Enhancing gamma irradiation resistance by a‐C film treatment on polytetrafluoroethylene (PTFE) surface

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-01-10 DOI:10.1002/sia.7285

Liqiang Chai, Pengxiang Ma, Chengyan Jiang, L. Qiao, Peng Wang

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引用次数: 0

Abstract

Polytetrafluoroethylene (PTFE) solid self‐lubricating materials exhibit inferior tribological properties in the gamma‐irradiated environment. In this paper, amorphous hydrogen‐free carbon (a‐C) film was deposited on the PTFE polymer surface by magnetron sputtering, and the a‐C/PTFE samples were irradiated with gamma ray at a maximum dose of up to 5 MGy. The evolution of the structure and nanomechanical and tribological properties of a‐C/PTFE with different irradiation doses were investigated. The structural analyses reveal that the microstructure of a‐C films irradiated at 5 MGy doses is stable. Due to the covering of the a‐C film, significant cracks appear at the surface of the a‐C/PTFE sample only when the irradiation dose reaches 5 MGy. Before and after irradiation, the nanohardness and Young's modulus of the a‐C/PTFE are significantly higher than those of PTFE. The mechanical properties of PTFE are improved by a‐C film surface treatment. The friction experiments show that the average friction coefficients of both a‐C/PTFE and PTFE remain stable around 0.175 with increasing irradiation dose. When the irradiation dose is within 1 MGy, frictional behaviors occur only on the surface of a‐C films, and the wear rate of a‐C/PTFE is as low as 9.3 × 10−5 mm3/N.m, which is significantly lower than that of PTFE. The method of a‐C film treatment on the PTFE surface can dramatically improve the irradiation resistance of PTFE.

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通过对聚四氟乙烯（PTFE）表面进行 A-C 薄膜处理增强其抗伽马辐照性能

聚四氟乙烯（PTFE）固体自润滑材料在伽马射线辐照环境下的摩擦学性能较差。本文采用磁控溅射法在聚四氟乙烯聚合物表面沉积无定形无氢碳（a-C）薄膜，然后用最大剂量为 5 MGy 的伽马射线辐照 a-C/PTFE 样品。研究了不同辐照剂量下 a-C/PTFE 的结构演变、纳米力学性能和摩擦学性能。结构分析表明，在 5 MGy 剂量下辐照的 a-C 薄膜的微观结构是稳定的。由于 a-C 薄膜的覆盖作用，只有当辐照剂量达到 5 MGy 时，a-C/PTFE 样品的表面才会出现明显的裂纹。在辐照前后，a-C/PTFE 的纳米硬度和杨氏模量都明显高于 PTFE。a-C 薄膜表面处理改善了 PTFE 的机械性能。摩擦实验表明，随着辐照剂量的增加，a-C/PTFE 和 PTFE 的平均摩擦系数稳定在 0.175 左右。当辐照剂量在 1 MGy 以内时，摩擦行为只发生在 a-C 薄膜表面，a-C/PTFE 的磨损率低至 9.3 × 10-5 mm3/N.m，明显低于 PTFE。在聚四氟乙烯表面处理 a-C 薄膜的方法可以显著提高聚四氟乙烯的抗辐照性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.