H2020Индивидуална стипендия2020–2022

REALMAX · Replenishing the limited Aluminium reservoir of MAX phase coatings in harsh environments

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2020-08-17 → 2022-08-16
Финансиране от ЕС: 162 806 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

MAX фазите са керамични материали, които се изследват за по-добра устойчивост на високи температури, например чрез предотвратяване на разпадането на Cr2AlC при окисляване. Подобрението на тези свойства удължава живота на компоненти в газови турбини и соларни енергийни системи.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Replenishing the limited Aluminium reservoir of MAX phase coatings in harsh environments

MAX phases constitute a family of layered ceramics exhibiting a unique combination of ceramic and metallic properties. These materials have attracted significant attention because they are promising candidates for applications that require resistance to harsh environments, such as high temperatures and oxidizing/corrosive environments. In fact, MAX phases are particularly interesting because of their self-protecting capabilities, which result from the weakly bonded A-elements of the MAX phase. For example, in the case of high-temperature oxidation of the Cr2AlC MAX phase, the crystallographic structure of the MAX phase allows for the Al to diffuse out of the structure, react with the oxidizing surroundings and form a protective aluminium oxide scale at the surface. While leading to the protection of the MAX phase, the depletion in Al also causes local decomposition, of the MAX phase into binary carbides, in the vicinity of the newly formed oxide scale. The decomposition is often accompanied by the formation of pores as the exposure to the oxidizing environment continues leading to the catastrophic failure of the MAX phase component. The production of high-temperature materials able to withstand extreme environments is crucial for the energy transition. By improving the thermal stability and the oxidation/corrosion resistance of such materials, the lifetime of components is increased. Furthermore, MAX phases are self-healing materials and therefore damage tolerant. Aside from sustainable impact, MAX phases can also improve the performance of for example gas turbines for aerospace and concentrated solar power systems. The REALMAX project dealt with improving the high-temperature oxidation resistance of the Cr2AlC MAX phase by employing different strategies. First, compositional design was considered in order to prevent excessive Al-consumption. Second, microstructural design was implemented in order to decrease the direct diffusion paths for either O or Al ion diffusion. Finally, the possibility of continuously supplying Al to a MAX phase coating was implemented.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Phase stability is likely to be the single most important specification which determines the lifetime of materials operating in extreme environments. Whether a phase will react with the environment or decompose at high temperature is an essential limitation for the use of the material for any given applications. MAX phases are a family of layered ternary ceramics currently being developed for extreme environment applications because of their tolerance to heat, their ceramic-metallic hybrid properties and more importantly because of their self-healing behaviour. However, similarly to other self-healing materials, aluminium-based MAX phases tend to decompose locally as soon as Al reacts to form the protective oxide scale. Upon decomposition, the unique set of properties deteriorates rapidly.The REALMAX project will tackle the outward diffusion of Al from MAX phase coatings in oxidising environments, by providing solutions for supplying Al to the coating from a MAX phase substrate which will act as Al-reservoir. Furthermore, the REALMAX project will engage in ground-breaking research to develop multifunctional coatings and validate the concept of “high-entropy” MAX phases. In fact, these multielement MAX phases constitute a new and exciting research line which is in the early stages of being developed.The REALMAX project will be carried out by the experienced researcher (ER) who has gained experience on MAX phase coatings during her current postdoctoral position. The ER has aligned a team of experts in MAX phases, coatings and material processing who will collaborate to offer innovative solutions to increase phase stability in MAX phase systems while mentoring her to achieve her career plans. In fact, she will be well positioned to pursue her academic career in Europe, while simultaneously adding genuinely novel expertise approaches to the research environment and the group she will be joining. Therefore, the mutual benefit and impact of this proposal is extensive.

Оригинален текст от CORDIS (на английски).

Участници

RHEINISCH-WESTFAELISCHE TECHNISCHE HOCHSCHULE AACHEN · AachenКоординаторГермания