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Articles by Changqing Hong
Total Records ( 2 ) for Changqing Hong
  Dejiang Chen , Weijie Li , Xinghong Zhang , Ping Hu , Jiecai Han , Changqing Hong and Wenbo Han
  This paper investigated the thermal shock behavior of hot-pressed zirconium diboride (ZrB2–10 vol%SiC–10 vol%ZrO2) composite by means of water quenching. Under single thermal shock, the retained strength presented sharp degradation with the temperature difference (ΔT) above 500 °C. Differently, the retained strength decreased rapidly with ΔT above 300 °C under five-cycle thermal shock. Analysis of the microstructural features also showed discrepancy for the composite under different thermal shock conditions. Further discussion found that the thermal shock resistance of ZrB2–SiC–ZrO2 composite was influenced by the intrinsic properties as well as the oxidation behavior under high temperature.
  Tao Zhu , Weijie Li , Xinghong Zhang , Ping Hu , Changqing Hong and Ling Weng
  ZrB2–10 vol.% SiC ceramics were hot pressed with addition of two contents of ZrO2, i.e., 10 vol.% and 20 vol.%. Oxidation behavior of ZrB2–SiC–ZrO2 ceramics was investigated using muffle furnace in the temperature range of 800–1200 °C in air. With the increase in temperature and extension in holding time, two ceramics both presented more and more severe oxidation behavior. Comparatively, results of microstructure indicated that ceramic with 10 vol.% ZrO2 always exhibited lighter variation in structure after oxidation. Further discussion showed that ceramic with 10 vol.% ZrO2 also provided lower mass gain and thinner oxidized layer. Analysis of oxidation mechanism revealed that excessive addition of ZrO2 brought much path to the inward transport of oxygen and therefore led to the serious oxidation for ZrB2–SiC–ZrO2 ceramics.
 
 
 
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