining its excellent mechanical properties. CrN coating as the representative of hard coating materials with high hardness can effectively resist impact and abrasive wear, and is often used in mechanical bearing shaft, piston pin and other friction protection. Diamond like carbon (DLC) coating is a kind of metastable material formed by the sp2 and sp3 hybrid of carbon, which has high hardness, wear resistance, chemical inertia and other properties. In particular, graphite-like carbon (GLC) coating, which is dominated by graphite-phase sp2 hybrid bond content, shows better adaptability to multiple environments. In order to carry out the technical optimization of polyetheretherketone (PEEK) matching materials, and solve the problem of easy wear of PEEK material of PEEK-stainless steel friction system, the work aims to compare and investigate the tribological behavior of PEEK matched with stainless steel, CrN and Cr/GLC coatings. CrN and Cr/GLC multi-layer coatings were prepared on 17-4PH stainless steel substrate (the size was ϕ17 mm ×3 mm) by multi-target magnetron sputtering deposition system. The coating thickness was about 1.8 μm and 2 μm, respectively. The friction testing machine was used to test the relationship between COF and time. The matching pair was PEEK ball with a diameter of 6 mm. The coating wear rate was calculated by 3D profilometer. The wear volume of three kinds of matching PEEK balls was calculated according to the volume of the crown. The physical and chemical states of the coatings were characterized by SEM, Raman and FTIR, etc., and the wear mechanism between the coatings and PEEK was analyzed. The results showed that both CrN and Cr/GLC multi-layer coatings could improve the friction properties when they were matched with PEEK. Compared with stainless steel, the COF of CrN and Cr/GLC coatings reduced significantly. The wear rate of CrN coating and Cr/GLC coating decreased 93.1% and 97.4%. The wear volume for counterpart PEEK decreased by 35.1% and 65.8%, respectively. The aromatic ring opening, replacement, cross-linking, and loss of crystallinity occurred in PEEK surface during sliding process, and the crystallinity was as follows:unworn PEEK > PEEK grinding with Cr/GLC > PEEK grinding with CrN > PEEK grinding with 17-4. When PEEK was against 17-4 PH stainless steel, the micro-convex of the substrate spalled and hard particles were formed, resulting in abrasive wear. Part of the PEEK transferred to the substrate surface and another part of the formation of wear debris piled up on the edge of the grinding crack, caused by wear sharp PEEK surface crystallinity slash and mechanics performance, eventually leading to the decrease of the material abrasion resistance. When PEEK is matched with CrN coating, because the CrN coating surface is rough and lack of lubrication, it can plough the PEEK surface, which makes the adhesive wear more significant. A large amount of PEEK material transfer occurs and the transfer material can reduce PEEK wear and prevent the decrease of crystallinity. When PEEK is matched with Cr/GLC coating, it is attributed to the good crystallinity stability of PEEK and excellent lubrication of graphite structure in Cr/GLC multi-layer coating. |
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