Infiltration of Glass Melts into Fully Dense Al2O3 and MgO Ceramics
Infiltration of Glass Melts into Fully Dense Al2O3 and MgO Ceramics
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DOI：
10.1111/j.1151-2916.1998.tb02315.x
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发表时间：
2005-01
影响因子：
3.9
通讯作者：
Jeong-Joo Kim;M. Harmer
中科院分区：
文献类型：
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作者：
Jeong-Joo Kim;M. Harmer
研究了玻璃熔体向全致密Al 2 O3和MgO陶瓷中的渗透，重点阐明了渗透机理以及渗透过程中固体颗粒形状和尺寸的变化。对于Al 2 O3，由Ca-Al-Si-O玻璃熔体渗透，晶粒发展成棱柱形，与界面反应控制的晶粒生长一致。对于MgO，由Ca-MgSi-O玻璃熔体穿透，晶粒保持与扩散控制的晶粒生长一致的球形形状。当玻璃渗透到致密的多晶氧化铝样品中时，它导致液相在整个样品中均匀分布和均匀的晶粒尺寸。与此相反，当玻璃渗透的氧化镁试样，在表面区域（这是在与熔体直接接触）的液相的体积分数高于在中心区域。此外，平均晶粒尺寸较大的中心，玻璃的体积分数较低。这种显微组织的不均匀性即使在长时间的退火处理后也没有得到纠正。这种行为的原因进行了讨论。
The infiltration of glass melts into fully dense Al 2 O 3 and MgO ceramics has been studied with emphasis on elucidating the penetration mechanism and the change in shape and size of the solid grains that accompany the penetration process. For Al 2 O 3 , penetrated by a Ca-Al-Si-O glass melt, the grains developed a prismatic shape consistent with interface-reaction-controlled grain growth. For MgO, penetrated by a Ca-MgSi-O glass melt, the grains maintained a spherical shape consistent with diffusion-controlled grain growth. When glass penetrated into the dense polycrystalline alumina specimen, it resulted in a homogeneous distribution of liquid phase and a uniform grain size throughout the whole specimen. In contrast, when glass penetrated the magnesia specimen, the volume fraction of liquid phase at the surface region (which was in direct contact with the melt) was higher than that in the center region. Furthermore, the average grain size was larger in the center, where the volume fraction of glass was lower. This microstructural inhomogeneity stayed uncorrected even after prolonged annealing treatments. Reasons for this behavior are discussed.