Process for producing a thermal barrier in a multilayer system for protecting a metal part and part equipped with such a protective system
US10851667B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 13, 2018 |
| Grant date | Dec 1, 2020 |
| Priority date | — |
| Expiry date | Jul 11, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12549
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The object of the present invention is to produce a metal part equipped with a protection system, particularly for turbine blades for aircraft engines, having a thermal barrier that is improved in terms of thermal properties, adhesion to the part and resistance to oxidation/corrosion. In order to achieve this, the method according to the invention produces in a single step, from specific ceramics, coating layers using SPS technology.According to one embodiment, a metal part is produced according to an SPS flash sintering method and comprises a superalloy substrate (22), a metal sub-layer (21), a TGO oxide layer (25) and the thermal barrier (23) formed by said method from at least two chemically and thermally compatible ceramic layers (2a, 2b).A first ceramic (2a), referred to as the inner ceramic, is designed to have a substantially higher expansion coefficient. The outer ceramic (2b) is designed to have at least lower thermal conductivity, and a sintering temperature and/or maximum operating temperature that is substantially higher. The thermal barrier (23) has a composition and porosity gradient (3) from the metal sub-layer (21) to the outer ceramic (2b).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.