孔径对空心玻璃微球力学性能的影响

Effects of Pore Size on the Mechanical Properties of HGM

为实现大分子气体的充入,对空心玻璃微球(HGM)开孔使分子半径较大的Ar气从微孔进入球内,再对微孔进行封胶处理。空心玻璃微球表面的微孔将导致其力学性能(耐压强度)发生改变。运用扫描电子显微镜观察微孔周边形貌并对封胶后的HGM进行了耐压强度测试。结果表明:开孔后,空心玻璃微球孔口处完好,未出现微裂纹,随着孔径的改变,其耐压强度有所差异,当孔径为15μm时,空心玻璃微球的耐压强度降低量最小,其减少值为11.9%;利用有限元分析法对不同孔径的HGM在外压下所受应力进行模拟,模拟结果表明微球的加工孔径越小,其所受应力越小,与实验结果相吻合。

In order to let Ar with large atomic radius gas get into the hollow glass microspheres(HGM),a pore is drilled on HGM by using laser and then the micro pore is sealed.The tiny pore can change the mechanical properties(compression strength).The compression strength of HGM is one of the most important properties.The scanning electron microscopy(SEM)is used to observe the small pore and the compression strength of HGM is tested in the experiment.The results show that after the drilling,there are no tiny cracks near the pore.The compression strength is different with the change of the pore sizes.When the pore size is 15μm,the compression strength reaches the minimum value,decreasing by 11.9%.At the same time,the stress of HGM with different pore sizes is also simulated by using finite element analysis.The results show that the smaller the pore size is,the less the stress is,which coincides well with the experimental results.