Samarium oxide(Sm2O3)/boron carbide(B4C)/high-density polyethylene(HDPE)composites are respectively prepared by using synthesized Sm2O3 fillers(Sm2O3-Ⅰ)and commercial Sm2O3 fillers(Sm2O3-Ⅱ)for neutron and gamma radiation shielding.The X-ray diffraction(XRD)patterns reveal that the phase of Sm2O3-Ⅰ fillers is a cubic crystal system,body-centered cubic lattices,and its space group is Ia(3)(206).However,Sm2O3-Ⅱ fillers have two phases.One is a monoclinic crystal system,simple monoclinic lattices,and its space is C2/m(12).The other one is a cubic crystal system,body-centered cubic lattices,and the space group is Ia(3)(206).Field emission scanning electron microscopy(FESEM)and specific surface area analyses reveal that the micromorphology of Sm2O3-Ⅰ fillers is micron plate with silt and its Brunauer-Emmett-Teller(BET)specific surface area(SBET)is 5.15 m2/g,while irregularly shaped Sm2O3-Ⅱ fillers have two kinds of micromorphology caused by the two phases of Sm2O3-Ⅱ fillers,which are plate-like agglomeration and agglomeration without specific shape,and the SBET of Sm2O3-Ⅱ fillers is 2.47 m2/g.The melting temperature(Tp)and yield strength(σy)of the synthesized Sm2O3-Ⅰ/B4C/HDPE composites are respectively 140.6 ℃ and 22.6 Mpa,which are better than the commercial Sm2O3-Ⅱ/B4C/HDPE composites.The neutron and gamma radiation shielding tests reveal that the synthesized Sm2O3 fillers with even size and high BET-specific surface area can improve the neutron and gamma radiation shielding performance of composites.10％Sm2O3-Ⅰ/20％B4C/70％HDPE(mass fraction)with a thickness of 15 cm has a neutron radiation shielding rate of 98.4％under the 252Cf neutron source and a gamma radiation shielding rate of 71.7％under 137Cs gamma source.
万方数据