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首页> 外文期刊>Ceramic Engineering and Science Proceedings >EFFECTS OF MICROSTRUCTURAL ANISOTROPY ON FRACTURE BEHAVIOR OF HEAT-PRESSED GLASS-CERAMICS AND GLASS-INFILTRATED ALUMINA COMPOSITES FOR DENTAL RESTORATIONS
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EFFECTS OF MICROSTRUCTURAL ANISOTROPY ON FRACTURE BEHAVIOR OF HEAT-PRESSED GLASS-CERAMICS AND GLASS-INFILTRATED ALUMINA COMPOSITES FOR DENTAL RESTORATIONS

机译：微观结构各向异性对热修复玻璃陶瓷和玻璃渗透氧化铝复合材料修复牙齿断裂行为的影响

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摘要

The effects of microstructural anisotropy associated with sample geometry on fracture behavior were investigated for three dental ceramics (glass-ceramic reinforced by near-isometric leucite particles, Empress - El, glass-ceramic reinforced by elongated lithium disilicate particles, Empress 2 -E2, and glass-infiltrated alumina composite, In-Ceram Alumina - IC). The glass-ceramic samples were prepared by the heat-pressing method and the IC samples were prepared by infiltration of a La{sub}2O{sub}3 based glass into a skeleton of pre-sintered alumina platelets. The samples were prepared with bar and disc geometries. The material with near-isometric particles (El) had an isotropic microstructure and K{sub}(lc) values were statistically similar for both sample geometries. The materials with particles with high aspect ratios (E2 and IC) had anisotropic microstructures and K{sub}(Ic) values of the samples with the bar geometry were significantly higher than the samples with the disc geometry, because of the reinforcement caused by particle alignment along the direction of longer axis of the bar. For sample E2, the heat-pressing method caused particle alignment along the direction perpendicular to the direction of injection in disc specimens, which resulted in relatively low biaxial flexural strength caused by the formation of weak paths in the glassy matrix for crack propagation. For evaluation of the strength of materials which tend to exhibit microstructural anisotropy caused by processing variables, the biaxial flexural test is recommended over uniaxial bending, since it allows for crack propagation by weakest microstructural path.
机译：研究了三种牙科陶瓷的微结构各向异性与样品几何形状对断裂行为的影响（由近等距的白云母颗粒增强的玻璃陶瓷，Empress-El，细长的二硅酸锂颗粒增强的玻璃陶瓷，Empress 2 -E2和玻璃渗透氧化铝复合材料，陶瓷内氧化铝-IC）。通过热压法制备玻璃陶瓷样品，并通过使基于La {sub} 2O {sub} 3的玻璃渗透到预烧结的氧化铝片的骨架中来制备IC样品。样品具有棒形和盘形几何形状。具有接近等距的颗粒（El）的材料具有各向同性的微观结构，两种样品的几何形状K {sub}（lc）值在统计上相似。具有高深宽比（E2和IC）的颗粒的材料具有各向异性的微观结构，棒形几何形状的样品的K {sub}（Ic）值明显高于盘形几何形状的样品，这是由于颗粒引起的增强沿钢筋的长轴方向对齐。对于样品E2，热压法导致颗粒在圆盘样品中沿垂直于注入方向的方向排列，这导致相对较低的双轴抗弯强度，这是由于在玻璃状基质中形成较弱的裂纹扩展路径所致。为了评估趋于表现出由加工变量引起的微观结构各向异性的材料的强度，建议在单轴弯曲上进行双轴弯曲试验，因为它允许通过最弱的微结构路径传播裂纹。

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