Long fibre reinforced ceramics with active fillers and a modified intra-matrix bond based on the LPI process |
| |
| Affiliation: | 1. German Aerospace Center (DLR), Pfaffenwaldring 38-42, D-70569 Stuttgart, Germany;2. University Bayreuth, Ludwig-Thoma-Straße 36 b, D-95447 Bayreuth, Germany;1. Department of Mechanical Engineering, PDPM Indian Institute of Information Technology, Design and Manufacturing Jabalpur, Dumna Airport Road, Jabalpur, Madhya Pradesh, 482005, India;2. Department of Mechanical Engineering, Manav Rachna International Institute of Research & Studies, Faridabad, India;3. Department of Mechanical Engineering, Amity School of Engineering and Technology, Amity University Madhya Pradesh, Gwalior, India;1. University of Bayreuth, Ceramic Materials Engineering (CME), Prof.-Rüdiger-Bormann-Straße 1, 95447, Bayreuth, Germany;2. Bayerisches Laserzentrum GmbH, Konrad-Zuse-Straße 2-6, 91052, Erlangen, Germany;1. Mirco and Nano-technology Research Center, State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China;2. National Innovation Institute of Additive Manufacturing, Xi’an 710000, PR China;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;2. Engineering Laboratory of Specialty Fibers and Nuclear Energy Materials (FiNE), Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China;3. School of Materials Science and Engineering, Yeungnam University, Gyeongsan, South Korea;1. Institute of Solid-State Chemistry Ural Branch of Russian Academy of Science, Yekaterinburg, Russia;1. Defence Metallurgical Research Laboratory, P.O. Kanchanbagh, Hyderabad, 500058. India;2. National Aerospace Laboratories, Bangalore, 560017. India |
| |
| Abstract: | Silicon-based preceramic polymers are attractive candidates for the manufacture of high temperature and corrosion resistant ceramics, particularly in regard to the formation of a ceramic matrix in long fibre reinforced ceramic matrix composites (CMCs). The manufacture of CMCs constitutes of the infiltration of fibre preforms followed by a subsequent crosslinking and pyrolysis of the Si-precursor, yielding an amorphous ceramic matrix. However, due to the inherent shrinkage of ceramic precursors, a high number of polymer impregnation and pyrolysis (PIP) cycles is required to obtain dense composites. Nevertheless, their microstructure is characterized by large interbundle pores which show a negative impact on the mechanical properties.In order to improve the performance of the long fibre reinforced CMCs as well as to accelerate the manufacturing process, a novel approach was investigated. Thereby, micro-sized powders of Al and Ti are used as active fillers. The powders were strewed between the fabric plies and infiltrated by the resin transfer moulding (RTM) technique. Since reactions with the polymer matrix are associated with a volume increase during pyrolysis, a more dense ceramic matrix is obtained.The processing of the CMCs employs the commercial polysilazanes CERASET SN and VL20 as preceramic precursors. The reinforcement constitutes of Tyranno SA fibres. To densify the composites, up to five PIP cycles were performed. CMC samples were aged in air to evaluate the impact of oxidation on microstructure and mechanical properties. Microstructural characterization was conducted using both optical and electron microscopy. The conversion of the filler particles was analysed by means of EDX and XRD. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
