当前的高速烧结和高速烧结协议损害了 yttria 稳定的半透明度,但没有强度
Abdulaziz M Alshahrani1, Chek Hai Lim2, Mark S Wolff3
1Laboratories for Microstructure Physics & Mechanics of Materials, Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia.
概括
与传统方法相比,易特里亚稳定 (YSZ) 的快速和高速烧结会产生类似的强度,但密度和半透明度较低. 这些发现对于优化牙科和工业应用中YSZ加工至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 陶工程 陶工程 陶工程
- 生物材料是一种生物材料.
背景情况:
- 伊特里亚稳定 (YSZ) 是一种广泛使用的陶材料,以其出色的机械性能而闻名.
- 优化烧结工艺对于实现所需的材料特性,如密度,微观结构和机械强度至关重要.
- 传统的烧结虽然有效,但可能耗时.
研究的目的:
- 评估传统,速度和高速烧结对3YSZ,4YSZ和5YSZ粉末的密度,微观结构,相组合,半透明度和屈曲强度的影响.
- 为了比较不同烧结协议的结果,以确定加工时间和材料特性之间的权衡.
主要方法:
- 从三个不同的YSZ粉末 (3YSZ,4YSZ,5YSZ) 制备162个圆盘形样本.
- 使用常规 (∼12小时),速度 (∼2860分钟) 和高速 (∼18分钟) 协议的样品烧结.
- 使用已确定的分析技术 (阿基米德,SEM,XRD,光谱,3球上的活塞) 评估密度,微观结构,相位含量,半透明度和双轴屈曲强度.
主要成果:
- 传统的烧结实现了最高密度,其次是速度,然后是所有YSZ组合的高速烧结.
- 所有的烧结方法都产生了类似的屈曲强度值.
- 与传统烧结相比,速度和高速烧结导致透明度明显降低.
- 微结构分析显示,高速烧结时的颗粒大小较小,而5YSZ高速烧结时的颗粒大小最大.
结论:
- 与传统烧结相比,YSZ的快速和高速烧结可以减少加工时间,但导致密度和半透明度降低.
- 虽然在不同的烧结速度上,屈曲强度仍然可比,但权衡涉及到光学性能降低和密集化.
- 这些发现为选择合适的烧结策略提供了宝贵的见解,基于特定应用所需的YSZ材料特性.
相关概念视频
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
01:29Imperfections in Crystal Structure: Non-Stoichiometric Defects
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
01:25Deleterious Substances in Aggregate
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
Another type of impurity is clay and fine material that...