Russian scientists develop technology for production of transparent aluminium

July 18, 2017

Russian scientists develop technology for production of transparent aluminium

A scientist at work at the National Research Nuclear University MEPhI in Russia (Courtesy National Research Nuclear University)

 

Scientists from the National Research Nuclear University (MEPhI), Moscow, Russia, have developed a technology to produce compacts from aluminium oxynitride (Al23O27N5), or ‘transparent aluminium’, reports Phys.org. The method incorporates the use of spark-plasma sintering in a process based on the modified method of hot pressing.

In this case, electric current is passed directly through the mould and pressing billet. Researchers at the Institute of nuclear physics and engineering (INPhE) MEPhI reported that rapid heating is achieved by the pulsed current, resulting in an extremely short work-cycle time.

According to a paper published by MEPhl’s researchers, spark-plasma sintering was conducted in a LABOX machine model 625 (produced by Sinter Land, Japan). The sintering procedure used was standard, using a graphite matrix with an additional layer of graphite paper between the matrix and the powder filling, and between the graphite punches and the powder to prevent the latter and the equipment from sintering. 

The primary use for transparent aluminium is currently the development of high strength armour and protective structures used by the armed forces and police, as the penetrative power of small arms and small-caliber artillery continues to increase. Currently, sapphire is often used to create materials for military armour. However, its use may be cost-prohibitive for some military organisations. According to MEPhl’s scientists, transparent polycrystalline ceramics provide a promising solution to the need for increased protection against ammunition and artillery, including ceramics based on aluminium oxynitride. 

The use of transparent materials for armour is becoming more important as military organisations increase their dependence on UV, visible and infrared optical sensors. Different sensors ‘see’ different wavelengths of light: For example, infrared is important for heat-seeking capabilities, while UV imaging can be used to detect threats not seen in the visible spectrum.

In addition to its strength, transparent aluminium can can withstand temperatures of up to 2100°C. This means that transparent aluminium-based armouring may also be used to produce windows and domes for spacecraft, which encounter high temperatures and gravitational forces as they exit and enter Earth’s atmosphere.

eng.mephi.ru

In the latest issue of PM Review…

Download PDF

Extensive Powder Metallurgy industry news coverage, and the following exclusive deep-dive articles and reports:

  • Burgess-Norton and Amsted Automotive: How a legacy automotive supplier is growing with, not despite, electrification
  • Meeting sustainability demands in PM: High-temperature sintering of nickel- and copper-free powder mixtures for low alloyed PM parts
  • World PM2022: An overview of the status and trends in the global PM industry
  • A novel approach for the production of metal powders with tailored chemical compositions: Amazemet’s rePowder
  • Productivity, flexibility, reliability: SACMI’s new press technologies for the changing PM industry
  • Understanding the thermal properties of metal powders: Characterisation of powders using the Hot Disk technique
  • World PM2022: Views on the potential of Field Assisted Sintering for advanced materials

The latest news from the world of metal powders, delivered to your inbox

Don't miss any new issue of PM Review, and get the latest industry news. Sign up to our weekly newsletter.

Sign up

From the industry…

Discover our magazine archive…

The free-to-access PM Review magazine archive offers unparalleled insight into the world of Powder Metallurgy from a commercial and technological perspective through:

  • Reports on visits to leading PM part manufacturers, metal powder manufacturers and industry suppliers
  • Articles on technology and application trends
  • Information on materials developments
  • Reviews of key technical presentations from the international conference circuit
  • International industry news

All past issues are available to download as free PDFs or view in your browser.

 

Browse the archive

 

Looking for PM production equipment, metal powders, R&D support and more?

Discover suppliers of these and more in our
advertisers’ index and buyer’s guide, available in the back of PM Review magazine.

  • Powders & materials
  • Powder process, classification & analysis
  • PM products
  • Atomisers & powder production technology
  • Compaction presses, tooling & ancillaries
  • Sintering equipment & ancillaries
  • Post-processing
  • Consulting & toll sintering
Download PDF
Share via
Copy link