In industrial applications, filter materials are often chosen according to cost as well as their processing and thermomechanical properties, but rarely in terms of their behavior during filtration, which is largely due to there being insufficient information available on the influence of filter materials and surface quality on filtration behavior. In this study, the manufacture of functionalized Al2O3 nanofilters was investigated, along with their filtration performance in short- and long-term filtration trials. In addition, sessile drop tests were performed to measure the contact angle of the nanofunctionalized materials, and yielded an approximately 10 deg (11 pct) higher contact angle for nanocoated materials sintered at 800 °C and 1250 °C than for those sintered at 1600 °C and an approximately 23 deg (23 pct) higher contact angle compared to surfaces without a nanocoating. The filtration mechanism was assessed by means of Porous Disk Filtration Analysis (PoDFA) and Liquid Metal Cleanliness Analyzer (LiMCA) monitoring systems, as well as by analysis of the used and infiltrated filters using Scanning Electron Microscopy and Energy Dispersive X-ray analysis (SEM/EDX) technology. Both short-term and long-term filtration trials showed that the filtration behaviors of the reference and nanocoated filters were comparable. It was therefore determined that nanocoating of such filters with Al2O3 does not provide any improvement with regard to filtration performance.

中文翻译：

---

具有 Al2O3 纳米涂层的陶瓷泡沫过滤器对使用和不使用晶粒细化剂测试的铝过滤行为的影响

在工业应用中，过滤材料的选择通常是根据成本及其加工和热机械性能，但很少根据过滤过程中的行为来选择，这主要是因为关于过滤材料和表面质量影响的可用信息不足关于过滤行为。在这项研究中，研究了功能化 Al2O3 纳米过滤器的制造，以及它们在短期和长期过滤试验中的过滤性能。此外，还进行了静滴试验以测量纳米功能化材料的接触角，并且在 800 °C 和 1250 °C 下烧结的纳米涂层材料的接触角比在 1600 °C 下烧结的材料高约 10 度（11 pct），并且与没有涂层的表面相比，接触角高约 23 度（23 pct）纳米涂层。通过多孔盘过滤分析 (PoDFA) 和液态金属清洁度分析仪 (LiMCA) 监测系统以及使用扫描电子显微镜和能量色散 X 射线分析 (SEM) 分析使用过和渗透的过滤器来评估过滤机制/EDX) 技术。短期和长期过滤试验均表明，参考过滤器和纳米涂层过滤器的过滤行为具有可比性。因此可以确定，用Al 2 O 3 对这种过滤器进行纳米涂层并没有提供关于过滤性能的任何改进。