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Surface-initiated microstructure formation in glass ceramics

玻璃陶瓷中表面引发的微观结构形成

基本信息

批准号：
382920141
负责人：
Dr. Christian Patzig
金额：
--
依托单位：
Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen (IMWS)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/382920141?language=en
关键词：
Surface initiated microstructure formation glass

项目摘要

Up to now, the mechanisms of surface nucleation and surface-induced texture formation are far from being understood. Corresponding phenomena are discussed hypothetically or even controversial, and related studies are restricted to very few glasses. As a main drawback, the vast majority of previous works on oriented growth of surface crystals do not consider the possible effects of glass surface treatments (like polishing defects, oradhered particles and cracks) or ambient annealing conditions (vacuum or atmospheric pressure), which both can influence crystal nucleation and growth. Moreover, very few observations of crystal orientation related to surface crystallization were focused on separately growing crystals. In conclusion, up to now, no systematic studies on initially oriented crystal growth or nucleation from defined active nucleation sites have been pursued.Therefore, the main objective of the proposed project is to gain a basic understanding of the mechanisms of surface-induced microstructure formation in glass ceramics. We shall answer the question whether preferred orientation of surface crystals is the result of oriented nucleation, or caused by other orientation selection mechanisms acting during early crystal growth. In both cases, crystal orientation may be caused by the orientation of the glass surface itself or the anisotropy and orientation of active surface nucleation defects. New techniques of experimental characterization of surface-crystallized glasses shall be applied to find answers to the questions posed above. Based on a controlled preparation and annealing of the glass sample surfaces, that includes the defined creation of active nucleation defects, and followed by the microstructural characterization especially during the very early growth stages of separated surface crystals, the orientation relations between defect and initiated surface crystal will be analyzed. In order to gain new insights, a couple of entirely new microstructure diagnostics techniques, including chemically contrasted XRM, laser-based sample preparation for XRM, and 3D electron backscatter diffraction shall be developed or applied.This way, using X-ray microscopy as a pivotal technique for the non-destructive 3D characterization of relatively large samples at superior spatial resolution (but also complemented by other microstructure diagnostics techniques, e.g. transmission electron microscopy based elemental mappings at cross-sectioned samples), unprecedented insights into the microstructure evolution upon surface crystallization of model glasses will be gained.

到目前为止，表面形核和表面诱导织构形成的机制还远未被理解。相应的现象被假设性地讨论，甚至是有争议的，相关的研究仅限于极少数的眼镜。作为一个主要的缺点，绝大多数以前的工作定向生长的表面晶体不考虑玻璃表面处理（如抛光缺陷，或粘附的颗粒和裂纹）或环境退火条件（真空或大气压力），这两者都可以影响晶体成核和生长的可能影响。此外，很少观察到的晶体取向有关的表面结晶集中在单独生长的晶体。总之，到目前为止，还没有系统的研究初始取向的晶体生长或成核从定义的活性nucleationsites已经purchased.So，拟议的项目的主要目标是获得一个基本的了解的机制，表面诱导的微结构形成的玻璃陶瓷。我们将回答这样一个问题，即表面晶体的择优取向是定向成核的结果，还是由早期晶体生长过程中的其他取向选择机制引起的。在这两种情况下，晶体取向可能是由玻璃表面本身的取向或活性表面成核缺陷的各向异性和取向引起的。表面结晶玻璃的实验表征的新技术将被应用于寻找上述问题的答案。基于玻璃样品表面的受控制备和退火，包括定义的活性成核缺陷的产生，以及随后的显微结构表征，特别是在分离的表面晶体的非常早期的生长阶段期间，将分析缺陷和引发的表面晶体之间的取向关系。为了获得新的见解，将开发或应用一些全新的微结构诊断技术，包括化学对比XRM、用于XRM的基于激光的样品制备和3D电子背散射衍射。使用X射线显微镜作为以上级空间分辨率对相对较大的样品进行非破坏性3D表征的关键技术（但也辅之以其他微结构诊断技术，例如基于横截面样品的元素映射的透射电子显微镜），将获得对模型玻璃的表面结晶后的微结构演变的前所未有的洞察。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Sample preparation for analytical scanning electron microscopy using initial notch sectioning.

使用初始切口切片进行分析扫描电子显微镜样品制备

DOI：
10.1016/j.micron.2021.103090
发表时间：
2021
期刊：
Micron
影响因子：
2.4
作者：
R. Busch;C. Tielemann;S. Reinsch;R. Müller;C. Patzig;M. Krause;Th. Höche
通讯作者：
Th. Höche

Generalised kinetics of overall phase transition useful for glass crystallisation when assuming non-isothermal conditions

假设非等温条件下，对玻璃结晶有用的整体相变的广义动力学

DOI：
10.13036/17533562.61.6.006
发表时间：
2020
期刊：
Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B
影响因子：
0
作者：
I. Avramov;J. Sestak
通讯作者：
J. Sestak

Oriented surface nucleation in diopside glass