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《Journal of Materials Engineering》 2007-12
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Preparation and Properties of B_4C/C Functionally Graded Material by Hot-press Sintering

ZHANG Guo-bing1,2,GUO Quan-gui1,LIU Lang1,SHI Jing-li1,ZHAI Geng-tai1,SONG Jin-ren1 (1 Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;2 Graduate school,Chinese Academy of Sciences,Beijing 100039,China)  
Crack-free five-layered B4C/C functionally graded material(FGM) was designed and fabricated by a powder stacking method and hot-pressing process under pressure of 40MPa at 2000℃ with B4C content changing from 10%(mass fraction) to 50%.Furthermore, in order to study the properties of graded layers of B4C/C FGM,the corresponding B4C/C homogeneous composites were fabricated under the same conditions.The structure and some properties of B4C/C homogeneous composites and FGM were analyzed.The results show that the density,strength,electrical resistivity and oxidation resistance of the homogeneous composites are all improved with the increase of B4C content.B4C/C FGM whole has low density and high bending strength,2.16g/cm3 and 138MPa,respectively.SEM micrographs and XRD patterns show that the structure of the FGM has the excellent gradient characteristic.The oxidation experiment shows that the oxidation resistance of the FGM also has the same characteristic,and would be used for the oxidation resistance or plasma facing component field.
【Fund】: 国家自然科学基金资助项目(10205023)
【CateGory Index】: TB34
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