纳米Al2O3粒子含量对碳泡沫复合材料力学和高温氧化性能的影响

Influence of Content of Al 2O 3 Nanoparticles on the Mechanical and High-temperature Oxidation Properties of Carbon Foam Composites

以锆改性酚醛树脂为碳源,纳米Al 2O 3粒子为增强相,酚醛空心微球为闭孔微球相,利用压塑成型-碳化工艺制备纳米Al 2O 3粒子增强碳泡沫复合材料。通过扫描电子显微镜(SEM)、万能试验机和热氧化炉研究了纳米Al 2O 3粒子含量对碳泡沫复合材料的微观结构、压缩和弯曲性能及抗氧化性能的影响。结果表明,纳米Al 2O 3粒子的加入使得基体与微球界面变粗糙,二者结合更紧密;当纳米Al 2O 3粒子的质量分数为10%时,碳泡沫复合材料的压缩强度和比压缩强度均达到最大值,分别为18.53 MPa和37.82 MPa·cm 3·g-1,较改性前分别提高了97%和61.41%;而纳米Al 2O 3粒子的加入并没有明显改善碳泡沫复合材料的弯曲性能;当纳米Al 2O 3粒子的质量分数为15%时,碳泡沫的抗氧化性能最好;700℃等温氧化30 min,失重为28.15%。

Al 2O 3 nanoparticles reinforced carbon foam composites,with zirconium modified phenolic resin as origin of carbon,Al 2O 3 nanoparticles as reinforcement,and phenolic hollow microspheres as closed phase,were prepared by the process of compression molding and carbonization.The effects of the amount of Al 2O 3 nanoparticles on the microstructure,compression and bending properties,and oxidation resistance of carbon foam composites were investigated by SEM,universal testing machine and thermal oxidation furnace,respectively.Results showed that Al 2O 3 nanoparticles induced the rough interface between the matrix and the microspheres,making them more tightly bonded.When the amount of Al 2O 3 nanoparticles was 10wt%,the compressive strength and specific compressive strength both reached the maximum,18.53 MPa and 37.82 MPa·cm 3·g-1,respectively.Compared to pure carbon foam,the compressive strength and specific compressive strength of modified carbon foam increased by 97%and 61.41%,respectively.While the addition of Al 2O 3 nanoparticles did not improve the bending properties significantly.When the content of Al 2O 3 nanoparticles is 15wt%,the oxidation resistance performance shows the best;the weight loss is 28.15%during the isothermal oxidation,at 700℃for 30 min.