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    胡海霞, 刘正果. hBN含量对hBN/聚氨酯丙烯酸酯复合材料力学和摩擦学性能的影响[J]. 机械工程材料, 2024, 48(9): 74-80. DOI: 10.11973/jxgccl240214
    引用本文: 胡海霞, 刘正果. hBN含量对hBN/聚氨酯丙烯酸酯复合材料力学和摩擦学性能的影响[J]. 机械工程材料, 2024, 48(9): 74-80. DOI: 10.11973/jxgccl240214
    HU Haixia, LIU Zhengguo. Effect of hBN Content on Mechanical and Tribological Properties of hBN/Polyurethane Acrylate Composites[J]. Materials and Mechanical Engineering, 2024, 48(9): 74-80. DOI: 10.11973/jxgccl240214
    Citation: HU Haixia, LIU Zhengguo. Effect of hBN Content on Mechanical and Tribological Properties of hBN/Polyurethane Acrylate Composites[J]. Materials and Mechanical Engineering, 2024, 48(9): 74-80. DOI: 10.11973/jxgccl240214

    hBN含量对hBN/聚氨酯丙烯酸酯复合材料力学和摩擦学性能的影响

    Effect of hBN Content on Mechanical and Tribological Properties of hBN/Polyurethane Acrylate Composites

    • 摘要: 采用硅烷偶联剂KH550对六方氮化硼(hBN)纳米颗粒进行表面改性处理,利用立体光刻技术制备不同质量分数(0.05%,0.10%,0.15%,0.20%)hBN改性聚氨酯丙烯酸酯(hBN/PUA)复合材料,研究了hBN含量对复合材料力学性能和干摩擦磨损性能的影响。结果表明:随着hBN含量的增加,复合材料的拉伸和弯曲强度均先增再降,稳定摩擦因数和磨损质量损失均先减后增;当hBN的质量分数为0.10%时,复合材料的拉伸强度和弯曲强度最大,相较于纯PUA分别提高35.87%和36.92%,稳定摩擦因数和磨损质量损失均最小,与纯PUA相比分别降低31.03%和45.83%,此时复合材料的力学性能和耐磨性能最佳。当hBN的质量分数不高于0.10%时,hBN颗粒均匀地分布在PUA基体中,阻碍裂纹扩展,因此复合材料强度和耐磨性提高;当hBN质量分数大于0.10%时,hBN颗粒发生团聚,导致应力集中,强度和耐磨性能降低。

       

      Abstract: The hexagonal boron nitride (hBN) nanoparticles were surface modified by silane coupling agent KH550. The different mass fractions (0.05%, 0.10%, 0.15%, 0.20%) of hBN modified polyurethane acrylate (hBN/PUA) composites were prepared by stereolithography technology. The effect of hBN content on the mechanical properties and dry friction and wear properties of the composites was studied. The results show that with the increase of hBN content, the tensile and bending strengths of the composites first increased and then decreased, while the stable friction coefficient and wear mass loss first decreased and then increased. When the mass fraction of hBN was 0.10%, the tensile strength and bending strength of the composites were the highest, which increased by 35.87% and 36.92% compared with those of pure PUA, respectively; the stable friction coefficient and wear mass loss were the smallest, which decreased by 31.03% and 45.83% compared with those of pure PUA, respectively. At this time, the mechanical and wear resistance of the composites were the best. When the mass fraction of hBN was not larger than 0.10%, hBN particles were evenly distributed in the PUA matrix, hindering crack propagation, resulting in improvement of strength and wear resistance. When the mass fraction of hBN was larger than 0.10%, the hBN particles agglomerated, resulting in stress concentration, and the strength and wear resistance decreased.

       

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