Additive processing of ceramic fiber composite structures using laser technologyWednesday (24.06.2020) 09:20 - 09:40 Room 3
Ceramic matrix composites (CMCs) are refractory ceramic fiber composites with damage tolerant behavior. Coming from space applications, this class of materials is used for high performance break discs, kiln furniture and has a growing applicability in aerospace industry. Common methods of manufacturing long fiber reinforced ceramic matrix composites such as Polymer Infiltration Pyrolysis (PIP), Liquid Silicon Infiltration (LSI), Chemical Vapor Phase Infiltration (CVI) and sintering processes are very time and cost intensive. In addition, a complete, homogeneous filling of the fiber voids with matrix material is limited by cavities that close during the process.
The process described in the patent DE 102015205595 B3 is intended to greatly reduce the required process times and costs and function independently of wall thickness. For this purpose, a fiber bundle is desized and infiltrated with ceramic slurry. The bundle infiltrated with matrix material is dried and then applied to a molded body. During application, the matrix material is melted by laser radiation without damaging the fiber bundle.
First tests with press specimens have shown that a laser with a wavelength of 10.6 µm is suitable for melting the selected matrix material without damaging the fiber material. The presentation will show the implementation of the machine concept, which should enable the production of first test specimens. The presented results are from the AGENT-3D project LasCer funded by the Federal Ministry of Education and Research (BMBF).