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Effects of the Molding Method and Blank Size of Green Body on the Sintering Densification of Magnesia

机译：生坯的成型方法和生坯尺寸对氧化镁烧结致密化的影响

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摘要

The bulk density of sintered magnesia is significantly influenced by molding methodology and blank size of the green body during dry pressing. The entrapped air in the green body plays a critical role in determining the bulk density of magnesia samples. Herein, high-density magnesia samples, with different sizes, are prepared by using vacuum compaction molding and conventional compaction molding. The physical properties, such as bulk density and pore size distribution, and morphology or as-sintered magnesia samples were characterized by using Archimedes method, mercury porosimetry, and scanning electron microscopy (SEM). The results indicate that the bulk density of conventional compaction magnesia samples decreased below 3.40 g·cm−3 with the increase of thickness due to the presence of entrapped-air induced large pores and intergranular cracks. In addition, the large pores and intergranular cracks in conventionally-compacted samples are observed by SEM images. However, vacuum compaction of magnesia samples resulted in a bulk density of higher than 3.40 g·cm−3 for all thicknesses. Moreover, the defects in vacuum-compacted magnesia samples are mainly in the form of small circular pores.
机译：烧结氧化镁的堆积密度受成型方法和干压过程中生坯毛坯尺寸的影响很大。生坯中夹带的空气在确定氧化镁样品的堆积密度中起着至关重要的作用。在此，通过使用真空压制成型和常规的压制成型来制备具有不同尺寸的高密度氧化镁样品。通过使用阿基米德法，水银孔隙率法和扫描电子显微镜（SEM）表征了诸如堆积密度和孔径分布以及形态或烧结氧化镁样品的物理性质。结果表明，常规压制氧化镁样品的堆密度随厚度的增加而降低到3.40 g·cm −3 以下，这是由于夹杂空气引起的大孔和晶间裂纹的存在。另外，通过SEM图像观察了常规压实样品中的大孔和晶间裂纹。然而，氧化镁样品的真空压实导致所有厚度的堆积密度都高于3.40 g·cm -3 。此外，真空压制氧化镁样品中的缺陷主要表现为小圆形孔的形式。

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