Wave-absorbing material powder with oxidation resistance and salt fog resistance and preparation method thereof
US12091750B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2022 |
| Grant date | Sep 17, 2024 |
| Priority date | — |
| Expiry date | Dec 24, 2042 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/10
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Wave-absorbing material powder of the present invention has oxidation resistance and salt fog resistance, which includes an iron-containing wave-absorbing material powder, and a metal oxide ceramic layer and a metal phosphate layer sequentially coated on an outside of the iron-containing wave-absorbing material powder from the inside to the outside. A method for preparing the wave-absorbing material powder includes using atomic layer deposition to coat the iron-containing wave absorbing material powder with a metal oxide ceramic coating, and then adopting the atomic layer deposition to coat the metal oxide ceramic coating with a metal phosphate layer; repeating the above steps to form an alternating nano-stack of the metal oxide ceramic coating and the metal phosphate layer outside the iron-containing absorbing material powder; and finally performing a high-temperature annealing treatment. The present invention improves temperature resistance, corrosion resistance and oxidation resistance of wave-absorbing materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.