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Plasma Spraying of Kaolinite for Preparing Reactive Alumino‐Silicate Glass Coatings
- Thermally treated kaolinite is used to develop a range of alumino‐silicate‐based precursor materials but its behavior during plasma spraying has not been well‐researched. In this study, two types of kaolinite samples were investigated in the form of low defect (KGa‐1b) and high defect (KGa‐2) varieties. The extreme temperatures of the plasma stream (up to 20 000 K) induced flash melting to produce a highly porous alumino‐silicate glass without any crystallization of new Al−Si oxide minerals. The glass is comprised largely of intact or deformed spheres (average diameters 1.14–1.44 μm), which indicates rapid quenching and solidification before impact. The subspherical structures contain up to 40 % closed pore space caused by the rapid escape of water during melting. The low‐density, porous alumino‐silicate glass coatings with predicted specific surface areas (>0.95 m2/g) and hardnesses >1.8 GPa represent a potentially reactive but physically stable substrate ideal for further chemical functionalization.
Author: | Laurence N. Warr, Thorben Wolff, Holger Testrich, Georg Grathoff, Angela Kruth, Rüdiger Foest |
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URN: | urn:nbn:de:gbv:9-opus-83077 |
DOI: | https://doi.org/10.1002/slct.202202820 |
ISSN: | 2365-6549 |
Parent Title (English): | ChemistrySelect |
Publisher: | Wiley |
Place of publication: | Hoboken, NJ |
Document Type: | Article |
Language: | English |
Date of first Publication: | 2022/12/15 |
Release Date: | 2024/02/26 |
Tag: | Alumino-silicate glass; Highly porous structure; Kaolinite melting; Plasma spraying; Reactive thin films |
Volume: | 7 |
Issue: | 47 |
Article Number: | e202202820 |
Page Number: | 10 |
Faculties: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geographie und Geologie |
Collections: | weitere DFG-förderfähige Artikel |
Licence (German): | Creative Commons - Namensnennung 4.0 International |