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Development of correlations between process operation, granule structure and product properties - Influence of spray- and process parameters on internal structure and mechanical properties of ceramic granules

工艺操作、颗粒结构和产品性能之间相关性的发展 - 喷雾和工艺参数对陶瓷颗粒内部结构和机械性能的影响

基本信息

批准号：
121056710
负责人：
Dr. Manfred Fries
金额：
--
依托单位：
Fraunhofer-Institut für Keramische Technologien und Systeme (IKTS)
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/121056710?language=en
关键词：
Development correlations between process operation

项目摘要

Spray dried ceramic, metallic or hard metal based granules have to meet defined properties and should be well designed for subsequent handling and treatment in powder processing. Especially well designed mechanical properties and homogeneous internal structure of spray dried granules are important for a high quality and reliability of ceramic parts formed by die pressing from ceramic bulk material. Besides the influence of complex spraying suspension properties on resulting granule structure and therefore on the mechanical granule properties, these granule properties will be influenced by spraying and drying parameters too. In second project section of SPP basic correlations between essential formulation parameters and suspension properties as well as correlations between suspension properties and resulting structure and mechanical properties of granules were identified. Previous results have shown, that kind and properties of organic additives have a strong influence on internal structure and resulting mechanical properties of granules. Structure generation is depending on migration and drying behavior of these additives. To analyze these effects a suitable method for quantification of additive distribution within the granules structure is necessary. Therefore an important topic in third project section will be the qualification of the previous developed method for structure quantification. Further key activities are investigations in dependence of granule structure on different spraying and drying conditions. These investigations will base on experimental works in real spray dryers of different size as well as drying experiments at single droplets. Furthermore an inline droplet size measurement within a spray dryer is intended. Within these tests shrinking and drying behavior of ceramic suspension droplets will be analyzed under real process conditions in consideration of varied process parameters. Finally all identified effects of formulation, suspension properties and process parameters on internal structure and mechanical properties will be evaluated. With these results it should be possible to form detailed process knowledge for product design as well as a suitable data set up for modeling of structure generation in spray drying process by other groups within SPP.

喷雾干燥的陶瓷、金属或硬质金属基颗粒必须满足规定的性能，并应针对粉末加工中的后续处理和处理进行良好设计。喷雾干燥颗粒的特别良好设计的机械性能和均匀的内部结构对于由陶瓷块体材料通过模压形成的陶瓷部件的高质量和可靠性是重要的。除了复杂的喷雾悬浮液性质对所得颗粒结构从而对颗粒机械性质的影响外，这些颗粒性质也会受到喷雾和干燥参数的影响。在SPP的第二个项目部分中，确定了基本配方参数与悬浮性能之间的基本相关性以及悬浮性能与颗粒的结构和机械性能之间的相关性。先前的结果表明，有机添加剂的种类和性质对颗粒的内部结构和由此产生的机械性能具有强烈的影响。结构生成取决于这些添加剂的迁移和干燥行为。为了分析这些影响，需要一种合适的方法来量化颗粒结构内的添加剂分布。因此，第三个项目部分的一个重要课题将是以前开发的结构量化方法的资格。进一步的关键活动是研究颗粒结构对不同喷雾和干燥条件的依赖性。这些研究将基于在不同尺寸的真实的喷雾干燥器中的实验工作以及单液滴干燥实验。此外，旨在喷雾干燥器内的在线液滴尺寸测量。在这些测试中，将在考虑到变化的工艺参数的真实的工艺条件下分析陶瓷悬浮液滴的收缩和干燥行为。最后，将评价配方、悬浮液性能和工艺参数对内部结构和机械性能的所有确定影响。有了这些结果，它应该是可能的，以形成详细的产品设计过程中的知识，以及一个合适的数据集建立模型的结构生成在喷雾干燥过程中由SPP内的其他组。