Next Article in Journal
Applying Machine Learning to Nanoindentation Data of (Nano-) Enhanced Composites
Previous Article in Journal
Structural Features, Modification, and Functionalities of Beta-Glucan
Previous Article in Special Issue
An Aging Evaluation of the Bearing Performances of Glass Fiber Composite Laminate in Salt Spray Fog Environment
Open AccessArticle

Dissolution and Diffusion-Based Reactions within YBa2Cu3O7−x Glass Fibers

1
Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA 24061, USA
2
Center for Photonics Technology, The Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA 24061, USA
3
Department of Chemistry, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA 24061, USA
*
Author to whom correspondence should be addressed.
Fibers 2020, 8(1), 2; https://doi.org/10.3390/fib8010002
Received: 4 October 2019 / Revised: 4 December 2019 / Accepted: 10 December 2019 / Published: 20 December 2019
(This article belongs to the Special Issue Advances in Glass Fibers)
This work presents a thorough identification and analysis of the dissolution and diffusion-based reaction processes that occur during the drawing of YBa2Cu3O7−x (YBCO) glass-clad fibers, using the molten-core approach, on a fiber draw tower in vacuum and in oxygen atmospheres. The results identify the dissolution of the fused silica cladding and the subsequent diffusion of silicon and oxygen into the molten YBCO core. This leads to a phase separation due to a miscibility gap which occurs in the YBCO–SiO2 system. Due to this phase separation, silica-rich precipitations form upon quenching. XRD analyses reveal that the core of the vacuum as-drawn YBCO fiber is amorphous. Heat-treatments of the vacuum as-drawn fibers in the 800–1200 °C range show that cuprite crystallizes out of the amorphous matrix by 800 °C, followed by cristobalite by 900 °C. Heat-treatments at 1100 °C and 1200 °C lead to the formation of barium copper and yttrium barium silicates. These results provide a fundamental understanding of phase relations in the YBCO–SiO2 glass-clad system as well as indispensable insights covering general glass-clad fibers drawn using the molten-core approach. View Full-Text
Keywords: YBCO–SiO2 phase relations; ceramic core glass fibers; glass fiber drawing; dissolution of fused silica YBCO–SiO2 phase relations; ceramic core glass fibers; glass fiber drawing; dissolution of fused silica
Show Figures

Figure 1

MDPI and ACS Style

Heyl, H.; Yang, S.; Homa, D.; Slebodnick, C.; Wang, A.; Pickrell, G. Dissolution and Diffusion-Based Reactions within YBa2Cu3O7−x Glass Fibers. Fibers 2020, 8, 2.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop