荧（磷）光指示粒子在耐磨蚀自敏功能涂层中的耦合性研究

Wear and corrosion are two main ways of workpieces failure. To monitor the status of workpieces, the complicated measurement techniques such as acoustic emission, photothermal radiometry, ultrasonic vibrations and ferrography, etc. have been employed, in which various kinds of advanced sensor detectors have to be used to get the requiring information. Although highly successful, all those techniques are time-consuming and costly. The proposed project is aimed to develop a new generation of tribo-corrosion resistant coating and an in situ wear/corrosion monitor by illuminating using a combination of novel tribo-corrosion resistent materials, detonation-gun spraying process and phosphorescent/fluorescent particles. The phosphorescent/fluorescent compostie coatings are indistinguishable under normal lighting, but emit a constant glow under ultraviolet light. Thus, the wear and/or corrosion would be samply monitored.. The coupling and matching between phosphorescent/fluorescent light indicating particles and functional coating materials, fabrication processes and the coating functions will be deeply investigated. It involves the development of novel light-emitting and tribo-corrosion resistant composite coatings by detonation-gun spraying process; the investigation of the effect of preparation process factors on illuminating thermal degradation, luminescence quenching of the phosphorescence/fluorescence and response measurement on the same time; the investigation of interfacial mechanical performances between the sprayed functional coating materials and the phosphorescent/fluorescent indicator particles; the investigation of inherences of functional tribo-corrosion coatings materials on thermal illuminating degradation, luminescence quenching of the phosphorescence/fluorescence and the response measurement. Such a combination of functional tribo-corrosion resistant coating and an in situ wear/corrosion monitor with phosphorescence/fluorescence indicators is low cost and high throughputs, which enable in situ wear/corrosion detecting on the tribo-corrosion coatings and prevents damage to the expensive underlying base.. The implementation of the proposed project will possibly provide theoretical guidance and technological foundation for practical corrosive and/or wear industry.

磨损、腐蚀是机械失效的主要形式，在采用声发射、光热辐射、超声振动和铁谱技术等检测磨损及腐蚀情况时，都需要先进的传感器、丰富的生产数据经验或模型，昂贵并费时。申请项目目标是将耐磨蚀材料、低热效应热涂（熔）敷涂层制备技术与荧（磷）光粒子指示功能相结合，发展一种利用手持紫外线仪定期检测耐磨损、腐蚀功能层磨损及腐蚀状况的在线监测技术，研究荧（磷）光粒子指示功能与涂层材料、制备工艺和涂层使用功能之间的耦合匹配性。.项目研究探索将新型耐磨、蚀材料与荧（磷）光粒子的发光特性相结合的问题，确定通过爆炸喷涂涂层制备技术实现荧（磷）光功能复合涂层的制备工艺，研究喷涂工艺及工艺参数对荧（磷）光粒子热劣化、发光性猝灭效应的影响规律和应对机制，揭示荧（磷）光粒子在复合功能、指示涂层中共存、界面结合结构性能和功能涂层材料对荧（磷）光粒子发光性能影响之间的耦合规律，为该技术工业化应用提供理论和技术基础。

为简单有效地对磨损、腐蚀表面进行在线监测，项目在解决无机发光材料与金属基耐磨蚀功能层之间的性能和工艺匹配性的基础上，发展了一种对设备精细化程度要求低且价格低廉的发光指示技术来实现磨损及腐蚀功能层的在线监测方法。利用热压烧结、冷气动力喷涂、爆炸喷涂和等离子喷涂等工艺将耐磨蚀材料及具有指示功能的SrAl2O4:Eu2+,Dy3+磷光粒子耦合制备了耐磨自敏涂层；研究了金属材料接触、机械冲击和温度热效应等因素对磷光发光材料的劣化影响和猝灭机理；针对性地采用无定型SiO2包覆工艺解决耐磨蚀自敏复合涂层中发光离子猝灭问题，包覆对发光粒子进行保护及其对复合涂层的指示性能及腐蚀磨损性能改善意义重大。. 低温和中温阶段，接触金属在磷光粒子电子跃迁时充当了浅层陷阱能级和耗散中心、减少了电子复合的几率；金属接触是引起猝灭的主要因素，不同金属复合涂层发光强度的大小依次是镍基>铁基>铜基>高铝青铜基>锰基。热喷涂过程中，大部分的被捕获电子都是要通过价带的传导才能与空穴陷阱复合，磷光粒子获得高能量超过了基态振动能级，并使发光中心进入较高的震动能级、达到热猝灭的临界点并发生猝灭；冷喷涂时磷光颗粒获得较大动能后发生碎裂、缺陷增加，机械作用力导致的猝灭大于热喷涂涂层中热猝灭效应。. 通过溶胶-凝胶法改变正硅酸四乙酯在前驱体的配比，在铝酸锶磷光粉体表面制备包覆15-20%无机SiO2的结构完整膜层，包覆膜层可有效增强铝酸锶颗粒的粉末硬度，达到564.5 HV。包覆膜层没有破坏铝酸锶的发光机制，还有效的减弱喷涂中发光颗粒的机械猝灭和热猝灭，SiO2的包覆可以有效的降低铝酸锶在制备过程中的猝灭，提高涂层的发光性能；复合涂层硬度相对未包覆复合涂层增强36%，耐磨性提升18%以上；包覆膜层可以有效降低复合发光涂层在盐溶液和酸溶液中的腐蚀速率，延缓碱性溶液的腐蚀作用。. 研究成果可以应用于使用手持紫外线仪定期检查磨损或腐蚀情况，保护关键耐腐蚀层和耐磨损功能层下机械不被损坏。另成果也可以用于设备装配部件防伪。