Abstract:

Polyamide 12 (PA12) and its composite with nanometersized silica (PA12/n-SiO₂) coatings were prepared by the flame spraying processThe thermal behavior, mechanical and tribological properties of the coatings were investigated with differential scanning calorimeter (DSC), electronic tensile testing machine and wear-test machine of MRH-3Fourier transform infrared spectroscopy (FTIR) was used to characterize polymer degradationThe FTIR analysis did not reveal the presence of any oxidation or degradation during the processingThe results showed that the addition of nano-SiO₂ could increase the crystallinity, improve the mechanical properties of the coatings and reduce friction and wear of pure polyamide 12 effectivelyIn addition, the nanocomposite coating containing 1.5%(mass) nanometersized silica displayed better properties

Key words:

火焰喷涂, n-SiO₂;PA12;复合涂层

摘要：

采用火焰喷涂法制备了聚酰胺12 (PA12)及聚酰胺12/纳米SiO₂ (n-SiO₂)复合涂层，并利用电子拉力机、摩擦磨损试验机、红外光谱仪（FTIR）和示差扫描量热仪（DSC）等对涂层的结构与性能进行了研究。红外光谱分析表明PA12及PA12/ n-SiO₂粉末在火焰喷涂过程中没有发生氧化或降解反应，表明火焰喷涂法适宜制备PA12及PA12/n-SiO2复合涂层;DSC分析结果表明n-SiO₂具有成核剂作用，能提高PA12大分子的结晶速度及结晶度;涂层力学性能及摩擦磨损性能分析表明n-SiO₂能提高涂层的力学性能，改善涂层的耐老化性能和摩擦磨损性能。当n-SiO₂添加量为1.5%（质量）时，涂层综合性能最佳。

关键词:

火焰喷涂, n-SiO₂;PA12;复合涂层