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Aqueous pressure slip casting of coarse-grained, carbon-containing refractories

粗粒含碳耐火材料的水压注浆成型

基本信息

批准号：
272400617
负责人：
Professor Dr.-Ing. Christos G. Aneziris
金额：
--
依托单位：
Professur für Keramik, Feuerfest und metallokeramische Verbundwerkstoffe
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/272400617?language=en
关键词：
Aqueous pressure slip casting coarse

项目摘要

The aim of the project is to develop in the frame of basic research suitable shaping conditions for the application of pressure slip casting to coarse-grained, carbon-containing refractories. The influence of different grain size distributions based on the Dinger and Funk model approach on the rheological and casting behaviour, the microstructure, and the properties of refractory is investigated. One of the main challenges is the development of a suitable slurry composition providing sufficient wettability of the carbon and preventing sedimentation of the coarse grains. A novel, environment-friendly binding agent mixture is used. After optimising the rheological behaviour of the suspensions, the green body formation from these slurries in a pressure filtration device and the compressibility of the cake in a compression-permeability cell are examined. Then, casting in a commercial slip casting machine is investigated. A computer tomograph is used for detecting flaws in the ceramic, such as cavities and gradients in porosity. Furthermore, a so-called order parameter is determined by image analysis using methods of point process statistics and correlated with the material properties depending on the grain size distribution. The project should provide the basis for a new processing for coarse-grained, carbon-containing refractories with complex geometries by a near-net shape forming technology, with improved properties and no damage of the coarse grain.

该项目的目的是在基础研究的框架内，为压力滑移铸造在粗粒含碳耐火材料中的应用开发合适的成型条件。基于Dinger和Funk模型方法，研究了不同晶粒尺寸分布对耐火材料流变学和铸造行为、显微组织和性能的影响。主要的挑战之一是开发一种合适的浆液组成，提供足够的碳润湿性和防止粗大颗粒的沉积。使用了一种新型的环保型粘合剂混合物。在优化了悬浮液的流变行为后，在压力过滤装置中检测了这些浆液形成的绿体，并在压渗池中检测了滤饼的可压缩性。然后，研究了在商用滑铸机上的铸造。计算机层析成像仪用于检测陶瓷中的缺陷，如空洞和孔隙度的梯度。此外，利用点过程统计方法对图像进行分析，确定了所谓的有序参数，并根据晶粒尺寸分布与材料性能相关联。该项目将为采用近净成形技术加工具有复杂几何形状的粗粒含碳耐火材料提供基础，该技术可改善性能，且不破坏粗粒。