Evaluation of thermal shock resistance of BNNTs/Si<sub>3</sub>N<sub>4</sub> composites based on the second heat shock factor

WANG Shouren; WANG Gaoqi; YANG Xuefeng; WANG Yanjun; QIAO Yang; YANG Liying; GUO Peiquan

doi:10.13801/j.cnki.fhclxb.20170531.005

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Article Navigation > Acta Materiae Compositae Sinica > 2018 > 35(2): 410-417

WANG Shouren, WANG Gaoqi, YANG Xuefeng, et al. Evaluation of thermal shock resistance of BNNTs/Si3N4 composites based on the second heat shock factor[J]. Acta Materiae Compositae Sinica, 2018, 35(2): 410-417. doi: 10.13801/j.cnki.fhclxb.20170531.005

Citation:

WANG Shouren, WANG Gaoqi, YANG Xuefeng, et al. Evaluation of thermal shock resistance of BNNTs/Si₃N₄ composites based on the second heat shock factor[J]. Acta Materiae Compositae Sinica, 2018, 35(2): 410-417. doi: 10.13801/j.cnki.fhclxb.20170531.005

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Evaluation of thermal shock resistance of BNNTs/Si₃N₄ composites based on the second heat shock factor

doi: 10.13801/j.cnki.fhclxb.20170531.005

School of Mechanical Engineering, University of Ji'nan, Ji'nan 250022, China

Received Date: 2017-02-13
Rev Recd Date: 2017-05-16

Abstract

Abstract

The second heat shock factor model of BNNTs reinforced ceramic composites was constructed based on Kingery thermal shock theory. The BNNTs/Si₃N₄ composites with weight fractions of 0.5wt%, 1.0wt%, 1.5wt% and 2.0wt% were prepared by hot pressed sintering process. The thermal shock resistance of the composite materials was tested by indentation method, verifying the second heat shock factor model in the steady state. The results indicate that the thermal shock performance of the material is enhanced by the BNNTs, with the increase of the second heat shock factor. Because the BNNTs which are distributed on the grain boundary make the crack pinned, bridged, and deflected, the crack propagation resistance is increased.
- composites,
- Si₃N₄,
- the second heat shock factor,
- BNNTs,
- ceramic turbine
Long Abstrsct
Innovation Points