欧阳杏,张帆,肖雨生,覃冬,龚适,汤召华,魏仁兵,蔡振兵.γ射线辐照对PA66结构和摩擦学性能的影响[J].表面技术,2024,53(19):50-60.
OUYANG Xing,ZHANG Fan,XIAO Yusheng,QIN Dong,GONG Shi,TANG Zhaohua,WEI Renbing,CAI Zhenbing.Effects of γ-ray Irradiation on Structure and Tribological Properties of PA66[J].Surface Technology,2024,53(19):50-60 |
| γ射线辐照对PA66结构和摩擦学性能的影响 |
| Effects of γ-ray Irradiation on Structure and Tribological Properties of PA66 |
| 投稿时间：2023-10-25 修订日期：2024-01-10 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.19.005 |
| 中文关键词: PA66 γ射线辐照 分子结构 摩擦磨损 |
| 英文关键词:PA66 γ-ray irradiation molecular structure friction and wear |
| 基金项目:国家重点研发计划(2022YFB3401901);国家自然科学基金重点项目(U2067221);四川省科技计划(2022JDJQ0019，2022ZYD0029) |
| 作者 | 单位 |
| 欧阳杏 | 西南交通大学 摩擦学研究所，成都 610031 |
| 张帆 | 东方电气集团科学技术研究院有限公司，成都 611731 |
| 肖雨生 | 西南交通大学 摩擦学研究所，成都 610031 |
| 覃冬 | 西南交通大学附属医院 成都市第三人民医院眼科，成都 610031 |
| 龚适 | 西南交通大学 摩擦学研究所，成都 610031 |
| 汤召华 | 四川金核高分子材料有限公司，四川 眉山 620866 |
| 魏仁兵 | 西南交通大学 摩擦学研究所，成都 610031 |
| 蔡振兵 | 西南交通大学 摩擦学研究所，成都 610031 |
|
| Author | Institution |
| OUYANG Xing | Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China |
| ZHANG Fan | DEC Academy of Science and Technology Co., Ltd., Chengdu 611731, China |
| XIAO Yusheng | Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China |
| QIN Dong | Department of Ophthalmology, The Third People's Hospital of Chengdu City, The Affiliated Hospital of Southwest Jiaotong University, Chengdu 610031, China |
| GONG Shi | Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China |
| TANG Zhaohua | Sichuan Golden Nuclear Polymer Material Co., Ltd., Sichuan Meishan 620866, China |
| WEI Renbing | Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China |
| CAI Zhenbing | Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China |
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| 中文摘要: |
| 目的 研究辐照后PA66的分子结构和摩擦学性能变化情况，以及两者之间的联系。方法 采用凝胶含量测试、红外光谱测试、XPS测试分析、DSC测试分析等方法研究辐照前后PA66的分子结构变化情况，将辐照前后各剂量PA66以球-平面形式进行往复式摩擦磨损试验，对摩擦因数、磨损率及磨痕形貌进行分析，以研究辐照对PA66摩擦学性能的影响。结果 随着辐照剂量的增加，PA66凝胶的质量分数从1.31%增加到60.77%，辐照导致PA66表面含氧官能团含量增加，且在1 000 kGy剂量下生成了羟基，同时材料结晶度整体随辐照剂量的增加而降低。经辐照后，PA66的摩擦因数从0.49逐渐增至0.615，磨损率从179.3× 103 μm3/(N.m)大幅增至2 511.7×103 μm3/(N.m)。磨痕中央和边缘的磨损形式的变化趋势不同，磨痕中央始终为黏着形貌，磨痕边缘在剂量增大后从黏着形貌变化为沟壑状形貌。结论 PA66在γ射线辐照影响下主要发生分子链间的交联和表面氧化，分子间的交联和辐照破坏了材料内晶体的结构，导致材料的结晶度下降。同时，PA66交联使对磨副运动时剥落表面材料受到更大的阻力，导致材料在黏着和犁削过程的剥落体积更大，经辐照后PA66的摩擦因数上升、磨损率增大。 |
| 英文摘要: |
| The work aims to study the molecular structure and tribological properties of PA66 irradiated by gamma rays at different doses in atmospheric environment, so as to understand the change trend of tribological properties of PA66 under irradiation environment, and link the macroscopic changes of tribological properties with the microscopic changes at molecular scale, hoping to provide references for the application of PA66 in irradiation environment. PA66 was irradiated by gamma rays at doses of 50, 100, 250, 500 and 1 000 kGy in atmospheric environment, respectively. The changes of functional groups of PA66 were monitored by infrared spectroscopy and X-ray photoelectron spectroscopy, and the degree of molecular cross-linking and crystallization was evaluated by gel content test and differential scanning calorimetry. The tribological test was carried out by blocky PA66 and 6 mm diameter metal ball with reciprocating motion, and the friction coefficient during the test was obtained. Combined with the wear rate and wear morphology, the tribological properties and wear mechanism changes of PA66 before and after irradiation were analyzed. The results showed that the gel content of PA66 was 1.31% when untreated, and increased to 60.77% after gamma ray irradiation to 1 000 kGy, indicating that the molecular chains of PA66 were mainly cross-linked under γ-ray treatment. The results of infrared spectroscopy and X-ray photoelectron spectroscopy showed that the surface oxidation degree of PA66 increased with the increase of irradiation dose, and a new hydroxyl functional group was formed at 1 000 kGy. The crystals of PA66 were damaged by gamma ray. The degree of crystallization of the material obtained by DSC test was 30.78% under the unirradiated condition, and slightly decreased to 25.07% when the dose reached 1 000 kGy. The tribological properties of PA66 deteriorated significantly with the increase of irradiation dose, the friction coefficient increased from 0.49 to 0.615, and the depth and width of the wear tracks increased from 34.8 μm and 796 μm to 174.6 μm and 2 225 μm, respectively. When the radiation dose did not reach 500 kGy, the wear mechanism of the entire wear track was adhesion and plough cutting. When the radiation dose reached 500 kGy, the wear mechanisms of the center and edge of the PA66 wear track were significantly different. The material at the center of the wear track was still lost in the form of adhesion and plough cutting, the wear mechanism at the edge of wear track changed to fatigue wear because the new cracks were connected with the cracks generated by irradiation. Although the wear mechanism of the center of the wear track is the same before and after irradiation, the self-lubrication property of PA66 is weakened due to the change of the cross-linking degree of the material after irradiation, and the morphology of the center of the wear track is changed. The increase of single wear debris with the increase of radiation dose can support the deterioration of tribological properties of PA66 due to the increase of cross-linking degree. |
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