Microstructure and Erosion Resistance of in-situ SiAlON Reinforced BN-SiO2 Composite Ceramics
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2016年第2期
论文作者：田卓 DUAN Xiaoming YANG Zhihua YE Shuqun 贾德昌 ZHOU Yu
文章页码：315 - 320
摘 要：BN-SiO2-SiAlON composite ceramics were successfully prepared by the means of hot pressed sintering.Xe plasma flow generated by HallThruster was used for sputtering the surface of the samples in order to evaluate the plasma erosion resistance.XRD,TEM,SEM,and LSCM were used to characterize the phase composition and morphologies of as-made composite ceramics before and after Xe plasma erosion.The ceramics were composed of h-BN,fused silica,and SiAlON,which maintained structuralstability during the process of Xe plasma sputtering.In conclusion,comparing with BN-SiO2 composite ceramics,the plasma erosion rate of BN-SiO2-SiAlON composite ceramics decreases significantly at first then rises with the increase of AlN addition.Erosion pits can be observed by using SEM on the surface after plasma sputtering,which demonstrates that the BN grains have dropped off the surface.In addition,mechanicaldenudation by high-speed Xe ions is recognized as the injury mechanism for the BN-matrix composite materials.
田卓，DUAN Xiaoming，YANG Zhihua，YE Shuqun，贾德昌，ZHOU Yu
Institute for Advanced Ceramics,School of Materials Science and Engineering,Harbin Institute of Technology
摘 要：BN-SiO2-SiAlON composite ceramics were successfully prepared by the means of hot pressed sintering.Xe plasma flow generated by HallThruster was used for sputtering the surface of the samples in order to evaluate the plasma erosion resistance.XRD,TEM,SEM,and LSCM were used to characterize the phase composition and morphologies of as-made composite ceramics before and after Xe plasma erosion.The ceramics were composed of h-BN,fused silica,and SiAlON,which maintained structuralstability during the process of Xe plasma sputtering.In conclusion,comparing with BN-SiO2 composite ceramics,the plasma erosion rate of BN-SiO2-SiAlON composite ceramics decreases significantly at first then rises with the increase of AlN addition.Erosion pits can be observed by using SEM on the surface after plasma sputtering,which demonstrates that the BN grains have dropped off the surface.In addition,mechanicaldenudation by high-speed Xe ions is recognized as the injury mechanism for the BN-matrix composite materials.
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