纳米B_(4)C(BN)/环氧树脂复合材料制备及性能研究

Preparation and properties of nano-B_(4)C(BN)/epoxy resin composites

本文采用机械辅助的表面改性工艺,对氮化硼和碳化硼进行表面修饰,将其作为中子吸收填料制备微米和纳米BN(B_(4)C)/环氧树脂复合材料,比较了不同粒径下材料在微观形貌、机械性能、耐热性能的差异,并利用MCNP程序对纳米材料的中子屏蔽性能进行模拟。结果表明:2种纳米级的复合材料较微米级微观形貌更加平整,其中BN含量为20%的复合材料冲击强度从28 kJ/m^(2)提升至33 kJ/m^(2),拉伸强度从127 MPa提升至135 MPa,B_(4)C含量为20%的复合材料冲击强度由24 kJ/m^(2)提升至32 kJ/m^(2),拉伸强度从124 MPa提升至128 MPa,耐热性能也都有明显提升。模拟计算结果显示,2种环氧基复合材料对热中子有着良好的屏蔽性能,1 cm厚度的屏蔽板材对热中子屏蔽率接近100%。可作为一种良好的耐高温中子屏蔽材料。

In this paper, BN(B_(4)C)/epoxy resin composites with micron and nano-BN(B_(4)C)/epoxy resin were prepared by mechanical assisted surface modification process. The differences of micro structure, mechanical properties and heat resistance of materials with different particle sizes were compared, and the neutron shielding properties of nano materials were simulated by MCNP program. The results show that the two nano scale composites are smoother than the micron size composites. The impact strength of the composites with 20% BN content increased from 28 kJ/m^(2)to 33 kJ/m^(2), the tensile strength increased from 127 MPa to 135 MPa, the impact strength of the composites with 20% B_(4)C content increased from 24 kJ/m^(2)to 32 kJ/m^(2), the tensile strength increased from 124 MPa to 128 MPa, and the heat resistance also improved significantly.The simulation results show that the two kinds of epoxy matrix composites have good thermal neutron shielding performance, and the shielding rate of 1 cm thick shielding plate is close to 100%. It can be used as a good high temperature neutron shielding material.