New Opportunities for the Aerosol Deposition Method by Substrate by Cryogenics

低温基底气溶胶沉积方法的新机遇

• 批准号: 388538917
• 负责人: Professor Dr.-Ing. Ralf Moos
• 金额: --
• 依托单位: Lehrstuhl für Funktionsmaterialien
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/388538917?language=en
• 关键词: New; Opportunities; Aerosol; Deposition; Method

Dense ceramic coatings in the range from 1 to 300 µm can be applied directly from ceramic powders without high temperature processes on almost any substrate materials using the aerosol deposition method (ADM), which is known in German as "aerosolbasierte Kaltabscheidung (room temperature impact consolidation)". Even ceramic coatings with low melting metals, glasses or very hard polymers can coated. The material properties of the deposited layer are thereby similar to the source material.In the ADM community it is repeatedly observed that the hardness difference between substrate and coating material as well as the mechanical properties of the substrate are key influencing factors for the ADM deposition success. Own observations suggest that softer materials can be deposited more easily and with much larger thicknesses on ceramics as harder ceramics. It seems that a certain minimum substrate hardness and substrate toughness must exist to deposit the powder as a dense adhesive film.In this project, we want to vary the mechanical properties of the substrate and the coating material by temperature variation, especially by cooling of the substrate or the powder over a large temperature range down to 77 K to investigate the effect of the mechanical properties on the ability to form high quality films. So far, only works are known, which explain the (negative) impact of an increase in substrate temperature.The project is planned for a period of two months (with required funding for only 18 person month). It starts with the modification of one of the chair's ADM coating machines so that powder and substrate cooling is possible. In order to determine the effect of temperature on the coating behavior, the actual coating tests are then carried out in the form of a test matrix at different temperatures for five substrate materials and four powders in a way that by temperature variations of substrate and powder material the deposition window is adjusted. For that purpose, materials that exhibit a large change in the mechanical properties in the low-temperature range are used.At the end of the project, a conceptual proof should have been provided showing that the cryogenics ADM improves the layer formation (higher deposition rates or higher layer quality) or allows an extension of the process window (deposition of materials that can otherwise not be deposited by ADM).

使用气溶胶沉积法（ADM），可以在几乎任何基材上直接从陶瓷粉末中涂覆1至300 µm的致密陶瓷涂层，而无需高温工艺，该方法在德语中称为“aerosolbasierte Kaltabscheidung（室温冲击固结）"。甚至可以涂覆低熔点金属、玻璃或非常硬的聚合物的陶瓷涂层。因此，沉积层的材料性能与源材料相似。在ADM领域，人们反复观察到，基底和涂层材料之间的硬度差异以及基底的机械性能是ADM沉积成功的关键影响因素。自己的观察表明，较软的材料可以更容易地沉积在陶瓷上，并且与较硬的陶瓷相比具有更大的厚度。似乎必须存在一定的最小基底硬度和基底韧性才能将粉末存款为致密的粘合膜。在这个项目中，我们想通过温度变化来改变基底和涂层材料的机械性能，特别是通过在低至77 K的大温度范围内冷却基底或粉末，以研究机械性能对形成高硬度的能力的影响。质量电影。到目前为止，只有工程是已知的，这解释了（负面）影响的基板温度上升。该项目计划为期两个月（所需资金仅为18人月）。它开始与椅子的ADM涂层机之一的修改，使粉末和基板冷却是可能的。为了确定温度对涂层行为的影响，然后以测试矩阵的形式在不同温度下对五种基底材料和四种粉末进行实际涂层测试，通过基底和粉末材料的温度变化来调节沉积窗口。为此，我们使用了在低温范围内机械性能变化较大的材料。在项目结束时，我们应该提供一个概念性的证明，证明低温ADM可以改善层的形成（更高的沉积速率或更高的层质量），或者可以扩展工艺窗口（沉积ADM无法沉积的材料）。