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Microwaves process to elaborate B4C-SiC composite by silicon infiltration and reaction, for ballistic applications.

Abstract : Many studies have shown the feasibility of processing silicon-boron carbide composite by infiltration of molten silicon through a porous preform made of boron carbide (Reaction Bonding Process). Using this method, the obtained composite contains a large amount of boron carbide, which is the hardest and the most interesting phase for ballistic application. In our developed process, the maximum processing temperature is 1600°C, which is far below the usual high temperature stage/pressure conditions commonly used to sinter B4C by conventional method (respectively 2200°C and40MPa). The main goal of this thesis is to develop a novel reaction bonded process based on microwave heating. Microwaves heating has many interesting features, including fast heating process, selective heating mechanism (in case of heating multi-materials) and volumetric heating distribution. . To fulfill our goal, many technological issues need to be addressed (working in controlled atmosphere and under microwave field, high temperature ...). This thesis reports the development of this novel process, and materials made from it, exhibit similar properties compared to those made conventionally. However, some microstructural differences were observed in SiC resulting phases. This thesis has allowed to-find out the boron carbide composite piece fabrication conditions in microwave cavity (Argon/Hydrogen10%, slight overpressure: 14bars)-show that mechanical properties (hardness, Young’s modulus…) obtained are comparable to those measured on conventionally reaction bonded produced materials. -show that formed SiC has some microstructural peculiarities, between vacuum samples (for conventional) and ones obtained in hydrogenous argon (using microwave).-show that it is possible to produce larger size piece (66mm of diameter). These results are shown to be promising for ballistic applications, including the fabrication of bulletproof jacket and light armor
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Submitted on : Monday, July 30, 2018 - 11:31:26 AM
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Mathieu Dutto. Microwaves process to elaborate B4C-SiC composite by silicon infiltration and reaction, for ballistic applications.. Other. Université de Lyon; BEN GURION UNIVERSITY OF NEGEV, 2017. English. ⟨NNT : 2017LYSEM021⟩. ⟨tel-01851486⟩

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