Preparation and R-curve properties of laminated Si/SiC ceramics from paper |
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Authors: | Gangbin Yang Yinjuan Liu Guanjun Qiao Jianfeng Yang Hongjie Wang |
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Affiliation: | aState Key Laboratory for Mechanical Behavior of Materials, Xi‘an Jiaotong University, Xi‘an 710049, China;bLuoyang Institute of Science and Technology, Luoyang 471003, China |
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Abstract: | Laminated Si/SiC ceramics were synthesized from paper via impregnation with phenolic resin, followed by lamination and carbonization of the paper–resin laminates and subsequent infiltration and reaction with liquid silicon at a temperature of 1550 °C for 10–90 min. Due to the capillarity infiltration and in situ reaction with liquid silicon, intrinsic micro- and macrostructure in the carbon preform was retained within the final ceramics. The XRD, TGA, and microscopy analysis indicated that the final material exhibited a distinguished laminar structure with alternating arrangement of SiC and silicon layers. The thick SiC layer was composed of beta-SiC and a little of free silicon and un-reacted carbon. Studies on the evaluation of R-curves behavior by the indentation-strength method indicated a strong R-curve behavior for the Si/SiC composites. |
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Keywords: | Lamination Microstructure Paper Resistance-curve |
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