Abstract
The structural evolution of a silicon oxynitride fiber reinforced boron nitride matrix (Si-N-Of/BN) wave-transparent composite at high temperatures was investigated. When heat treated at 1600 °C, the composite retained a favorable bending strength of 55.3 MPa while partially crystallizing to Si2N2O and h-BN from the as-received amorphous structure. The Si-N-O fibers still performed as effective reinforcements despite the presence of small pores due to fiber decomposition. Upon heat treatment at 1800 °C, the Si-N-O fibers already lost their reinforcing function and rough hollow microstructure formed within the fibers because of the accelerated decomposition. Further heating to 2000 °C led to the complete decomposition of the reinforcing fibers and only h-BN particles survived. The crystallization and decomposition behaviors of the composite at high temperatures are discussed.
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The financial supports by the National Science Foundation of China (No. 50902150, 51302314), Aid Program for Science and Technology Innovation Research Team in Higher Educational Institution of Hunan Province, Aid Program for Innovative Group of National University of Defense Technology and China Scholarship Council (No. 201306110050) are gratefully acknowledged.
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Zou, C., Li, B., Zhang, C. et al. Structural Evolution of Silicon Oxynitride Fiber Reinforced Boron Nitride Matrix Composite at High Temperatures. J. of Materi Eng and Perform 25, 487–492 (2016). https://doi.org/10.1007/s11665-015-1873-7
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DOI: https://doi.org/10.1007/s11665-015-1873-7