B_4C/C功能梯度材料制备及其性能研究  

Preparation and Properties of B_4C/C Functionally Graded Material by Hot-press Sintering

作　　者：张国兵[1] 郭全贵[1] 刘朗[1] 史景利[1] 翟更太[1] 宋进仁[1] 

机构地区：[1]中国科学院山西煤炭化学研究所炭材料重点实验室

出　　处：《材料工程》2007年第12期58-62,共5页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(10205023)

摘　　要：采用粉末冶金法中的叠层法在2000℃，40MPa的热压烧结条件下设计制备了B4C组分含量变化范围为10％～50％（质量分数）的B4C／C功能梯度材料（FGM）。同时，为了深入考察B4C／C FGM各叠层的性能，在相同的工艺条件下，制备了对应不同叠层的B4C／C均质复合材料。性能测试表明随着B4C含量的增加，对应B4C／C均质复合材料的密度、强度、电阻率、抗氧化性等性能均呈现单调递增的趋势；同时B4C／C FGM整体表现出低密度和高弯曲强度特征，分别可达2．16g／cm^3和138MPa。SEM图和XRD特征曲线表明B4C／C FGM梯度特征显著，抗氧化实验表明B4C／C FGM的抗氧化性也呈现比较明显的梯度变化特征，有望作为抗等离子体、单壁抗氧化等领域用材料。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 B4 C/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 B4 C content. B4 C/ C FGM whole has low density and high bending strength, 2.16g/cm^3 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.

关 键 词：功能梯度材料 B4C/C复合材料 热压工艺 

分 类 号：TB33[一般工业技术—材料科学与工程] TB34