The relative density of a sintered glass-powder compact varies at the local level due to its heterogeneous nature, which makes its characterization essential. In this work, high-resolution X-ray computed tomography (XCT) was used to quantitatively characterize the local relative density fluctuation of a sintered glass compact in its initial stage. The degree of heterogeneity of the microstructure was calculated taking into account the coarseness parameter. With a basis of 23,500 particles scanned in the representative volume element (RVE), the local environment was subdivided into three different groups of particles, represented by a cubic cell with a volume equivalent to that of approximately 600, 80 and 10 spherical particles with a diameter of 80 μm. Independent of the particle group analysed, we found that the maximum of the local relative density distributions, which could be described by a normal distribution function, always occurs around the relative density of the RVE. However, the fluctuation of the data showed a considerable change regarding the width, which increases as the volume of the analysed group of particles decreases, suggesting that particle packing is more heterogeneous on a small scale. In particular, we observed that the heterogeneity of the microstructure for the RVE under consideration becomes pronounced for groups of approximately 10 to 80 particles.

烧结玻璃粉末压块的相对密度由于其异质性而在局部水平上变化，这使得其表征必不可少。在这项工作中，高分辨率X射线计算机断层扫描（XCT）用于定量表征烧结玻璃压块在其初始阶段的局部相对密度波动。考虑到粗糙度参数，计算出微结构的不均匀度。在代表体积元素（RVE）中扫描23,500个粒子的基础上，将局部环境细分为三组不同的粒子，以立方单元表示，其体积相当于大约600、80和10个球形粒子的体积，直径80μm。独立于所分析的粒子组，我们发现可以由正态分布函数描述的局部相对密度分布的最大值始终出现在RVE的相对密度附近。但是，数据的波动显示出宽度方面的显着变化，随着所分析的粒子组的体积减小，该变化会增加，这表明粒子堆积在小范围内更加不均匀。特别是，我们观察到所考虑的RVE的微观结构的异质性在大约10到80个颗粒的组中变得明显。