Functionally graded alumina-based thin film systems
US7096921B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 2005 |
| Grant date | Aug 29, 2006 |
| Priority date | — |
| Expiry date | May 23, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C3/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides coating systems that minimize thermal and residual stresses to create a fatigue- and soldering-resistant coating for aluminum die casting dies. The coating systems include at least three layers. The outer layer is an alumina- or boro-carbide-based outer layer that has superior non-wettability characteristics with molten aluminum coupled with oxidation and wear resistance. A functionally-graded intermediate layer or “interlayer” enhances the erosive wear, toughness, and corrosion resistance of the die. A thin adhesion layer of reactive metal is used between the die substrate and the interlayer to increase adhesion of the coating system to the die surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.