NUST MISIS presentation of aluminum matrix composites

Innovative Technology for High-strength Aluminum Composites for Aerospace Industry developed at NUST MISIS

Materials scientists from National University of Science and Technology MISIS have presented a new technology for producing the aluminum matrix composites from the new raw materials — promising composite powders for 3D printing of light and durable cases for aircraft and automotive engineering. The new method increases the uniformity of properties and hardness of the obtained 3D printed composites by 40% in comparison with analogous. The results have been published in the international scientific journal Journal of Alloys and Compounds.

 

Aluminum matrix composites

Aluminum matrix composites are a group of advanced materials with several unique advantages: they are lightweight, have high strength, low thermal expansion coefficient and excellent wear resistance. Therefore, these materials can be used for the automotive, aerospace and defense industries.

The material has such properties due to its chemical composition and a special method of production — 3D printing using SLM (Selective Laser Melting) technology. As a result, the composite consists of spherical aluminum particles hardened with ceramic additives or coated with a layer of aluminum oxide.

New technology for aluminum matrix compositesAlumina is one of the most optimal reinforcement (hardening) additives, and it uses into the composition to improve the mechanical properties of aluminum composites. In particular, the authors of the study experimentally proved an increase in the strength of the printed composite material due to aluminum oxide by 40 % compared to aluminum without additives. Thus, alumina provides a higher heat resistance of the composite powder at elevated temperatures. It also increases the stability of the powder composition compared with the most common ceramic additives, which makes the material especially useful for aircraft construction.

 

The new technology

Scientists from NUST MISIS have developed a new method of hydrothermal oxidation of aluminum to create a reinforcement (hardening) oxide film of a certain thickness on the surface of aluminum particles. In the other words, on the surface of each spherical particle of pure aluminum, a “package” is formed — a layer of aluminum oxide of a certain thickness. The obtained aluminum composite in its characteristics is suitable for use in advanced additive manufacturing (SLM technology).

This technology is based on the so-called in-situ method, meaning the creation of a composite structure within each particle,” said Alexander Gromov, head of the project, professor at NUST MISIS. “The initial aluminum powder (with 99.85% purity) has been subjected to partial hydrothermal oxidation in an autoclave for 30 minutes. As a result, an oxide layer with 10 and 20% of Al2O3 content has been formed on the surface of aluminum powder particles. In the final phase, the powder has been heated in the modes from 150 to 600 degrees Celsius.”

 

Achieving a better uniformity of properties

The new technology at NUST MISIS

The main advantage of the method is the high activity of the obtained powder particles and the uniformity of their properties in the whole mass, which cannot be achieved using alternative methods for producing aluminum matrix composites, in particular — introducing ceramic fillers into molten aluminum.

Currently, the team has begun testing the obtained composites in the conditions of additive manufacturing.

Source: NUST MISIS

 


Leggi anche

Con l’obiettivo di promuovere l’adozione di tecnologie verdi nel settore aeronautico, riducendo conseguentemente, le emissioni di carbonio. La NASA ha deciso di stanziare cinquanta milioni di dollari per finanziare quattordici organizzazioni che si occuperanno dello sviluppo di processi di produzione e materiali compositi avanzati per le strutture degli aerei…

Leggi tutto…

Il Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM di Stade (Germania) sta sperimentando nuovi materiali e soluzioni di automazione per produrre velivoli più leggeri ed efficienti. Queste tecnologie rappresentano un passo decisivo sulla strada della sostenibilità, dato che ogni chilogrammo di peso risparmiato in un aereo passeggeri comporta una diminuzione del consumo di cherosene fino a 120 kg all’anno….

Leggi tutto…

La supply chain dell’Additive Manufacturing in scena dal 28 al 29 settembre 2023 nella cornice del Museo Alfa Romeo per la XI edizione del Convegno/Exhibition RM FORUM…

Leggi tutto…

Plataine, fornitore di soluzioni di AI e Industrial IIoT per l’ottimizzazione della produzione, ha intrapreso una collaborazione con l’Advanced Technologies Lab for Aerospace Systems (ATLAS), parte del National Institute for Aviation Research (NIAR) della Wichita State University, per esplorare le possibilità di evoluzione digitale dei processi di produzione di compositi avanzati, grazie all’analisi dei dati….

Leggi tutto…

Un consorzio composto dalle PMI ÉireComposites e Plasma Bound e dall’Università tecnologica di Dublino ha ottenuto un finanziamento governativo di 2,5 milioni di euro per il progetto Ad Astra, che ha l’obiettivo di promuovere l’adozione di materiali compositi leggeri in diverse fasi del processo produttivo dell’industria aerospaziale. Il lavoro sarà sostenuto nell’ambito del DTIF (DISRUPTIVE TECHNOLOGIES INNOVATION FUND) Call 5, guidato dal governo irlandese e da Enterprise Ireland….

Leggi tutto…