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《Materials Science and Technology》 2009-02
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High-temperature ablation behavior of TiB_2-Cu matrix cermets

XU Li1,HAN Jie-cai1,ZhANG Xing-hong1,XU Qiang2(1.Center for Composite Materials and Structure,Harbin Institute of Technology,Harbin 150001,China;2.School of Materials Science and Engineering, Beijing Institute of Technology,Beijing 100081,China)  
Both titanium diboride-copper-nickel and titanium diboride-copper cermets were fabricated by combustion synthesis under conditions of pseudo hot isostatic pressing.The samples were heated by a wind tunnel instrument to investigate the thermal shock resistance and ablation behavior.The microstructures and constituents of the cermets pre-and post-ablation were examined by SEM,EPMA and XRD.The result shows that there are some scour marks on the surface of samples after ablation,and cracks are found on the surface of TiB2-40Cu sample due to its bad thermal shock resistance.The mass loss ratio of TiB2-40Cu-8Ni cermet after ablation is lower than that of TiB2-40Cu.The result of SEM shows that there is an ablation area about 100 μm near the ablation surface of TiB2-40Cu.The ablation mechanism of TiB2-40Cu cermet is the melting of metal binder,hot chemical ablation and mechanical erosion.
【Fund】: 国家自然科学基金重点资助项目(90205034);; 自然科学基金重点项目(90505015)
【CateGory Index】: TG148
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