Abstract
High-temperature barrier coatings protect metals and alloys from oxidization, delay property degradation and increase their service lifetime. Here we demonstrate a vermiculite clay-based oxidation-resistant coating on metal, using copper as an example. Dispersions of few-layer vermiculite sheets with lateral dimension in the range of microns to tens of microns are obtained in a two-step mechanical-chemical exfoliation approach, using vermiculite mineral as the starting material. The dispersion of these high aspect ratio two-dimensional sheets can be directly spray-coated on Cu foils to form a continuous and transparent thermal barrier film without the need for any binder materials. After heating in air at 400 °C for 24 h, vermiculite protected Cu foils did not show any significant sign of oxidation or degradation in mechanical and electrical properties, while uncoated Cu foils were completely destroyed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 4658-4663 |
| Number of pages | 6 |
| Journal | Materials Chemistry Frontiers |
| Volume | 5 |
| Issue number | 12 |
| DOIs | |
| State | Published - Jun 21 2021 |
Funding
L. L. thanks the China Scholarship Council for a fellowship to support her earlier two-year visit to Northwestern University when pursuing her PhD at Soochow University. J. H. thanks the support from the Robert R. McCormick School of Engineering and Applied Science at Northwestern and an earlier gift donation from the Sony Corporation. The work made use of the EPIC and SPID facility of Northwestern University’s NUANCE Center, which has received support from the SHyNE Resource (NSF ECCS 2025633), the IIN and Northwestern’s MRSEC program (NSF DMR-1720139). The authors thank Drs. Kevin Chiou and Chenlong Cui for the helpful discussion and technical assistance.
ASJC Scopus subject areas
- General Materials Science
- Materials Chemistry